- Type of paper
: Book
Title: -Prevention of Formation Damage Caused by Borehole Fluids,
Part 1
- Authors:
- Steiner, Ivo (44756)
- Boškov-Steiner, Zagorka (106632)
- ćelap, Stojan
- Gaurina-Međimurec, Nediljka (98545)
- Goričnik, Bogdan (72195)
- Juttner, Ivanka (16283)
- Krilov, Zoran (142621)
- i drugi,
- Editors
- Steiner, Ivo (44756)
- Čabrajac, Stevo
Publisher: Rudarsko-geološko-naftni fakultet Sveučilišta Institut za rudarstvo, geotehniku i naftu
Year: 1991
Number of pages: 115
Number of references: 140
Language: hrvatski
Summary: Formation damage of rocks surrounding boreholes productive
onoil, gas and/or water is a not wished, but very often and inmodern
drilling and workover unavoidable occurence. As aconsequence substantial
decrease of productuivity and lowerrecovery of valuable fluids occur. From
outcrops sandstonesamples were collected, their geological and physical
propertieswere tested and described. Testing instruments were designed
orprepared for necessary physical and chemical tests.
Keywords: Formation damage, sandstone, outcrop, geological description, physical and chemical analyses, testing instruments
Other: Sistematično istraživanje s uzorcima pješčenjaka iz izdanaka
i
s uzorkomiz jedne bušotine radi dobivanja podataka onajpovoljnijim
sastavima bušotinskih fluida u cilju izbjegavanjaili smanjenja oštećenja
propusnosti proizvodnih stijena.Zajedničko istraživanje skupine iz
INA-Naftaplina i skupine RGNfakulteta.
- Type of paper
: Book
Title: Prevention of Formation Damage Caused by Borehole Fluids,
Part 2
- Authors:
- Steiner, Ivo (44756)
- Boškov-Steiner, Zagorka (106632)
- ćelap, Stojan
- Gaurina-Međimurec, Nediljka (98545)
- Goričnik, Bogdan (72195)
- Juttner, Ivanka (16283)
- Krilov, Zoran (142621)
- Martinko, Božidar (150256)
- Sorić, Tomislav
- Šarc-Lahodny, Olga (46003)
- i drugi,
- Editors
- Steiner, Ivo (44756)
- Krilov, Zoran (142621)
- Čabrajac, Stevo
Publisher: Rudarsko-geološko-naftni fakultet Sveučilišta Institut za rudarstvo, geotehniku i naftu
Year: 1991
Number of pages: 200
Number of references: 145
Language: hrvatski
Summary: Numerous tests were made with sandstone samples analysed
earlier.Mutual influence of rock samples with selected wellbore fluidshas
been tested. With typical steel samples and the same fluidscorrosivity of
the steel was tested and prevention ofcorrosiveness was established.
Conclusions were made on causes offormation damage and on ways of
prevention of it.
Keywords: borehole fluid, interaction rocks/fluids, steel corrosion, Types of formation damage
Other: Nastavak istraživanja iz prvog dijela Studije. Zaključci
okonkretnim mjerama za uklanjanje ili umanjivanje štetnih pojava
uproizvodnim bušotinama.
- Type of paper
: Book
Title: Technology of Horizontal Drilling
- Authors:
- Steiner, Ivo (44756)
- Boškov-Steiner, Zagorka (106632)
- Editors
- Štokalo, Vladimir
Publisher: Barbat
ISBN: 953-181-004-4
Year: 1994
Number of pages: 180
Number of references: 80
Language: hrvatski
Summary: Recent technology of horizontal drilling is shown through
geological conditions favourable for such drilling, through kinds and types
of such wells, through geometry of transition from vertical to horizontal
position and for that necessary tools. Further, systems for steering and
masurement are described, as well as pecularities of flushing such wells
and pecularities of casing design, cementing and completion of them.
Conditions for economic evaluation of purpusefulness of horizontal wells
are given too.
Keywords: horizontal drilling,geological circumstances,kinds and types of wells,MWD,LWD,well completion
- Type of paper
: Paper in book
Title: Corrosion Inhibition in Oil and Gas Drilling and
Production Operations
- Authors:
- Šarc-Lahodny, Olga (46003)
- Editors
- Costa, J.M.
- Mercer, A.D.
Publisher: The Institute of Materials, Sales & Marketing, Dept.1, Carlton House Terrace
ISBN: 0-901716-49-9
Year: 1993
Pages: from 0 to 0
Language: engleski
Summary: Some polyhzdroxilated compounds of vegetable origin, as
tannins, are known to promote the protection of rusted steel surface. Their
action has been explained by the formation of low soluble iron complexes
and by the conversion of rust to magnetite
Keywords: corrosion, inhibition, tannin, tannates, steel
- Type of paper
: Paper in book
Title: Corrosion Inhibition of Rusted Steel
- Authors:
- Šarc-Lahodny, Olga (46003)
- Orlović-Leko, Palma (164853)
- Žagar, Hrvojka
- Editors
- Costa, J.M.
- Mercer, A.D.
Publisher: The Institute of Materials, Sales & Marketing, Dept.1, Carlton House Terrace
Pages: from 0 to 0
Language: engleski
Summary: Some polyhydroxilated compounds of vegetable origin, as
tanins,are known to promote the protection of rusted steel surface.Their
action has been explained by the formation of low solubleiron complexes and
by the conversion of rust to magnetite.
Keywords: corrosion, inhibition, steel, tannin, tannates
- Type of paper
: Paper in book
Title: Tečajevi ljetne škole naftnog rudarstva u Dubrovniku
1987-1990
- Authors:
- Steiner, Ivo (44756)
- Editors
- Paar, Vladimir
- i drugi,
Publisher: Školska knjiga
ISBN: 953-0-61314-8
Year: 1995
Pages: from 42 to 45
Language: engleski
Summary: By cooperation of the Petroleum Engineering Department of
the Louisiana State University at Baton Rouge, LA, USA and the Faculty for
Mining, Geology and Petroleum Engineering of the University of Zagreb and
with financial support of the domestic oil and gas industry, nine courses
in duration of one week each have been held. Their content has covered
actual problems of oil and gas exploration and production as well as
pourposefull solution of these problems. Plentiful professional literature
has been prepared. On these courses had been between 22 and 40
participants.War events in and around Dubrovnik have enabled continuation
of Summer School activities.
Keywords: petroleum engineering, Summer school courses,professional education,transfer of technology
- Type of paper
: Paper in journal
Title: Projektiranje putanje vodoravnih bušotina
- Authors:
- Steiner, Ivo (44756)
Journal: Nafta, Zagreb
Number: 1
ISSN: 0027-755
Volume: 44
Year: 1993
Pages: from 31 to 34
Number of references: 5
Language: engleski
Summary: A way of designing well paths of horizontal wellbores
ispresented by application of simple geometric relations. Usingequations
listed in the paper vertical depths, lateral reachesand lengths of well
paths from the rig site to various key pointscan be calculated, as well as
average build-up rates and turningradiuses of curved well path sections. An
example makes it easierto understand the presented procedure.
Keywords: horizontal drilling, kick-off point, build-up rate, turning radius, tangent section, total vertical depth
- Type of paper
: Paper in journal
Title: Influence of Borehole Fluids on Sandstone Formation Damage
- Authors:
- Steiner, Ivo (44756)
- Krilov, Zoran (142621)
- Goričnik, Bogdan (72195)
- Martinko, Božidar (150256)
- Gaurina-Međimurec, Nediljka (98545)
Journal: Naftaplin, Zagreb
Number: 1
Volume: 14
Year: 1993
Pages: from 39 to 52
Number of references: 31
Language: hrvatski
Summary: The occurence of formation damage in oil, gas and/or
waterreservoir rocks can be encountered in all phases of
reservoirdevelopment and exploitation. The associated rock
permeabilityimpairment causes well productivity reduction and lower
thanexpected recoveries of valuable hydrocarbon. Samples of
outcropsandstone rocks were collected at six different locations inCroatia.
Also, subsurface sandstone cores were recovered from theproductive
intervals of Žutica oilfield.
Keywords: sandstone, permeability reduction (formation damage), chemical formation damage, mechanical formation damage, wellbore fluids, dynamic filtration test, X-Ray CT scanning, SEM photomicrography
- Type of paper
: Paper in journal
Title: Geološki pogledi na vodoravno bušenje
- Authors:
- Boškov-Steiner, Zagorka (106632)
- Steiner, Ivo (44756)
Journal: Rudarsko-metalurški zbornik, Ljubljana, Slovenija
Number: 1
ISSN: 0035-9645
Volume: 40
Year: 1993
Pages: from 277 to 292
Number of references: 18
Language: engleski
Summary: By application of horizontal drilling there is a way for
gettingproduction of mineral fluids from deposits which are notapproachable
or are not sufficiently approachable by vertical orother deviated wells.
Preparation, realisation and economicevaluation of horizontal wells are
great challenges forgeologists, drillers and fluid reservoir engineers.
Purposes ofhorizontal wells, types of those wells, as well as necessity
ofteam work of classical and new types of specialists during thewhole
process are described.
Keywords: horizontal drilling, types of wells, team work, fluid bearing rocks, geological control
- Type of paper
: Paper in journal
Title: Drilling Fluid for Horizontal Drilling
- Authors:
- Martinko, Božidar (150256)
Journal: Nafta, Zagreb
Number: 5
ISSN: 0027-755
Volume: 42
Year: 1991
Pages: from 175 to 179
Number of references: 8
Language: hrvatski
Summary: During the drilling of horizontal (or highly deviated)
wellsthere are more serious problems than in drilling of verticalwells.
These problems are: excessive torque and drag, holefilling, pipe stucking,
hole instability, circulation losses,formation damage, difficulties at
logging and poor cementation.From that reason the mud for horizontal
drilling must have suchproperties which insure improved cleaning, cutting
suspension,good lubrication and relative low formation damage. The
mosteffective fluid for such purpose is a biopolymer (XC) drillingfluid. In
this article composition, properties and application ofthis type of fluid
are described.
Keywords: horizontal drilling, biopolymer (XC) mud, composition and properties of XC mud
- Type of paper
: Paper in journal
Title: Practical Application of Some Comparative Methods and
Procedures to Elaborate Drilling Parameters
- Authors:
- Krištafor, Zdenko (98523)
- Simon, Katarina (162761)
Journal: Nafta, Zagreb
Number: 5
ISSN: 0027-755
Volume: 42
Year: 1991
Pages: from 181 to 196
Number of references: 8
Language: hrvatski
Summary: To reach optimum in drilling parameters is an exacting step
indesign of wells both from technical, technological and economicpoint of
view as well as from standpoint of safety for the crew,equipment and
environment. The authors display a practicalapplication of some compatible
methods and procedures for thedevelopment of drilling parameters in various
formations of theoilfield Obod-Lacići. The need for multiple verification
of basisdata is suggested with the purpose to confirm them and toascertain
methods and procedures through and by their practicalapplication. A better
perception of formations shall be madepossible through and by the results
deriving and obtainedtherefrom and facilitate the choice of roller cone
bits and theway of their utilization to agree with criteria to obtain
anoptimum.
Keywords: threshold weight, drill-off test, 5-spot drill-off test, breccia-conglomerate, perfect cleaning conditions
- Type of paper
: Paper in journal
Title: Formation Damage During Specific Operations
- Authors:
- Martinko, Božidar (150256)
Journal: Nafta, Zagreb
Number: 7
ISSN: 0027-755
Volume: 42
Year: 1991
Pages: from 287 to 294
Number of references: 13
Language: hrvatski
Summary: In this article which is made by using the data of
contributedliterature (13 references) are described the types of
formationdamage, their arrising during specific operations in the hole
andmeasures which help us in minimizing this problem.
Keywords: formation damage, types of damage, potential contaminants, maesures for regaining
- Type of paper
: Paper in journal
Title: Low Solids Non-Dispersed Mud
- Authors:
- Martinko, Božidar (150256)
Journal: Rudarsko-metalurški zbornik, Ljubljana, Slovenija
Number: 3
ISSN: 0035-9645
Volume: 38
Year: 1991
Pages: from 441 to 447
Number of references: 4
Language: hrvatski
Summary: The successful drilling of troublesome shaley formations
requiressuch mud type which will be effective in view of stabilizationand
which will have some other advantages in relation toconventional muds. By
usage of long chain polymers such aspolyacrilate in preparing low solids
non-dispersed mud thisproblem was successfully solved. at the same time
stabilizationof shaley formations was achieved.This article
discussescharacteristics of long chain polymers, their function in the
mudand criterions in preparing and maintaining low solidsnon-dispersed mud.
Keywords: Non-dispersed drilling fluid, shale, long chain polymer, wellbore stability
- Type of paper
: Paper in journal
Title: Investigation of Chemical Compatibility of Formation Water
With CaCl2 and CaBr2 Brines
- Authors:
- Martinko, Božidar (150256)
Journal: Nafta, Zagreb
Number: 5
ISSN: 0027-755
Volume: 44
Year: 1993
Pages: from 265 to 269
Number of references: 5
Language: hrvatski
Summary: During workover in the wells we predominantly use NaCl,
CaCl2 orCaBr2 solutions.Since formation water contains considerableamounts
of HCO3 and SO4 ions and CaCl2 and CaBr2 brine highconcentration of Ca
ions, there is a real chance to get CaCO3 orCaSO4 percipitate.The fine
particles of this percipitate cancause serious formation damage of layers
in borehole surroundig. To confirm the percipitate occurence laboratory
investigation wasperformed at different pH values of fluids and at
temperatures of25, 50 and 75 grades of Celsius.The percipitation with water
richin HCO3 has occured and with SO4 failed.
Keywords: chemical compactibility, formation water, brines, percipitation, formation damage
- Type of paper
: Paper in journal
Title: The Influence of Polyhydroxycarboxylates on Corrosion
Inhibition of Mild Steel in Molybdate Solutions
- Authors:
- Šarc-Lahodny, Olga (46003)
- Orlović-Leko, Palma (164853)
Journal: Naftaplin, Zagreb
Number: 11
ISSN: 0351-8655
Volume: 9
Year: 1991
Pages: from 11 to 18
Number of references: 9
Language: engleski
Summary: Potentiodynamic anodic polarization measurements on mild
steel insolutions of sodium molybdate, prepared with tap water, haveshown
that the addition of small amounts ofpolyhydroxycarboxylates, gluconate or
borogluconate increased theinhibition efficiency. The presence of layers of
the oxide oroxyhydroxide layers on the metal surface is necessary for
theprotection. The same effect, less pronounced, was observed alsowith
tartarate. The concentration of the added citrate adequateto the content of
calcium ions in the tap water, prevents thepercipitation of molybdate.
Keywords: corrosion inhibition, mild steel, polyhydroxycarboxylates, gluconates, Na-molybdate
- Type of paper
: Paper in journal
Title: Problems in Tubing/Packer System
- Authors:
- Matanović, Davorin (87510)
- Livaja, Mario
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
Number: 1
ISSN: 0353-4529
Volume: 5
Year: 1993
Pages: from 209 to 214
Number of references: 6
Language: hrvatski
Summary: When gas and oil wells are completed and produced or
treatedthrough the tubing connected to packer, there is a great numberof
problems to be solved. Changes in temperatures and pressuresthat occure
during various operations usually results in changesin tubing lengths or
tubing to packer forces, depending on tubingto packer connections. This
paper summarises some earlier papersand explains partly elaborated details.
It also gives a completeapproach to solve problems in uniform strings
regardless totubing and packer connections.
Keywords: tubing, packer, forces, movements, stresses
- Type of paper
: Paper in journal
Title: Some more aspects on wearing out of mud pump pistons and
cylinders
- Authors:
- Matanović, Davorin (87510)
Journal: Nafta, Zagreb
Number: 7
ISSN: 0027-755
Volume: 42
Year: 1991
Pages: from 295 to 299
Number of references: 4
Language: hrvatski
Summary: The wearing out of a mud pump cylinder is not equable along
itsaxis.It depends on piston dynamics. It is also found that thereis a
relation between cylinder and piston wearing out andaberration from
cylinder section spherness.
Keywords: mud pumps, wearing out, dynamics
- Type of paper
: Paper in journal
Title: Clearance Determination of Buckled Tubing
- Authors:
- Matanović, Davorin (87510)
Journal: Nafta, Zagreb
Number: 2
ISSN: 0027-755
Volume: 44
Year: 1993
Pages: from 109 to 114
Number of references: 3
Language: engleski
Summary: It is of great importance to determine the exact length of
thetool of known diameter which is to be implemented into a boreholeat
certain circumstances. The tubing slack off or pressure andtemperature
effects can cause the tubing buckling all of whichprevent the manipulation
with tools.
Keywords: tubing, buckling, clearance
- Type of paper
: Paper in journal
Title: Gas Production Possibilities from Coalbeds
- Authors:
- Steiner, Ivo (44756)
- Labudović, Vladimir
- Matiša, Željko
- Mraz, Juraj
Journal: Naftaplin, Zagreb
Number: 2
Volume: 15
Year: 1994
Pages: from 36 to 43
Number of references: 17
Language: hrvatski
Summary: The paper presents the most essential eleements fo methan
extraction from coal and possibilities for application of that method i
Republicof Croatia. The method is relatively new and is developing fast all
over the world. It is suitable for application in Europe, which still has
large coal reserves. By the extraction of methan from coal, the socalled
clean energy is obtained. Because of that, such methane production has
state support in US, which enhances its economical application. The
Republic of Croatia has quite significant reserves of coal exceeding 250
million tons. Since opening of new coal mines not foreseen, application of
the proposed method may enable partial utilization of energy potential of
these reserves, if naturally conditions for that exist.
Keywords: coal beds, phisycal parameters,hydraulic fracturing,methan extraction
- Type of paper
: Paper in journal
Title: Evaluation of Success of Chemical Stimulation Applied to
Remove Producing Formation Damage Caused by Solidified Polymer
- Authors:
- Krilov, Zoran (142621)
- Tomić, Mihovil
- Lončarić, Božidar
- Čikeš, Marin
Journal: Naftaplin, Zagreb
Number: 1
Volume: 16
Year: 1995
Pages: from 100 to 108
Number of references: 14
Language: hrvatski
Summary: The laboratory investigations showed that production
decline of Stari Gradac-5 gas condensate well has been caused by
solidification of polymer after setting the gelled brine plugs during well
completion operations. The procedure for disintegration of viscoelastic,
highly chemically resistant material, formed downhole under extremely high
temperature conditions, was designed in laboratory. After performing the
well stimulation job, the increase of gas and condensate production proved
the prosperity of this specific method for removing the formation damage.
Keywords: permeability, formation damage, chemical tretment, stimulation procedure
- Type of paper
: Paper in journal
Title: The Chemical Formation Damage Effect Caused by Wellbore
Fluids
- Authors:
- Martinko, Božidar (150256)
Journal: Nafta, Zagreb
Number: 1
Volume: 45
Year: 1994
Pages: from 53 to 61
Number of references: 11
Language: hrvatski
Summary: The formation damage which is manifested in reduction of
rock natural permeability, generally is caused by alteration of clay
minerals as constituents of formations. The clay in contact with wellbore
fluid (completion brines, mud or cement filtrate) may expand or disperse
them depends of their composition and origin. Great role in that process
plays apH value of wellbore fluid, its salt concentration and ionic
strength. The intention of this paper is to explain achieved results of
investigetions carryed out for INA Naftaplin.
Keywords: formation damage,permeability reduction,critical salt concentration,critical ion strength,wellbore fluid
- Type of paper
: Paper in journal
Title: Optimiranje klipnih brtvila isplačnih sisaljki
- Authors:
- Matanović, Davorin (87510)
Journal: Nafta, Zagreb
Number: 1
Volume: 45
Year: 1994
Pages: from 21 to 38
Number of references: 13
Language: engleski
Summary: In order to select a proper material for the fabrication of
wear parts in various tribological systems, it is necessary to consider the
factors which actually make the system itself, physical properties of
material structure essential for the function, and tribological
characteristics relevant for the selection of certain material. The
construction of a device for testing piston materials in mud pumps,
definition of testing procedure and evaluation of the obtained results are
treated in the paper. The tests were carried out on two different samples.
The results have been elaborated, based on measured friction forces and
relevant friction coefficients, loss in mass or volume, linear intensity of
material wear, average shear stress and apparent energy density of
friction. Besides the described application of the device for simulating
the hydraulic section of the mud pump, it can also simulate many other
actual tribological systems.
Keywords: packings,elastomers,wear
- Type of paper
: Paper in journal
Title: Ispiranje pijesaka savitljivim tubingom
- Authors:
- Matanović, Davorin (87510)
- Krištafor, Zdenko (98523)
- Gaurina-Međimurec, Nediljka (98545)
Journal: Nafta, Zagreb
Number: 8
Volume: 45
Year: 1994
Pages: from 389 to 396
Number of references: 7
Language: engleski
Summary: The paper discusses the proces of sand (sediment;grounds)
washing out by utilization of coiled tubing and Newtonian fluids. The
factors that influenced wasing out are discussed, too. In order to that
washing out i carried properly, the pump capaciry must be defined so that
the necessary fluid flow velocity is achieved in the area of annulus, as
well as pressure drop during the fluid flow at so defined capaciry.
Keywords: coiled tubing,sand washing,Newtonian fluids,Pressure drop
- Type of paper
: Paper in journal
Title: Drilling with coiled tubing - needs and possibilities
- Authors:
- Matanović, Davorin (87510)
Journal: Naftaplin, Zagreb
Number: 1
ISSN: -
Volume: 16
Year: 1995
Pages: from 51 to 55
Number of references: 6
Language: hrvatski
Summary: Most of gas and oil fields discovered up to day in Croatia
represent the hydrocarbon accumulations in layers of low permeability. To
increase production it is necessary to re-drill many old wells. It can be
done by drilling with coiled tubing. Before that there are several problems
that must be solved. First of all is the construction and manufacture of
injector head of enough load capacity for increased weights when large
diameter coiled tubing is used. Stresses associated whwn drilling with
positive displacement motors, drill collars and other bottomhole assemblies
should be computed and tested due to torsion to ensure that they can resist
the torque during drilling.
Keywords: drilling,coiled tubing
- Type of paper
: Paper in journal
Title: Mehanički čimbenici nestabilnosti kanala bušotine
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
Journal: Nafta, Zagreb
Number: 3
Volume: 45
Year: 1994
Pages: from 161 to 170
Number of references: 14
Language: engleski
Summary: Mechanical factors of wellbore instability related to
pressures and stresses, shown on wellbore walls, are here presented, as
well as rock capability withstand them. Usin equations listed in the paper,
pressures (pore pressure, hydrostatic, hydrodinamic), stresses around the
borehole caused by pressure changes can be described, as well as wellbore
stability conditions. The influence of well pressure on establishing a new
stress condition is emphasized, and rock behaviour under stress (is)
considered.
Keywords: wellbore stability,pore pressure,hydrostatic pressure,horizontal stresses,tectonic forces,thermal stresses,hole enlargement
- Type of paper
: Paper in journal
Title: Factors of Wellbore Instability
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
Journal: Naftaplin, Zagreb
Number: 1
Volume: 16
Year: 1995
Pages: from 38 to 43
Number of references: 11
Language: hrvatski
Summary: Mechanical factors of wellbore instability,
physical-chemical reaction between mud and rocks, their influence on
wellbore stability, and measures which have to be undertaken for wellbore
stabilizing are here presented. Time during which wellbore is stying stable
varies from several hours to several months. It depends on naturally
fractured rocks, mud quality and applied drilling technology.
Keywords: wellbore stability,shale hydration,swelling pressure,mud
- Type of paper
: Paper in journal
Title: Specifičnosti gušenja proizvodnih plinskih bušotina
- Authors:
- Matanović, Davorin (87510)
- Gaurina-Međimurec, Nediljka (98545)
- Krištafor, Zdenko (98523)
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
Volume: 6
Year: 1994
Pages: from 121 to 126
Number of references: 5
Language: engleski
Summary: The purpose of this paper is to determine basic principles
of producing gas wells completion. Consideration is complex in any segment
considering production layers or production equipment. By chosing adequate
equipment we can neglect further need for recompletion and workovers.
Keywords: production well,well completion
- Type of paper
: Paper in journal
Title: Cementne kaše za cementiranje geotermalnih bušotina
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
- Matanović, Davorin (87510)
- Krklec, Gracijan
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
Volume: 6
Year: 1994
Pages: from 127 to 134
Number of references: 27
Language: engleski
Summary: During a well cementing special place belongs to the cement
slurry design. Cement system designs for geothermal wells differ from those
for conventional high temperature oil and gs wells in the exclusive use of
silica flour insted of silica sand, and the avoidance of fly ash as an
extender. In this paper,Portland cement behaviour at high temperatures is
described. Cement slurry and set cement properties are also described.
Published in literature, the composition of cement slurries which were
tested in geothermal conditions and which obtained required compressive
strength and water permeability are listed. As a case of our practice
geothermal wells Velika Ciglena-1 i Velika Ciglena-1a are described.
Keywords: geothermal wells,cementing,cement slurry,strength retrogression
- Type of paper
: Paper in journal
Title: Application of MWD Systems in Drilling Wells
- Authors:
- Simon, Katarina
- Krištafor, Zdenko (98523)
Journal: Naftaplin, Zagreb
Number: 2
Volume: 15
Year: 1994
Pages: from 51 to 56
Number of references: 4
Language: hrvatski
Summary: The paper presents the MWD systems used today in the field
to obtain data during well drilling. Based on these data a picture is
formed on what is happening in the wellbore, reducing risk pertinent to
well drilling. This refers particularly to horizontal well drilling. The
most commercial system is transmission of data over the mud pressure
impulse, which is represented in more detail.
Keywords: MWD system,horizontal well drilling,trajectory control
- Type of paper
: Paper in proceedings
Title: The Applicability of Lasers in Gas Flow Measurement
- Authors:
- Steiner, Ivo (44756)
- Krištafor, Zdenko (98523)
- Drakulić, Radenko
- Editors
- Pejčinović, Vladimir
- Gradiški, Marija
- Antolić, Josip
Proceedings title: Zbornik radova VIII. medjunarodni susret stručnjaka za plin
Language: hrvatski
Place: Opatija
Year: 1993
Pages: from 10 to 1
Meeting: VIII. međunarodni susret stručnjaka za plin
Held: from 05/05/93 to 05/07/93
Summary: Existing flowmeters for gas measurement give vague readouts
incondition of high discrepancies between minimum and maximumvalues (1:20
and more). The application of lasers for theillumination of the seeded
fluid flow allows introduction ofoptical methods that yield accurate
velocity data (SpeckleVelocimetry and Particle Image Velocimetry). The rate
ofvelocities to be measured range from very low to about 500 m/s.The
principles of Particle Image Velocimetry together with itsrecent
applications in various fluid dynamics problems arepresented. ina addition
a concept of its application in gasindustry is proposed.
Keywords: gas flow velocity measurement, Particle Image Velocimetry, laser
- Type of paper
: Paper in proceedings
Title: Optimization of Drilling Bit Nozzles Efficiency by
Application of Non-Destructive Optical Methods
- Authors:
- Drakulic, Radenko
- Steiner, Ivo (44756)
- Grant, Ian
Proceedings title: Proceedings of the 22nd Petroleum Itinerary Congress and Exhibition of OMBKE
Language: engleski
Place: Tihany, Madjarska
Year: 1993
Pages: from 1 to 10
Meeting: 22 nd Petroleum Itinerary Congress and Exhibition of OMBKE (Hungary)
Held: from 10/06/93 to 10/09/93
Summary: Hydraulic parameters regularly monitored in drilling
activitiesare jet velocity, hydraulic horsepower and impact force.
Existingmethods provide this parameters to be calculated only at thenozzle
outlet. PIV technique enables velocity measurements to becarried out
simultaneously over the entire profile of the flow,allowing hydraulic
parameters to be studied at any point betweenthe nozzle outlet and the hole
bottom. Various three-dimensionalnozzles tested have their application in
the improvement ofdrilling bit design, especially of PDC bits. Employed
techniquesallow effective evaluation of nozzles, better understanding ofthe
high velocity jet behaviour and may significantly contributeto the
optimization of drilling hydraulics.
Keywords: drilling bit, nozzle, jet velocity, Particle Image Velocimetry (PIV), three-dimensional nozzles
- Type of paper
: Paper in proceedings
Title: Protection of Rusted Steel Surface by Inhibitors
- Authors:
- Šarc-Lahodny, Olga (46003)
- Žagar, Hrvojka
- Editors
- Esih, Ivan
Proceedings title: Zbirka referata 10. savjetovanja o zaštiti materijala i industrijskom finišu, Za
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 59 to 63
Meeting: 10. savjetovanje o zaštiti materijala i industrijskom finišu, Zagreb
Held: from 06/18/92 to 06/19/92
Summary: The action of tanic acid of different concentration on the
rustedsurface of mild steel have been studied. The aim of the work wasto
protect a surface of metal partly covered with corrosionproducts. An
adventage of the procedure with tanic acid is itsecological compatibility,
low cost and the fact that when used inlow concentration does not provoke
local attack of the surfacewhich is otherwise a characteristic of other
anodic inhibitors.An inhibition action was demonstrated by anodic
polarizationmeasurement.
Keywords: tanic acid, ecologicaly compatible inhibitor, rust conversion in protective layer, potentiodynamic polarization
- Type of paper
: Paper in proceedings
Title: Some Knowledge about Killing Gas Production Deep Wells in
Croatia
- Authors:
- Matanović, Davorin (87510)
- Gaurina-Međimurec, Nediljka (98545)
Proceedings title: Proceedings of the 22 nd Petroleum Itinerary Congress and Exhibition, Tihany (H
Language: engleski
Place: Tihany, Madjarska
Year: 1993
Pages: from 16 to 11
Meeting: 22 nd Petroleum Itinerary Congress and Exhibition of OMBKE (Hungary)
Held: from 10/06/93 to 10/09/93
Summary: The most frequent reason for killing production wells is
anecessity to eliminate formation pressures so as to enablecertain
procedures or removal of some parts of productionequipment. In the process
of well killing it must be taken carenot to: cause formation damage,
additionally damage surface orsubsurface production equipment and exceed
the allowed stressesof production and other equipment. The standard
procedure adoptedin Croatia is described.
Keywords: well killing procedure, production formation pressure, killing fluid, brine
- Type of paper
: Paper in proceedings
Title: Optimisation of Wellbore Circulation by Gaseous Drilling
Fluids
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
- Simon, Katarina (162761)
- Editors
- Pejčinović, Vladimir
- Gradiški, Marija
- Antolić, Josip
Proceedings title: Zbornik radova VIII. međunarodni susret stručnjaka za plin
Language: hrvatski
Place: Opatija
Year: 1993
Pages: from 1 to 14
Meeting: VIII. međunarodni susret stručnjaka za plin
Held: from 05/05/93 to 05/07/93
Summary: In the paper the problems with application of gaseous
drillingfluids in wellbores are described. Listed are advantages
ofapplication of nitrogen compared with air as media for decreasingdensity
of drilling fluid. Calculation of basic parameters inflow of gaseous
drilling fluids is given too.
Keywords: drilling fluid loss, casing cementing, coring, preforating, gaseous drilling fluid, aerated drilling fluid
- Type of paper
: Paper in proceedings
Title: Enhancing Well Completion by Nitrogen Application
- Authors:
- Matanović, Davorin (87510)
- Editors
- Pejčinović, Vladimir
- Gradiški, Marija
- Antolić, Josip
Proceedings title: Zbornik radova VIII. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Opatija
Year: 1993
Pages: from 1 to 12
Meeting: VIII. međunarodni susret stručnjaka za plin
Held: from 05/05/93 to 05/07/93
Summary: One of modern technical activities which enable optimal
workoverand maintenance of wells is the application of nitrogen, a gaswhich
is the most convenient gas for wellbore activities becauseof its physical
and chemical properties, economic advantages andsafety. By application of
nitrogen in wellbore activities inworkover and maintenance two facts are
substantial: applicabilityin situation of workover when necessary activity
cannot berealised by classical methods and , what is more
important,trealisation of the same activities much faster and lessexpensive
than it can be realised by classical methods.
Keywords: wellbore completion, workover, pressure, nitrogen, casing perforating, casing cementing, foam
- Type of paper
: Paper in proceedings
Title: Achievements in Wellbore Completion and Workover
- Authors:
- Matanović, Davorin (87510)
- Gaurina-Međimurec, Nediljka (98545)
- Forko, Stjepan
- Editors
- Gaurina-Međimurec, Nediljka (98545)
- Krilov, Zoran (142621)
- Rajković, Damir
- Vrkljan, Darko
- Zorić, Igor
Proceedings title: Zbornik radova "Doprinos rudarstva energetici Hrvatske"
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 111 to 120
Meeting: Simpozij "Doprinos rudarstva energetici Hrvatske"
Held: from 12/03/93 to 12/03/93
Summary: The role of well comletion when considered in an overall
wellconstructiion process is a complex one. It includes analysis ofwell
purpose, collected data and assumption produced by variousspecialists whose
job is related to proper functioning of thewell during its "life time". The
well completion carried out onceduring the well utilization should be
considered ideal.Only, mostoften it is not possible to realise. Therfore,
it is necessary toconsider costs, equipment, and application of properly
timedprocedures for keeping the continuity of well production orinjection
in advance. In this paper the accomplishments in wellcompletion in Croatia
are dealt with.
Keywords: completion, workover, service fluids
- Type of paper
: Paper in proceedings
Title: Development of drilling activities
- Authors:
- Kavedžija, Boris (87506)
- Krištafor, Zdenko (98523)
- Editors
- Gaurina-Međimurec, Nediljka (98545)
- Krilov, Zoran (142621)
- Rajković, Damir
- Vrkljan, Darko
- Zorić, Igor
Proceedings title: Zbornik radova Simpozija "Doprinos rudarstva energetici Hrvatske"
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 95 to 100
Meeting: Simpozij "Doprinos rudarstva energetici Hrvatske"
Held: from 12/03/93 to 12/03/93
Summary: The objective of this paper is to point out the
significance ofwell construction processes in creating an overall
Croatianpolicy in the oil industry. The basic phases in development
ofpetroleum engineering are dealt in the paper considering
relevantaccomplishments in field applications, science and education
ofspecialists in the course of the last fifty years.
Keywords: drilling, oil industry, specialist education
- Type of paper
: Paper in proceedings
Title: Petroleum Engineering Education at the University in
Zagreb
- Authors:
- Steiner, Ivo (44756)
- Editors
- Gaurina-Međimurec, Nediljka (98545)
- Krilov, Zoran (142621)
- Rajković, Damir
- Vrkljan, Darko
- Zorić, Igor
Proceedings title: Zbornik radova Simpozija "Doprinos rudarstva energetici Hrvatske"
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 1 to 22
Meeting: Simpozij "Doprinos rudarstva energetici Hrvatske"
Held: from 12/03/93 to 12/03/93
Summary: Petroleum engineering education at the University of Zagreb
wasdeveloped according to the development and requirements of thedomestic
oil and gas production. During 45 years of activitynecessary number of
specialists has been educated and necessarynumber of educators has been
made competent for overcomingeducational and scientifical investigation
needs.
Keywords: petroleum engineering education, petroleum industry, students, faculty (educators), scientific research
- Type of paper
: Paper in proceedings
Title: Reservoir Rock Characterisation Using Computed Tomography
- Authors:
- Goričnik, Bogdan (72195)
- Krilov, Zoran (142621)
- Marotti, M.
Proceedings title: Proceedings of the European Oil and Gas Conference in Altavilla Milicia (Palermo
Language: engleski
Place: London, Velika Britanija
Year: 1991
ISBN/ISSN: 1-85-333-622x
Pages: from 205 to 205
Meeting: European Oil and Gas Conference held in Altavilla Milicia (Palermo, Sicily, Italy)
Held: from 10/09/90 to 10/12/90
Summary: X-ray computed tomography (CT) technique has been
increasinglyused in petroleum industry for rock petrophysical and
mineralproperty evaluation. Samples from oil nad gas wells in Croatiawere
tested. X-ray scanning technique (SEM) was also applied toevaluate
formation damage in terms of permeability impairmentcaused by mud invasion
into sandstone samples from a gas well.
Keywords: computed tomography (CT), scanning electron microscopy (SEM), sandstone, formation damage (permeability impairment)
- Type of paper
: Paper in proceedings
Title: Formation damage Study Using Computed Tomography
- Authors:
- Krilov, Zoran (142621)
- Goričnik, Bogdan (72195)
- Wojtanowicz, Andrew K.
Proceedings title: Fall Meeting of the American Filtration Society, Baton Rouge,LA,USA
Language: engleski
Place: Houston, Texas, SAD
Year: 1991
ISBN/ISSN: 0-87201-111-9
Pages: from 434 to 454
Meeting: Fall Meeting of the American Filtration Society
Held: from 10/29/90 to 10/30/90
Summary: Application of CT technique to formation damage
characterisation.Comparing with SEM analyses. Evaluation and identification
ofsolid particles transported into sandstone samples by mudinvasion and
those originating from the rock sample.
Keywords: formation damage, computed tomography, scanning electron microscopy, sandstone sample, solid invasion
- Type of paper
: Paper in proceedings
Title: Quantitative Determination of Solids Invasion and
Formation Damage Using CAT Scan and Barite Suspensions
- Authors:
- Krilov, Zoran (142621)
- Steiner, Ivo (44756)
- Goričnik, Bogdan (72195)
- Čabrajac, Stevo
- Wojtanowicz, Andrew K.
Proceedings title: Proceedings of the SPE Offshore Europe Conference, Aberdeen, U.K.
Language: engleski
Place: Aberdeen, Scotland, Velika Britanija
Year: 1991
Pages: from 55 to 66
Meeting: SPE Offshore Europe Conference
Held: from 09/03/91 to 09/06/91
Summary: Presented are results of an experimental study of
formationpermeability damage caused by invasion of the inert andextraneous
solids simulated by barite particles. Laboratory flowtests were performed
using two types of sandstone cores:outcrop-clay free and low clay content
cores from oil bearingformations. The cores were analysed using SEM,XRD and
pore sizedistribution. The prevailing mechanism of particle capture
andsubsequent permeability reduction under test conditions was foundto be
cake forming (particle straining) mechanism.
Keywords: sandstone, formation damage, barite, CT analysis, SEM analysis, pore size distribution
- Type of paper
: Paper in proceedings
Title: Feasibility Study on Using Waste Drilling Fluids for
Construction Ceramics
- Authors:
- Steiner, Ivo (44756)
- Šarc-Lahodny, Olga (46003)
- Ristić, Božidar
- Isakov, Milivoj
Proceedings title: Advances in Filtration and Separation Technology, Volume 3, Polution Control Tec
Language: engleski
Place: Houston, Texas, SAD
Year: 1991
ISBN/ISSN: 0-87201-111-9
Pages: from 377 to 381
Meeting: Fall Meeting of the American Filtration Society
Held: from 10/29/90 to 10/30/90
Summary: In contemporary rotary drilling operations drilling fluids
areunavoidable constituents of the process. From drilled rocksvarious salts
are entering the fluid. After use drilling fluidhas to be regenerated or
deposited. Deposits of that fluid oftenare harmful to the environment.
Investigation was done withapplication of waste mud as a constituent of
material forproduction of ceramics (bricks, road base plates etc.) Tests
withsamples from two waste mud deposits have shown encorageousresults.
Keywords: centrifuging, construction ceramics, dilution, environment, liquid phase, shrinkage, solid phase, test plate, waste drilling fluid, weight loss, X-Raying
- Type of paper
: Paper in proceedings
Title: Evaluation of Corrosion Inhibitor for Low pH Ammonium
Nitrate-Methanol Completion Fluid
- Authors:
- Krilov, Zoran (142621)
- Sorić, Tomislav
- Tomić, Mihovil
- Wojtanowicz, Andrew K.
Proceedings title: Proceedings of the 1991 SPE/APC Asia-Pacific Conference in Perth, Australia
Language: engleski
Place: Perth, Australia
Year: 1991
Pages: from 541 to 52
Meeting: 1991 SPE/APC Asia-Pacific Conference
Held: from 11/04/91 to 11/07/91
Summary: A specially formulated completion fluid, low pH ammonium
nitratemethanol water mixture (ANM), compatible with argillaceous
andcalcareous Adriatic Sea sandstone formations, appeared to be
verycorrosive for steel wellbore equipment. Two inhibitors, betweenmore
than twelve tested, have shown to be effective. One was anorganic amine
base material and the other an inorganic ammoniumdihydrogen phosphate base
material. Neighter of them causedpermeability damage of the tested
sandstone samples.
Keywords: Corrosion, inhibitor, steel, formation damage, sandstone
- Type of paper
: Paper in proceedings
Title: Reservoir Rock Permeability Damage Due to Percipitation of
Insoluble Salts from Cement Slurry Filtrate
- Authors:
- Krilov, Zoran (142621)
- Romić, Leo
- ćelap, Stojan
- Čabrajac, Stevo
Proceedings title: Proceedings of the Fourth Symposium on Mining Chemistry, Kiev, the Ukraine
Language: engleski
Place: Muenchen, Germany
Year: 1992
Pages: from 101 to 110
Meeting: Fourth Symposium on Mining Chemistry
Held: from 10/06/92 to 10/08/92
Summary: The phenomenon of percipitation the insoluble salts
particularlycalcium carbonate deposited from cement filtrate into a rock
porespace as a potential source of formation permeability damage
wasstudied. The impact of percipitation of insoluble salts on
rockpermeability reduction has been evaluated on the basis ofexperimental
results applying different analytical methods:chemical analysis,
permeability change measurement as well asX-ray computerised tomography
(CT) imaging technique. The use ofcellulose derivative, as fluid loss
control additive caused themost severe formation damage. The permeability
damage due topercipitation of calcium carbonate from cement slurry
filtratecould be partially recovered flushing the rock with brine.
Keywords: formation permeability damage, cement slurry, cement slurry filtrate, salt percipitation, flushing with brine
- Type of paper
: Paper in proceedings
Title: Permeability Damage Due to Percipitation of Insoluble
Salts from Cement Slurry Filtrate
- Authors:
- Krilov, Zoran (142621)
- Romić, Leo
- ćelap, Stojan
- Čabrajac, Stevo
Proceedings title: Proceedings of the International Symposium on Oilfield Chemistry, New Orleans,LA
Language: engleski
Place: New Orleans, Louisiana, SAD
Year: 1993
Pages: from 249 to 262
Meeting: International Symposium on Oilfield Chemistry
Held: from 03/02/93 to 03/05/93
Summary: Series of flow tests were run in laboratory on sandstone
rocksamples using cement slurry filtrate containing variousadditives. The
use of cellulose derivative, as fluid loss controladditive, caused the most
severe damage of the permeability. Byflushing the rock sample with brine
lead to partial recovery ofthe permeability.
Keywords: sandstone formation damage, cement slurry filtrate, additives, brine
- Type of paper
: Paper in proceedings
Title: Dynamic Seals Used in Gas Production
- Authors:
- Matanović, Davorin (87510)
- Magdić, Dražen
Proceedings title: Zbornik radova VII. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Opatija
Year: 1991
Pages: from 1 to 15
Meeting: 22 nd Petroleum Itinerary Congress and Exhibition
Held: from 10/08/91 to 10/11/91
Summary: By application of equipment for tests of seals in
dynamicconditions we can achieve substantial progress compared with
allother applied methods of testing of seals and sealing materials.The
results achieved may be used in designing of equipment whichis build in in
the well bottom.
Keywords: seal, packer, dynamic test
- Type of paper
: Paper in proceedings
Title: Improvement of Dynamic Seals in Petroleum Engineering
- Authors:
- Matanović, Davorin (87510)
Proceedings title: Zbornik KoREMA
Language: engleski
Place: Zagreb
Year: 1992
Pages: from 179 to 183
Meeting: 37. međunarodni godišnji skup KoREMA
Held: from 04/26/92 to 04/29/92
Summary: Contact and sealing between two surfaces that are in
reciprocalmotion is provided by dynamic seals. In petroleum
engineeringactivities seals undergo a constant influence of
environmentalpressures, temperatures and various working fluids.Design of
aninstrument is suggested which simulates most of these conditions.
Keywords: dynamic sealing, seal, borehole fluid, pressure, temperature
- Type of paper
: Paper in proceedings
Title: More Accurate Approach in Accumulator Capacity Calculating
- Authors:
- Krištafor, Zdenko (98523)
- Golub, Miroslav
- Matanović, Davorin (87510)
- Kavedžija, Boris (87506)
Proceedings title: Proceedings of the Technical Conference on New Methods and Technologies in Petro
Language: engleski
Place: Krakow, Poljska
Year: 1992
Pages: from 191 to 195
Meeting: Technical Conference on New Methods and Technologies in Petroleum Geology, Drilling and Reservoir Engineering of the Academy of Mining and Metallurgy
Held: from 09/17/92 to 09/19/92
Summary: Adequate accumulator capacity is necessary for reliable
operationof a blowout preventer. Taking into consideration
expectedthermodynamic conditions a method is presented for calculation
ofthis capacity.
Keywords: blowout preventer, accumulator, thermodynamics, pressure, temperature
- Type of paper
: Paper in proceedings
Title: What Else About Sizing Accumulator Volume of BOP Control
Systems
- Authors:
- Krištafor, Zdenko (98523)
- Golub, Miroslav
- Matanović, Davorin (87510)
Proceedings title: Mediterranean Petroleum Conference
Language: engleski
Place: Tripoli, Libia
Year: 1992
Pages: from 1 to 10
Meeting: Mediterranean Petroleum Conference
Held: from 01/19/92 to 01/22/92
Summary: By calculating a real accumulator capacity of working
fluidaccording to the equation of state for real gas and by assumingthat
the expansion of nitrogen is a polytropic change of statemore accurate
parameters on usable volume of workig fluid can beobtained. This is very
important in the extreme field conditions.
Keywords: blowout preventer, accumulator, thermodynamics, gas, nitrogen
- Type of paper
: Paper in proceedings
Title: Prijedlog novog obrazovnog sustava za energetičare u
Hrvatskoj
- Authors:
- Steiner, Ivo (44756)
- Šunić, Miljenko
- Editors
- Forko, Stjepan
- Franković, Bernard
Proceedings title: Energija i zaštita okoliša
Language: engleski
Place: Opatija
Year: 1994
Pages: from 457 to 462
Meeting: XIV Znanstveni skup o energiji i zaštiti okoliša
Held: from 10/26/94 to 10/28/94
Summary: Recent energy systems are among the largest, the most
widespread, the most essential, the most expensive, the most expansive and
the most influential technical systems. Their purpuseful desing,
construction, exploitation and exchange require multidisciplinary educated
and qualified professionals. Basic attitudes feasibility of respective
educational programs are suggested.
Keywords: energetics,energy system,education,need of experts,curricula,organization of studies
- Type of paper
: Paper in proceedings
Title: Dobivanje plina iz ugljenih ležišta
- Authors:
- Labudović, Vladimir
- Steiner, Ivo (44756)
- Editors
- Forko, Stjepan
- Franković, Bernard
Proceedings title: Energija i zaštita okoliša
Language: engleski
Place: Opatija
Year: 1994
Pages: from 145 to 152
Meeting: XIV Znanstveni skup o energiji i zaštiti okoliša
Held: from 10/24/94 to 10/28/94
Summary: By methane extraction from coal so called pure energy may
be produced. Conditions in Croatia are shown for methane production from
coal drilled through by oil and gas exploration and production wells as
well as from abandoned coal mines.
Keywords: gas extraction,coalbed,drilled wells,hydraulic fracturing,energetics,ecology
- Type of paper
: Paper in proceedings
Title: Local Gas Suply Based on Coal Bed Gasification
- Authors:
- Labudović, Vladimir
- Steiner, Ivo (44756)
- Matiša, Željko
- Mraz, Juraj
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova X. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Zagreb
Year: 1995
Pages: from 1 to 16
Meeting: X. međunarodni susret stručnjaka za plin
Held: from 05/03/95 to 05/05/95
Summary: Coalbeds may contain methane which may be desorbed by
adequate depression in wellbores. Pore surface in coal in which methane can
be adsorbed usually is 3 to 7 times higher than pore surface of a gas
bearing sandstone. Gas inflow condition through coal to a wellbore in the
wellbore surrounding zone may be improved by hydraulic fracturing. In
convenient condition by each of wells up to 5000 m3 of gas per day may be
produced and by a few local need of a smaller settlement can be satisfied.
Beside ecological advantage of application of gas as fuel, by degasation
coalbeds safety condition of a mine is improved in case of later subsurface
mining of partially degased coalbed.By investment need, by mean of
application and by safety of continous suplly this mean of unconventional
energy production has advantages compared to other, up to now studied
unconventional energy sources.
Keywords: coal,gas,sorbtion,hydraulic fracturing
- Type of paper
: Paper in proceedings
Title: Gas Well Completion Using Downhole Tool Strings
- Authors:
- Matanović, Davorin (87510)
- Krištafor, Zdenko (98523)
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova X. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Zagreb
Year: 1995
Pages: from 1 to 7
Meeting: X. međunarodni susret stručnjaka za plin
Held: from 05/03/95 to 05/05/95
Summary: Under combination completion of gas production wells we
consider all situations when one or more of the following exists: more than
one size of tubing, more than one size of casing, and two or more fluids in
the tubing and /or annulus. Such problems (movement and forces) are solved
as though each section is a separate uniform completion and tubing is
initially free to move. Analysis and solving begin with the lowermost
section and the algebraic sum of each section's length change is the total
length change. Neglecting of such approach and simplifying by reducing on
uniform zype can result with failure and recompletion expenses.
Keywords: tubing,well completion
- Type of paper
: Paper in proceedings
Title: Our Expiriences in Gas Well Cementing
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
- Pavić, Vjekoslav
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova IX. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 1 to 14
Meeting: IX. međunarodni susret stručnjaka za plin
Held: from 05/04/94 to 05/06/94
Summary: The phenomenon of annular fas flow through a column of
cement soon after placement is dangerous, costly and difficult to prevent.
The problems created by gas channeling range from expensive remedial
squeeze cementing operations to blow outs and well abandonment. In the
paper, causes of gas channeling, methods of gas channeling prevention and
our expirience in gas well cementing in Podravina region are described.
Keywords: gas channeling, cementing,gas wells,cement slurry
- Type of paper
: Paper in proceedings
Title: Particulars in Production Gas Wells Completion
- Authors:
- Matanović, Davorin (87510)
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova IX. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 1 to 22
Meeting: IX. međunarodni susret stručnjaka za plin
Held: from 05/04/94 to 05/06/94
Summary: The purpose of this paper is to determine basic principles
of producing gas well completion. Consideration is complex in any segment
considering production layers or production equipment. By chosing adequate
equipment we can neglect further need for recompletions and workovers.
Keywords: producing wells,well completion
- Type of paper
: Paper in proceedings
Title: Some Expiriences in Horizontal Well Drilling at Gas
Reservoirs
- Authors:
- Simon, Katarina
- Krištafor, Zdenko (98523)
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova IX. međunarodnog susreta stručnjaka za plin
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 1 to 13
Meeting: IX. međunarodni susret stručnjaka za plin
Held: from 05/04/94 to 05/06/94
Summary: The paper discusses the planning and drilling of first
horizontal well in Croatia, Ok-58H. Comparison of some parameters
(reservoir characteristics, typical trajectory points, types of drilling
fluid, MWD system and completion) with two other horizontal wells drilled
on gas field in Germany and US is given too.
Keywords: horizontal well,projecting,drilling,MWD system,mud
- Type of paper
: Paper in proceedings
Title: Ispitivanje stabilnosti kanala bušotine sa različitim
uzorcima stijenskih jezgri i inhibirajućih isplaka
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
- Steiner, Ivo (44756)
- Editors
- De Ghetto, Giambattista
Proceedings title: Proceedings
Language: engleski
Place: Ravenna, Italija
Year: 1995
Pages: from 575 to 582
Meeting: Offshore Mediterranean Conference
Held: from 03/17/95 to 03/17/95
Summary: Influence of different inhibitive systems on formation
cores was studied. Data are presented for hole sections having 17 1/2 and
12 1/4 inch diameter in two different wells in Croatia. Two series of tests
have been conducted, the first one in a roller oven at 150 F during 16
hours, and the second one in static condition at the same temperature
during 5, 10 and 15 days. Composition, properties, including CEC values of
formation cores and inhibitive fluids, as well as dispersability percentage
of cores in various fluids are presented.
Keywords: borehole stability,dispersion test,inhibitive mud
- Type of paper
: Paper in proceedings
Title:
- Authors:
- Drakulic, Radenko
- Steiner, Ivo (44756)
- Grant, Ian
Proceedings title: 1994, IADC/SPE Drilling Conference - Proceedings
Language: engleski
Place: Dallas, Texas
Year: 1994
Pages: from 187 to 194
Meeting: IADC/SPE Drilling Conference
Held: from 02/15/94 to 02/18/94
Summary: PIV&LDV, two non-destructive methods for fluids flow
velocity tests, were applied for investigetion of velocity measurement of
drilling fluid from drilling bit jets. PIV enables planar measurement of
the flow profile while LDV enables one-point measurement only. Jet
velocities on various distances from nozzle were measured and hydraulic
horsepowers and impact forces for the same distances were calculated.
Keywords: drilling bit nozzle,jet velocity,PIV,LDV,pressure distribution
- Type of paper
: Paper in proceedings
Title: Soil Pollution with Hydrocarbons - Determination,
Consequences and Sanation
- Authors:
- Muvrin, Boris
- Kavedžija, Boris (87506)
Proceedings title: Zbornik radova simpozija "gospodarenje otpadom Zagreb 94"
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 284 to 296
Meeting: Međunarodni znanstveno-stručni simpozij "Gospodarenje otpadom ZAGREB 94"
Held: from 11/23/94 to 11/25/94
Summary: The authors have elaborated basic consequences of soil
pollution with hydrocarbons considering specific possibilities research and
a part of results in case of soil pollution were reviewed. Measurements
were done on original smples which were taken on oil field Đeletovci.
Results can be used for prediction of spreading and intensity of soil and
underground water pollution as well as for undertaking sanation measures in
Croatian oil fields that had been under war actions.
Keywords: soil pollution with hydrocarbons,determination,sanation
- Type of paper
: Paper in proceedings
Title: Proučavanje mogućnosti uklanjanja oštećenja propusnosti
uzrokovanih solidificiranim polimerom u veoma vrućim bušotinama
- Authors:
- Krilov, Zoran (142621)
- Tomić, Mihovil
- Lončarić, Božidar
- Čikeš, Marin
Proceedings title: Proceedings of SPE International Symposium on Oilfield Chemistry
Language: engleski
Place: San Antonio, Texas
Year: 1995
Pages: from 743 to 745
Meeting: SPE International Symposium on Oilfield Chemistry
Held: from 02/14/95 to 02/17/95
Summary: The laboratory tests and attempted well stimulation jobs,
that an inconvenient type of formation damage caused by solidification of
calcium bromide - calcium carbonate high activity synthetic polymer system,
under temperature above 180 deg Celsiusa, used as temporary viscous plug
downholw, could be successfully removing using chemical treatment. The
method requers sequential injection of oxidant (NaOCL+NaOH) followed with
inhibited organic acid (CH3COOH) into damaged zone around wellbore. The
comparison of laboratory investigation data and field application of method
is expressed.
Keywords: laboratory tests,formation damage,well stimulation,synthetic polymer,high temperature
- Type of paper
: Paper in proceedings
Title: Preventing the Corrosion of Metals with Ecologically
Adequate Inhibitors
- Authors:
- Šarc-Lahodny, Olga (46003)
- Kapor, Frankica
- Orlović-Leko, Palma (164853)
Proceedings title: Zbirka referata 11. savjetovanja o zaštiti materijala i industrijskom finišu
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 1 to 8
Meeting: 11. savjetovanje o zaštiti materijala i industrijskom finišu
Held: from 06/23/94 to 06/24/94
Summary: he use of chemical inhibitors is very often the most
efficient way of preventing the corrosion of metalsin many industries in
spite of continuing advances in development of corrosion resistant
materials. There are also continous demands for improved technical
performance of inhibitors and at the same time an increased awareness for
the environmental safety. The mechanism of action and influence of the
inhibitors on the rate of corrosion in the near-neutral media (pH=5-9),
have been investigated and discused in the paper on the basis of the
literature and the results of the authors experimental work. It was
demonstrated, by electrochemical and weight loss measurements, that
commonly used passivators, as nitrites, phosphates and chromates, toxic or
provoking eutrophication substances, can be completely or at least partly,
replaced by some ecologically compatible chemicals, as benzoates,
polyhydroxycarboxylates, and less toxic passivators, molybdates and
borates.
Keywords: corrosion of mild steel,inhibitors,ecologically compatible chemical compounds,electrochemical test methods
- Type of paper
: Ph.D.
Title: An Add to Optimization of Slush Pumps Piston Seals
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: MATANOVIĆ DAVORIN
Date of defense: 11/16/92
Language: hrvatski
Number of pages: 163
Summary: In order to select a proper material for fabrication of
wearparts in various tribologycal systems it is necessary to
considerfactors which actually make the system itself, physicalproperties
of material structrue essential for the function andtribologycal
characteristics relevant for the selection ofcertain material. The
construction of an instrument for testingmaterials of seals in mud pumps,
definition of testing procedureand evaluation of the obtained results are
treated in this work.
Keywords: slush pump, piston seal, tribology, wear testing, instrument for tests
- Type of paper
: Ph.D.
Title: Process optimalization for recovery impovement by gas
recycling in oil reservoirs with gas-cap
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: JUTTNER IVANKA
Date of defense: 07/13/95
Language: hrvatski
Number of pages: 142
Summary: In theoretical part the paper is dealing with exact
hydrocarbon fluid composition studied by mathematical modeling of phase
behavior and volumetric prediction with Equation of State. Step by step is
shown recent calculation of phase behavior applying K-factors determined
from fugacity components by Equation of State. In case of the Žutica oil
field, a mathematical model of Peng-Robinson Equation of State was created
and applied in stimulation of a two thermodinamical process: a) gas
injection in reservoir attaining a miscible conditions; and b) gas storage
process. The results from two studied cases of possible oil-reservoir
managing ways show that the reservoir for gas storage is in many ways
better than applying the residual oil production regime by supporting
reservoir pressure with gas injection.
Keywords: gas recycling,Equation of State,phase behavior,miscible condition,gas storage process
- Type of paper
: Ph.D.
Title: The Contribution to Study of Reservoir Rocks Applying the
Analytical Method of X-Ray Computerized Tomography
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: KRILOV ZORAN
Date of defense: 07/11/95
Language: hrvatski
Number of pages: 227
Summary: Dissertation represents the first non-medical use of X-ray
computed tomography method in Croatia. After comprehensive preliminary
studies in methodology development CT imaging has been utilized in the
analysis of original reservoir rock core samples (obtained from wells in
Croatia, Slovenia and Siberia), in order to evaluate its lithological
homogenity, visualization of unconsolidated structure, determination of
rock porosity and studies of formation damage phenomena. The results showed
the evidence for the CT method applicability on formation damage studies:
mechanical (drilling mud - barium sulphate invasion) and
chemical-mechanical (cement slurry - coprecipitation of low soluble salts),
as well as fracture ayimuth determination (after microfracturing
operations).
Keywords: X-ray computed tomography, rock analysis, formation damage, drilling mud, cement slurry, hydraulic fracturing, fracture azimuth
- Type of paper
: Ph.D.
Title: Improvement of the Casing Design Method with Examples for
the Deep Drava Region
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: KRIŠTAFOR ZDENKO
Date of defense: 02/22/95
Language: hrvatski
Number of pages: 192
Summary: The casing setting depth selection of each individual type
of casing strings is an essential stage of the casing program as an
integral part of the well planning. An analysis has been made, based on
comparison of forecast and actual conditions in selected exploration and
development wells of the north-western area of the depression of Sava river
of the Panonian basin, where the application of various methods of casing
design reflects on the final selection of the casing. Optimizing the casing
design forsuch a delicate surrounding has in view the reciprocal dependence
of a number of factors and only by reconciling them shall an economically
viable and balanced solution be reached, acceptable from point of view of
tolerating of a necessary or permitted risk, of the safety of the progress
of further technological process, of the safety of equipment, labour and
environment.
Keywords: casing design,well planning,casing setting depth,exploration well,pressure gradient,master-log
- Type of paper
: Ph.D.
Title: Drilling of Technically Optimal Wells in Order to Achieve
Economical Recovery of Hydrocarbon Deposits
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: GAURINA-MEĐIMUREC NEDILJKA
Date of defense: 02/22/93
Language: hrvatski
Number of pages: 244
Summary: Broad literature was collected and reviewed. Methodology
for solving problems of wellbore enlargement caused by unstability and rock
structure was systematized. Influence of various fluids on wellbore cores
and on natural clays has been studied. Based on results achieved defined
actions have been established which are an add to better technical and
economical efficiency of deep drilling.
Keywords: drilling, wellbore stability, wellbore fluid, economics
- Type of paper
: Mentorship
Title: An Add to optimization of Slush Pump Piston Seals
Faculty: Rudarsko-geološko-naftni u Zagrebu
Mentor: KAVEDŽIJA BORIS
Date of defense: 11/16/92
Number of pages: 163
Author: Matanović Davorin
Degree level: Ph.D.
- Type of paper
: Mentorship
Title: Trajectory Cntrol and Measurement While Drilling in
Horizontal Wells
Faculty: Rudarsko-geološko-naftni u Zagrebu
Mentor: STEINER IVO
Date of defense: 02/10/94
Number of pages: 96
Author: Simon istraživač Katarina
Degree level: M.A.
- Type of paper
: Mentorship
Title: Improvement of the Casing Design Method with Examples for
the Deep Drava Region
Faculty: Rudarsko-geološko-naftni u Zagrebu
Mentor: STEINER IVO
Date of defense: 02/22/95
Number of pages: 192
Author: Krištafor Zdenko
Degree level: Ph.D.
- Type of paper
: Mentorship
Title: The Contribution to Study of Reservoir Rocks Applying the
Analytical Method of X-Ray Computerized Tomography
Faculty: Rudarsko-geološko-naftni u Zagrebu
Mentor: GORIČNIK BOGDAN
Date of defense: 07/11/95
Number of pages: 227
Author: Krilov Zoran
Degree level: Ph.D.
- Type of paper
: Mentorship
Title: Process Optimalization for Recovery Improvement by Gas
Recycling in Oil Reservoir with Gas Cap
Faculty: Rudarsko-geološko-naftni u Zagrebu
Mentor: GORIČNIK BOGDAN
Date of defense: 07/11/95
Number of pages: 142
Author: Juttner Ivanka
Degree level: Ph.D.
- Type of paper
: Invited lecture
Title: Comprehensive Assesment of Formation Damage Due to
Drilling and Completion
Institution: Louisiana State University
Year: 1994
- Type of paper
: Invited lecture
Title: Technology of Horizontal Drilling
Institution: Louisiana State University
Year: 1994
- Type of paper
: Invited lecture
Title: Life and Achievements of Captain Anthony F. Lucas
Institution: Louisiana State University
Year: 1994
- Type of paper
: Invited lecture
Title: Anton Lucic (Captain Lucas) - our petroleum explorer in
America
Institution: Tehnički muzej
Year: 1994
