- 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: 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
Summary: To reach optimum in drilling parameters is an exacting step
in design of wells both from technical, technological point of viewas well
as from standpoint of safety for the crew, equipment andenvironment. The
authors display a practical application of somecompatible methods and
procedures for the development of drillingparameters in various formations
of the oil field Obod-Lacići.The need for multiple verification of certain
methods andprocedures through and by their practical application. A
betterperception of formations shall be made possible through and bythe
results deriving and obtained therefore and faciliate thechoice of roller
cone bits and the way of their utilization toagree with criteria to obtain
an optimum.
Keywords: treshold weight, drill-off test, 5-spot drill-off test, breccia-conglomerate, perfect cleaning conditions
- 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: Problems in Tubing/Packer System
- Authors:
- Matanović, Davorin (87510)
- Livaja, Mario
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
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: Optimization of mud pump piston packings
- Authors:
- Matanović, Davorin (87510)
Journal: Nafta, Zagreb
Number: 1
ISSN: 0027-755X
Volume: 45
Year: 1994
Pages: from 21 to 38
Number of references: 13
Language: engleski
Summary: In order to select a proper material for fabrication of
wear parts in various tribologycal systems it is necessary to consider
factors which actually make the system itself, physical properties of
material structure essential for the function and tribologycal
characteristics relevant for the selection of certain material.
The construction of an instrument for testing materials of seals in mud
pumps, definition of testing procedure and evaluation of the obtained
results are treated in this work.
The tests were carried out with 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 wearing,
average shear stress, and apparent energy density of friction.
Beside the described application of the instrument for simulating a
hydraulic section of a mud pump, it can also simulate many other actual
tribologycal situations.
Keywords: packings,elastomers,wear
- Type of paper
: Paper in journal
Title: Sand washing with coiled tubing
- Authors:
- Matanović, Davorin (87510)
- Krištafor, Zdenko (98523)
Journal: Nafta, Zagreb
Number: 8
ISSN: 0027-755X
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 influence washing out are also discussed. In order that
washing out is carried out properly, the pump capacity 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 capacity.
Keywords: coiled tubing,well washing,Newtonian fluids,pressure drop
- Type of paper
: Paper in journal
Title: Particulars in killing gas production wells
- Authors:
- Matanović, Davorin (87510)
- Gaurina-Međimurec, Nediljka (98545)
- Krištafor, Zdenko (98523)
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
ISSN: 0353-4529
Volume: 6
Year: 1994
Pages: from 121 to 126
Number of references: 5
Language: engleski
Summary: To kill a production well means to perform some technical
and technological process for establishing the static hydraulic balance in
the well with no additional surface pressures. The standard procedure of
the well killing proces as adopted in Croatia, is described. Further, the
procedures of how to locate the spot where there is a leakage on production
equipment and how to determine the level of fluid in tubing or annulus is
explained. Finally, the aim of this paper is also to point out the
importance in selection of killing fluids considering a possibility of
formation damage.
Keywords: killing,fluids
- Type of paper
: Paper in journal
Title: Drilling with coiled tubing-needs and possibilities
- Authors:
- Matanović, Davorin (87510)
Journal: Naftaplin
Number: 1
ISSN: 1330-2434
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 bz 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 when 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: Cement slurries for geothermal wells cementing
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
- Matanović, Davorin (87510)
- Krklec, Gracijan
Journal: Rudarsko-geološko-naftni zbornik, Zagreb
ISSN: 0353-4529
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 gas wells in the exclusive use of
silica flour instead 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 and Velika Ciglena-1a are described.
Keywords: geothermal wells,cementing, cement slurry, strength retrogression
- Type of paper
: Paper in journal
Title: Mechanical factors of wellbore instability
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
Journal: Nafta, Zagreb
Number: 3
ISSN: 0027-755X
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. Using equations listed in the
paper, pressures (pore pressure, hydrodynamic), stresses around the
wellbore 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 stresses is
considered.
Keywords: wellbore stability, pore pressure,hydrostatic pressure, horizontal stresses, tectonic forces, thermal stresses, hole enlargement
- Type of paper
: Paper in journal
Title: Mechanical factors of wellbore instability
- Authors:
- Gaurina-Međimurec, Nediljka (98545)
Journal: Naftaplin
Number: 1
ISSN: 1330-2434
Volume: 16
Year: 1995
Pages: from 38 to 44
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 staying
stable varies from several hours to several months. It depends on naturally
fractured rocks, on mud quality and on applied drilling technology.
Keywords: wellbore stability,shale hydration,swelling pressure,mud
- Type of paper
: Paper in journal
Title: Aplication of MWD-systems in drilling wells
- Authors:
- Simon, Katarina (162761)
- Krištafor, Zdenko (98523)
Journal: Naftaplin
Number: 2
ISSN: 1330-2434
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 the risk pertient to
well drilling. This refers particularly to horizontal well drilling. The
most commercial system is the transmission of data over the mud pressure
impulse,which is exposed in more detail.
Keywords: horizontal well,MWD system,drilling path
- Type of paper
: Paper in proceedings
Title: What Else About Sizing Accumulator Volume of BOP Control
Systems
- Authors:
- Krištafor, Zdenko (98523)
- Golub, Miroslav (13820)
- Matanović, Davorin (87510)
Proceedings title: Mediterranean Petroleum Conference
Language: engleski
Place: Tripoli, Libija
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 working 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: Improvement of Dynamic Seals in Petroleum Engineering
- Authors:
- Matanović, Davorin (87510)
Proceedings title: Zbornik redova 37. međunarodni godišnji skup KoREMA
Language: engleski
Place: Zagreb
Year: 1992
ISBN/ISSN: 86-81571-11-7
Pages: from 179 to 183
Meeting: 37. međunarodni godišnji skup KoREMA, 8. simpozij o sistemima automatskog upravljanja
Held: from 04/26/92 to 04/27/92
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: Dynamic Seals Used in Gas Production
- Authors:
- Matanović, Davorin (87510)
- Magdić, Dražen (140106)
- Robić, Dražen
- Editors
- Pejčinović, Vladimir
Proceedings title: Zbornik radova VII. mađunarodni susret plinskih stručnjaka
Language: hrvatski
Place: Opatija
Year: 1991
Pages: from 1 to 15
Meeting: VII. međunarodni susret plinskih stručnjaka
Held: from 12/04/91 to 12/06/91
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 built in the
well bottom.
Keywords: seal, packer, wells, dynamic testing
- Type of paper
: Paper in proceedings
Title: More Accurate Approach in Accumulator Capacity Calculating
- Authors:
- Krištafor, Zdenko (98523)
- Golub, Miroslav (13820)
- 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: 5th International Scientific-Technical Conference on New Methods and Technologies in Petroleum Geology, Drilling and Reservoir Engineering
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: Enhancing Well Completion by Nitrogen Application
- Authors:
- Matanović, Davorin (87510)
- Editors
- Pejčinović, Vladimir
Proceedings title: Zbornik radova VIII. međunarodni susret 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 workover
andmaintenance of wells is the application of nitrogen, a gas whichis the
most convenient for wellbore activities because of itsphysical and chemical
properties, economic advantages and safety.By application of nitrogen in
wellbore activities in workover andmaintenance two facts are substantial:
applicability in situationof workover when necessary activity cannot be
realised byclassical methods and, what is more important, realisation of
thesame activities much faster and less expensive than it can berealised by
classical methods.
Keywords: wellbore completion, workover, pressure, nitrogen, casing perforating, foam
- 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
Proceedings title: Zbornik radova VIII. međunarodnog susreta 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, perforating, gaseous drilling fluid, aerated drilling fluid
- 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 22nd Petroleum Itinerary Conference and Exhibition
Language: engleski
Place: Tihany, Mađarska
Year: 1993
Pages: from 1 to 11
Meeting: 22nd Petroleum Itinerary Conference and Exhibition
Held: from 10/06/93 to 10/09/93
Summary: The most frequent reason for killing production wells isa
necessity 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, killing fluids, brines
- Type of paper
: Paper in proceedings
Title: Achievements in Wellbore Completions and Workovers in
Croatia
- Authors:
- Matanović, Davorin (87510)
- Gaurina-Međimurec, Nediljka (98545)
- Forko, Stjepan
- Editors
- Gaurina-Međimurec, Nediljka (98545)
- Krilov, Zoran
- Rajković, Damir
- Vrkljan, Darko
- Zorić, Igor
Proceedings title: Zbornik radova simpozija "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 completion when considered in an overall
wellconstruction process is a complex one. It includes analysis ofthe well
purpose, collected data and assumption produced byvarious specialists whose
job is related to proper functioning ofthe well during its "life time". The
well completion carried outonce during the well utilization should be
considered ideal.Only, most often it is not possible to realise. Therefore,
it isnecessary to consider costs, equipment, and application ofproperly
timed procedures for keeping the continuity of wellproduction or injection
in advance. In this paper theaccomplishments in well completion in Croatia
are dealth 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
- 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: Particulars in production completion of gas wells
- Authors:
- Matanović, Davorin (87510)
- Editors
- Pejčinović, Vladimir
- Antolić, Josip
- Balagović, Mladen
Proceedings title: Zbornik radova IX. međunarodnog skupa 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 workowers.
Keywords: production wells,completion
- Type of paper
: Paper in proceedings
Title: Combination of tubing strings in gas wells completion
- 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 9
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 type can result with failure and recompletion expences.
Keywords: tubing,completion
- Type of paper
: Paper in proceedings
Title: Our expirience 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 gas 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
squeeye cementing operations to blow outs and well abandonment. In this
paper, causes of gas channeling, methods of gas channeling prevention, and
our experience in gas well cementing in Podravina region are described.
Keywords: gas channeling, cementing, gas wells, cement slurry
- Type of paper
: Paper in proceedings
Title: Borehole stability study with various formation cores and
inhibitive fluid samples
- Authors:
- Steiner, Ivo (44756)
- Gaurina-Međimurec, Nediljka (98545)
- Editors
- De Ghetto, Giovani
Proceedings title: Proceedings, offshore mediterranean conference 95
Language: engleski
Place: Ravena, Italija
Year: 1995
Pages: from 575 to 587
Meeting: Offshore Mediterranean Conference 95
Held: from 03/15/95 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 of 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: Some experiences in horizontal well drilling at gas
reservoirs
- Authors:
- Simon, Katarina (162761)
- 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 05/04/95 to 05/06/95
Summary: The paper discusses the planning abd 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 USA is given too.
Keywords: horizontal well,MWD system,mud
- Type of paper
: Paper in proceedings
Title: Soil pollution with hydrocarbons; determination,
consequences, sanation
- Authors:
- Muvrin, Boris (32911)
- 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 of sanation
measures using microorganisms. A methodology of experimental research and a
part of results in case of soil pollution were reviewed. Measurements were
done on original samples which were taken on small 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,microorganisms,sanation
- 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 structure 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: Technically Optimal Wells Drilling With the Aim to Achieve
Economical Recovery of Hydrocarbons
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: GAURINA-MEĐIMUREC NEDILJKA
Date of defense: 02/22/93
Language: hrvatski
Number of pages: 231
Summary: The major problem in drilling deep wells occurs when the
boreholestability is disturbed. There are two main causes of
boreholeinstability and they are of mechanical or physico-chemicalnature.
To complete this thesis it was necessary to: collect,observe and review the
pertinent literature, systematize themetodology to be used for preventing
the occurance of undesirablehole enlargement, carry out the dispersion test
to find the exactinteraction between fluids and shales for which core
samples oftwo wells as well as natural clay sample were used, and
establishthe precise technical improvement in deep wells drilling upon
theresults of above complex and thorough analyses.
Keywords: clay, borehole enlargement, borehole stability, shale, drilling fluid, dispersion
- 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: 03/01/95
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 Drava
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 for such 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 the
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, of labour and environment.
Keywords: casing design,well planning,casing setting depth,exploration well,pressure gradient,master-log
- Type of paper
: M.A.
Title: Trajectory control and measurements while drilling
horizontal wells
Faculty: Rudarsko-geološko-naftni u Zagrebu
Author: SIMON KATARINA
Date of defense: 02/10/94
Language: hrvatski
Number of pages: 98
Summary: The use of telemetris systems as a part of drilling
equipment when drilling a well enables collection of great number of data
about the well status, layer characteristics and well possition
underground. The most important is that we get data in the real time,
immediately. So we can make decisions about certain parametere that
influence the status of the well. This work emphasises the importance of
drilling path controlling, and measuring of geometrical, lithological and
production indicators. The conclusion is based on today standard use of
telemetric systems in horizontal drilling although they have been used only
few years. Capabilities of such systems are not jet finished so their use
is growing.
Keywords: telemetric systems,drilling path,horizontal drilling
- Type of paper
: Mentorship
Title: An Add to Optimization of Slush Pumps Piston Seals
Faculty: Rudarsko-geološko-naftni u Zagrebu
Date of defense: 11/16/92
Number of pages: 163
Author: Matanović docent Davorin
Degree level: Ph.D.
- Type of paper
: Mentorship
Title: Prognosis of small oil fiels environment pollution
Faculty: Rudarsko-geološko-naftni u Zagrebu
Date of defense: 12/29/93
Number of pages: 165
Author: Muvrin znanstveni asistent Boris
Degree level: Ph.D.