Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas 2019-03-20T20:02:16+02:00 О.В. Паневник Open Journal Systems <p>The subjects of the “<strong>Scientific Bulletin</strong>” Journal deal&nbsp;with scientific production activities in the sphere of oil and gas industry complex and include&nbsp;the following sections:</p> <ul> <li class="show"><strong>Geology, prospecting and industrial geophysics of oil and gas fields</strong></li> <li class="show"><strong>Oil and gas engineering</strong></li> <li class="show"><strong>Machinery, equipment and supplies</strong></li> <li class="show"><strong>Transport and storage of oil and gas</strong></li> <li class="show"><strong>Measurement, control and technical diagnostics</strong></li> </ul> Determination of the perspective oil and gas bearing areas in the south-east part of Dnieper-Donetsk avlakogene and the basis of geophysical survey results application 2019-03-20T20:02:15+02:00 Yu. М. Zelenko <p><em>To ensure complete refusal of gas import by Ukraine, it is necessary to pay more attention to the search of <br> </em><em>unconventional sources of hydrocarbons and involve the territories previously considered insufficiently promising or unpromising. One of such promising gas-bearing fields is the south-eastern part of the Dniprovo-Donetskyi avlakogene (DDA).</em></p> <p><em>For the allocation of promising oil and gas bearing areas in south-east part of the DDA the author proposed to use the vitrinite reflectivity. </em><em>For some fields of DDA, the author calculated and developed graphs of vitrinite reflectivity gradient with depth value, the forecast map of the lateral and vertical distribution of the vitrinite reflectivity coefficient at 5 km depth was developed.</em></p> <p><em>According to the research results of geological structure in the south-east part of the DDA, preliminary estimates of kerogen catagenetic maturity were performed concerning generation and accumulation of hydrocarbons, in particular, in avlakogene consolidated fissured rocks.</em></p> <p><em>Determination methods of the organic substance content and prediction of gas-bearing perspective fine-grained clay-silty rocks with a high content of kerogen were considered by the complex of geophysical research methods.</em></p> 2018-03-23T00:00:00+02:00 ##submission.copyrightStatement## Poroperm properties of reservoir rocks at Kachalivske oil and gas condensate field 2019-03-20T20:02:14+02:00 V. V. Fedoriv Ya. M. Ftemov I. O. Piatkovska A. O. Trubenko <p>The results of laboratory, geological and geophysical research methods in Visean and Tournaisian reservoir rocks with complex type deposits of Kachalivske oil and gas condensate feild were analysed. The connection of structural and lithological characteristics with geophysical parameters was substantiated. In some cases, in the Visean and Tournaisian deposits, the multicomponent composition of the rock matrix affects the actual value of geophysical parameter, leading to erroneous conclusions about the reservoir, the nature of the saturation and depth of occurrence. As a result of the statistical processing of experimental laboratory studies and geophysical studies of wells in the Visean and Tournaisian deposits at Kachalivske oil and gas condensate feild, petrophysical models of reservoir rocks were developed allowing reliable determination of poroperm properties of such reservoir rocks. The developed models can be used both for determination the reservoir rock parameters and for quick interpretation of geophysical research results.</p> 2018-04-18T00:00:00+03:00 ##submission.copyrightStatement## Evaluation of the geological factors impact on capacity and filtration properties of terrigenuous reservoirs of the Pre-Carpathian foredeep 2019-03-20T20:02:13+02:00 S. S. Kurovets І. V. Artym <p>The following main geological factors that determine the reservoir properties of the terrigenous rocks of the Pre-Carpathian foredeep were identified, namely: mineral composition, structural and texture features, and thermobaric factors. The mineral composition of the rock-forming minerals, the shape, the size of the fragmented grains and pores, their mutual placement, the type of fluid and the thermodynamic state determine the reservoir properties of terrigenous rocks. The best reservoirs are sandstones, compiled with larger and sorted grains. The increase of clay and carbonate material sharply worsens the reservoir properties of rocks. Sealing and secondary processes (sieving, calcifying, pyrolysis) negatively affect the reservoir properties of rocks, reduce their porosity and permeability.</p> <p>Some dependencies were identified. These dependencies make it possible to predict the maximum porosity of sandstones, depending on their immersion in depth. The given porosity data of sandy-clayey rocks shows, that sorted quartz sandstones with insignificant contents of clayey and carbonate materials have greater intergranular porosity and permeability at great depths.</p> 2018-05-05T00:00:00+03:00 ##submission.copyrightStatement## Evaluation of the dynamic loads impact on the conditions of drill string failure during tripping operations 2019-03-20T20:02:16+02:00 O. Yu. Vytyaz R. S. Hrabovskyi V. V. Tyrlych V. I. Artym <p>The conditions of drill string failure during tripping operations with external or internal transverse annular cracks were defined. At the same time, considering the experimental evaluation of the force criterion for failure of metal of backup and operated drill string pipes, the interrelationship between the depth of the critical external or internal transverse annular cracks in drill string pipes with the weight of the drill string was established, considering the effect of dynamic loads during tripping operations. It was determined that dynamic loads during run-in-hole operations are more dangerous at depths of more than 3.7 km, while at lower depths, the dynamic loads occurring during pulling out of string are considered more dangerous. It was demonstrated that, when pulling out operated drill strings, internal transverse annular cracks at depths exceeding 1.1 km, are more dangerous than external ones, while at depths up to 1.1 km the external transverse cracks are more dangerous.</p> 2018-02-16T00:00:00+02:00 ##submission.copyrightStatement## Evaluation of carbonate-clay cement impact on the permeability factor of reservoir rocks by geophysical data 2019-03-20T20:02:15+02:00 T. V. Potiatynnyk <p>Control over the process of reservoir flooding provides an opportunity to conduct efficient and rational operation of hydrocarbon deposits. Detailed monitoring of the flooding process requires the creation of geologicalfiltration models. The basis of the reservoir filtration model is the permeability factor; its reliability depends on various factors. It was proved that the reliability of permeability factor determination of Hidnovytske field is significantly affected by carbonate content. The research to determine connection of the natural gamma field intensity with the radiation capture of neutrons intensity on the basis of geological and geophysical borehole survey of the Hidnovitske gas field was performed. The model of reservoir rock neutron properties reflects the hydrogen content in the pore space and the characteristic of the mineral composition of the reservoir rock cement. This characteristic makes it possible to use neutron gamma logging to evaluate the carbonate content impact in determining the permeability factor. To evaluate the carbonate content, it was suggested to use relative parameter G, indicating the part of the rock<br>dispersed fraction in the unit of hydrogen content. According to the results of laboratory measurements on core material and geophysical data of radioactive logging, the dependence of parameter G value on carbonate content&nbsp;was developed. The obtained dependence will allow to determine the proportion of carbonates in clay cement by parameter G value and correct the equation to determine the permeability factor.&nbsp;</p> 2018-03-28T00:00:00+03:00 ##submission.copyrightStatement## Research of the well efficiency improvement based on mathematical modeling 2019-03-20T20:02:12+02:00 V. Ya. Hrudz V. V. Marushchenko M. T. Savchuk O. O. Filipchuk <p>The important aspect of oil and gas production complex is stable operation of flooded gas and gas condensate wells.<br>This existing plunger lift designs were analyzed by the authors. The efficiency of plunger lifts in flooded and low-debit wells was determined. The facility for well internal tubing surface cleaning from liquid was developed. Based on mathematical model, the research of well efficiency improvement was performed. Based on calculations, the graphical dependence of the cleaning facility velocity on its position in the well tubing system. It was determined, that increase of liquid specific mass in the well tubing leads to decrease of the facility velocity. Based on the mathematical model, the patterns of the cleaning facility motion mode in well tubing were determined.</p> 2018-05-10T00:00:00+03:00 ##submission.copyrightStatement## Simulation of BHA sticking elimination effectiveness using jarring devices 2019-03-20T20:02:11+02:00 V. M. Charkovskyi M. М. Slepko <p>A stochastic mathematical model of the jarring device use effectiveness for releasing the stuck BHA was studied based on Monte-Carlo method of probability of the corresponding result. Distribution histograms were designed and the law of sticking force distributionp in various cases was defined. The conditions, when the probability of growth of the restraining force is unacceptably high were defined. The time of jarring and the number of impacts for probable tool release were defined using queuing theory elements. The results of laboratory research of strength properties of some Precarpathian rocks were given and approach for their accounting as criteria of rock destruction during jarring were proposed.</p> 2018-05-16T00:00:00+03:00 ##submission.copyrightStatement## Release of the stuck drill string by the method of frictional self-oscillations 2019-03-20T20:02:16+02:00 K. H. Levchuk <p>The mechanism of generation of forces, holding the drill pipes in case sludge sedimentation, caving in and collapse, as well as buckling and flow of plastic rocks, formation of oil seals was described. The modern ideas about friction forces were reviewed. A mathematical model of frictional self-oscillations for release a stuck drill string was developed. The necessity of application a vibration smoothing method of generating self-oscillations during emergency was substantiated. Using the computer program, parametric calculations of velocity change of the stuck drill pipe release were made. The author conducted numerical studies of the drilling line speed impact and oscillator frequency on the efficiency the sticking elimination process.</p> 2018-03-06T00:00:00+02:00 ##submission.copyrightStatement## Improvement and research of the pump rod treaded connections 2019-03-20T20:02:14+02:00 V. V. Mykhailiuk A. R. Yurych R. O. Deineha R. S. Kravchuk R. A. Pinchak B. V. Kharlamov <p>On the basis literary sources analysis, it was defined, that failures of the pump rod threaded connections are the most common exceed one-third of the total number of the rod string failures. It is due to non-uniform load distribution across thread turns of the pump rod threaded connections.</p> <p>The simulation modelling of standard design of pump rods was performed and graphic dependencies of stress distribution were developed on the gaps the pump rod threaded connections.</p> <p>The methods to reduce load non-uniformity across thread turns of the pump rod threaded connections were considered.</p> <p>The design of the pump rod connection was proposed; it shall have the variable mean diameter of the nipple thread by adding one more element, fitted in the nipple body hole.&nbsp; The comparison of stress distribution dependencies on the gaps the pump rod nipple of the standard and proposed design showed that stress decrease in the first gap of the thread turn by 60&nbsp; MPa, and in the third and next turns stresses increases and become uniform by the value. This change of stresses on turn gap, when it is operated in the well.</p> 2018-04-20T00:00:00+03:00 ##submission.copyrightStatement##