Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas 2020-07-27T12:35:27+03:00 В.В. Михайлюк Open Journal Systems <p>The subjects of the “<strong>Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas</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">Material mechanics;</li> <li class="show">Mechanical engineering;</li> <li class="show">Information programs and computer-integrated technologies.</li> </ul> Safety enhancement during deep well pump replacement 2020-05-04T15:17:31+03:00 Ya. Т. Fedorovych Tomasz Wydro М. V. Petriv О. І. Huhra V. V. Mykhailiuk <p><em>In Ukraine, as in other countries of the world, the majority of oil wells are operated using a mechanical method of production, such as rod well pumping method,</em> <em>containing above-ground and underground equipment. For repair or replacement of underground equipment (down hole pump), is brought to the surface. In this case, the well may have oil-water gas inflow caused by the «piston» effect, for example.</em> <em>(Substitution of volume between the pump and the pump rods by fluid from the formation). This could lead to an open flowing well.</em> <em>Many additional complex operations are used to perform safe well workover operations, such as well closure.</em> <em>These operations are performed to control well formation pressure, prevent gas-oil and damage to downhole equipment.</em> <em>It is also worth paying attention to the fact that disruptions in the process of well closure can lead both to a decrease in its productivity and to the complete termination of its operation.</em> <em>To prevent oil-water gas inflow various equipment and devices are used: Cameron ram-type blowout preventer, wellhead stuffing boxes, emergency washers with gate valves, downhole shutoffs, downhole check valves. All this increases safety when replacing downhole equipment, but does not guarantee the avoidance of additional complications in the operation of this equipment: the possibility of controlled shutdown of the well, recovery of oil production without performance of downhole operations, etc.</em> <em>To eliminate these complications, a downhole check valve design was developed. Its design allows: not to change the arrangement of elements in the well; to change the pump without well closure (it reduces repair time and costs); undercut tubing (does not allow the fluid from the formation to enter the well and create an emergency situation that could lead to open well flowing).</em></p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Development of the mathematical model for calculation of energy efficiency of mobile diesel compressor stations 2020-05-04T15:16:00+03:00 С. І. Kryshtopa L. І. Kryshtopa F. V. Kozak М. М. Hnyp І. М. Mykytii М. М. Tseber <p>The experience of development of domestic and foreign specialists in the sphere of energy loss reduction</p> <p>during gas cooling of mobile diesel compressor stations of the oil and gas industry is analyzed. The reason why the productivity of the compressors decreases after short period of operation, while the specific energy consump-tion increases. The disadvantages of existing cooling systems of compressed gas of mobile diesel compressor sta-tions are presented. Requirements for refrigerant coolants for compressor gas cooling systems are formulated. A reasonable choice of Freon R134a as a coolant for cooling of the compressed gas of the compressor stations is made. The structure and principle of operation of the system of high-efficiency reduction of temperature of the perspective system of cooling of compressed gas are presented. The tasks and basic assumptions of mathematical modeling of energy efficient scheme of gas cooling system are formulated. The purpose of this article is to investigate theoreti-cally the choice of coolant for a promising highly efficient system for cooling the compressed gas of mobile diesel compressor stations in the oil and gas industry. Inputs, outputs and general structure of mathematical model of multistage gas cooling of mobile diesel compressor stations are offered. The structure of the system of high-efficiency reduction of temperature of the perspective system of cooling of compressed gas and the principle of action are presented. The description and calculation formulas of the mathematical model of compressed gas cool-ing of mobile diesel compressor stations are given. When choosing a refrigerant with the condition of further use of the obtained energy, the main requirement was taken into account. The total specific energy costs for the opera-tion of the compressor installation according to the existing and perspective schemes and its energy efficiency indicators are determined.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Use of the of the least action principle for development of technological machine actuating mechanism 2020-05-01T15:25:59+03:00 М. Ya. Buchynskyi А. М. Cherniavskyi А. М. Buchynskyi <p>Any human activity is determined by the action of the fundamental laws of nature and its principles, including the universal law of nature, which is based on the principle of the least action. A number of researchers inter-pret the manifestation of this universal law of nature in economics as the principle of saving energy and time, ac-cording to which, any economic decision is evaluated using energy indicators. This principle concerns the results of human creativity in development of new technological machines, regulates the process of creating new technol-ogies and can significantly increase their effectiveness. After all, the principle of the least action determines the optimal functioning of any system, including the technical one, which is a technological machine. In the analysis of the actuators of technological machines, where there is a spatial movement of material objects, they use the equation of physics that describes the laws of change in the speed of movement of material flows, the conditions for their continuous operation, the pressure is formed, and so on. It means that the "action" is quantified. And the less actions performed by a technological machine to obtain a given result of a technological process there are, the more perfect it is. Guided by the definition of an action in the form of Maupertuis-Lagrange as the accumulat-ed doubled kinetic energy for a period of time or a change in position, a technique is proposed for a comparative assessment of the perfection of executive mechanisms of machines. And the smaller the action indicator is, the more solidly executed and more efficient the structure and design of the machine are, the more competitive it is, of other comparable conditions. The testing of the proposed methodology using several types of drilling technological machines as an example confirmed the reliability and appropriateness of application in assessing the perfection of machinery mechanisms. In particular, comparisons of models of a three-piston mud pump (older and newer high-tech production) and a technical drill string rotation system (rotary drilling system and drilling using a mod-ern top drive system) showed a high degree of improvement of new technological equipment. This proposed meth-odology to determine a single indicator of improvement of the actuating mechanisms of machines by the principle of the least action, complements and makes more multi-dimensional and reliable multi-criteria assessment of the mechanism, prospects and development trends of the class and type of technological machines under consideration.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Analysis of the causes of casing head in the oil and gas complex of Ukraine 2020-05-21T20:41:56+03:00 D. V. Rymchuk А. І. Kushch <p>The casing head is the main wellhead equipment of gas and oil wells. Column heads are installed on all wells, regardless of how they are operated. Anti-blowout equipment is installed on column heads during drilling, and fountain fittings are installed during well operation. They hang all the casing pipes lowered into the well. The design of the pillar trim provides the ability to: restore the integrity of annular space, flow in the packer space grease lubricant; crimping flange connections; monitoring and exploration of the medium pressure in the annular space; well cementing process. Violation of the column head reliability inevitably leads to serious accidents, damage to the environment, and in some cases may cause fires, explosions, accidents. The article classifies column bindings that are used in the oil and gas complex of Ukraine, according to the design of nodes for sealing inter-column heads. The causes of column head leaks of all groups are determined. The conditions of column head sealing are described. The causes of rubber aging are determined. The effect of casing string parameters on the casing head tightness is shown. Regulatory documents, describing the procedure and rules for selection, installation and oper-ation of column heads at operational oil and gas wells and wells in underground gas storage are analyzed. The analysis of modern casing heads showed that the main sealing elements of the annular space are rubber parts made of rubber. Measures to improve the column head reliability are proposed.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Study and modernization of the mud pump valve unit design 2020-04-21T22:11:42+03:00 І. F. Kontsur V. V. Mykhailiuk R. О. Deineha О. Ya. Faflei D. S. Repalo V. V. Stanovych <p>Piston drilling pumps, the main part of which is hydraulic, are widely used in the process of drilling wells for oil and gas. It determines the efficiency, reliability and durability of the pump in general. In recent years, the depth of drilling wells in Ukraine and abroad has increased, which requires the use of more powerful drilling pumps and is accompanied by increased operating pressures. The load on the hydraulic part increases, and this has a negative effect on the operation of the valve assemblies of the pump. Valves are one of the most responsible and fast-wearing units in the hydraulic part of the drilling pump. The frequency of maintenance of the pump de-pends on their resource. Analysis of drill pump valve designs and operating conditions showed that despite the wide range, their service life remains quite low. Therefore, there is a need for further studies of valve designs and their moderniza-tion. It is known that one of the reasons that leads to the destruction of the valve parts is the ingress of abrasive particles from the flushing fluid into the gap between the plate and the seat. This accelerates the destruction of the cuff first, and then the valve. To avoid this phenomenon, it is proposed to use an improved valve design, the inner surface of the sealing sleeve of which is cylindrical. The cuff of this design will be deformed in the vertical direc-tion, without forming a gap with the valve plate. To confirm the operability of the proposed design of the cuff, a three-dimensional model of the valve was built and a simulation study was conducted. The results of this study confirmed the effectiveness of this design and a significant increase in the life of the valve assembly.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Develop simulation library of pulley tackle mechanisms for drilling systems 2020-05-16T13:31:48+03:00 О. О. Slabyi І. V. Tsidylo <p>The article considers issues of approaches to modeling spatial and planar pulley-block mechanisms in com-ponent-based hierarchical modeling systems for analysis of their stable and transient functional modes in the time domain. To do this, the analysis of developed models of pulley systems in existing works and justification of impos-sible use of the modeling approaches during synthesis of models of pulley-block systems of arbitrary structures in component- based modeling media are performed. Based on this, an alternative approach to the development of pulley-block, systems based on the principles of free, declarative, component- based modeling language Modelica is proposed. Using the typical design of a spatial pulley-block mechanism as an example, the order of its decompo-sition into individual components and subsequent aggregation from these components of the simulation model is considered. Separately, the main structural components, used to build models of tackle mechanisms of drilling systems are considered: a cable section, a block, a plug and winches, and mathematical models of their work are designed. The laws of combining these components with each other and the synthesis procedure of simulation models of the operation of block mechanisms of arbitrary design are described. Separate issues are considered regarding the determination of the length of the cable section, combining two spatially located blocks, as well as checking the adequacy of the synthesized simulation model. Based on the proposed approaches and mathematical models, a “Wire” modeling library was developed in Modelica language, which can be used to build simulation models of pulley-block mechanisms of drilling systems and an example of its use when creating a simulation model of a single riser wire tensioner is presented.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Effect of corrosivity on environment on the residual corrosion rate of steel in the specified range of protective potentials 2020-05-05T14:21:03+03:00 L. І. Nyrkova S. О. Osadchuk А. V. Klymenko <p><em>Studies’ results of the effect of environment’s corrosivity on residual corrosion of carbon steel in specified by DSTU 4219 range of protective potentials is presented. It is shown that this index depends on a number of factors – the polarization potential, the duration of the test and pH. It was demonstrated the decreasing of residual corrosion rate with increasing (in absolute value) of protection potential for environments with pH in the range from 5.6 to 9.6. It is shown that under the same protective potential for 8 hours in these environments, the residual corrosion rate of steel is different. At a minimum potential of -0.75 V in the environment with low acidic and strongly alkaline pH (5.6 and 9.6, respectively) the protective effect (i.e. a decrease of the corrosion rate to the values less than 0.01 mm/year) not achieved. The minimum values of corrosion rates, which are setting are 0,021 0,040 mm/year, and the conditions for the flying of local corrosion can create. In slightly alkaline environment (pH of 8.2) the protective effect achieved at the potential -0,72 V, and minimum protective potential the cathodic protection is effective. With the increase of the duration of investigations up to 1 month in all environments the protective effect achieved at the minimum protection potential, and under it increasing (in absolute value) decomposition of an aqueous solution, accompanied by hydrogen recovery.</em> <em>The rate of residual corrosion in solutions with different pH varies with time: through a short test time (near 8 hours) decreases nonlinearly with increasing the test time (up to 1 month) – a complex dependence on the potential with the minimum values in the area of alkaline pH is observed.</em></p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Study on geometric features of conical threads 2020-05-04T15:14:33+03:00 І. P. Taras T. O. Pryhorovska <p>The article studies the problem of oil/gas pipe conical thread reinforcement; in particular, the geometrical fundamentals for tool design for reinforcement. The article considers the main types of conical threads for pipes used in oil/gas industry. It was determined, that to obtain initial data for tools, used to reinforce thread crest and flank, it is necessary to consider conical threads not only as helical lines, but also as helicoid surfaces, to determine what helicoid parameters make the thread conical and obtain relations for the calculation of these geometric parameters. The authors determined geometrical parameters of conical threads and design parameters to develop rollers with deformed protrusions for simultaneous reinforcement of aforementioned thread crests and flank to improve tools for their frictional reinforcement. It was stated, that contrary to cylindrical threads, helicoid’s angles of inclination, which form conical threads, differ not only by the angle of inclination to the plane normal to their axes, but also by the values. The study of conical thread geometrical features refers to a cylindrical one allows to use these features in the design or improvement of tools for its manufacture and/or reinforcement. This approach allows improving the tools for frictional reinforcement of conical locking threads by modifying the lateral deforming elements. It makes possible to simplify tool manufacture, increase tool durability, reinforce the conical thread surface, and improve the quality, performance and economy of the conical thread frictional reinforcement.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Development of the structural model of the life cycle of a part by means of the technological inheritance mechanics 2020-05-05T08:39:22+03:00 Ya. М. Kusyi О. V. Lychak О. R. Onysko <p>The priority of the quality improving of machine parts, providing their operational characteristics and specified reliability parameters during the design of oil and gas and mechenical engineering equipment was established. The dominance of the criterion of technological inheritability for all stages of the Life Cycle of a Part was noted. The current state of providing of the quality parameters of a part and its operational characteristics by means of the technological inheritabilty was analyzed. Algorithms for technological providing of quality parameters, operational characteristics and reliability indicators of parts are considered. Approaches for estimation of the degree of material degradation, worked-out and anticipated (residual) part lifetime were described. Object, subject and research tasks were installed. The deformation and energy criteria for evaluation of degree of material damageability are presented. The specificity of SADT-technology for the analysis and synthesis of the technological processes is described and the advantages, disadvantages, scope of its application are noted. A systematic approach for the joint using of continuum media mechanics, continuous damage mechanics and fracture mechanics is proposed. During the study of the process of metal plastic molding in a certain focus of deformation the properties of the surface layer are considered as a the result of this molding. And the process of part exploitation are considered as the continuing the change of these properties. That approach allows to use the parameters of the deformation mechanics as the degree of shear deformation  and the degree of exhaustion of the plasticity reserve  for the analysis of physical phenomena. The Life Cycle of a Part is analyzed as an integrated process of exhaustion of the metal plasticity stock under the influence of the specified load programs in according to the technological inheritability of its properties. An advanced structural model of the Life Cycle of a Part by means of the technological inheritability mechanics is offered.</p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas Construction of a generalized hardening curve for isotropic plastic metal materials 2020-05-04T15:10:42+03:00 H. V. Kozbur H. V. Kozbur О. К. Shkodzinsky І. R. Kozbur <p>One of the main ways to increase reliability and at the same time reduce the materials consumption of pipes under pressure, used in the oil and gas transportation system, is to improve theoretical and computational meth-ods to predict critical loads in their walls. These studies are based on the problem of accuracy and reliability of calculations at the stage of determination of mechanical characteristics of structural materials. Prediction of ul-timate stresses and strains in the material is performed by approximation of experimental data using deformation curves or yield strenghth. The purpose of the work is to propose a universal way to obtain a generalized curve for better consistence with the experimental data for each specific material. The paper describes a method used to develop a one-parameter model of a generalized deformation curve for plastic metal materials. To obtain the parameter p value as a constant of the material, it is necessary to have the results of several simple biaxial tension experiments with various combinations of the principal stress ratios. For the most accurate calculation of constant material p, it is required to minimize the effect of errors at preparation, testing and result processing stages. The model verifi-cation for other materials and selection of additional quality indicators will allow satisfactory accuracy to describe the generalized deformation curve and predict the stress-strain state of the material. In combination with the methods for structural geometry, the obtained generalized curve can be used to predict the real stress values in pipe walls under pressure.</p> <p> </p> 2020-07-27T00:00:00+03:00 Copyright (c) 2020 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas