Oil and Gas Power Engineering 2021-12-29T00:00:00+02:00 Андрій Петрович Джус (Andrii Dzhus) Open Journal Systems <p>The journal publishes materials based on the results of scientific and productive activity in the field of oil and gas complex in the following directions:</p> <p>Geology, exploration and geophysics of oil and gas fields</p> <p>Scientific and technical problems of petroleum engineering</p> <p>Materials, structures and equipment of petroleum complex facilities</p> <p>New solutions in modern equipment and technology</p> Conditions of formation of oil deposits in flysch sediments at the north-western part of the Pre-Carpathian foredeep 2021-11-23T12:17:51+02:00 М. І. Мaniuk V. R. Khomyn О. R. Мaniuk V. М. Мaniuk <p><em>The research has shown that in the Inner Zone of the Pre-Carpathian foredeep as a whole and the Boryslav oil field in particular, oil and gas condensate fields are located naturally due to the spread of deep faults within. </em><em>It is established that oil and gas deposits of fields represent a set of sand lenses within a certain complex of flysch rocks, the increased oil saturation of which is associated with fracture. </em><em>The obtained results showed that the oil deposits in Boryslav sandstone have a lenticular structure, and the high productivity of wells is associated with the vein form of hydrocarbons in the sand layers. </em><em>In order to determine the nature of productivity Boryslav sandstone, we modeled a map of integrated oil production from deposits in Boryslav sandstone from Boryslavska deep fold, which shows all the wells that opened this layer. </em><em>It is established that</em><em> in the area, which covers only 0.8 of the area of Boryslav sandstone (eastern part of the field), from the wells that exploit it, extracted 15% of the total oil production from the Boryslavske field as a whole. At the same time, the distance between the most productive wells is only 110 m. Also, on the same site between high-performance wells at a distance of only 50-100 m there were also those in which from Boryslav sandstone oil inflows were not received at all. It is characteristic that industrial inflows of oil are received from small intervals (1-2 m) in the cross-section of 20-30 m of a powerful sandy horizon. The intervals of tides could be both in the roof and in the plantar part or in the middle part of the formation. While in some areas and even in the vaulted part of the folds (theoretically the most promising for anticlinal folds) tides are not obtained at all. </em><em>We believe that for effective exploration of Boryslav oil field it is necessary to change its methodological basis. Namely, exploration wells must be drilled based on the location of wells that gave an industrial influx of oil, placing them gradually at short distances.</em></p> <p><em>.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Reliability of results of use of complex geophysical studies in the process of control of development of oil and gas deposits 2021-11-23T12:19:15+02:00 D. D. Fedoryshyn О. М. Trubenko S. D. Fedoryshyn А. О. Trubenko <p><em>The paper considers modern methods for determining the position of gas-liquid contacts in terrigenous deposits at oil and gas condensate fields in Ukraine. The results of laboratory studies of a representative core collection (87 samples) in the petrophysical laboratory of IFNTUOG made it possible to establish the reservoir parameters and lithological characteristics of reservoir rocks of Carboniferous and Neogene sediments, which made it possible to reliably estimate the reservoir parameters of productive formations. The results of well studies, in particular, obtained during the isolation of oil and gas-saturated reservoir rocks and monitoring the dynamics of changes in oil-water and gas-water contacts, made it possible to form an optimal informative complex of geophysical methods for effective prospecting and development of oil and gas fields. Direct studies of the identified reservoir rocks made it possible to establish that the geological sections of the Jurassic, Cretaceous and Neogene systems of prospecting areas are filled with both hydrophilic and hydrophobic lithotypes of rocks, which have different effects on the readings of electrical and radioactive methods. Reasonably, the maximum value of the electrical resistivity, the maximum oil saturation coefficient (Кo), as well as the minimum value of the water saturation coefficient (Кw), which is typical for oil and gas-saturated formations, must correspond to the condition for displaying these parameters in completely water-saturated rocks. In this case, the boundary of the transition zone will be displayed by the bottom of the maximum radio-saturated layer and the top of the aquifer in this rock. Confirmation of the above is seen from the fragments of geophysical data processing, electrical and neutron studies in the presence of low and high salinity, drilling fluids and drilling fluids. The analysis of the efficiency of using the methods of pulsed neutron-neutron logging (PNNL) and neutron gamma-ray logging (NGL) when monitoring the change in the position of the GLC to prevent watering of productive formations is carried out. According to the research results, it is proposed to use a complex of nuclear physical methods in the process of monitoring the dynamics of changes in NWC, in particular, neutron gamma logging, repeated neutron logging, as well as in the process of drilling conducting electrical methods of imaginary resistance and unauthorized potentials.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering Comparative evaluation of the executive mechanism of the balancing drive of the rocking machine equipped with a long-running stand 2021-11-23T12:16:36+02:00 V. R. Kharun V. M. Senchishak V. Ya. Popovych І. І. Shostakivskyi <p><em>The article studies long-running drive of a downhole rod pumping unit, the design of which combines a traditional two-arm balancing drive (rocking machine) and a long-running stand. Modern downhole rod pumping units can extract oil, usually from one or two layers of wells up to 3500 m deep with a liquid flow rate from a cubic meter to several hundred cubic meters per day. It is investigated that the characteristics of balancing drives, performed by a number of world manufacturers allow the usage of pumping equipment in the range of fluid flow rate from the well from 1 to 40 m3 day.</em><em> There is a general global trend of reducing the oil wells’ flow, as most oil fields are in the late stage of development, and therefore most traditional rocking machines are operated with low efficiency. Because the vast majority of of Ukrainian oil-production enterprises’ wells are equipped with beam pumping units their replacement by other types of the downhole rod pumps' drives requires significant investments. Equipping of a traditional balancing drive </em><em>with a long-travel stand can improve drive’s technical characteristics. Determination of the design changes’ influence on kinematic and dynamic characteristics has been performed for two balancing options: 1 – traditional balancing of the drive with crank counterweights, placed on the cranks of the rocking machine in combination with a long-running stand and 2 – when the balance drive is used only to convert movement of a rope suspension bracket, and counterweights are placed on a long-running stand. It has been calculated that the first balancing </em><em>variant allows to reduce the maximum torque </em><em>up to 27.7 %, and by the counterweights placing on a long-running stand, the reduction of the maximum torque can be up to 62 %. It is proposed to use the standard deviation of the torque as a criterion for assessing the quality of balance.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Research of carbon fiber plastic rod connections with steel heads at the action of bending loads 2021-12-20T09:44:51+02:00 B. V. Kopeу V. V. Myhailuk B. M. Bakun <p><em>To increase the efficiency of the use of a sucker rod pumping unit (SRPU) today the columns of sucker rods of fiberglass and carbon fiber are used. Such polymer composites have a number of advantages over steel, but they have a significant drawback in the design of a sucker rod - a high concentration of stresses at the point where theyare connected to a steel head containing a thread. Many constructive solutions to this problem have been developed, but maintaining the connection of a fiberglass or carbon-plastic barrel with a metal head remains quite a challenge. As practice shows, the bending of the pump rods in the well are also subjected to bending loads, torque, friction to the column of tubing (tubing) and the like. Therefore, a comparative analysis of the parts of the pump rod structures: traditional steel and combined (metal tip with composite rod) should be carried out. In this work, such joints were subjected only to bending loads, which are particularly dangerous when passing through a rod of bent sections of a well and when running down the bar. It is established that at the time of bending the maximum normal stresses are distributed along the length of the pump rod unevenly and are concentrated in the transition between the head and the rod. The maximum normal stresses occurring in the transition between the steel tip and the carbon-plastic core, which are jointed without structural features (galtels, different transitions, etc.), have been determined to be greater than 1600 MPa. Such value of stress is undesirable when cycling the connection in well. For example, the design of a metal head was proposed, which allows reducing the stresses arising from bending and distribute them on the connection more evenly, compared to the traditional sucker rod.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering The technology of cleaning tubing from hydrate-resin-paraffin deposits 2021-11-23T14:33:05+02:00 V. D. Makarenko A. V. Liashenko О. Yu. Vytyaz <p><em>During the operation of oil and gas wells there is a constant decline in production. The reason may be various factors, such as the reduction of the internal space of the tubing due to the deposition of hydrate-paraffins, asphaltenes, resins and mineral salts. To prevent and clean these deposits, various control methods are used: the use of special coatings on the inner surface of the pipes, the introduction into the pumped stream of various chemical <br /></em><em>reagents, sonication, magnetic treatment, mechanical methods, etc. However, some of them are considered inefficient, economically unprofitable or quickly fail.That is why an improved design of a device for cleaning the inner surface of tubings of oil and gas wells was proposed. The device refers to the equipment of the oil and gas industry, namely as a mechanism for restoring the internal space of well pumps. Calculations for the design of cleaning <br /></em><em>devices for different diameters of tubing are given. Kinetic calculations of the movement of the cleaning mill in tubing pipes under the action of hydraulic forces were performed. Based on the obtained equations, in the process of design development, the dimensions and shapes of the working (main) and additional (reverse) cutters were calculated, the masses and strength characteristics of structural elements (pins, traverse, cable, bolted joints, etc.) were selected. Provided the necessary rigidity and reliability of the entire cleaning device. Thus, the proposed design developments in combination with the previously known will allow to obtain a new positive effect, which is to improve the quality of cleaning of tubing. Industrial tests of the developed design on objects showed significant advantages in comparison with domestic and foreign analogs.</em></p> <p><em> </em></p> <p> </p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering Estimation of energy efficiency potential of electric drive pumping units in steady operating modes 2021-12-07T12:48:35+02:00 I. I. Yaremak Ya. V. Batsala R. О. Yaremak <p><em>According to the results of studies of steady operation modes of electric pumping units of Ukrainian oil pumping stations, have been identified the main reasons of efficiency decrease of their performance during operation. It is determined that the normative documents regulating the efficient operation of pumping units of the main oil pipelines of Ukraine need to be improved. The assessment of energy efficiency potential of the main pumping unit on the example of pump НМ-3600-230 with synchronous electric drive СТД-2500-2 is carried out and the main ways to increase the efficiency of electricity use at oil pumping stations of main oil pipelines are analyzed. A complex mathematical-graphic model of a centrifugal pump and a synchronous electric motor is used to determine the parameters of the process of energy consumption and energy use of hydraulic and electrical subsystems of the pump unit, which allowed to take into account possible changes in equipment characteristics and modes of operation. The value of the relative specific consumption of electricity for pumping of working fluid for regulated and unregulated electric drive based on a complex electro-hydraulic model of the main pump was calculated, which allowed to promptly recalculate the characteristics of the centrifugal pump and electric motor taking into account their technical condition and to determine the potential of the pumping unit. It is determined that an effective way to reduce energy consumption by main pumping units is applying of a controlled electric drive at oil pumping stations, but the feasibility of such a measure requires additional technical and economical calculations. It is determined that to increase the efficiency of pumping units is necessary to avoid low flow-duty modes, to form maps of main oil pipelines in a way to ensure optimal in terms of energy efficiency operation modes of electro-hydraulic equipment of oil pumping stations and to change operation mode of pump and motor in terms of their technical condition.</em></p> <p><em> </em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering Analysis of the work of steps using the eccentricity limiter for drilling wells with a diameter of 393,7 mm 2021-12-09T14:56:29+02:00 I. V. Voievidko А. І. Riznychuk V. V. Tokaruk I. Yu. Piruh <p><em>Based on the results of the analysis of theoretical and practical studies of drilling large diameter boreholes, a method is proposed for designing the bottom hole assembly with two rock cutting tools, taking into account geological and technical factors that influence the formation of the well trajectory. Prospects for controlling the direction of the wellbore are substantiated using the limiter of the eccentricity value. The calculation of double-hole assemblies of the bottom of the drill string with different diameters of eccentricity limiters, allowing to achieve eccentricities of 10 mm, 20 mm, 30 mm and 40 mm has been performed. The analysis of the operation of the mentioned bottom hole assemblies when drilling a well to a depth of 900 m is carried out. The analysis is carried out in the field of construction of deep boreholes of large diameter and the efficiency of drilling a pilot hole of a smaller diameter with simultaneous formation of the final diameter using a reamer is substantiated. A brief analysis of modern foreign and domestic studies and publications related to the expansion of the pilot wellbore is presented, as well as the influence of the expansion eccentricity on the elastic-deformation state of the BHA and, as a result, on the deviation of the well is considered. A conclusion is made about the possibility of using the phenomenon of eccentric expansion to control the trajectory of the wellbore. </em><em>The graphical dependences of the change in the intensity of the borehole deviation during deepening using the eccentricity of the limiter for a specific BHA, including a bit with a diameter of 295.3 mm and a reamer with a size of 393.7 mm, are shown. It is shown that with this type of arrangement at different values ​​of eccentricities, it is possible to achieve the intensity of borehole curvature in the range from 0 deg/10 m to 0.44 deg/100 m, 0075, indicating a change in the direction and magnitude of eccentricity during drilling. The graphical dependences of the change in the zenith angle of the well when deepening it for the assembly of the bottom of the drill string with different diameters of the eccentricity limiter are given. The graphical dependencies indicate that when using stops of different sizes, which make it possible to control the eccentric displacement of the reamer at the final drilling depth of a section of 500 m, it is possible to reduce the increase in the zenith angle of the well from 17.5 degrees to 10 degrees. It is concluded that by using the limiters of the eccentric displacement of the expander relative to the pilot borehole, it is possible to control the deviation of the well during the construction of conditionally vertical and inclined sections.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Technologies for capturing carbon dioxide and prospects of its utilization in depleted oil and gas fields 2021-12-02T12:49:21+02:00 S. V. Matkivskyi <p><em>The problem of global warming and climate change requires global efforts to reduce the negative impact on the atmosphere. Capturing carbon dioxide is a key strategy in achieving pollution reduction targets. Reducing air pollution can be achieved by reducing the share of fossil fuels in the energy balance, introducing technologies for generating electricity from renewable sources and increasing the energy efficiency of production. An important step towards decarbonization is the introduction of carbon dioxide capture technologies in large industrial plants. These technologies involve capturing carbon dioxide during the combustion of coal or gas and transporting it to a disposal site with its subsequent storage without contact with the atmosphere. The most common technologies are post-combustion, pre-combustion, and combustion of oxygen-enriched fuels for carbon dioxide capture. Carbon dioxide emitted from flue gases can be used commercially, as a raw material for the food and chemical industries. A promi</em><em>-</em><em>sing direction for the utilization of large volumes of carbon dioxide is its injection into depleted oil and gas fields in order to increase the recovery factors of hydrocarbons. Using the main tools of hydrodynamic modeling, studies were carried out to increase hydrocarbon recovery of the Hadyach oil and gas condensate field in the conditions of the manifestation of a water drive. Based on the results of the studies carried out, it was found that in the case of introducing the technology of injecting carbon dioxide into the reservoir of the V-16 horizon, an increase in the final gas recovery factor is achieved by 2.95%, and condensate - by 1.24% of the residual hydrocarbon reserves. The results of the studies carried out indicate significant prospects for the use of carbon dioxide in the oil and gas sector of Ukraine within the framework of the entire process of decarbonization of energy-intensive production.</em></p> <p><em> </em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Hydraulic flow mixing model 2021-11-09T20:16:09+02:00 D. О. Panevnyk О. V. Panevnyk о <p><em>Based on the theory of a flooded jet moving in a concomitant flow, a hydraulic model of the downhole jet pump working process in the form of a central potential and coaxial annular flows is proposed. In the process of building a hydraulic model, the geometric dimensions of the elements of the flow part of the jet pump and the ratio of the costs of the working and ejected flow of the downhole ejection system are taken into account. The central potential flow is characterized by a constant velocity profile. Peripheral shear annular flow is characterized by an uneven distribution of kinematic parameters and can be approximated by elementary functions. The proposed velocity profile in the annular boundary layer maintains the approximate self-similarity throughout the initial section </em><em>of theworking flow of the jet pump. To characterize the non-uniform distribution of kinematic parameters in the mixing chamber of the jet pump, the ratio of the average and maximum speed of the mixed flows is used. In the process of integration of the proposed velocity profiles, an analytical dependence is obtained, which connects the generalized coefficient of non-uniformity of distribution of kinematic parameters in the mixing chamber of the jet pump with the characteristics of the downhole ejection system. According to the obtained analytical dependence, the value of the coefficient of non-uniformity of the distribution of kinematic parameters is directly proportional to the distance between the working nozzle and the mixing chamber of the jet pump. The proposed model of velocity distribution in the inlet section of the mixing chamber allows to reduce the error of analytical determination of the jet pump pressure and increase the efficiency of designing the operating parameters of the well ejection system.</em></p> <p><em> </em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Principles of rational management of unstable regimes in complex gas transportation systems 2021-11-04T21:04:08+02:00 V. Ya. Hrudz Ya. V. Hrudz R. V. Tereshchenko О. Т. Chernova R. B. Stasyuk <p><em>The problem of choosing the rational control of non-stationary processes in complex gas transmission systems caused by instability of loading in the conditions of limited volume of gas transit is considered. Control effects in such conditions must ensure the transfer of the object from one point of the functional phase space to another, maintaining its specified state under different perturbing effects while fulfilling the condition of minimum total costs. The results of analytical studies of the nature of the flow and duration of non-stationary processes in complex gas transmission systems caused by the exclusion from the mode of operation of individual compressor stations are presented. A mathematical model of the gas pipeline is constructed taking into account the influence of compressor stations on the basis of classical equations of gas flow energy and continuity using the functions of the Dirac source. The implementation of the created mathematical model by applying the integral Fourier and Laplace transforms allowed to obtain in analytical form the dependence that reflects the law of fluctuations in time of mass flow of gas in the initial and final cross section of the pipeline. The constructed dependences of the gas transmission system productivity trend at its beginning and end showed the influence of compressor station placement in the gas transmission system, in particular its serial number on the route number, on the nature of the nonstationary process caused by its shutdown, in particular on the nonstationarity duration. These tasks are the main tasks of operational optimal management of gas transport through main gas pipelines, which allows to solve the problem of uninterrupted supply of gas consumers. For optimal control problems, an algorithm of the method of step variations is proposed, according to which variations of inlet pressure and flow are localized, ie taken as constants at this step, and change of control function mainly affects only outlet pressure. systems, especially if they are not fully loaded.</em></p> <p><em> </em></p> <p> </p> 2021-12-29T00:00:00+02:00 Copyright (c) 2022 Oil and Gas Power Engineering Efficiency of hydrogen use in mixtures with compressed natural gas on car engines 2021-12-08T10:12:12+02:00 V. М. Melnyk F. V. Kozak М. М. Hnyp D. V. Lisafin <p><em>One of the important aspects of using hydrogen in an equivalent fuel is economic efficiency. In the calculations of the economic efficiency of the use of hydrogen as an additive to compressed natural gas, the necessary technical condition is to ensure the same calorific value of the equivalent fuel in comparison with commercial natural gas. To solve this problem, we obtained the dependence of the change in the price of natural gas on the lower heat of combustion, calculated the change in the consumption of equivalent fuel from the equation of heat balance contained in compressed natural gas and equivalent fuel. Depending on the increase in the lower heat of combustion when adding hydrogen, we obtained the value of the heat of combustion of compressed gas that can be used in mixtures with hydrogen. Therefore, for the accepted prices for compressed natural gas and hydrogen and under the same calorific value of equivalent fuel and compressed natural gas from the calculations it is seen that with increasing percentage of hydrogen in fuel mixtures of natural gas and hydrogen increases economic efficiency. This is due to the use in fuel mixtures of natural gas with low calorific value, and hence low cost, and as an option it can be biogas. When using hydrogen additives to compressed natural gas with low calorific value in the amount of up to 70% by weight, you can achieve a reduction in the cost of natural gas to 12.5 UAH on kilogram. This effect, when using hydrogen additives to natural gas, indicates the prospects of this direction of hydrogen use and the feasibility of further research.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering Mathematical modeling of the energy reduction system in the lifting transmission units of lifting installations for well repair 2021-11-04T21:01:36+02:00 S. І. Kryshtopa L. І. Kryshtopa І. М. Mykytii М. М. Hnyp F. V. Kozak <p><em>The work is aimed at solving the problem of reducing energy losses in transmission units of hoisting installations for repairing wells. A method of rapid heating and maintaining the optimal temperature in the transmission units of lifting units by using the heat of the exhaust gases was proposed. The analysis of features of a design of transmissions of lifting installations for repair of wells is carried out. Studies of viscosity-temperature characteristics of modern transmission oils and temperature regime in transmission units have been performed. A mathematical model of energy release in transmission units during the operation of lifting units is proposed. Installed energy consumption for friction in the gears of the transmission units. Friction energy losses in bearings of </em><em>transmission mechanisms of lifting units are determined. A method for reducing energy losses in transmission units of hoisting installations for well repair is proposed. Experimental studies of the implementation of the proposed method of reducing energy losses in transmission units have been performed. The dependence of power losses in the gearbox of lifting units depending on the temperature and grade of transmission oil is established. The dependence of power losses in the gearbox of the lifting unit of the UPA 60 / 80A model depending on the temperature and grade of transmission oil is obtained. The results of calculations of fuel consumption in the gearbox of the lifting unit of the UPA 60 / 80A model with different power drives and at different temperatures of transmission oil are given.</em></p> 2021-12-29T00:00:00+02:00 Copyright (c) 2021 Oil and Gas Power Engineering