Oil and Gas Power Engineering https://nge.nung.edu.ua/index.php/nge <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> en-US ngejournal@nung.edu.ua (Андрій Петрович Джус (Andrii Dzhus)) ngejournal@nung.edu.ua (Рачкевич Руслан Володимирович (Ruslan Rachkevych)) Tue, 29 Dec 2020 00:00:00 +0200 OJS http://blogs.law.harvard.edu/tech/rss 60 Study of the efficiency of trapped gas displacement by non-hydrocarbon gases from water-flooded gas condensate reservoirs https://nge.nung.edu.ua/index.php/nge/article/view/534 <p><em>Analyzing industrial data and the results of theoretical studies, it was found that the natural gas recovery factor in water-drive gas reservoirs is about 50-60%. Considering the significant volumes of residual gas reserves trapped by formation water, there is a need to improve existing development technologies and search for optimal ways to increase hydrocarbon recovery under conditions of intensive water encroaching. Additional researches using hydrodynamic simulations were conducted in order to study the efficiency of enhanced recovery of residual gas reserves by injecting non-hydrocarbon gases into productive reservoirs. Based on the 3D reservoir model, the study of carbon dioxide and nitrogen injection into the initial gas-water contact was carried out in order to slow down the breakthrough of formation water into productive reservoir. The study was performed for different injection duration of carbon dioxide and nitrogen into productive reservoir. According to the results of the statistical processing of the calculated data, the optimal duration of the nitrogen injection was determined to be 8,04 months. The ultimate gas recovery factor for the optimal period of nitrogen injection is 58,11%. At the time of the carbon dioxide breakthrough into production wells, the optimal duration of the carbon dioxide injection was determined to be 16,32 months. The ultimate gas recovery factor for the optimal period of carbon dioxide injection is 61,98 %. Based on a comparative analysis of the efficiency of using various types of non-hydrocarbon gases as injection agents into productive reservoirs, the high efficiency of using carbon dioxide for injection into the initial gas-water contact was established. Due to the solubility of carbon dioxide in formation water, the ultimate gas recovery factor is significantly higher compared to using nitrogen as an injection agent.</em></p> S. V. Matkivskyi Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/534 Tue, 29 Dec 2020 00:00:00 +0200 Research basic parameters and justification of choice of gas injectors for alternative biogas fuel https://nge.nung.edu.ua/index.php/nge/article/view/528 <p><em>In connection with the trend of shortage of commercial fuels for engines in Ukraine and the world, the production of alternative fuels is developing, including biogas. The use of biogas fuel on a modern internal combustion engine equipped with gas equipment of 4-</em><em>5 generations can create a number of difficulties. This is due to the low heat of combustion of untreated biogas, the presence of moisture and the specifics of the operation of the nozzles. And, therefore, for the correct choice of nozzles, it is necessary to conduct a study and analysis of a number of basic indicators of their operation and, based on the data obtained, recommend their optimal parameters. In gas nozzles, as in gasoline ones, there are a number of important parameters on which stability and uniformity of engine operation, fuel consumption, reliability, etc. depend. These include: linear operation; nozzle reaction time; coil resistance; response time; ability to maintain factory performance; resource of work. For research, we selected nozzles of 4 generations of common manufacturers, namely: Matrix; Barracuda; Valtek; Hana; Keihin. In terms of linea-</em><em>rity, Valtek nozzles have low performance, and therefore use on engines can lead to increased biogas consumption, reduced engine performance and valve burnout. Keihin nozzles have high rates in this aspect of research, and therefore they will provide maximum efficiency of biogas combustion on the engine. High reaction time in Keihin nozzles. Barracuda nozzles are very close to working with Keihin, which means that their use will not impair engine performance. The factory characteristics of the nozzles, namely the coil resistance is the optimal Keihin nozzle, and the lowest values ​​in Valtek nozzles, the response (response) time of the Matrix, Hana and Keihin nozzles is quite close to 2 ms, which will provide quick response and wear, and the Barracuda and Valtek nozzles Keihin, Matrix and Barracuda nozzles provide the ability to maintain factory characteristics in the range from 2 to 5%, and the worst performance in Valtek is up to 20%, the service life of the nozzles, subject to timely servicing, is the largest Keihin nozzle, Matrix and Hana, which is from 200 to 250 thousand km, and the lowest indicator in Valtek and Matrix <br /></em><em>injectors is a resource from 70 to 100 thousand km. So, according to the results of the research, Keihin nozzles are recommended for use on engines in the process of their conversion to gas fuel. Their application will provide maximum efficiency and economy of the engine.</em></p> F. V. Kozak, V. М. Melnyk, V. М. Lototskyi Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/528 Wed, 30 Dec 2020 00:00:00 +0200 Improvement of classification of emulsion production methods https://nge.nung.edu.ua/index.php/nge/article/view/532 <p><em>When burning liquid fuel, the problems arise related to ensuring the environmental requirements and the efficiency of its use. The process of high-quality liquid fuel combustion (mainly fuel oil) is complicated by the presence of excess water in it. One of the promising directions for solving this problem is the use of water-emulsion fuels (WEF), in which the expensive stage of fuel dehydration is replaced by the stage of emulsification – the uniform water distribution in the volume of fuel. In this case, it is possible to eliminate its stratification not only with the use of expensive surfactants, but also with the use of technologies, ensuring the stability of such fuel due to the formation of a finely dispersed emulsion. The stability and efficiency of combustion of such a fuel emulsion (FE) will significantly depend on the amount and water dispersion in the WEF. Nowadays such WEF technologies for emulsifying and their features are insufficiently studied and therefore have great scientific and practical importance. The existing classifications of emulsification methods (EM) are diverse, which makes it impossible to analyze the possibilities, functionality, and practicability of choosing the optimal EM for obtaining a high-quality emulsion. On the basis of the analysis of the existing EM classifications, the improved classification is proposed, which combined the possible EM and devices. The expediency of using a specific EM depends on the parameters of the FE and its needs, scope, conditions and purpose of application. It is effective to use for an industrial scale the devices that work with discrete-pulse energy input technology (DPEI). However, you can use the sound EM, using the UZDN-A disperser and the UZG-34 generator for laboratory studies.</em></p> V. О. Melnyk Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/532 Tue, 22 Dec 2020 00:00:00 +0200 Improvement of the automatic control system of gas-pumping units taking into account their technical condition https://nge.nung.edu.ua/index.php/nge/article/view/547 <p><em>At the compressor stations (CS) of the gas transmission system (GTS) of Ukraine, 702 gas pumping units (GPU) have been installed, of which 20 types are gas turbine units, accounting for 76.7% of their total number. Each GPU is equipped with an automatic control system (ACS), which ensures its efficient operation. Today, more than 60% of GPUs, in particular of high power (25.0 MW), have worked out the installed service life, or those close to it. Their further operation does not ensure reliable and efficient operation, and therefore numerous failures and accidents occur, leading to significant economic losses. Considering that ACS were supplied together with the GPU, which are now morally obsolete and have practically exhausted their resource, the task of improving the ACS of the GPU, taking into account their technical condition, is urgent. The solution to this problem requires the integration of existing autonomous means of monitoring and diagnosing the technical state of the GPU into their ACS. The analysis of the known systems and means of diagnosing the technical state of the GPU from the point of view of the possibility of their integration into the existing ACS of the GPU is given. The possibility of using modern hardware and software, in particular the Siemens concern, in the development of a system for diagnosing the technical condition of the GPU-Ts-16S, as a component of its ACS, the results of testing which at the Dolinsky industrial site of the Bogorodchansky LPUMG have shown its effectiveness is shown. It is noted that the introduction of engineering solutions for the GPU type GTK-25-i, which allow extending the service life of its ACS, and replacing the old-style ACS with new ones does not lead to a significant increase in the reliability of the GPU. An example of the improvement of the ACS GPU type GTK-25-i on the KS-39 "V-P-V" of the Bogorodchansk LPUMG by equipping the GPU type GTK-25-i with additional sensors of technological and vibroacoustic parameters and upgrading the applied software, including algorithms for parametric, vibroacoustic diagnostics GPU type GTK-25-i and an algorithm for diagnosing its ACS. Long-term operation of the improved system has confirmed its effectiveness.</em></p> L. М. Zamikhovskyi, О. L. Zamikhovska , N. І. Ivaniuk, V. V. Pavlyk Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/547 Tue, 29 Dec 2020 00:00:00 +0200 Selection of low-resistant reservoir rocks in geological cross-section of Helvetian deposits at Letnianske field https://nge.nung.edu.ua/index.php/nge/article/view/535 <p> </p> <p><em>The main difficulties that arise in the selection of reservoirs in the geological section of the Helvetian deposits at Bilche-Volytska zone are due to the fact that they are characterized by low values of electrical resistivity. Under such conditions, very often, when interpreting the data of electrical and electromagnetic logging, gas-saturated reservoir rocks are characterized by increasing the penetration of filtrate into the formation and are mistakenly referred to as water-saturated rocks. Based on the analysis results of laboratory studies of the core material and data from geophysical well logging (GWL) in the geological section of Helvetian deposits at Letnianske field, two groups of reservoir rocks were identified. The first group of rocks belongs to the low-resistance, and the second - to the typical quartz sandstones. The formation of groups is due to the difference in electrical, radioactive and neutron attributes of reservoir rocks. According to the results of research it is established that the low resistance of Helvetian reservoir layers is caused by the electronic conductivity of pyrite and chlorite grains, which are part of the cementing material in rocks. Low indications of gamma radiation intensity radiation capture of thermal neutrons for low-resistance rocks are associated with high content of bound water in pyrite and chlorite minerals, and increased radioactivity is due to the content of zircon grains and high adsorption attributes of chlorite and clay masses. In order to increase the reliability of electric and electromagnetic logging data interpretation for the separation of reservoir rocks into typical and low-resistance quartz sandstones, it is proposed to use the comparison of the lateral logging curve (LL) with the normalized neutron gamma-ray logging (NGL) curve. The efficiency of proposed method for dividing reservoir rocks into groups was tested on actual material.</em></p> Ya. М. Koval, І. О. Fedak Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/535 Tue, 29 Dec 2020 00:00:00 +0200 Approbation of the tectonophysical model of fracture estimation at the deposits of the inner zone of the Precarpathian Foredeep https://nge.nung.edu.ua/index.php/nge/article/view/545 <p><em> </em></p> <p><em>A promising method for assessing the fracturing of reservoir rocks is the analysis of their stress-strain state by mathematical modeling of tectonophysical processes in the sandy-silty flysch strata. Previous studies were aimed at substantiating the main approaches to tectonophysical modeling of sandy-silty strata in order to assess the fracturing of oil and gas promising deposits. However, the developed model of the symmetric anticline cannot be used in the conditions of the Intristic zone of the Pre-Carpathian Foredeep due to the complex forms of layers. The model was improved and tested at such well-known deposits of the Inner Zone of the Pre-Carpathian Foredeep as Starosambir and Pivdenno-Hvizdetsk. A corresponding model for an asymmetric anticline with different layer thickness of the reservoir rock of the Yamna formation of the Paleocene of the Starosambir deposit has been constructed. The simulation results showed, that the zone of increased fracturing is located within the crest of the anticline. This statement is proved by field studies of the core. Increased fracturing within the cut area was not detected. The upper layer of sandstone of the menilite formation of the South Hvizdetsk deposit almost completely belongs to the fractured, pore-fractured type of reservoir. The question arose as to whether it was possible to explain such an abnormally large area of increased fracturing by the developed model. To solve the problem, the boundary conditions for reproducing the real deformation of the sandstone formation were improved. According to the results, the area of increased fracturing almost completely covers the layer. Thus, the results of approbation of the tectonophysical model within deposits of the Inner Zone of the Pre-Carpathian Foredeep indicate that with the help of the developed model it is possible to research complex structures on tectonic fracturing.</em></p> S. S. Kurovets, І. V. Artym, Т. V. Zderka Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/545 Sat, 26 Dec 2020 00:00:00 +0200 Investigation of hydrodynamic parameters and modernization of PDC drill bit elements https://nge.nung.edu.ua/index.php/nge/article/view/533 <p><em>The rapid development of well construction technologies is inherently associated with the improvement of the technology that is used in this case. Tools of a new generation - bits with diamond cutters (PDC) - are widely used, in which technical and economic indicators are significantly better than roller cone bits. Although their design is well developed, the issue of optimizing the operation parameters of jetting nozzles, the design features of which <br />determines the efficiency of well construction, remains relevant. Despite the effectiveness of the existing design of PDC bits, the study of hydrodynamic parameters was carried out using simulation modeling. Such a study makes it possible to assess the hydrodynamic parameters of the bit, develop recommendations for their improvement, which in turn will improve the efficiency of well construction in general. Computer programs designed for simulation of hydrodynamic processes make it possible to determine the necessary parameters with great reliability. However, the accuracy of the obtained result will depend not only on the settings of the grid of finite volumes, the number of iterations, but also on the initial data. Therefore, in the calculation model, in addition to the main parameters, such as the flow rate of the drilling fluid, the pressure at the bottom of the well, the bit rotation frequency, density, temperature and model of the drilling fluid viscosity, the roughness of the surfaces of both the bit and the walls, and the bottom of the well are taken into account. As a result of simulation, the drawbacks of the existing designs of PDC bits were identified, which can be eliminated using the proposed design of the jet nozzle, which: creates a large vorticity of the fluid flow, which positively affects the capture and removal of cuttings; makes it possible to regulate the direction of fluid movement (especially important for nozzles that are located farther from the bit axis), which will improve the removal of cuttings and, accordingly, will prevent it from re-entering the bottom</em></p> Ya. S. Biletskyi, Т. Ya. Shymko, І. Ya. Biletska, М. V. Seniushkovych, V. V. Mykhailiuk, R. О. Deineha Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/533 Tue, 29 Dec 2020 00:00:00 +0200 Analysis of the stress-deformed state of pipelines during plunging https://nge.nung.edu.ua/index.php/nge/article/view/538 <p><em>Recently, there has been a need to carry out work on deepening the pipeline (plunging) in some areas, where the depth of pipeline location was found to be inconsistent with the relevant standards. That is, pipelines during operation can be partially opened as a result of soil erosion, and they also tend to lose stability as a result of various factors (pressure, temperature, soil water content, etc.) and rise up (float). Also, the facts of laying pipelines in the process of their construction not to the design marks are known, due to the "low" construction conduct, that is, when the pipeline in some sections was in a trench, the depth of which did not correspond to the project. Further operation of such pipelines may be under the threat of the pipeline coming to the surface and mechanical damage to the insulation and the pipe body. Therefore, to ensure reliable operation of the pipeline, which has got raised sections, it is necessary to lower these sections to the design marks. To do this, it is necessary to develop equipment<br />and technology for repair work of this type. Therefore, the article considers two options for post-trenching<br />pipelines: lowering under its own weight without supporting and lowering with the maintenance of the pipeline by a supporting machine. For both methods of plunging, the stress-strain state of the pipeline was simulated during its lowering to the design level on the created mathematical model. An algorithm for calculating the geometric parameters of work performance, determining the stress state and checking the strength of the pipeline has been proposed.</em></p> <p> </p> V. B. Zapukhliak, Yu. H. Melnychenko, V. Ya. Hrudz, L. Ya. Poberezhnyi, Ya. V. Doroshenko Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/538 Tue, 29 Dec 2020 00:00:00 +0200 Investigation of the influence of corrosion defects on the durability of main oil pipelines https://nge.nung.edu.ua/index.php/nge/article/view/546 <p><em>For the sake of ensuring the energy security of Ukraine, the trouble-free operation of the oil transportation system becomes of strategic importance. The problem is exacerbated in connection with the long service life of individual objects of the system, which leads to degradation of the properties of the pipe material due to corrosive and erosion processes, which is enhanced by the effect of time-varying loads. Today, in world practice, various methods are used to strengthen defective sections of pipelines: installation of steel, plastic and fiberglass couplings, winding of an elastic composite tape, the use of reinforcing composite couplings, etc. To study the effect of microcracks, corrosion and erosion defects on the Druzhba oil pipeline of OJSC Ukrtransnafta with an installed bandage, full-scale tests of a defective section of a pipe (material - 17GS steel) reinforced with bandages made of a similar material using a UI1 / 200 GK installation were carried out. As a result of research, the pressure of its destruction was determined. During the tests, strain gauging was used to determine pipe deformations. Comparison of the values of stresses obtained experimentally and analytically confirmed that the use of bands on defective sections of the pipeline is an effective means for extending their service life. For a more accurate and detailed analysis of the reliability and durability of oil pipelines, a study of the defective parts (break point) cut from the pipeline was carried out. As a result of the studies carried out on the models - "cutouts", corrosion defects with a depth of up to 5 mm were registered, which is about 55% of the loss of metal, however, the pipe was not destroyed by these defects, but by a defect of the "crack" type. To obtain the profile of the defect from the model - "cutout", scanning was carried out using a sensor fixed on a mobile tripod connected to a computer via an ADC. At the next stage of research, the assessment of the residual resource was carried out using the analysis of full-scale kinetic curves of damage to hazardous sections of the oil pipeline through experimental studies of models - "cutouts". A fatigue curve has been constructed, which can later be used to predict the fatigue life of such elements. </em></p> V. М. Ivasiv, R. О. Deineha, О. Ya. Faflei, V. V. Mykhailiuk, V. V. Bui, R. M. Hovdiak Copyright (c) 2021 Oil and Gas Power Engineering https://creativecommons.org/licenses/by-sa/4.0 https://nge.nung.edu.ua/index.php/nge/article/view/546 Tue, 29 Dec 2020 00:00:00 +0200