Pub Date : 2020-08-31DOI: 10.31471/1993-9973-2020-2(75)-24-31
O. Y. Faflei, R. О. Deynega, V. Mykhailiuk, A. Semenchuk, B. I. Zvir
The process of the oil field operation at the late stage is characterized by a significant content of mechanical impurities in the extracted raw materials and a high rate of water encroachment. Water encroachment plays a sig-nificant role in the processes of formation sand carry-over and the destruction of incompetent rocks of productive horizons in deposits. Today, to intensify the drainage of formation fluid from production wells, it is necessary to increase the depth of descent and to use more productive pumps. However, this leads to the growth of the draw down pressure and, as a rule, to more intensive sloughing of mechanical impurities out of the reservoir. First of all, the sand taken out of the formation is a highly abrasive agent, which causes the wear not only of the pump elements, but also of the tubings, valves, throttles, etc. Predicting the impact of mechanical impurities on the ele-ments of the pumping equipment for oil production is a complex task that requires consideration of many different factors. The sand which is carried out of wells is accumulated in the pipelines. Besides, it is accumulated in meas-uring units, separators, valves and other parts of group metering and pumping units. Process tanks and reservoirs at oil or condensate treatment plants are clogged with sand. To combat sloughing of sand, in most cases the meth-od of filtration is used. This method is not the most effective, but it is reliable, low cost, and environmentally friendly. Several constructions of downhole filters are analyzed. To evaluate the efficiency of the downhole filter, its research is carried out using simulation modeling. The dependence of the number of sloughed particles on their diameter is established in accordance with the hydrodynamic processes and characteristics of the working envi-ronment.
{"title":"Evaluation of well screen efficiency using Simulation","authors":"O. Y. Faflei, R. О. Deynega, V. Mykhailiuk, A. Semenchuk, B. I. Zvir","doi":"10.31471/1993-9973-2020-2(75)-24-31","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-24-31","url":null,"abstract":"The process of the oil field operation at the late stage is characterized by a significant content of mechanical impurities in the extracted raw materials and a high rate of water encroachment. Water encroachment plays a sig-nificant role in the processes of formation sand carry-over and the destruction of incompetent rocks of productive horizons in deposits. Today, to intensify the drainage of formation fluid from production wells, it is necessary to increase the depth of descent and to use more productive pumps. However, this leads to the growth of the draw down pressure and, as a rule, to more intensive sloughing of mechanical impurities out of the reservoir. First of all, the sand taken out of the formation is a highly abrasive agent, which causes the wear not only of the pump elements, but also of the tubings, valves, throttles, etc. Predicting the impact of mechanical impurities on the ele-ments of the pumping equipment for oil production is a complex task that requires consideration of many different factors. The sand which is carried out of wells is accumulated in the pipelines. Besides, it is accumulated in meas-uring units, separators, valves and other parts of group metering and pumping units. Process tanks and reservoirs at oil or condensate treatment plants are clogged with sand. To combat sloughing of sand, in most cases the meth-od of filtration is used. This method is not the most effective, but it is reliable, low cost, and environmentally friendly. Several constructions of downhole filters are analyzed. To evaluate the efficiency of the downhole filter, its research is carried out using simulation modeling. The dependence of the number of sloughed particles on their diameter is established in accordance with the hydrodynamic processes and characteristics of the working envi-ronment.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"1 16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127978109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.31471/1993-9973-2020-2(75)-7-15
V. Grudz, T. Tutko, O. Dubei
The problem of forced oscillations of an open section of a gas pipeline during the cleaning piston passage belongs to the type of problems of forced oscillations of one-dimensional elastic objects under the influence of a moving inertial load on them. Currently, there are two ways to solve such problems. The first way is related to the integration of the partial differential equation and the solution of such problems is a superposition of eigen-oscillations and accompanying oscillations. The second way does not involve the integration of the partial dif-ferential equation. Methods of generalized coordinates, generalized displacements and various numerical methods belong to the second type of solving. None of the mentioned methods is simple. Therefore, the authors suggest the method, in which the first mathematical model provides the determination of forced oscillations of the gas pipeline section during the passage of the cleaning piston without taking into account its inertial load on the gas pipeline. In future, on the basis of the first model it is planned to develop the second mathematical model which will provide an approximate determination of the deflections of the pipeline axis, taking into account the inertial load of the piston on the pipeline. The purpose of this article is to obtain a solution to the problem of forced oscillations of the pipeline section during the passage of the cleaning piston without taking into account the inertial forces on the pipeline. The problem is solved by partial differential equation, Fourier method is applied. The right side of the non-homogeneous differential equation is decomposed into an infinite series, which is the sum of the produc-tions of the eigenfunctions of the pipeline section free oscillations and the unknown function of time. After finding out this function, the authors determine the unknown time function in the Fourier method and hence the solution of the problem in the form of an infinite series, the summands of which lessen rapidly. The authors calculate the deflections of the pipeline axis along the entire section of the gas pipeline for different points of time, as well as deflections of individual sections changing in time and moments of deflection.
{"title":"Forced oscillations of the main gas pipeline open section during the cleaning piston passage","authors":"V. Grudz, T. Tutko, O. Dubei","doi":"10.31471/1993-9973-2020-2(75)-7-15","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-7-15","url":null,"abstract":"The problem of forced oscillations of an open section of a gas pipeline during the cleaning piston passage belongs to the type of problems of forced oscillations of one-dimensional elastic objects under the influence of a moving inertial load on them. Currently, there are two ways to solve such problems. The first way is related to the integration of the partial differential equation and the solution of such problems is a superposition of eigen-oscillations and accompanying oscillations. The second way does not involve the integration of the partial dif-ferential equation. Methods of generalized coordinates, generalized displacements and various numerical methods belong to the second type of solving. None of the mentioned methods is simple. Therefore, the authors suggest the method, in which the first mathematical model provides the determination of forced oscillations of the gas pipeline section during the passage of the cleaning piston without taking into account its inertial load on the gas pipeline. In future, on the basis of the first model it is planned to develop the second mathematical model which will provide an approximate determination of the deflections of the pipeline axis, taking into account the inertial load of the piston on the pipeline. The purpose of this article is to obtain a solution to the problem of forced oscillations of the pipeline section during the passage of the cleaning piston without taking into account the inertial forces on the pipeline. The problem is solved by partial differential equation, Fourier method is applied. The right side of the non-homogeneous differential equation is decomposed into an infinite series, which is the sum of the produc-tions of the eigenfunctions of the pipeline section free oscillations and the unknown function of time. After finding out this function, the authors determine the unknown time function in the Fourier method and hence the solution of the problem in the form of an infinite series, the summands of which lessen rapidly. The authors calculate the deflections of the pipeline axis along the entire section of the gas pipeline for different points of time, as well as deflections of individual sections changing in time and moments of deflection.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116838163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-43-51
S. Matkivskyi, S. Kovalchuk, O. Burachok, O. Kondrat, L. Khaidarova
Охарактеризовано вплив водонапірної системи на характер залежності приведеного середнього пластового тиску від накопиченого видобутку газу з родовища. Зроблено припущення, що незначний вплив законтурної водоносної частини покладу не впливає на характер залежності приведеного середнього пластового тиску від накопиченого видобутку газу, і характер цієї залежності повною мірою характеризує газовий режим розробки покладу. Використання матеріального балансу в такому випадку призводить до завищення початкових запасів газу, оскільки в процесі впровадження певного об'єму води в продуктивну газонасичену частину покладу частково компенсує зниження пластового тиску внаслідок відбору газу. Таким чином, не знаючи достовірних початкових запасів газу, неможливо раціонально проектувати систему розробки та надавати рекомендації щодо вдосконалення системи розробки родовища, що потребує значних капіталов-кладень. Для підтвердження цього припущення створено синтетичну тривимірну модель газового покладу. Створена 3D модель газового покладу включає в себе об'єм води нижче газоводяного контакту, який обме-жений розмірами моделі та додатково з метою проведення комплексного аналізу використано аналітичний акюфер Фетковича об’ємом 5 млн м3 та 25 млн м3 відповідно, з однаковим індексом продуктивності. Акюфери підключені до межі моделі з південно-східного напрямку. За результатами проведених досліджень на основі створеної 3D моделі здійснено графоаналітичну оцінку дренованих запасів газу. Аналізуючи отри-мані результати, автори повною мірою підтвердили зроблене припущення, про те, що незначний вплив во-донапірної системи не пливає на характер залежності приведеного середнього пластового тиску від нако-пиченого видобутку газу з родовища. За результатами проведених досліджень зроблено оцінку можливої величини похибки, яка допускається в результаті оцінки запасів газу за методом падіння пластового тиску. Згідно результатів моделювання розробки родовища величина похибки може складати до 19,47% від дос-товірних початкових запасів газу в моделі. Дане відхилення суттєво перевищує допустимі межі і може призвести до прийняття неправильних рішень щодо подальшої розробки родовища.
{"title":"Research of the water-pressure system small show influence on the material balance reliability","authors":"S. Matkivskyi, S. Kovalchuk, O. Burachok, O. Kondrat, L. Khaidarova","doi":"10.31471/1993-9973-2020-2(75)-43-51","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-43-51","url":null,"abstract":"Охарактеризовано вплив водонапірної системи на характер залежності приведеного середнього пластового тиску від накопиченого видобутку газу з родовища. Зроблено припущення, що незначний вплив законтурної водоносної частини покладу не впливає на характер залежності приведеного середнього пластового тиску від накопиченого видобутку газу, і характер цієї залежності повною мірою характеризує газовий режим розробки покладу. Використання матеріального балансу в такому випадку призводить до завищення початкових запасів газу, оскільки в процесі впровадження певного об'єму води в продуктивну газонасичену частину покладу частково компенсує зниження пластового тиску внаслідок відбору газу. Таким чином, не знаючи достовірних початкових запасів газу, неможливо раціонально проектувати систему розробки та надавати рекомендації щодо вдосконалення системи розробки родовища, що потребує значних капіталов-кладень. Для підтвердження цього припущення створено синтетичну тривимірну модель газового покладу. Створена 3D модель газового покладу включає в себе об'єм води нижче газоводяного контакту, який обме-жений розмірами моделі та додатково з метою проведення комплексного аналізу використано аналітичний акюфер Фетковича об’ємом 5 млн м3 та 25 млн м3 відповідно, з однаковим індексом продуктивності. Акюфери підключені до межі моделі з південно-східного напрямку. За результатами проведених досліджень на основі створеної 3D моделі здійснено графоаналітичну оцінку дренованих запасів газу. Аналізуючи отри-мані результати, автори повною мірою підтвердили зроблене припущення, про те, що незначний вплив во-донапірної системи не пливає на характер залежності приведеного середнього пластового тиску від нако-пиченого видобутку газу з родовища. За результатами проведених досліджень зроблено оцінку можливої величини похибки, яка допускається в результаті оцінки запасів газу за методом падіння пластового тиску. Згідно результатів моделювання розробки родовища величина похибки може складати до 19,47% від дос-товірних початкових запасів газу в моделі. Дане відхилення суттєво перевищує допустимі межі і може призвести до прийняття неправильних рішень щодо подальшої розробки родовища.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116018719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-52-61
V. Vytvytskyi, A. Y. Karvatskyi, I. Mikulionok, O. Sokolskyi
The use of a mathematical model of discrete motion of bulk material were justified for movement of polymer granules in the working channel of feeding zone of the screw extruder as a set of particles moving relative to each other based on the Discrete Element Method taking into account the influence of the shape and the size of polymer granules on their tribological properties on the example of the problem of forming the angle of repose. The study of the interaction among the granules of the following four polymers has been conducted: high-density polyeth-ylene of brand Marlex HHM 5502BN (HDPE), copolymer of ethylene with vinyl acetate (sevilene) of brand 11104-030(CEV), polystyrene of brand Denka Styrol MW-1-301 (PS), polyvinyl chloride of brand SorVyl G 2171/9005 11/01 (PVC), which are selected because they are widely used in industry and at the same time differ from each other in shape, size and physical and mechanical characteristics. The Hertz-Mindlin viscoelastic model was used to de-scribe the interaction between granules, which assumes that the sphere-shaped particles do not deform upon con-tact and overlap each other by a predetermined amount, forming a contact patch. The study was carried out in the EDEM software package. The calculation results for the formation of an angle of repose of natural methods and numerical experiment were given with the two approaches to modeling the shape of pellets were analyzed: the consideration in the form of granules in the form of spheres and in the form of multisphere, when the calculated shape of the pellets as close to real. The results of the calculations on the formation of the angle of repose prove that the discrete motion model of bulk material based on the discrete element method when using the form of gran-ules close to real better reproduces the behavior of bulk materials compared to spherical granules.
以休止角形成问题为例，考虑聚合物颗粒的形状和尺寸对其摩擦学性能的影响，以离散元法为基础，将聚合物颗粒作为一组相对运动的颗粒在螺杆挤出机进料区工作通道内运动的数学模型进行了验证。本文研究了以下四种聚合物颗粒之间的相互作用:选用品牌为Marlex HHM 55020亿的高密度聚乙烯(HDPE)、品牌为11104-030的乙烯与醋酸乙烯共聚物(sevilene) (CEV)、品牌为Denka Styrol MW-1-301的聚苯乙烯(PS)、品牌为SorVyl G 2171/9005 11/01的聚氯乙烯(PVC)，因为它们在工业上应用广泛，同时在形状、尺寸和物理机械特性上各不相同。采用Hertz-Mindlin粘弹性模型描述颗粒之间的相互作用，该模型假设球形颗粒在接触时不变形，并以预定的数量相互重叠，形成一个接触斑块。研究在EDEM软件包中进行。给出了自然方法和数值实验的休止角形成的计算结果，并分析了两种球团形状建模方法:在计算出的球团形状尽可能接近真实情况下，以球团形式和多球形式考虑球团形状。休止角形成的计算结果证明，与球形颗粒相比，采用更接近真实的颗粒形式时，基于离散元法的块体材料离散运动模型能更好地再现块体材料的运动行为。
{"title":"Research of the polymer granules shape and size influence on their tribological properties","authors":"V. Vytvytskyi, A. Y. Karvatskyi, I. Mikulionok, O. Sokolskyi","doi":"10.31471/1993-9973-2020-2(75)-52-61","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-52-61","url":null,"abstract":"The use of a mathematical model of discrete motion of bulk material were justified for movement of polymer granules in the working channel of feeding zone of the screw extruder as a set of particles moving relative to each other based on the Discrete Element Method taking into account the influence of the shape and the size of polymer granules on their tribological properties on the example of the problem of forming the angle of repose. The study of the interaction among the granules of the following four polymers has been conducted: high-density polyeth-ylene of brand Marlex HHM 5502BN (HDPE), copolymer of ethylene with vinyl acetate (sevilene) of brand 11104-030(CEV), polystyrene of brand Denka Styrol MW-1-301 (PS), polyvinyl chloride of brand SorVyl G 2171/9005 11/01 (PVC), which are selected because they are widely used in industry and at the same time differ from each other in shape, size and physical and mechanical characteristics. The Hertz-Mindlin viscoelastic model was used to de-scribe the interaction between granules, which assumes that the sphere-shaped particles do not deform upon con-tact and overlap each other by a predetermined amount, forming a contact patch. The study was carried out in the EDEM software package. The calculation results for the formation of an angle of repose of natural methods and numerical experiment were given with the two approaches to modeling the shape of pellets were analyzed: the consideration in the form of granules in the form of spheres and in the form of multisphere, when the calculated shape of the pellets as close to real. The results of the calculations on the formation of the angle of repose prove that the discrete motion model of bulk material based on the discrete element method when using the form of gran-ules close to real better reproduces the behavior of bulk materials compared to spherical granules.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130371961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-69-77
S. Kurovets, E. Chornyi
The prediction of the phase state of hydrocarbons at great depths in the area of high temperatures and pressures is of particular relevance today. The peculiarity of the current forecasts is that the pressure-and-temperature conditions of the occurrence and the physical parameters of the reservoir oils are considered as combined average values in a single, integral Inner Zone of the Pre-Carpathian Depression. The specificity of changing each of them is also the same and is forced to extend to the entire territory of the zone. The article considers an important issue of substantiation of a new, more detailed forecast. It is necessary to be able to pre-dict the basic characteristics and phase state of reservoir oils depending on the depth of occurrence in different parts of the Inner Zone. The article considers the possibility of determining the physical parameters of formation hydrocarbon fluids by grapho-analytical method only when there are results of the research of wells at steady and unstable regimes. The developed method allows to quickly determine the set of physical parameters of reservoir oils: saturation pressure, overpressure value, gas content, average gas solubility coefficient, reservoir density, volume factor and oil shrinkage, conversion shrinkage factor, compressibility and thermal expansion factor, the distribution of fluid mass into liquid and gas phases under standard surface conditions and under the condition of fluid evaporation. The calculated equations are based on the use of universal thermodynamic quantity – the molecular weight of the hydrocarbon system. Being the function of only this component composition of the system, the molecular weight does not depend on pressure and temperature. This method allows to estimate the opera-tional stocks of fluids immediately after receiving industrial inflows in the first well, i.e. before the complex of laboratory studies.
{"title":"Determination and prediction of reservoir oil physical parameters by semigraphical method for the Inner zone of Carpathian Foredeep","authors":"S. Kurovets, E. Chornyi","doi":"10.31471/1993-9973-2020-2(75)-69-77","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-69-77","url":null,"abstract":"The prediction of the phase state of hydrocarbons at great depths in the area of high temperatures and pressures is of particular relevance today. The peculiarity of the current forecasts is that the pressure-and-temperature conditions of the occurrence and the physical parameters of the reservoir oils are considered as combined average values in a single, integral Inner Zone of the Pre-Carpathian Depression. The specificity of changing each of them is also the same and is forced to extend to the entire territory of the zone. The article considers an important issue of substantiation of a new, more detailed forecast. It is necessary to be able to pre-dict the basic characteristics and phase state of reservoir oils depending on the depth of occurrence in different parts of the Inner Zone. The article considers the possibility of determining the physical parameters of formation hydrocarbon fluids by grapho-analytical method only when there are results of the research of wells at steady and unstable regimes. The developed method allows to quickly determine the set of physical parameters of reservoir oils: saturation pressure, overpressure value, gas content, average gas solubility coefficient, reservoir density, volume factor and oil shrinkage, conversion shrinkage factor, compressibility and thermal expansion factor, the distribution of fluid mass into liquid and gas phases under standard surface conditions and under the condition of fluid evaporation. The calculated equations are based on the use of universal thermodynamic quantity – the molecular weight of the hydrocarbon system. Being the function of only this component composition of the system, the molecular weight does not depend on pressure and temperature. This method allows to estimate the opera-tional stocks of fluids immediately after receiving industrial inflows in the first well, i.e. before the complex of laboratory studies.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127150740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-78-87
O. Oliinyk, S. Vyzhva, V. Antoniuk, I. Bezrodna
The world achievements of the study of carbonate reservoir rocks with secondary voids have been analyzed. An integrated approach to the study of this type of reservoir has been demonstrated on the example of reservoir rocks of the Visean strata of the South-Berestivske field in the North-Western part of the Dnipro-Donets Basin. The purpose of this article is to predict the reservoir filtration-capacitive properties, as well as oil saturation characte-ristics of complex carbonate reservoir rocks using well logging data. To solve this problem, an integrat-ed approach is used. It includes the methods of porosities balance and functional transformations (normalization) of the electrical and radioactive well logging curves (lateral logging - neutron gamma ray logging, impulse neu-tron-neutron logging - neutron gamma ray logging). As a result, the authors have identified intervals in the Visean carbonate deposits with cavernous voids and cracks. Each individual geophysical method is influenced by the structure of the void space. Due to this, when calculating the porosity coefficient for different probes, the au-thors identify intervals represented by carbonate deposits, mainly of the porous-cavernous type. However, there is an interval of 4287.6-4289.6 m of porous-cavernous-fractured type. It is established that in the selected layers the coefficients of different types of porosity are: secondary - 2.5-6%, cavernous - 1.7-5% and fracture -0.2%. The thickness of pro-ductive sediments varies within 0.8 - 2.4 m (the average value is 2 m). The authors also substantiated the choice of parameters when calculating the saturation coefficient in complex structural reservoirs. Moreover, it is noted that the reservoir properties are provided by the presence of secondary voids, namely the cavities through which the fluid is filtered, and the rock matrix is compacted, poor-porous and low-permeable.
{"title":"Prediction of filtration and capacitive properties and oil saturation characteristics of complex structure carbonate reservoirs (on the example of the Northwestern part of DDB)","authors":"O. Oliinyk, S. Vyzhva, V. Antoniuk, I. Bezrodna","doi":"10.31471/1993-9973-2020-2(75)-78-87","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-78-87","url":null,"abstract":"The world achievements of the study of carbonate reservoir rocks with secondary voids have been analyzed. An integrated approach to the study of this type of reservoir has been demonstrated on the example of reservoir rocks of the Visean strata of the South-Berestivske field in the North-Western part of the Dnipro-Donets Basin. The purpose of this article is to predict the reservoir filtration-capacitive properties, as well as oil saturation characte-ristics of complex carbonate reservoir rocks using well logging data. To solve this problem, an integrat-ed approach is used. It includes the methods of porosities balance and functional transformations (normalization) of the electrical and radioactive well logging curves (lateral logging - neutron gamma ray logging, impulse neu-tron-neutron logging - neutron gamma ray logging). As a result, the authors have identified intervals in the Visean carbonate deposits with cavernous voids and cracks. Each individual geophysical method is influenced by the structure of the void space. Due to this, when calculating the porosity coefficient for different probes, the au-thors identify intervals represented by carbonate deposits, mainly of the porous-cavernous type. However, there is an interval of 4287.6-4289.6 m of porous-cavernous-fractured type. It is established that in the selected layers the coefficients of different types of porosity are: secondary - 2.5-6%, cavernous - 1.7-5% and fracture -0.2%. The thickness of pro-ductive sediments varies within 0.8 - 2.4 m (the average value is 2 m). The authors also substantiated the choice of parameters when calculating the saturation coefficient in complex structural reservoirs. Moreover, it is noted that the reservoir properties are provided by the presence of secondary voids, namely the cavities through which the fluid is filtered, and the rock matrix is compacted, poor-porous and low-permeable.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131444660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-62-68
I. Chudyk, I. Dudych, V. Tokaruk
The study of the influence of technical and technological factors on the efficiency of well flushing was car-ried out under experimental conditions. The analysis of existing experimental installations is performed with the help of which it is possible to assess the influence of technical and technological factors on the process of well flushing. The laboratory facility for modeling the well flushing process was designed using similarity criteria ob-tained in accordance with the basic provisions of the theory of dimensions. The developed installation allows you to model and study the influence of many factors on the well flushing process due to its compact overall dimen-sions and ease of conducting experiments, namely: the eccentric placement of the drill string; the type of flushing fluid (rheological properties); the size of the rock fraction; the frequency of pulsations to create a pulsating char-acter of the fluid movement; rotation of the drill string; longitudinal movement of the drill string. The main factors of influence and the range of their changes on the efficiency of sludge transportation are determined on the basis of previous studies. An experiment plan is constructed to study the significance of factors on the quality of sludge removal from the well bore using the «Taguchi» plan. Data processing was performed in the software «Mathcad Prime». Variations in factors lead to an improvement in the quality of well flushing, by reducing the area of sludge settling in the wellbore. The flow rate of the washing liquid has the most positive effect on the removal of sludge. The size of the rock fraction and the longitudinal movement of the drill string has the least impact. Pulsa-tion of the washing liquid has a significant impact on the quality of sludge removal, which is a significant and interesting factor from the point of view of further scientific research.
{"title":"Well washing process modelling","authors":"I. Chudyk, I. Dudych, V. Tokaruk","doi":"10.31471/1993-9973-2020-2(75)-62-68","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-62-68","url":null,"abstract":"The study of the influence of technical and technological factors on the efficiency of well flushing was car-ried out under experimental conditions. The analysis of existing experimental installations is performed with the help of which it is possible to assess the influence of technical and technological factors on the process of well flushing. The laboratory facility for modeling the well flushing process was designed using similarity criteria ob-tained in accordance with the basic provisions of the theory of dimensions. The developed installation allows you to model and study the influence of many factors on the well flushing process due to its compact overall dimen-sions and ease of conducting experiments, namely: the eccentric placement of the drill string; the type of flushing fluid (rheological properties); the size of the rock fraction; the frequency of pulsations to create a pulsating char-acter of the fluid movement; rotation of the drill string; longitudinal movement of the drill string. The main factors of influence and the range of their changes on the efficiency of sludge transportation are determined on the basis of previous studies. An experiment plan is constructed to study the significance of factors on the quality of sludge removal from the well bore using the «Taguchi» plan. Data processing was performed in the software «Mathcad Prime». Variations in factors lead to an improvement in the quality of well flushing, by reducing the area of sludge settling in the wellbore. The flow rate of the washing liquid has the most positive effect on the removal of sludge. The size of the rock fraction and the longitudinal movement of the drill string has the least impact. Pulsa-tion of the washing liquid has a significant impact on the quality of sludge removal, which is a significant and interesting factor from the point of view of further scientific research.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123399245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31471/1993-9973-2020-2(75)-88-97
O. Vytyaz, R. Hrabovskyi, V. Artym, V. Tyrlych, N. Hrabovska
The cause of failures in the elements of the drill string when drilling deep wells is the occurrence and development of crack-like defects in the cross section. The generalized data of defectoscopy of long-term operated drill pipes conducted at the Ukrburgaz drilling rigs from 2015 to 2017, as well as numerous literature data show that such defects are formed at the bottom of corrosion ulcers that occur during operation under the influence of workloads and drilling fluids, in particular during tripping operations, both on the inner and outer surfaces of the drill pipe. During the tripping operations, under the influence of tensile loads, they being developed go up to the surface of the drill pipe, forming scouring, which ultimately leads to the destruction of the pipe. Using known analytical solutions, the stress state in the vicinity of the semieliptic crack located on both the outer and inner surfaces of the hollow cylinder under axial load was estimated and the corresponding stress intensity coefficients at the crack tip of these defects were determined. To predict the limit state of a drill pipe with a semieliptic crack, the analysis of crack parameters reflecting the local stress-strain state near the crack tip is performed. Using the finite-element method, the stress state around the vertex of the semieliptic crack was determined and on this basis the characteristics of fracture mechanics were calculated: J – integral and stress intensity coefficients. Diagrams of fracture risk assessment in the coordinates "depth of crack-like defect - depth of drilling - stress intensity factor" are offered, which make it possible to estimate the safe depth of both internal and external semieliptic crack-like defects detected by technical diagnostics taking into account results of experimental investigations of critical crack resintance. The admissible sizes of the studied defects depending on the depth of drilling are determined.
{"title":"Numerical and experimental assessment of the long-operated drill pipes destruction conditions","authors":"O. Vytyaz, R. Hrabovskyi, V. Artym, V. Tyrlych, N. Hrabovska","doi":"10.31471/1993-9973-2020-2(75)-88-97","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-2(75)-88-97","url":null,"abstract":"The cause of failures in the elements of the drill string when drilling deep wells is the occurrence and development of crack-like defects in the cross section. The generalized data of defectoscopy of long-term operated drill pipes conducted at the Ukrburgaz drilling rigs from 2015 to 2017, as well as numerous literature data show that such defects are formed at the bottom of corrosion ulcers that occur during operation under the influence of workloads and drilling fluids, in particular during tripping operations, both on the inner and outer surfaces of the drill pipe. During the tripping operations, under the influence of tensile loads, they being developed go up to the surface of the drill pipe, forming scouring, which ultimately leads to the destruction of the pipe. Using known analytical solutions, the stress state in the vicinity of the semieliptic crack located on both the outer and inner surfaces of the hollow cylinder under axial load was estimated and the corresponding stress intensity coefficients at the crack tip of these defects were determined. To predict the limit state of a drill pipe with a semieliptic crack, the analysis of crack parameters reflecting the local stress-strain state near the crack tip is performed. Using the finite-element method, the stress state around the vertex of the semieliptic crack was determined and on this basis the characteristics of fracture mechanics were calculated: J – integral and stress intensity coefficients. Diagrams of fracture risk assessment in the coordinates \"depth of crack-like defect - depth of drilling - stress intensity factor\" are offered, which make it possible to estimate the safe depth of both internal and external semieliptic crack-like defects detected by technical diagnostics taking into account results of experimental investigations of critical crack resintance. The admissible sizes of the studied defects depending on the depth of drilling are determined.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133833306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-02DOI: 10.31471/1993-9973-2020-1(74)-82-88
О. V. Burachok, D. Pershyn, S. Matkivskyi, Ye. S. Bikman Ye. S. Bikman, О. Kondrat
The article characterizes the key difficulties which emerge during the simulation of phase behaviors described using the model of “black oil” or fully functional compositional model with the help of the equation-of-state (EOS) in order to create valid continuously operating geological-technological 3D models of gas-condensate reservoirs. The input data for 3D filtration reservoir modeling, the development of which started in the 1960s, are the results of initial gas-condensate and thermodynamic studies. Hydrocarbon component composition of reservoir gas in the existing gas-condensate studies is given only to fraction C5+. Taking into account the peculiarities of initial thermodynamic research with the use of the differential condensation experiment and the absence of such type of experiment in the list of standard experiments in commercially-available PVT-simulators, there appeared a need to develop rational approaches and techniques for correct integration of existing geological-production data in PVT modeling. This article describes the methods for adjusting Peng-Robinson equation-of-state under the condition of input data shortage. Depending on initial data availability and quality, the authors have suggested two different methods. The first PVT-modeling method, which makes it possible to adjust the equation-of-state, is based on the data of component composition of gases and fractional composition of the stable condensate. In case the data of fractional composition of the stable condensate are not available, the authors suggest the second method that is the splitting of fraction C5+ following Whitson volumetric methodology. The suggested methods and two different approaches to EOS adjustment allow effective PVT-modeling using available geological and production data. Study results are presented as the graphical dependencies of comparison of potential hydrocarbons C5+content change in reservoir gas before and after configuring the equation-of-state, as well as the synthetic “liquid saturation” loss curve of the CVD experiment.
{"title":"The Adjustment of EOS of Gas-condensate Mixture under the Condition of Input Data Shortage","authors":"О. V. Burachok, D. Pershyn, S. Matkivskyi, Ye. S. Bikman Ye. S. Bikman, О. Kondrat","doi":"10.31471/1993-9973-2020-1(74)-82-88","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-1(74)-82-88","url":null,"abstract":"The article characterizes the key difficulties which emerge during the simulation of phase behaviors described using the model of “black oil” or fully functional compositional model with the help of the equation-of-state (EOS) in order to create valid continuously operating geological-technological 3D models of gas-condensate reservoirs. The input data for 3D filtration reservoir modeling, the development of which started in the 1960s, are the results of initial gas-condensate and thermodynamic studies. Hydrocarbon component composition of reservoir gas in the existing gas-condensate studies is given only to fraction C5+. Taking into account the peculiarities of initial thermodynamic research with the use of the differential condensation experiment and the absence of such type of experiment in the list of standard experiments in commercially-available PVT-simulators, there appeared a need to develop rational approaches and techniques for correct integration of existing geological-production data in PVT modeling. This article describes the methods for adjusting Peng-Robinson equation-of-state under the condition of input data shortage. Depending on initial data availability and quality, the authors have suggested two different methods. The first PVT-modeling method, which makes it possible to adjust the equation-of-state, is based on the data of component composition of gases and fractional composition of the stable condensate. In case the data of fractional composition of the stable condensate are not available, the authors suggest the second method that is the splitting of fraction C5+ following Whitson volumetric methodology. The suggested methods and two different approaches to EOS adjustment allow effective PVT-modeling using available geological and production data. Study results are presented as the graphical dependencies of comparison of potential hydrocarbons C5+content change in reservoir gas before and after configuring the equation-of-state, as well as the synthetic “liquid saturation” loss curve of the CVD experiment.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122330716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-31DOI: 10.31471/1993-9973-2020-1(74)-53-71
Y. Yakymechko, Y. Femiak
The article presents the theoretical research of the use of swirling flows with reverse jets and with developed precessing vortex core in cavitators and other devices. While describing the motion of the vortex core in the free swirling jet of the fluid it is necessary to take into account that according to the experimental data the vortex core can swirl along the length of the jet and moves around the jet axis in the zone between the area of reverse flows and the boundary outer layer. In this case, it is the vortex core which is under the influence of the basic swirling flow. Herewith, it is necessary to take into account that due to commensurate sizes of the vortex core and the jet, the impact on the core will be different owing to non-uniform distribution of speeds in the jet itself. On the basis of the known formulas, the authors have deduced the improved theoretical dependence of the degree of flow swirl on the flow rate, the vortex core vibration frequency and structural parameters under the conditions of the consistency of swirling flow itself. The theoretical dependence shows that the degree of flow swirl is directly proportional to the precessing vortex core vibration frequency and inversely proportional to the square of mass flow rate. Thus, ensuring the consistency of the swirling flow with varying flow-rate requires the corresponding change of the swirl degree or the influence on the frequency of vibrations of the precessing vortex core. On the basis of the deduced theoretical dependences, the authors have developed and implemented in the computer programs the following calculations: the dependence of the coefficient of the flow swirl on the vortex core vibration frequency; the simulation of the precession of the vortex core in the swirling flow; the research of speed fluctuation in the swirling flow; speed fluctuation during the interaction of swirling jets.
{"title":"The Research of the Swirling Flow of the Power Fluid during its Passing through the Hydrodynamic Cavitator","authors":"Y. Yakymechko, Y. Femiak","doi":"10.31471/1993-9973-2020-1(74)-53-71","DOIUrl":"https://doi.org/10.31471/1993-9973-2020-1(74)-53-71","url":null,"abstract":"The article presents the theoretical research of the use of swirling flows with reverse jets and with developed precessing vortex core in cavitators and other devices. While describing the motion of the vortex core in the free swirling jet of the fluid it is necessary to take into account that according to the experimental data the vortex core can swirl along the length of the jet and moves around the jet axis in the zone between the area of reverse flows and the boundary outer layer. In this case, it is the vortex core which is under the influence of the basic swirling flow. Herewith, it is necessary to take into account that due to commensurate sizes of the vortex core and the jet, the impact on the core will be different owing to non-uniform distribution of speeds in the jet itself. On the basis of the known formulas, the authors have deduced the improved theoretical dependence of the degree of flow swirl on the flow rate, the vortex core vibration frequency and structural parameters under the conditions of the consistency of swirling flow itself. The theoretical dependence shows that the degree of flow swirl is directly proportional to the precessing vortex core vibration frequency and inversely proportional to the square of mass flow rate. Thus, ensuring the consistency of the swirling flow with varying flow-rate requires the corresponding change of the swirl degree or the influence on the frequency of vibrations of the precessing vortex core. On the basis of the deduced theoretical dependences, the authors have developed and implemented in the computer programs the following calculations: the dependence of the coefficient of the flow swirl on the vortex core vibration frequency; the simulation of the precession of the vortex core in the swirling flow; the research of speed fluctuation in the swirling flow; speed fluctuation during the interaction of swirling jets. \u0000 ","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123524880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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