Pub Date : 2021-12-28DOI: 10.31471/1993-9973-2021-4(81)-49-60
S. Matkivskyi
The determination reliability of development technological indicators plays an important role in the further field development, since they affect the field development rate, the drill footage, the amount of capital investments, the construction of ground communications, etc. Therefore, the choice of the methodology for forecasting technological indicators plays a decisive role in making investment decisions. To forecast the technological indicators of the gas/gas-condensate fields development a significant number of methods have been developed, among which the main ones are the methods of integrating the differential equations of fluids unsteady filtration within a porous medium inhomogeneous in reservoir properties, consistent change in stationary states and the basic laws extrapolation of the actual data dynamics. The above methods are characterized by varying degrees of the calculated values reliability and certain technological limitations. To assess the magnitude of the possiblemargin of error in the design of the hydrocarbon fields development, a study of generally accepted methods that are widely used in the oil and gas industry has been carried out. Based on the study results, it has been found that the Petroleum Experts IPM suite software package provides the highest accuracy and reliability of the predicted development indicators, since it takes into account the reservoir properties, phase transformations of complex reservoir hydrocarbon systems and the regularities of fluid movement along the wellbore. The results of the conducted research allow us to assert that the use of the main tools of hydrodynamic modeling in accordance with the world practice of designing the deve-lopment of hydrocarbon fields will increase the production efficiency of residual hydrocarbon reserves at the final stage of development, which form the main potential for increasing its own production in Ukraine.
{"title":"Research of the widespread methodologies for forecasting gas deposit development under the gas drive","authors":"S. Matkivskyi","doi":"10.31471/1993-9973-2021-4(81)-49-60","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-4(81)-49-60","url":null,"abstract":"The determination reliability of development technological indicators plays an important role in the further field development, since they affect the field development rate, the drill footage, the amount of capital investments, the construction of ground communications, etc. Therefore, the choice of the methodology for forecasting technological indicators plays a decisive role in making investment decisions. To forecast the technological indicators of the gas/gas-condensate fields development a significant number of methods have been developed, among which the main ones are the methods of integrating the differential equations of fluids unsteady filtration within a porous medium inhomogeneous in reservoir properties, consistent change in stationary states and the basic laws extrapolation of the actual data dynamics. The above methods are characterized by varying degrees of the calculated values reliability and certain technological limitations. To assess the magnitude of the possiblemargin of error in the design of the hydrocarbon fields development, a study of generally accepted methods that are widely used in the oil and gas industry has been carried out. Based on the study results, it has been found that the Petroleum Experts IPM suite software package provides the highest accuracy and reliability of the predicted development indicators, since it takes into account the reservoir properties, phase transformations of complex reservoir hydrocarbon systems and the regularities of fluid movement along the wellbore. The results of the conducted research allow us to assert that the use of the main tools of hydrodynamic modeling in accordance with the world practice of designing the deve-lopment of hydrocarbon fields will increase the production efficiency of residual hydrocarbon reserves at the final stage of development, which form the main potential for increasing its own production in Ukraine.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":" 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120831153","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 : 2021-12-28DOI: 10.31471/1993-9973-2021-4(81)-16-23
М. Borovyk, А. Vovk, М. V. Gordijchuk
Today the pressures in productive gas collectors on the Dnieper-Donets rift are considerably lower than hydrostatic ones. Opening such formations while drilling is a challenging task in terms of preventing losses and differential pressures. In order to solve the problem, one needs to improve the methods of effective temporary colmation of productive formations with acid-soluble materials under the conditions of abnormally low formation pressures during drilling on fields with late terms of development. Traditional algorithms of lost circulation control in abnormally low reservoir pressure, developed by leading world services companies, often turn out to be unworkable. In order to conduct the lost circulation control, one often chooses colmatants, which totally align with the principles of ideal packaging, however do not meet the criterion of strength or resistance to significant differential pressure. As a result, in the course of the subsequent drilling there can be another circulation loss in already colmated layer. In Ukraine the lost circulation control sphere is being developed by means of selecting colmatants according to a new principle. The article has proposed the activities for the lost circulation curing and pollution reducing of productive collectors. For this purpose the generalized characteristic-criterion of colmatants has been developed and used. The criterion got a name “flexibility”, i.e. a deformation, compaction and penetration (into porous-fissured medium) capability under immense pressure. With the help of the criterion the set of particular colmatant have been chosen; also, principles of colmatant mixtures selection under the relevant geological and mining conditions have been identified. In many cases, there is no need to calculate the physical parameters of the formation and the circulation loss crack due to flexibility of colmatant; one only has to select the optimal concentrations of materials and the periodicity of input these materials to the mud. The developed technology confirms the need to improve the algorithms for circulation loss prevention and curing, primarily for conditions of abnormally low reservoir pressures.
{"title":"Colmatating of productive gas formations while drilling wells with abnormally lower hydrostatic pressures","authors":"М. Borovyk, А. Vovk, М. V. Gordijchuk","doi":"10.31471/1993-9973-2021-4(81)-16-23","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-4(81)-16-23","url":null,"abstract":"Today the pressures in productive gas collectors on the Dnieper-Donets rift are considerably lower than hydrostatic ones. Opening such formations while drilling is a challenging task in terms of preventing losses and differential pressures. In order to solve the problem, one needs to improve the methods of effective temporary colmation of productive formations with acid-soluble materials under the conditions of abnormally low formation pressures during drilling on fields with late terms of development. Traditional algorithms of lost circulation control in abnormally low reservoir pressure, developed by leading world services companies, often turn out to be unworkable. In order to conduct the lost circulation control, one often chooses colmatants, which totally align with the principles of ideal packaging, however do not meet the criterion of strength or resistance to significant differential pressure. As a result, in the course of the subsequent drilling there can be another circulation loss in already colmated layer. In Ukraine the lost circulation control sphere is being developed by means of selecting colmatants according to a new principle. The article has proposed the activities for the lost circulation curing and pollution reducing of productive collectors. For this purpose the generalized characteristic-criterion of colmatants has been developed and used. The criterion got a name “flexibility”, i.e. a deformation, compaction and penetration (into porous-fissured medium) capability under immense pressure. With the help of the criterion the set of particular colmatant have been chosen; also, principles of colmatant mixtures selection under the relevant geological and mining conditions have been identified. In many cases, there is no need to calculate the physical parameters of the formation and the circulation loss crack due to flexibility of colmatant; one only has to select the optimal concentrations of materials and the periodicity of input these materials to the mud. The developed technology confirms the need to improve the algorithms for circulation loss prevention and curing, primarily for conditions of abnormally low reservoir pressures.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"55 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125710290","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 : 2021-12-28DOI: 10.31471/1993-9973-2021-4(81)-61-70
V. М. Charkovskyy, V. D. Serediuk
The methods of factorial experiment and regression analysis have been applied ad hoc to search the optimum combinations of technological parameters for the salvage operation with the help of a drilling jar. The factors chosen are the percussive mechanism striker travel, the length of drill collars in the drill assembly and the discharge force. The response functions on the matrix of the central rotatable composite design for three main factors have been obtained. The functions are the relationships between the maximum and minimum internal forces at the upper boundary of the grip and the factors. Based on the dependencies, the response surface of the parameter values has been obtained. The influence of each factor on the corresponding parameters of the salvage operation has been graphically analyzed. It has been noted that the change in the discharge force has a weakly nonlinear effect on the impact parameters, and the influence of the other two factors has a pronounced extremum. The conditions which lead to the salvage operation shock mode traversing to pulse-wave one have been formulated. Recommendations on a choice of the salvage operation technological parameters forNaftogaz of Ukraine subsidiaries depending on various categories and types of the sticking have been formulated.Cases of the effective use of a drilling jar have been reported. Requirements for the drilling jar design have been formulated. It is proposed to replace the imported Hydra-jar with the construction in the form of two separate structures with mechanical locking pairs to create selective "up-down" strikes. The BHA design with two drill jars to realize the effect of shock wave acceleration has been proposed.
{"title":"BHA with two drill jars to prevent sticking while drilling","authors":"V. М. Charkovskyy, V. D. Serediuk","doi":"10.31471/1993-9973-2021-4(81)-61-70","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-4(81)-61-70","url":null,"abstract":"The methods of factorial experiment and regression analysis have been applied ad hoc to search the optimum combinations of technological parameters for the salvage operation with the help of a drilling jar. The factors chosen are the percussive mechanism striker travel, the length of drill collars in the drill assembly and the discharge force. The response functions on the matrix of the central rotatable composite design for three main factors have been obtained. The functions are the relationships between the maximum and minimum internal forces at the upper boundary of the grip and the factors. Based on the dependencies, the response surface of the parameter values has been obtained. The influence of each factor on the corresponding parameters of the salvage operation has been graphically analyzed. It has been noted that the change in the discharge force has a weakly nonlinear effect on the impact parameters, and the influence of the other two factors has a pronounced extremum. The conditions which lead to the salvage operation shock mode traversing to pulse-wave one have been formulated. Recommendations on a choice of the salvage operation technological parameters forNaftogaz of Ukraine subsidiaries depending on various categories and types of the sticking have been formulated.Cases of the effective use of a drilling jar have been reported. Requirements for the drilling jar design have been formulated. It is proposed to replace the imported Hydra-jar with the construction in the form of two separate structures with mechanical locking pairs to create selective \"up-down\" strikes. The BHA design with two drill jars to realize the effect of shock wave acceleration has been proposed.\u0000 ","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133768845","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 : 2021-12-28DOI: 10.31471/1993-9973-2021-4(81)-71-81
І. B. Kopey
The most widespread mechanized way of oil production is use of sucker rod deep pumping units. This mode of well operation is characterized by moderate costs of the equipment and its service, increase in production when developing difficult-to-recover oil reserves, increase in production of layer which is reached by decrease in critical bottom hole pressure. Installation of the sucker rod deep pump comprises the land and borehole equipment. The drive, the well head setup and control system belongs to the land equipment. For today the pump unit is used as a wire. The unit itself represents the four-link crank-and-rod mechanism converting crank rotational motion into reciprocal motion of polished rod carrier bar. The work considers the prospects of creation and implementation of the drives nonconventional designs replacing classical pumping units, namely hydraulic actuators of sucker rod deep pumps on Ukrainian oil fields. Furthermore, the possible fields of their use has been defined. The hydraulic pressure drives existing designs presented by the leading global manufactures have been analyzed via critical-comparative method. Moreover, their design features in comparison with pumping units and chain occasions have been covered, the main advantages and shortcomings have been revealed. The usage possibilities of remote and automatic control of the hydraulic pressure drive working mode have been specified. The drive allows to carry out monitoring and remote control of technological process in real time with the minimum participation of service staff. The work presents the results of the hydraulic pressure drive PSHN-80-2.5 with pneumatic equilibration pilot test on well 64-Dolyna of scientific testing ground of the Ivano-Frankivsk National Technical University of Oil and Gas which have confirmed the work capacity of all drive systems and also convenience of carrying out the installation operations.
{"title":"Prospects of using the hydraulic drive of the rod well pump","authors":"І. B. Kopey","doi":"10.31471/1993-9973-2021-4(81)-71-81","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-4(81)-71-81","url":null,"abstract":"The most widespread mechanized way of oil production is use of sucker rod deep pumping units. This mode of well operation is characterized by moderate costs of the equipment and its service, increase in production when developing difficult-to-recover oil reserves, increase in production of layer which is reached by decrease in critical bottom hole pressure. Installation of the sucker rod deep pump comprises the land and borehole equipment. The drive, the well head setup and control system belongs to the land equipment. For today the pump unit is used as a wire. The unit itself represents the four-link crank-and-rod mechanism converting crank rotational motion into reciprocal motion of polished rod carrier bar. The work considers the prospects of creation and implementation of the drives nonconventional designs replacing classical pumping units, namely hydraulic actuators of sucker rod deep pumps on Ukrainian oil fields. Furthermore, the possible fields of their use has been defined. The hydraulic pressure drives existing designs presented by the leading global manufactures have been analyzed via critical-comparative method. Moreover, their design features in comparison with pumping units and chain occasions have been covered, the main advantages and shortcomings have been revealed. The usage possibilities of remote and automatic control of the hydraulic pressure drive working mode have been specified. The drive allows to carry out monitoring and remote control of technological process in real time with the minimum participation of service staff. The work presents the results of the hydraulic pressure drive PSHN-80-2.5 with pneumatic equilibration pilot test on well 64-Dolyna of scientific testing ground of the Ivano-Frankivsk National Technical University of Oil and Gas which have confirmed the work capacity of all drive systems and also convenience of carrying out the installation operations.\u0000 ","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124651463","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 : 2021-10-22DOI: 10.31471/1993-9973-2021-3(80)-68-76
S. Matkivskyi, Y. Bikman, O. Kondrat, L. I. Haidarova
The resource base of hydrocarbon fields in Ukraine is characterized by deterioration in the quality and structure of reserves over time and is accompanied by an increase in the share of hard-to-recover reserves, the development of which is currently being carried out at a very low rate. In the near future, hydrocarbon production in Ukraine will be associated not so much with the introduction of new fields into development, but with an increase in the final recovery factors of old and depleted fields. To establish the effectiveness of the introduction of secondary and tertiary technologies for the development of Ukrainian fields, a study of the technology of injection of carbon dioxide has been carried out on the example of the Hadyach oil and gas condensate field. The results of the studies carried out using the main tools of hydrodynamic modeling has indicated that in the case of the introduction of the carbon dioxide injecting technology into the reservoir of the V-16 horizon, the rates of production of liquid hydrocarbons will stabilize. Due to the high solubility of carbon dioxide in liquid hydrocarbons, an increase in the volume of condensate is achieved, which provides conditions for its filtration. Based on the research results, the forecast condensate recovery factor has been calculated. At the time of the breakthrough of carbon dioxide into production wells, the final condensate recovery factor is 7.92% relative to residual reserves, and in case of depletion development - 6.68%. According to the simulation results, it has been found that in the case of introducing the technology of injecting carbon dioxide into the reservoir of the B-16 horizon, the final condensate recovery factor increases by 1.24%. The practical implementation of secondary and tertiary technologies for the development of depleted oil and gas fields in Ukraine in the broad sense of the problem will significantly intensify the process of hydrocarbon production and reach the global level of solving the problem.
{"title":"Prospects for additional development of the Hadyach oil and gas condensate field with significant reserves of retrograde condensate","authors":"S. Matkivskyi, Y. Bikman, O. Kondrat, L. I. Haidarova","doi":"10.31471/1993-9973-2021-3(80)-68-76","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-3(80)-68-76","url":null,"abstract":"The resource base of hydrocarbon fields in Ukraine is characterized by deterioration in the quality and structure of reserves over time and is accompanied by an increase in the share of hard-to-recover reserves, the development of which is currently being carried out at a very low rate. In the near future, hydrocarbon production in Ukraine will be associated not so much with the introduction of new fields into development, but with an increase in the final recovery factors of old and depleted fields. To establish the effectiveness of the introduction of secondary and tertiary technologies for the development of Ukrainian fields, a study of the technology of injection of carbon dioxide has been carried out on the example of the Hadyach oil and gas condensate field. The results of the studies carried out using the main tools of hydrodynamic modeling has indicated that in the case of the introduction of the carbon dioxide injecting technology into the reservoir of the V-16 horizon, the rates of production of liquid hydrocarbons will stabilize. Due to the high solubility of carbon dioxide in liquid hydrocarbons, an increase in the volume of condensate is achieved, which provides conditions for its filtration. Based on the research results, the forecast condensate recovery factor has been calculated. At the time of the breakthrough of carbon dioxide into production wells, the final condensate recovery factor is 7.92% relative to residual reserves, and in case of depletion development - 6.68%. According to the simulation results, it has been found that in the case of introducing the technology of injecting carbon dioxide into the reservoir of the B-16 horizon, the final condensate recovery factor increases by 1.24%. The practical implementation of secondary and tertiary technologies for the development of depleted oil and gas fields in Ukraine in the broad sense of the problem will significantly intensify the process of hydrocarbon production and reach the global level of solving the problem.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"415 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116276383","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 : 2021-09-30DOI: 10.31471/1993-9973-2021-3(80)-7-18
V. Hnidets, K. Hryhorchuk, M. Pavlyuk, L. Koshil, M. Yakovenko
The lithological features of the Middle Devonian sediments of the Skhidnosaratska structure of the Dobrudja Foredeep in the aspect of their influence on the formation of reservoir rocks and hydrocarbon reservoirs have been considered. Nine lithocycles of regressive nature (e-1 – e-5; g-1 – g-4), characterized by a two-membered structure have been identified in the section. Each lithocycle represents a separate productive horizon. The lower parts of the latter are composed of porous and fractured reservoir rocks (limestones, dolomites, siltstones, sandstones), and the upper parts are composed of fluid-resistant packs (marls, anhydrites).Features of cyclic sedimentation conditions caused spatial-age variability of trap localization and morphology, nature of distribution of reservoir rocks of various types, and post-sedimentation processes caused spatial heterogeneity of petrophysical properties of rocks, which entailed different prospects for individual areas of the Skhidnosaratske deposit. The vaulted traps of the productive horizons of the Eifelian deposits tend to the area of borehole 2, and the Zhivetian deposits to the borehole 1. Consequently, in the first case, the most perspective horizons are e-2 and e-3, in the second – g-2 – g-4. Often more powerful packs of better-quality reservoir rocks are developed outside the vault, which leads to the formation of lithological traps in the e-1 and e-2 horizons. It has been shown that the complex structure (presence of layers of carbonate and terrigenous rocks) of fluid-resistant marl-sulfate packs could cause dispersion of hydrocarbons and thus reduce the prospects of individual horizons, in particular, e-2 and e-3. The established heterogeneity of the structure of the productive horizons, the pinching out of individual packs of both pore and fractured reservoirs, the spatial uneven development of the limestones anhydritization and dolomitization processes give possibilities to suggest the formation of separate deposits with different hypsometry of water-oil contacts.
{"title":"Lithogenetic preconditions of reservoirs and reservoir rocks formation in the Middle Devonian sediments of the Skhidnosaratske deposit (Dobrudja Foredeep)","authors":"V. Hnidets, K. Hryhorchuk, M. Pavlyuk, L. Koshil, M. Yakovenko","doi":"10.31471/1993-9973-2021-3(80)-7-18","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-3(80)-7-18","url":null,"abstract":"The lithological features of the Middle Devonian sediments of the Skhidnosaratska structure of the Dobrudja Foredeep in the aspect of their influence on the formation of reservoir rocks and hydrocarbon reservoirs have been considered. Nine lithocycles of regressive nature (e-1 – e-5; g-1 – g-4), characterized by a two-membered structure have been identified in the section. Each lithocycle represents a separate productive horizon. The lower parts of the latter are composed of porous and fractured reservoir rocks (limestones, dolomites, siltstones, sandstones), and the upper parts are composed of fluid-resistant packs (marls, anhydrites).Features of cyclic sedimentation conditions caused spatial-age variability of trap localization and morphology, nature of distribution of reservoir rocks of various types, and post-sedimentation processes caused spatial heterogeneity of petrophysical properties of rocks, which entailed different prospects for individual areas of the Skhidnosaratske deposit. The vaulted traps of the productive horizons of the Eifelian deposits tend to the area of borehole 2, and the Zhivetian deposits to the borehole 1. Consequently, in the first case, the most perspective horizons are e-2 and e-3, in the second – g-2 – g-4. Often more powerful packs of better-quality reservoir rocks are developed outside the vault, which leads to the formation of lithological traps in the e-1 and e-2 horizons. It has been shown that the complex structure (presence of layers of carbonate and terrigenous rocks) of fluid-resistant marl-sulfate packs could cause dispersion of hydrocarbons and thus reduce the prospects of individual horizons, in particular, e-2 and e-3. The established heterogeneity of the structure of the productive horizons, the pinching out of individual packs of both pore and fractured reservoirs, the spatial uneven development of the limestones anhydritization and dolomitization processes give possibilities to suggest the formation of separate deposits with different hypsometry of water-oil contacts.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"97 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132812034","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 : 2021-09-30DOI: 10.31471/1993-9973-2021-3(80)-46-52
D. Panevnyk
The scheme of theoretical analysis of the influence of rotational motion on the working process of the near-bit jet pump is chosen, the methods of its realization and limits of use are determined. On the basis of the potential flows theory with the application of elementary hydrodynamic functions of a complex variable, basics for the development of analytical models of the near-bit ejector pump operation for conditions of its rotation in a well have been worked out. Components of a mixed flow are modeled as functions of the vortex flow and parallel jet flow. Application of certain hydrodynamic functions of a complex variable has allowed to combine partial outcomes of differential equations of elementary streams motions and to determine the structure of the mixed flow function. The equation of the mixed flow motion is given in the form of a complex potential, components of which are equal to Laplace’s equation and Cauchy-Riemann Conditions, and determine the kinematics of irrotational flow. Possibility of application of the complex variable functions’ theory for velocities profiles modeling and determination of limits for dissociation of mixed flows by rotation of the near-bit jet pump in a well has been shown. The list of hydro-dynamic parameters, which should be taken into consideration by modeling of the ejector system working process, has been determined, and the structure of initial equations, that characterize kinematic picture of velocities field in the chamber of the ejector pump mixing has been established. Limit conditions for determination of a complex potential of mixed flows and application limits of the proposed method of circulation flows modeling have been stated. The class of hydrodynamic problems has been established, to which one may relate the problem of finding the complex potential of mixed flows in a chamber for mixing of an ejector pump by its rotation in a well.
{"title":"Substantiation of the method of modeling circulating flows during the rotation of the overhead jet pump","authors":"D. Panevnyk","doi":"10.31471/1993-9973-2021-3(80)-46-52","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-3(80)-46-52","url":null,"abstract":"The scheme of theoretical analysis of the influence of rotational motion on the working process of the near-bit jet pump is chosen, the methods of its realization and limits of use are determined. On the basis of the potential flows theory with the application of elementary hydrodynamic functions of a complex variable, basics for the development of analytical models of the near-bit ejector pump operation for conditions of its rotation in a well have been worked out. Components of a mixed flow are modeled as functions of the vortex flow and parallel jet flow. Application of certain hydrodynamic functions of a complex variable has allowed to combine partial outcomes of differential equations of elementary streams motions and to determine the structure of the mixed flow function. The equation of the mixed flow motion is given in the form of a complex potential, components of which are equal to Laplace’s equation and Cauchy-Riemann Conditions, and determine the kinematics of irrotational flow. Possibility of application of the complex variable functions’ theory for velocities profiles modeling and determination of limits for dissociation of mixed flows by rotation of the near-bit jet pump in a well has been shown. The list of hydro-dynamic parameters, which should be taken into consideration by modeling of the ejector system working process, has been determined, and the structure of initial equations, that characterize kinematic picture of velocities field in the chamber of the ejector pump mixing has been established. Limit conditions for determination of a complex potential of mixed flows and application limits of the proposed method of circulation flows modeling have been stated. The class of hydrodynamic problems has been established, to which one may relate the problem of finding the complex potential of mixed flows in a chamber for mixing of an ejector pump by its rotation in a well.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126790171","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 : 2021-09-30DOI: 10.31471/1993-9973-2021-3(80)-60-67
A. Aliev
Geopolymer systems are quite successfully used in such operations as industrial and civil construction, production of fire - resistant concrete, isolation and disposal of radioactive waste, etc. The oil and gas industry was no exception. They are one of the most promising alternatives to Portland cement in insulation operations. They allow achieving sufficiently high performances of well construction strength, corrosion resistance, and in some compositions these parameters significantly exceed those of Portland cement. In recent years, a significant amount of research has been carried out aimed at the development of geo polymer compositions for cementing oil and gas wells, which showed that these systems have strength characteristics comparable to Portland cement, low permeability, resistance to drilling mud and reservoir conditions, and the ability to self-repair. However, despite all the advantages of Geo polymer systems, their most significant disadvantage is poor regulation of rheological properties. Geo polymers (GP) with low ash content do not provide the proper rheological characteristics for the use in insulation operations. Low values of pumpability of solutions are still a serious restriction for wide practical implementation. The use of geopolymer solutions with the correct selection of the compositional composition capable of demonstrating significant improvements in strength and rheological parameters as a result of mixing with anhydrous drilling fluids is a very promising solution to this problem. The paper presents the results of research on the additives of non-aqueous fluids such as oil- based and synthetic-based drilling fluids and inverted emulsion drilling fluids on rheology of geo polymers. The obtained results allow stating that the rheological parameters of geo polymer compositions improve up to comparable values with Portland cement, which considerably extends the range of application of these solutions to use in operations of primary, squeeze cementing and well workover.
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Pub Date : 2021-09-30DOI: 10.31471/1993-9973-2021-3(80)-26-35
Y. Yakymechko, L. B. Moroz, S. Oveckiy, Y. Femiak
The article considers the use of a jet pump design with separate workflows for the production of high-viscosity oil. The authors have developed an improved design of a jet well unit with separate workflows, in which the working fluid, moving through the inner annulus, reaching the pump housing, is divided into two streams. A portion of the working mixture - 40% (depending on the cross section of the nozzle of the twisting chamber) enters the twisting chamber of the hydrodynamic cavitator, via which the working fluid passes, creating gas bubbles. These bubbles flake under the action of external pressure at the outlet of the chamber when the liquid passes through a stepped diffuser. The second portion of the working mixture - 60% (depending on the cross section of the jet nozzle) enters the pump nozzle, where flowing at high speed, forms a zone of reduced pressure, resulting in the mixture and oil from the subpacker enter the mixing chamber of the device. We have considered the conditions that can provide the effect of gushing, taking into account the fact that with the use of jet devices can achieve this effect. There may be two cases: 1) the extraction of fluid from wells is limited; 2) the extraction of fluid from wells is unlimited. The initial data, technological parameters and the sequence of their determination are given for the variant when light oil is used as a working liquid, and the working pressure of the surface power plant is not set. Determining the technological parameters of the well unit is a solution to the direct problem, and then - the reverse one. The improved method for calculating the technological parameters of a jet well unit with separate workflows, the design of which has no analogues in Ukraine, is proposed. This technique has been tested during industrial tests of a prototype of an equipment set for the extraction of high-viscosity oils. The method of operation of the pumping-ejector downhole jet unit with a hydrodynamic pulsator for the extraction of high-viscosity oils is protected by a patent of Ukraine.
{"title":"Methods for determining the technological parameters of an advanced jet well installation","authors":"Y. Yakymechko, L. B. Moroz, S. Oveckiy, Y. Femiak","doi":"10.31471/1993-9973-2021-3(80)-26-35","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-3(80)-26-35","url":null,"abstract":"The article considers the use of a jet pump design with separate workflows for the production of high-viscosity oil. The authors have developed an improved design of a jet well unit with separate workflows, in which the working fluid, moving through the inner annulus, reaching the pump housing, is divided into two streams. A portion of the working mixture - 40% (depending on the cross section of the nozzle of the twisting chamber) enters the twisting chamber of the hydrodynamic cavitator, via which the working fluid passes, creating gas bubbles. These bubbles flake under the action of external pressure at the outlet of the chamber when the liquid passes through a stepped diffuser. The second portion of the working mixture - 60% (depending on the cross section of the jet nozzle) enters the pump nozzle, where flowing at high speed, forms a zone of reduced pressure, resulting in the mixture and oil from the subpacker enter the mixing chamber of the device. We have considered the conditions that can provide the effect of gushing, taking into account the fact that with the use of jet devices can achieve this effect. There may be two cases: 1) the extraction of fluid from wells is limited; 2) the extraction of fluid from wells is unlimited. The initial data, technological parameters and the sequence of their determination are given for the variant when light oil is used as a working liquid, and the working pressure of the surface power plant is not set. Determining the technological parameters of the well unit is a solution to the direct problem, and then - the reverse one. The improved method for calculating the technological parameters of a jet well unit with separate workflows, the design of which has no analogues in Ukraine, is proposed. This technique has been tested during industrial tests of a prototype of an equipment set for the extraction of high-viscosity oils. The method of operation of the pumping-ejector downhole jet unit with a hydrodynamic pulsator for the extraction of high-viscosity oils is protected by a patent of Ukraine.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126194408","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 : 2021-09-30DOI: 10.31471/1993-9973-2021-3(80)-53-59
I. Kovbasiuk, I. Chudyk, O. Martsynkiv, M. B. Seniushkovych
The analysis of field data from casing failure on the fields of the Borislav and Dolinsky oilfield regions has been carried out. It has been found that the most significant negative factors that have a bearing on the preservation of the integrity of the casing strings are the presence of saliniferous rock intervals in the borehole log and not taking into account the possible impact of rock pressure when designing casing strings in these rocks. In saliniferous rocks, under certain conditions, rock pressure can be transferred to the column. To study the thermobaric conditions of the external pressure transfer to the casing from the saliniferous rock, experimental tests have been carried out on the core materials of the rocks of the Vorotyshchensk floor, sampled at different depths of the Oriv-Ulychniansk field. For this purpose, a special laboratory installation was made, which allows to study the stress conditions and rock flowage on exposure to formation temperature and rock pressure. Because it was difficult to directly measure the radial pressure transmitted to the pipe and the temperature inside the chamber during the experiments, the installation was calibrated by pressure and temperature. This made it possible to determine the temperature inside the chamber by the value of the voltage supplied to the heating element, and the value of the radial pressure supplied to the pipe - by the value of the pressure inside the pipe. Based on the results of experimental research, the depen-dences of the lateral earth pressure coefficient of saliniferous rocks on temperature were obtained at various values of normal stresses. It was found that when the temperature rises to 70 ° C and higher, the value of the lateral external pressure on the pipe approaches the vertical component of the pressure. According to the results of the experimental research, the temperature and pressure conditions for accounting for rock pressure were recommended when calculating casing strings for external overpressure in the intervals of occurrence of saliniferous rocks of the Carpathian fields.
{"title":"Experimental research of the conditions for the transfer of rock pressure by saliniferous rocks to the casing","authors":"I. Kovbasiuk, I. Chudyk, O. Martsynkiv, M. B. Seniushkovych","doi":"10.31471/1993-9973-2021-3(80)-53-59","DOIUrl":"https://doi.org/10.31471/1993-9973-2021-3(80)-53-59","url":null,"abstract":"The analysis of field data from casing failure on the fields of the Borislav and Dolinsky oilfield regions has been carried out. It has been found that the most significant negative factors that have a bearing on the preservation of the integrity of the casing strings are the presence of saliniferous rock intervals in the borehole log and not taking into account the possible impact of rock pressure when designing casing strings in these rocks. In saliniferous rocks, under certain conditions, rock pressure can be transferred to the column. To study the thermobaric conditions of the external pressure transfer to the casing from the saliniferous rock, experimental tests have been carried out on the core materials of the rocks of the Vorotyshchensk floor, sampled at different depths of the Oriv-Ulychniansk field. For this purpose, a special laboratory installation was made, which allows to study the stress conditions and rock flowage on exposure to formation temperature and rock pressure. Because it was difficult to directly measure the radial pressure transmitted to the pipe and the temperature inside the chamber during the experiments, the installation was calibrated by pressure and temperature. This made it possible to determine the temperature inside the chamber by the value of the voltage supplied to the heating element, and the value of the radial pressure supplied to the pipe - by the value of the pressure inside the pipe. Based on the results of experimental research, the depen-dences of the lateral earth pressure coefficient of saliniferous rocks on temperature were obtained at various values of normal stresses. It was found that when the temperature rises to 70 ° C and higher, the value of the lateral external pressure on the pipe approaches the vertical component of the pressure. According to the results of the experimental research, the temperature and pressure conditions for accounting for rock pressure were recommended when calculating casing strings for external overpressure in the intervals of occurrence of saliniferous rocks of the Carpathian fields.","PeriodicalId":159170,"journal":{"name":"Prospecting and Development of Oil and Gas Fields","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123371904","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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