Prospecting and Development of Oil and Gas Fields 2019-06-10T16:31:56+03:00 O. R. Kondrat Open Journal Systems <p>The "Prospecting and Development of Oil and Gas Fields" includes the following sections of Oil and Gas Engineering:</p> <p>&nbsp;·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; topical problems of oil and gas sphere</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; engineering and technology</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; research and methods of&nbsp;analysis</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; science to production</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fields experience</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; certification, standardization, and quality</p> <p>·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; history of oil and gas science and technology</p> <p>&nbsp;The "Prospecting and Development of Oil and Gas Fields" Journal publishes review and research works that are dedicated to these subjects (but not limited only by them).</p> MODEL OF THE FOLDING PROCESS AND FORMATION OF BREACHES IN THE BORISLAV-POKUTSKA ZONE OF THE PRECARPATHIAN DEFLECTION 2019-05-14T15:36:19+03:00 Galina Zhychenko Iryna Mykhailiv Nataliya Goptaryova Galyna Gorvanko <p>The relevance of research is due to a detailed study of the features of the geological structure of the Borislav-Pokutska zone of the Precarpathian deflection and, in particular, of local structural forms, as possible traps for oil and gas, for reliable forecasting of the oil and gas potential of the subsoil. The Borislav-Pokutska zone of the Precarpathian deflection refers to one of the oldest oil and gas producing regions in Ukraine, the hydrocarbon potential of which is not exhausted. The complex block structure of the structures in the Borislav-Pokutska zone requires the development of specific methods for conducting prospecting for oil and gas. In this regard, it is important to determine the nature of the distribution of local structures and the characteristics of their morphological forms in the study area. Current issue is also the issue of tracing tectonic disturbances and determining their screening ability, which determines the possibility of the existence of hydrocarbon deposits. Solving these issues will significantly improve the geological efficiency of exploration and prospecting in the areas of the Borislav-Pokutska zone. At the present stage of the development of Earth sciences, computer processing of geological data is widely used. Therefore, along with the traditional approach to describing structures as possible traps for oil and gas, it is necessary to analyze their quantitative (numerical) parameters, which allows us to more reasonably confirm the established patterns. The operation of large quantities of quantitative indicators of local structures and the dependencies established between them makes it possible to model the processes that formed them, and to determine the patterns of their distribution. The most important scientific and practical results include: the developed classification of local structures in the Borislav-Pokutska zone by quantitative indicators, which contains four groups of structures, depending on the morphological features of their structure; the investigated conditions for the formation of morphological varieties of local structures and the character of the distribution of tectonic deformations in them. Based on the results of geological and mathematical modeling by a set of quantitative indicators installed, that local structures with certain morphological features, which are reflected in varying degrees by the disruption of their shape, are formed by tectonic movements of different magnitude and direction and are described by their numerical parameters inherent only in them. The results of studies of the distribution of tectonic stresses and deformations, which can be estimated by quantitative indicators, will contribute to a more reliable forecasting of the oil and gas potential of the subsoil, which will significantly improve the geological performance of oil and gas prospecting in the areas of the Borislav-Pokutska zone of the Precarpathian deflection.</p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## STUDY OF THE APPLICATION FEATURES OF ORIENTED BHAS WHILE DRILLING DIRECTIONAL WELLS 2019-05-14T15:36:20+03:00 Igor Chudyk Andriy Livinsky Ахмед Аль Танакчі Andriy Pastukh <p>The article presents a scientific and practical approach for assessing the energy efficiency of oriented bottom hole assembly on the basis of mud motor. The main constructive feature of these assemblies is the presence of a bent angle in the bearing section of the mud motor. The conditions of operation of such assemblies are considered for a combined drilling method with a different number of stabilizers. Particular attention is paid to determining the causes of unproductive energy consumption for the work of oriented assemblies in the borehole.</p> <p>The mathematical model improved by the authors includes the geometric features of the construction of the assemblies, the bent angle on the bearing section of the motor to its body, the number of the stabilizers and the location of their installation, the borehole inclination, the physical and mechanical characteristics of the formation that forms it. Using these parameters, the calculation of the energy consumption for rotation and the axial displacement of the assemblies in the directional well was calculated based on the data of the deflection forces on the bit and the reaction on the stabilizers. According to these parameters, it is proposed to use the indicator of specific energy costs to overcome the forces and moments of the resistance of the environment during the drilling with oriented assemblies in the combined drilling method.</p> <p>According to the results of analytical research on the example of slick assemblies, as well as assemblies with one-and two-stabilizers, using the developed approach, the research of energy costs on the work of oriented assemblies with a different number of the stabilizers was conducted. It is established that oriented assemblies with two stabilizers are characterized by the highest values of the forces of resistance of axial displacement and rotation in the directional well, and also are the most energy-intensive systems in general. This limits their practical use as high-power, energy-consuming systems. The main factors in the formation of energy costs for the work of oriented assemblies in the combined drilling method are the number of the stabilizers and inclination range.</p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## EXPERIMENTAL RESEARCHES OF DYNAMICS OF TRENCHLESS RECONSTRUCTION OF PIPELINE COMMUNICATIONS TECHNOLOGY "TRACTION PIG" 2019-05-14T15:36:20+03:00 Yaroslav Doroshenko <p><em>The technology of the trenchless reconstruction of pipeline communications "Traction pig</em><em><sup>$</sup></em><em>" is described, which consists in the protrusion of a new polyethylene pipeline into a worn steel by a pig. The pig moves under the pressure of air, which is fed into the cavity space by the compressor. The interstitial space in the work trench is sealed with a sealing system.</em></p> <p><em>An experimental booth was developed and constructed to determine the resistance forces acting on the moving system during the reconstruction of pipeline communications using the “Traction pig</em><em><sup>$</sup></em><em>” technology. The principal scheme of the experimental stand is presented, the method of experimental research is developed. Experimentally determined the effort that is required to drain one linear meter of a polyethylene pipeline with a worn steel pipeline, the friction force of the pig cuff to the walls of the worn steel pipeline and the friction force of the polyethylene pipe in the cuffs of the sealing system. The sum of experimentally defined resistance forces acting on a moving system during the stroke of a new polyethylene pipeline into a worn steel is determined.</em></p> <p><em>An experimental installation for the experimental study of the dynamics of pulling a new polyethylene pipeline into a worn steel pig was developed and built. After performing the experimental tests it was established that the developed "Traction pig</em><em><sup>$</sup></em><em>" technology can be used for reconstruction of pipeline communications.</em></p> <p><em>Experimental studies were carried out for various inclinations of a worn steel pipeline to the horizon, different air flow rates, different external diameters of polyethylene pipes.</em></p> <p><em>The regularities of changing the air pressure at the beginning of the pipeline over time during the movement of the pig by a steel pipe and during the drainage of the polyethylene pipe with the worn steel pig have been determined experimentally. The regularities of changing the velocity of dragging depending on the volume air flow and dependence of the stretching speed on the length of the stretched section has been experimentally investigated.</em></p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## Influence of the system of areal placement of production and injection wells during the injection of nitrogen into the depleted gas reservoir on the gas recovery coefficient 2019-05-14T15:36:21+03:00 Lilya Khaidarova <p><em>T</em><em>he results of experimental and theoretical studies of the displacement of residual natural gas from depleted gas deposits by non-hydrocarbon gases are analyzed, and the use of nitrogen as a displacing agent is substantiated. The results of computer studies of areal injection of nitrogen into a hypothetical depleted gas reservoir are presented at 4, 5, 7 and 9 point well placement systems in the gas-bearing area and the distance from the central injection well to peripheral production wells 500, 750, 1000 and 1250 m.</em></p> <p><em>The significant effect of the well placement system on the gas bearing area and the distance between the injection and production wells on the gas recovery coefficient for residual gas and the duration of the additional development period at the time of nitrogen breakthrough into production wells and the nitrogen content in reservoir production is 5 % vol. A wide range of changes in their values ​​was obtained (for the gas recovery coefficient at the time of nitrogen breakthrough into production wells - from 6.92 to 56.44 %, for the duration of the deposit development process - from 4 to 49 months), which opens up possibilities for optimizing the system injection wells in the area of ​​gas-bearing deposits, taking into account the technological and technical and economic indicators of additional development of the reservoir. The obtained results are recommended to be used when designing the areal injection of nitrogen for the conditions of a real depleted gas reservoir.</em></p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## RESEARCH OF PROSPECTS TO PETROLEUM STREAM PUMPS DEVELOPMENT 2019-05-14T15:36:21+03:00 Olexander Panevnik <p>The tendencies of development of well borehole pumps serving for exploitation of oil fields are analyzed. The desire to optimize the process of mixing flows has led to the emergence of numerous designs of jet pumps, in which instead of direct-current twisted streams are used. Creation of circulating flows in the flow part of the jet pump contributes to the alignment of the velocities of the coaxial flows, intensifies the process of exchange of energies in the liquid, and increases the efficiency of the mixing process. The combination of direct and circulating flow of flow allows us to improve the technical characteristics of jet pumps up to 30%. The geometrical dimensions and the mutual orientation of the elements of the flow part of the jet pump have a decisive influence on the energy efficiency of the implementation of ejection technologies. Optimization of the geometric dimensions and orientation of the components of the jet pump necessitates multifactorial experimental studies, which, in addition to the design factors, should also take into account the operating regime of the ejection system in the well. The task of optimizing the design and regime parameters of a well eccentric system can be solved by simulating the working process of the jet pump using modern software complexes Solid Works and ANSYS, which provide the necessary accuracy of the calculation operations. The efficiency of the ejection system also depends on the depth of its installation in the well. Determining the optimum depth of installation of the ejection system in the well provides the use of iterative methods of calculation with the use of appropriate computer programs (for example, Matchad). The development of the hydrosploded operation of oil wells is characterized by the emergence of a tendency for a joint arrangement of the ejection system and traditional types of deep pumping equipment. In the design of the combined oil extraction system, the jet pump creates a low pressure zone on the wellbore and intensifies the flow of hydrocarbons from the productive horizon, while the traditional downhole pump transports them to the surface. The presence in the well of an additional (jet) pump optimizes the conditions of use of the main pump, which improves the energy characteristics of the bottom-set layout and increases the efficiency of oil production. Analysis of the application of hybrid ejection technologies indicates the prospect of this direction of development of oil and gas equipment.</p> <p>&nbsp;</p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## Designing the trajectory of a spatially distorted well 2019-06-10T16:27:45+03:00 Vasyl Vasylyovych Tokaruk <p>Natural spatial distortion is due to the non-conformity of the type of BHA to geological and technical conditions of drilling for a certain interval, as well as mistakes in conducting of geological exploration. The proposed method, which provides the maximum use of natural distortion and the use of orientated BHA of the bottom of the drill column. The main idea of this method is that the design of the well trajectory is in the direction from the center of the target area to the wellhead. The main areas from which the trajectory of a spatially distorted well with a section of large diameter in the upper intervals is described. The input data necessary for designing the profile is given. The method of calculating the drilling plot with the help of a non-oriented BHA, which consists of several cyclic repetitive operations, is described, with each subsequent interval of the wellbore interval being designed taking into account the change of the inclination and azimuth angles in the previous interval. The review of technical means for drilling the inclinations section is made using oriented BHA. In rotor drilling, the technical means and technology of oriented drilling are quite complex, therefore, dogleg with mud motors are more often used. As a result of calculating the trajectory of the well with different transition points between oriented and non-oriented BHA, on the axis parallel to the azimuth direction, an array of transition points from two-axis to single-axis BHA is formed. Based on the developed method, the authors created software that allows automating the process of designing the well trajectory, while taking into account the change of geology, technical parameters of wells construction and technological parameters of drilling. Using the proposed software, the design of a well trajectory was carried out with an attachment to certain geological drilling parameters.</p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## Determination of the input parameters of the work-stream of the oil-gas ejetor used simultaneously with the sucker-rod pump 2019-06-10T16:25:10+03:00 Olga Dubei <p><em>In order to calculate the operating mode of a sucker-rod pump driven by the beam pumping unit and a jet pump during their simultaneous operation, pressure and temperature distribution along the wellbore from the bottom to the wellhead was determined for the real oil well 753-D "Dolynanaftogaz" Field Office. Herein an improved methodology of calculating these parameters is used, which is based on known methods of Poettman-Carpenter and Baxendel. As a result, the imperfection of these methods was eliminated, namely the assumption that the characteristic of the pressure and temperature changing along the wellbore is linear. This led to obtaining more accurate results mainly for pressure values ​​up to 23%. In addition, using the algorithm for determining the density of an ideal gas-liquid mixture, the calculation of the gas-water-oil and water-oil mixtures’ velocities was conducted for a number of sections along the production tubing at different angles of the crank’s position in the beam pumping unit. The indicated values ​​make it possible to determine the location depth of the oil-gas jet pump in the well, and, consequently, the parameters at its input (pressure, temperature, velocity of the gas-liquid mixture, its density, etc.). Besides that, dependences, which describe the change in the density of the gas-liquid mixture along the wellbore, were obtained, as well as the relations between density of the free oil gas, the consumption gas content and the placement of the cross-section being considered.</em> <em>All of the above-mentioned algorithms were implemented using developed computer programs. The obtained results allow us to estimate the most advantageous location of the jet pump in the well to ensure that they maximize the pressure gain and reduce the load on the stem.</em></p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## Influence of carbonic acid ammonium salts on the filtration properties of bottom-hole formation zone 2019-06-10T16:29:53+03:00 Viktoriya Dmytrenko <p>The possibility of&nbsp; using ammonium carbonates for increase hydrocarbons extraction&nbsp; is considered. Experimental studies have been carried out to study the effect of ammonium carbonate salts on the reservoir filtration properties. It has been established that carbon dioxide ammonium salts, in the absence of calcium chloride water, interact with carbonate rocks, increase the absolute permeability of reservoirs. Solutions of ammonium carbonate salts interact with potassium chloride and form chemically precipitated chalk in the pores of the rock. Аt the same time, the permeability of carbonate rocks decreases.</p> <p>Industrial tests of ammonium carbonate salts showed an increase in gas flow rate by 30-50% at wells № 23 of Oposhnyansky, № 115 of Mashevsky, № 3 of Timofeyevsky gas condensate fields. The effect of the formation treatment with carbonic ammonium salts is conditioned by the purification of the reservoir catchment zone and an increase in the collector absolute permeability. In wells number 56, 108 Yablunivsky and 58 Timofeevsky gas condensate deposits, an increase in the condensation factor observed at 22-35%. The efficiency of the treatment is related to the simultaneous cleaning of the gravel zone from asphalt-resinous contaminants and to the absolute permeability increase, as well as to the pore space hydrophilization and the increase in condensate the mobility that has fallen as a result of its action on carbon dioxide, which was isolated as a result of decomposition of carbonic salts ammonium. So pilot tests at Oposhnyansky, Mashevsky, Timofeevsky, Yablunovsky gas and condensate fields of the Poltava region confirmed the effectiveness of using ammonium carbonate salts to increase hydrocarbon production.</p> <p>The prospect of further research is aimed at developing a technology for increasing the liquid hydrocarbons production through the use of carbon monoxide salts.</p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement## Calculation of Stretching and Bending Stress in a Casing String Installed in a Well with a Complex Profile 2019-06-10T16:31:56+03:00 Igor Paliychuk <p><em>The casing column in the curvilinear well is represented as a long continuous elastic rod. It has a vertically acting weight, which is evenly distributed along the length and creates variable axial tensile forces in the column body. At the same time, it is influenced by the reaction forces of the borehole walls, which, together with the weight, bend the column of initially straight pipes. Here is assumed that the casing axis replicates the axis of the bent borehole, and the walls reaction is continuously distributed along the length according to a certain law, which, together with the weight, bends the column of the initially straight pipes. A system of differential equilibrium equations of internal and external forces and moments was composed, which was supplemented down to a closed form with a differential equation of curvature. This system describes large deformations of a long elastic rod in one plane. An introduction of the distributed weights, wall reactions and resistance forces into the calculation makes it non-uniform. Its feature is the need to solve the inverse problem. Here are known the external load and rod deformations, which are defined by the well shape in the form of an inclinometric data table. The unknown internal forces and the function of the walls reaction, which creates its predetermined shape, must be determined. It is established that this function depends on the distribution of axial forces caused by weight and resistance forces. As a result, the system was reduced to a linear inhomogeneous differential equation with variable coefficients of the first order with respect to the axial force and its solution was obtained as a sum of integrals. It is shown that one of them can be found in quadratures only in the case of a constant radius of curvature of the well. This necessitated the use of numerical integration methods. Formulas for the distribution of axial forces and bending moments in the body of the column, as well as the reactions of the walls leading the column to the actual well profile are obtained from the solution of the basic equation. To calculate these force factors, a method for numerical integration of inclinometric measurements data and software for numerical analysis of a real well are developed. This technique allows to detect the areas of local increase of the curvature and difficult passage of the curvilinear wellbore and calculate the main parameters of the stress-strain state of the casing column in it.</em></p> 2019-03-29T00:00:00+02:00 ##submission.copyrightStatement##