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The oil field X belongs to the category of large in terms of initial recoverable reserves, multi-layer and complex in geological structure. The US1 object accounts for 20,3 % of the initial recoverable reserves, while the selection from the initial recoverable reserves is only 11,4 %, this makes object the most promising from the point of planning further development of the field. The analysis presented in the article is aimed at identifying problems and features of the development. During the analysis, we noted low reservoir properties of the object, high watercut of the produced products, the deterioration of the energy state of the deposits, which manifests itself in the form of a decrease in dynamic levels and a decrease in fluid flow rate. Drilling of wells, both production and injection, was carried out using hydraulic fracturing technology. Given the fact that the deposits of the US1 object are closed, lithological shielded and are characterized by the absence of an oil-water zone, the watering of wells, according to the our opinion, is associated with pulling up water from the underlying water-saturated formation as a result of the propagation of cracks obtained during hydraulic fracturing. The reason for the deterioration of the energy state is the commissioning of injection wells using hydraulic fracturing and the withdrawal of water through hydraulic fracture in the underlying formation.
The oil field X belongs to the category of large in terms of initial recoverable reserves, multi-layer and complex in geological structure. The US1 object accounts for 20,3 % of the initial recoverable reserves, while the selection from the initial recoverable reserves is only 11,4 %, this makes object the most promising from the point of planning further development of the field. The analysis presented in the article is aimed at identifying problems and features of the development. During the analysis, we noted low reservoir properties of the object, high watercut of the produced products, the deterioration of the energy state of the deposits, which manifests itself in the form of a decrease in dynamic levels and a decrease in fluid flow rate. Drilling of wells, both production and injection, was carried out using hydraulic fracturing technology. Given the fact that the deposits of the US1 object are closed, lithological shielded and are characterized by the absence of an oil-water zone, the watering of wells, according to the our opinion, is associated with pulling up water from the underlying water-saturated formation as a result of the propagation of cracks obtained during hydraulic fracturing. The reason for the deterioration of the energy state is the commissioning of injection wells using hydraulic fracturing and the withdrawal of water through hydraulic fracture in the underlying formation.
The article is devoted to the regularities of the propagation of self-induced hydraulic fracturing cracks in the process of injection of the displacement agent into the formation in order to maintain reservoir pressure. Technogenic and petrological factors have a significant impact on the processes of initiation, propagation and degradation of self-induced hydraulic fracturing cracks. In modern oil and gas field practice, we are just beginning to use geomechanical simulators for private calculations and have not yet used them in integrated calculations of field development options, nevertheless, the influence of geomechanical processes of the spread of man-made cracks makes a significant contribution to the field development indicators. The aim of the study is a complex of factors that prevent and contribute to the development of self-induced hydraulic fracturing cracks. The study uses the author's methodology for estimating the crack length of a selfinduced hydraulic fracturing depending on the downhole pressure in the injection well. The results of the work have developed a classification of factors influencing the development of self-induced hydraulic fracturing cracks, a quantitative analysis of the differences in the characteristics of the spread of man-made cracks for two deposits with different geomechanical and hydrodynamic properties. The work makes a significant contribution to the understanding of the laws of the development of man-made cracks and has broad prospects for development, allowing us to significantly improve the current 3D digital models and analytical filtration models, which will improve the production of field reserves and increase the value of the oil recovery factor.
The construction of a produced water management (PWM) system relies on a Step-rate-test strategy that integrates a novel technology for treating the bottomhole formation zone and adjacent fractures resulting from prior hydraulic fracturing. Step-rate-test technology is considered more environmentally friendly than hydraulic fracturing for several reasons. It doesn't require crosslinkers or proppants, and there is no discharge of liquids or other reagents onto the terrain or into water basins. This article discusses technical approaches to solving field service problems in injection wells. One of the strategies for managing produced water injection is Step-rate-test, which is considered the best choice in these operations. This strategy can also be used to solve the problem of disposing of excess fluid or waste after hydraulic fracturing. Advances in modelling, operation, monitoring, and evaluation provide the basis for minimising costs and preserving the environment. The connection between the object of work and the engineering works is established through quality targets and pumping requirements. Field example, such as Tevlinsko-Russkinskoye and Yuzhno-Yagunskoye, and results of data mining of them, demonstrate the significant impact of data differences on site selection. Field data indicates that injectivity decreases in matrix injection structures despite the injection of prepared fluid. It is acceptable to inject the fluid without prior preparation, provided that there is no well pad pump station, pipe end phase divider or similar equipment. The majority of rock structures become fractured during fluid injection, which affects the selection of technical equipment for the process. This article evaluates the propagation of fractures during the injection of prepared and unprepared fluids and their impact on well performance.
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