编号 1 (2024)
Opening remarks by the Rector
Oil and Gas Studies. 2024;(1):11-13
11-13
GEOLOGY, PROSPECTING AND EXPLORATION OF OIL AND GAS FIELDS
Factors аffecting mineralization of groundwater in deep oil and gas bearing horizons in the western part of the West Siberian megabasin
摘要
The purpose of this study was to identify the causes of the observed hydrogeochemical situation and the factors contributing to its formation within the Middle Jurassic hydrogeological complex in the western part of the West Siberian megabasin, using the Talinskoye oil field as an example. The research primarily involved constructing dependencies between mineralization (y) and various factors including porosity, reservoir pressure, modern and paleotemperature of the foundation, and depth of the foundation (x). The study evaluated the degree of connection between each parameter and mineralisation. The results showed that the initial hydrochemical state in the area is heterogeneous, with significant variations in mineralisation levels within a single reservoir. The closest dependencies have been revealed between mineralization and porosity of reservoir rocks (an inverse dependence), mineralization and reservoir pressure (a direct dependence). The practical significance of the study is justified by the need to understand the nature of the formation of the hydrogeochemical environment in order to preserve it, control changes, as well as solve issues related to the forecasting, preservation, and destruction of oil deposits.
Oil and Gas Studies. 2024;(1):14-29
14-29
Temporal variability of water chemistry in the Cherkashinskaya well No. 36-RG (Tobolsk district, Tyumen region)
摘要
This article focuses on a temporary change in the chemical composition of water in the Cherkashinskaya well No. 36-RG, which is located in the Tobolsk district near the village of Shestakovo. The impact of underground mineral waters on catchments and watercourses can be caused by the open gushing of orphaned geological exploration wells. This can lead to the disturbance of the hydrochemical regime of neighbouring water systems. Publications on this topic are available not only in Tyumen region, but also throughout the Russian Federation. For example, scientific articles and conference proceedings, such as "Groundwater of the East of Russia" (2018), "Issues of studying surface and groundwater of Siberia" (2021), and the International Conference "Underground Waters 2023", are available. The study highlights the behavior of various components of water composition. The article presents changes in the mineralization of groundwater and identifies the main sources of negative impact on its quality. In 2019, the chemical composition of the water in the containing well underwent a transformation. This article focuses on the changes in the chemical composition of water from the Cherkashinskaya well No. 36-RG and its impact on the surrounding areas.
Oil and Gas Studies. 2024;(1):30-41
30-41
Justification of the approach to searching for and exploring productive objects: a case study of the Krasnoleninsk and Angaro-Lena oil and gas regions
摘要
The article provides a rationale for the approach to the search and exploration of local productive zones based on the analysis of geographically distant objects of different geological structures: the Tyumen and Chora formations. The need for a joint study of the problem of localizing oil and gas deposits has been identified by comparing the patterns of location of local productive objects in remote territories that differ in their geological structure. The relevance of the study is determined by the significant degree of depletion of reserves of hydrocarbon deposits, characterized by the simplest development conditions and the need to find an approach to the study of deposits, within which the establishment and description of the patterns of deposit structure cause difficulties. The primary information for the study was drilling data, geophysical well survey results, description of core material, petrophysical survey data, information on testing and well performance dynamics, 2D seismic interpretation materials, as well as published articles. Methods of analysis and comparison were adopted as a basis in order to highlight common features of the distribution of hydrocarbon deposits in the studied areas. In the course of the study, the prerequisites were formed for the development of a comprehensive methodology for studying the structure of hydrocarbon deposits of Tyumen and Chora formations from the perspective of an approach to the exploration of complex objects, implying a joint study of the possibilities of processes described separately by both organic and inorganic hypotheses of oil and gas generation. The need to introduce an approach to geological modeling that takes into account the fractal structure of geological systems is formulated.
Oil and Gas Studies. 2024;(1):42-58
42-58
The impact of rock filtration heterogeneity on fresh groundwater reserve prediction calculations in the Nefteyuganskoye field
摘要
In hydrogeology, filtration heterogeneity of rocks usually means heterogeneity of waterconductivity of an aquifer. Methods for determining water conductivity are primarily designed forhomogeneous aquifers. However, natural hydrogeological objects are often heterogeneous, whichcan complicate the interpretation of experimental data from hydrodynamic studies and lead toerrors in calculating groundwater reserves. The article shows the impact of rock filtration hetero-geneity on reserve calculation forecasts. The studies, including hydrodynamic testing (clusterpumping), were carried out at the Nefteyuganskoye field, which is one of the major fresh ground-water deposits of the Latitudinal Ob region. The experimental data from four experiments wereinterpreted using the Theis model. The parameters of the aquifer are determined: coefficient ofwater conductivity and pressure conductivity factor. The article presents predictive calculations forthe reduction of water levels in the center of a large well. The forecast was conducted for threeoptions, taking into account the filtration heterogeneity of the aquifer in the field. Consequently,the impact of filtration heterogeneity on the forecast calculations was determined. The calculationerror in estimating groundwater reserves at the Nefteyuganskoye field could be as high as 51 %.The article suggests conducting long-term hydrodynamic studies in subsurface areas with filtrationheterogeneity to obtain reliable field parameters. This will cover the disturbance of an aquifer with alarger size than the filtration heterogeneity of rocks.
Oil and Gas Studies. 2024;(1):59-70
59-70
DRILLING OF WELLS AND FIELDS DEVELOPMENT
Step-rate-test as one of the strategies for managing formation water injection. Design and monitoring
摘要
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.
Oil and Gas Studies. 2024;(1):71-79
71-79
The use of clay from the Herpegezh deposit for the production of ready-made compositions for the preparation of drilling fluids
摘要
The preparation of drilling fluids from ready-made compositions allows you to reduce costs, including by obtaining the drilling mud of the required composition with an optimal consumption of reagents, simplifying technological equipment and reducing requirements for the qualification of maintenance personnel. One of the most common components of drilling fluids are clays, therefore, one of the important tasks is to study clays from various deposits in order to establish the possibility of their use in the production of compositions for the preparation of drilling fluids. The purpose of this study was to establish the chemical and technological characteristics of the clays of the Herpegezh deposit and to develop recommendations for the preparation of finished compositions. Particular attention was paid to the choice of the method of activation of raw materials, ensuring the maximum possible productivity, in particular, the traditional method of activation and mechanical activation in the disintegrator were compared. Also, as a result of the conducted experiments and processing of their results, the dependences of the technological characteristics of the drilling mud prepared from the Herpegezh clays on the mass fraction of the clay substance were established.
Oil and Gas Studies. 2024;(1):80-91
80-91
A statistical analysis and decision-making to enhance the effectiveness of measures for water influx in production wells under conditions of uncertainty
摘要
This article focuses on modelling and statistically analysing models that express the relationship between efficiency indicators and multiple geological and technological factors. Efficiency indicators include parameters such as the duration of the effect, the volume of additionally extracted oil, the volume of restricted water, and the well's profit considering polymer costs. The article presents multiple equations derived from data processing and analysis. It demonstrates techniques for evaluating the contributions of each factor in determining the values of the output variables. The adequacy and reliability of the models are evaluated using appropriate criteria.
Oil and Gas Studies. 2024;(1):92-107
92-107
ORGANIZATION OF PRODUCTION AND ENSURING THE SAFETY AND ENVIRONMENTAL FRIENDLINESS OF PRODUCTION PROCESSES IN THE OIL AND GAS INDUSTRY
Impact assessment of the fuel and energy complex on the ecological state of the Gulf of Ob waters
摘要
Ensuring environmental safety in the Arctic, where most large hydrocarbon deposits are concentrated, is one of the main problems of the 21st century. At the same time, the Gulf of Ob is a strategically important area where grandiose energy resource and transport projects are being implemented. An important indicator of environmental safety is the research of atmospheric impurities on the surface of the large bay of the Kara Sea, which has not been sufficiently studied to date. The purpose of the research is to assess the impact of the activities of the fuel and energy complex on the ecological state of the waters of the Gulf of Ob for 2016-2020 using geographic information systems. The Earth program was used in the research; statistical processing of the results was carried out using IBM SPSS Statistics 21 software. It has been established that in the winter period of the year, in contrast to the summer, on the surface of the water area of the Gulf of Ob there is a significant increase in the concentration of gaseous impurities and a decrease in suspended particles, especially over the water area of the Gulf of Ob at the northern latitude of 68.80º an area of intensive gas production. Moreover, in the summer, the content of suspended particles (PM1, PM2.5, PM10), as well as the CO concentration at this latitude were higher compared to the more northern latitude. Thus, the intensive development of the fuel and energy complex in this region is associated with an environmental component (carbon footprint) on the surface of the Gulf of Ob, which requires a more in-depth research within the carbon polygon.
Oil and Gas Studies. 2024;(1):119-130
119-130
MACHINERY, EQUIPMENT AND FIELD CONSTRUCTION
A hydraulic drive with self-oscillating operation for reciprocating downhole pump
摘要
Rod pumps (pumping units) are widely used for pumping products from production wells. Their simplicity and low cost are undoubted advantages. However, when operating in inclined wells, these pumps are susceptible to accidents caused by friction forces between the rod string and oil well tubing in the contact zone, particularly when the well axis is bent. The rod and rope drive for the plunger pump is suitable for use in wells with a slight inclination of up to 15°, but it is not suitable for use in deviated wells. The article aims to evaluate the feasibility of discontinuing the use of the rod drive in deep well plunger pumps and to suggest an alternative solution. One of the options considered is a self-oscillating hydraulic drive with a spool switch located inside the piston of the drive hydraulic cylinder. This drive provides the large rod displacement necessary to operate a plunger well pump. To supply the working fluid to the distributor, a hollow rod is used. The rod is pressurized with a pressure higher than the downhole pressure from the pump located on the surface near the wellhead through the oil well tubing. A piston switch with an original design is proposed, which provides a self-oscillating mode of the drive and allows for changing the oscillation period. The methods for changing the oscillation period are briefly discussed. A mathematical model of the hydraulic drive is compiled, and the dynamic and power characteristics are determined. The design is developed, and a mockup of the drive and a bench for testing are created. The test results confirm the theoretical characteristics and reliability of the drive. The use of a self-oscillating hydraulic drive for plunger well pumps enables their application in wells of any curvature.
Oil and Gas Studies. 2024;(1):108-118
108-118