The research relevance of the structure of deep oil and gas horizons' hydrogeochemical fields in Western Siberia is associated with applied and fundamental issues of oil and gas hydrogeology. The article presents the hydrogeochemical field analysis results of the LowerMiddle Jurassic hydrogeological complex, the Em-Egovsky oil field, which is part of the Krasnoleninsk fields group. The research aim was to establish the reasons for the contrast formation in the hydrogeochemical deposit field. We analyzed ion-salt composition of waters over the area (mainly groundwaters belong to the hydrocarbonate-sodium type according to V. A. Sulin) and revealed a fairly large scatter of salinity values (from 4.5 to 16.1 g/dm³ , with an average value of 8.6 g/dm³ ). Study of the genetic sodium-chloride behavior (values vary from 0.9 to 1.4 with an average of 1.1) and chlorine-bromine coefficients (values vary from 105 to 254.6 with an average of 177.2) in groundwater in combination with the analysis of paleogeographic and tectonic allowed classifying waters as sedimentogenic, undergone significant metamorphization. The conditions for the waters formation made it possible to classify the waters as sedimentogenic, after significant metamorphization. The study of the deposit temperature field gave grounds to assume that one of the reasons for the hydrogeochemical field contrast is the inflow of deep fluids from the basement along faults. In addition, the structure of the hydrogeochemical field was significantly influenced by its formation in the environment of a lithostatic water pumping system and by the feeding province - the Ural framing.

Solutions for finding the natural electric potential from polarized oblique-angled (4-sided with complete asymmetry) and polyhedral electron-conducting bodies found in nature are performed. An oblique body is a layer with different angles of inclination of its upper edge and side faces, i.e. a body that has complete asymmetry. A theoretical search of various combinations of the angles of inclination of the faces and the lengths of these faces allows you to select an anomaly of the electric potential for tetrahedral bodies of any complexity. A polyhedral body is an 8-sided one that approximates a sphere fairly accurately at a distance of one or more internal radii from its surface. Solutions for polarized oblique-angled (4-sided) and polyhedral electronconducting bodies are tested on examples of interpretation of anomalies of the natural electric potential observed over real ore objects. As a result, the solutions obtained expand the possibilities of the natural electric field method in solving inversion problems and, thereby, increase its efficiency.

This article is devoted to the study of the effect of the capillary pressure jump (CPJ) on the phase equilibrium between the liquid and gas phases, which are described by the Peng-Robinson equation of state. A numerical analysis the form of phase diagrams (PD) of a gascondensate mixture at various CPJ is carried out. Based on the specifics of the problem, the PD is constructed in the gas pressure - liquid pressure coordinates. The boundary of the two-phase region is defined as the region of existence of the two-phase state of the mixture, without additional studies on the stability of the single-phase state. The analysis is carried out without reference to any specific porous medium, and it is based on the conditions of phase equilibrium at different CPJ only. The obtained results demonstrate the importance of CPJ effects in computing the phase equilibrium of a gas-condensate mixture, when modeling the flow in a porous medium. The described computational and theoretical technique is applicable to two-phase multicomponent systems with an arbitrary number of components and is easily generalized to other equations of state, such as the Redlich-Kwong equation, equations of state of gas condensate systems.

The article objectives are developing hard-to-recover reservoirs and how to maximize oil production by formulating effective solutions for putting hard-to-recover reserves. US₂ is planned to be put into development in 2022 and contains 52% of the initial reserves of the entire field. US₂ reservoir complicated by low permeability 0.6 mD, saturated intervals are 9.8 m. The main method of developing hard-to-recover reserves in Western Siberia fields is horizontal drilling with multi-stage hydraulic fracturing. As a matter of course, well designs were analyzed with different lengths of horizontal shaft and with a different number of hydraulic fracturing ports. Calculations of starting flow rates and production profiles for various well options for a typical well have been performed. The optimal solution was evaluated using the complex parameter NPV and cumulative production.

A comprehensive systematization of the features of the safety control process, potential threat factors, automation of monitoring the state of operation of hazardous production facilities of the gas transmission system, in accordance with the main potentially hazardous manmade impacts on the environment, has been carried out. Methodological, algorithmic and software were developed to ensure organizational and technical measures for environmental and industrial safety in accordance with modern requirements for monitoring the state of facilities and identifying emergency situations. The article is devoted to the creation of a system for automated monitoring of the operation of the state of HPF systems as a modern tool for industrial safety management during the operation of man-made facilities at enterprises of the fuel and energy complex. It is one of the most important modern problems of support. We have proposed mechanisms to control and reduce the risks of emergencies at HPFs, justified algorithms and provisions for creating an array of "big data" and modern information systems for analyzing the risk of accidents, as well as preventing and eliminating emergencies.

Ensuring the reliability of operation of main gas pipelines from the moment of their construction is an important problem, which is associated with emergency situations on highways and failures in their operation. Such situations lead not only to large economic losses, but also to large-scale environmental consequences. The solution to the problem is the correct formulation of the problem, which consists in quantifying the main pipelines and monitoring the territory in which they are located. Monitoring of the territory includes the study of natural and climatic conditions. Using the data obtained, it is possible to determine the operating standards for linear highways. Because of the spread of permafrost on it, the territory of the Far North is the most vulnerable than other territories with hydrocarbon deposits. The condition of the pipeline decreases every year, so their resource is not eternal. It leads to the risk of accidents. The largest number of gas fields and linear pipelines are located in areas with unstable soils, heaving mounds, and permafrost. It is necessary to conduct a comprehensive monitoring of the territory, engineering surveys, construction and operation of gas facilities in order to the design, construct and operate such facilities effectively.

The use of enhanced oil recovery (EOR) methods has a significant impact on the current level of hydrocarbon production. Therefore, the issue of maintaining the high efficiency of their application remains relevant at all stages of field development. Currently, in the field of flow diverting technologies (FDT) and technologies for leveling the injectivity profile many different reagents and compositions of EOR have been developed, as well as approaches and methods of their application. The choice of using certain methods of influencing a productive formation depends on its geological and physical conditions (HFC), therefore, the correctness of this choice has a direct impact on the effectiveness of the use of EOR technologies. This article is devoted to an analysis of the effect of certain HFCs on the efficiency of FDT use with the use of GFS gel-forming systems, heat-resistant GFS (T) gel-forming systems and GFS-1AS gel-forming systems with fillers. As a result of the analytical work carried out, the main trends in the efficiency of the application of the above technologies were predetermined from different indicators, such as the effective thickness of the formation, its reservoir properties, the volume of injected reagents, the compartmentalization of the formation, the injectivity of wells before treatment and the change in their mode of operation after treatment. The main conclusion, which is obtained based on the results of the work carried out, is that at the moment there is a need to search for or develop new approaches to the implementation of physical and chemical enhanced oil recovery methods, which will allow solving two main problems: improving the rheological characteristics of cross-linked polymer systems and reducing the cost of the work performed.

In the oil and gas industry, several problems can be identified that affect the subsequent rates of development of the relevant industry: low quality of oil products and low rates of application of new technologies, which directly slows down the country's economic component. Currently, the development of multiphase flow meters is underway, however, the creation of a universal device is still an unsolved problem, and the existing developments require calibrations. The main problem in calculating the flow rate of the fluid is the determination of the density of the components of the passing mixture. The use of X-ray radiation allows you to solve most of the technical problems, as well as to determine the density with a high accuracy. Flow meters using this concept are of little use. The purpose of the study of our work is to update the applicability of the use of the X-ray range in determining the density of the passing flow. In the course of the work, a search and analysis of tabular data characterizing the interaction of radiation with matter was carried out, according to the results of which acceptable sources of characteristic radiation were determined. In the next step, we modeled the structure of the fluid and derived a system of equations that allows one to determine the densities using existing instruments, as well as constants that are determined experimentally. The result of the research is a solvable system of equations, as well as primary modeling and determination of the component, quantitative composition of the gas-liquid mixture under consideration in laminar flow. The result of this work is to obtain a theoretical confirmation of the relevance of using the device based on this concept, the subsequent addition of characteristic radiation detectors will also help to determine the chemical composition of the fluid.