Rational use of associated petroleum gas (APG) is the most important task of the oil industry. One of the options for its solution can be the use of pump-ejector systems for injecting APG together with water into the reservoir when implementing simultaneous water and gas injection (SWAG) in order to increase oil sweeping. However, the problem of increasing the pressure developed by the pump-ejector system is currently insufficiently studied issue. This paper presents an improved layout of the pump-ejector system, recommendations for the optimal composition of the working fluid, as well as the calculation of the system for the conditions of one of the fields in the Ural-Volga region.

This study is devoted to the problems of irrational combustion of petroleum gas. The problems of introducing APG application methods are indicated, the methods of using gas in the fields are analyzed. The analysis of the data made it possible to establish that the harmful effect can be reduced by injecting oil gas into the reservoir with water in the form of a water-gas mixture (SWAG-technology). Exhaust or flue gases can also be used. Flue gases emitted during the flaring of associated petroleum gas can also be captured and injected as a water-gas mixture. Pump-ejector systems are proposed as a technical solution.

This article provides an overview of the results of studies of water-gas methods and carbon dioxide generation in reservoir conditions as methods for increasing oil recovery. It is shown that the efficiency of technology implementation is influenced by the choice of technical device and the composition of the selected agents selected for injection into the reservoir. The effectiveness of the implementation of these methods is directly influenced by reservoir conditions (pressure and temperature), as well as the mineralization composition of the liquid phase (injected in the form of a water-gas mixture or formation water). It turned out that in the case of an optimal mineralization composition of the liquid, the technological efficiency of the methods increases. In other cases, it is necessary the composition and concentration of surfactants are given. Recommendations on the composition and concentration of surfactants are given. To implement methods in a specific field, it is recommended to conduct laboratory studies to determine the optimal composition of the agent acting on hydrocarbon-saturated rock.