ANALYSIS OF THE PECULIARITIES OF APPLICATION OF CAPILLARY SYSTEMS IN GAS WELLS OF THE CARPATHIAN FIELDS

Abstract

During the operation of gas and gas condensate wells, especially at the late stage of field development, complications may arise due to fluid accumulation at the bottom hole or in low-lying areas of the wellhead route. Therefore, an important reserve to reduce the rate of decline in gas production and increase the final gas recovery factor is to extend the period of stable operation of watered wells by applying effective methods of their operation. The purpose of the study was to highlight innovative technological solutions and the results of their implementation in real industrial conditions at natural hydrocarbon production facilities. The tasks were solved by analyzing and comparing the effectiveness of both domestic and foreign methods of combating the accumulation of formation fluid at the bottom of wells. The proposed methods are based both on reducing the flow of fluid to the bottomhole and on its removal to the surface from the well. In the context of this work, we present a method for removing fluid from the bottomhole using foaming surfactants. To supply liquid surfactants, the following are used: an inhibitor tank, an inhibitor pipeline, a pumping unit, and an automatic surfactant supply system. The supply of solid surfactants can be realized through the buffer valve of the fountain valve in manual mode or using a special system for supplying solid surfactants. The paper also describes the sequence of operations for supplying surfactants to the well through a quick coupling nut and an inhibitor tank. The main focus of the article is on the surfactant supply using an automatic supply system. The surface and underground equipment used in the automatic feeding system is presented, and various options for feeding chemicals into the well are considered. A number of the studied wells show the peculiarities of their operation before and after the installation of an automatic surfactant supply system at the bottom hole. The article discusses in detail the positive and negative aspects of the automatic surfactant supply system in the wells of the Precarpathian fields. Based on the results of the performed studies, it is recommended to apply in practice the supply of foaming surfactants by an automatic supply system in wells of the Precarpathian deposits.