Pilot testing of development wells technology to restore performance

Issues in focus. The paper deals with a topical issues related to the development of depleted reservoir wells. To develop wells with low reservoir pressures, different technologies are used that involve the use of new equipment. Objective. Experimentally investigate the technology of wells exploration at the final stages of development. To obtain reservoir fluid at low reservoir pressures, it is important to choose the optimal well development technology. Methods of implementation. Specialists of the Ukrainian Scientific Research Institute of Natural Gases have developed a device for foam production and well development. By applying it, foam can be obtained to remove the fluid from the bottom and the well shaft, which will restore the wells performance. The design and operation principle of this device have been developed. Experimental and industrial tests of exploration of gas-condensate wells technology using foam were carried out. Research results. As a result of the exploration work, fluid was removed from the wells by injection of non-explosive gas mixture and foam. During the work, the pipe and annulus pressures were monitored as well as the output of the well at the flare barn. After injection of the foam formed from the solution of surfactants, the pumping unit was stopped, while the non-explosion gas mixture was continued to be pumped by mobile nitrogen compressor stations. The foam was injected at intervals, defined by individual plan of work. At the end of the of foam (liquid) flow on the flare barn, the development work was stopped. The pipe and annulus pressures and also their growth were monitored. The well was commissioned and the parameters of its operation were monitored. Based on the measured production capacity of the wells, an increase in gas flow was obtained. Conclusions. Thanks to the presented technology of wells development it is possible to achieve a positive result on the depleted gas condensate fields. The industrial application of the development technology in practice will allow to achieve the expected wells flow rate and to provide stable production of hydrocarbons