Method for improving shale gas well recovery ratio on basis of air knocking

Abstract

The invention discloses a method for improving the shale gas well recovery ratio on basis of air knocking, by which an air knocking method is applied to crack a shale gas well to improve the shale gas well recovery ratio. High-pressure air in a high-pressure air storage bottle on the ground is delivered to an underground high-pressure air gun through a series of pipelines, a ground controller is pressed to give out a series of commands, the high-pressure air gun quickly releases the air to generate underground high-pressure air knocking, so a series of high-pressure air pulse vibrations are formed to be exerted on a shale, the pulse vibrations are superposed in the shale, conditions under which pressing and expanding are generated are formed at the shale part, the tail end of the internal micropore of the shale is continuously cracked and expanded to form shale gaps and cracks, thus, the shale gas dispersion and desorption processes are accelerated, so that the shale gas well recovery ratio is improved.

Description

technical field [0001] The invention relates to a method for improving the recovery rate of shale gas wells, which uses the air detonation method to improve the recovery of shale gas wells [0002] rate method. Background technique [0003] Shale gas refers to unconventional natural gas that occurs in organic-rich mud shale and its interlayers, mainly in the form of adsorption or free, and its main component is methane. In recent years, breakthroughs have been made in the exploration and development of shale gas in the United States. , the rapid growth of production and the realization of its "natural gas revolution" have had a major impact on the international natural gas market and the world's energy structure. The world's major resource countries have joined in the exploration and development of shale gas. [0004] Organic-rich shale is widely distributed in China. Marine shale is developed in South China, North China and Tarim Basin in Xinjiang. Continental shale is wid...

AI Technical Summary

Problems solved by technology

[0006] 1. The process is complicated, the construction is difficult, and the project cost is very high. Generally, a well costs tens of millions of yuan;

[0007] 2. The water consumption is huge. Generally, more than 10,000 cubic meters of water is required for fracturing a well, especially in the mountains and hills in southern my country, so it is very difficult to supply water alone;

[0008] 3. The fracturing fluid pollutes the groundwater seriously, which does not meet the current environmental protection requirements;

[0010] 5. The scale of ground fracturing equipment is huge, and the performance requirements of the equipment are high, and the fracture creation capacity is not enough, so it cannot effectively increase the production of shale gas wells

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