Coalbed methane mining method with regulation and control of desorption and diffusion

Abstract

A low-cost and high-efficiency coalbed methane development solution including regulating the desorption and diffusion of coalbed methane. It consists of three parts: wellhead equipment, remote control system and system control algorithm. N wells comprehensively form a network to monitor and manage the entire mining area. In the gas area, modern technologies such as infrasonic wave, matrix control, and big data are comprehensively used to control the desorption and diffusion gas recovery of the regional coal seam as a whole to achieve the best results. By controlling the wellhead equipment to produce gas at a frequency below the audible sound wave (including infrasonic wave), the coal seam can be continuously and uninterruptedly applied to the coal seam with a certain period of fluctuating pressure, so that the coal seam microstructure can be produced under the action of this force. Periodic elastic contraction and diastolic micro-deformation, changing different frequencies and unit overall drive schemes, searching and refining unit desorption and diffusion characteristics, tracking the characteristics to find the best period data, using the best period data to activate formation energy, so as to achieve low-cost and rapid coal seam recovery purpose of anger.

Description

technical field [0001] The invention belongs to the technical field of underground energy mining, and in particular relates to a high-efficiency mining method for coal bed gas. Background technique [0002] Coalbed methane is a clean and environmentally friendly energy with abundant reserves. However, judging from the development of the United States and China, the relatively easy-to-exploit reserves only account for about 10%, and 90% of the coalbed methane is difficult to mine. To develop natural gas as a resource, it is necessary to solve the mining technical problems of difficult-to-recover coalbed methane. [0003] The existing drainage and depressurization gas recovery technology completes a series of processes such as desorption→diffusion→seepage→gas production. Slowest of the first 3 steps. [0004] For difficult-to-recover CBM wells, after the initial drainage period, little or no water is produced, and the gas production enters a relatively stable period, which i...

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Problems solved by technology

[0014] The present invention is proposed to solve the existing problems, and the purpose is to provide a comprehensive development solution with the function of regulating and controlling the desorption and diffusion of coalbed methane, so as to achieve the goal of economically and efficiently exploiting coalbed methane

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