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Coal bed methane extraction method capable of regulating and controlling desorption and diffusion

A diffusion method, a technology for coalbed methane development, applied in the field of underground energy mining

Active Publication Date: 2017-02-15
北京昊科航科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Coal bed methane extraction method capable of regulating and controlling desorption and diffusion
  • Coal bed methane extraction method capable of regulating and controlling desorption and diffusion

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Embodiment Construction

[0043] To implement the coalbed methane mining method for regulating and controlling desorption and diffusion of the present invention, relevant implementation plans should be formulated according to the geological conditions of the coal seam on site. First, a small number of experimental wells should be selected for preliminary test evaluation, and then gradually expanded.

[0044] Before the test, the following features of the present invention should be fully considered:

[0045] 1. Because the frequency of the pressure wave is very low, it will travel far in the coal seam. When the microstructure of the coal seam absorbs the pressure wave, there will be an opportunity for wave trough superposition. This wave trough superposition will promote the desorption and cutting of coalbed methane. The expansion and connection of management and cracks;

[0046] 2. Since the fluctuating pressure is relatively small compared to conventional operations, it can only form elastic changes in the...

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Abstract

The invention provides a high efficiency coal bed methane extraction method which has a function of regulating and controlling desorption and diffusion function and is low in cost. Well head equipment, a remote control system and a system control algorithm are combined to implement the method; N wells form a network, and a whole methane extraction area is monitored and managed; modern technologies such as an infrasonic wave technology, a matrix control technology and a big data technology are used to regulate and control area coal bed desorption and diffusion to achieve an optimal effect. Gas extraction can be performed at a frequency lower than that of audible sound wave (including infrasonic wave) by controlling the well head equipment, a certain periodical fluctuate pressure is applied on the coal bed constantly during methane production, a micro structure of the coal bed generates periodical elastic shrinking relaxation deformation under the pressure, the frequency and a unit whole drive scheme are changed, unit desorption and diffusion features are searched and extracted, optimal periodical data can be found by tracking the features, and stratum energy is activated by adoption of the optimal periodical data, and in this way, coal bed methane can be rapidly extracted in low cost.

Description

Technical field [0001] The invention belongs to the technical field of underground energy mining, and particularly relates to an efficient mining method for coalbed methane. Background technique [0002] CBM is a clean and environmentally friendly energy source with abundant reserves. However, from the development of the United States and China, the reserves that are relatively easy to mine account for only about 10%, and 90% of CBM is difficult to mine. To develop natural gas as a resource, it is necessary to solve the technical problems of mining difficult-to-mine coalbed methane. [0003] Existing drainage and depressurization gas production processes complete the process of desorption→diffusion→seepage→gas production in series. The output of a single well (the amount of coalbed methane that moves from inside the coal seam to the wellbore every day) depends on The slowest of the first 3 steps. [0004] For difficult-to-mine CBM wells, after the initial drainage period, water pro...

Claims

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Application Information

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IPC IPC(8): E21B43/25
Inventor 陈久会
Owner 北京昊科航科技有限责任公司
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