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Extraction method for mining formed composite goaf coalbed methane through lower caving method

A technology for old empty areas and coalbed methane, which is applied in the field of coalbed methane extraction in composite old empty areas, and can solve problems such as waste of resources

Active Publication Date: 2016-10-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned problems, the present invention proposes a compound old empty area formed by mining the upper part by the knife column method and the lower part by the caving method, and the upper and lower parts are formed by the caving method from the perspective of maximizing the exploitation of coalbed methane resources while considering the economic cost. Combined with the method of simultaneous extraction of coalbed methane in old empty areas, it solves the phenomenon of a large amount of waste of resources caused by the abandonment of existing coalbed methane resources

Method used

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  • Extraction method for mining formed composite goaf coalbed methane through lower caving method

Examples

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Embodiment 1

[0026] Example 1: The method of extracting the coalbed methane in the composite old goaf formed by the caving method of the upper part of the cutter column and the lower part

[0027] This embodiment takes a certain working face of Yuecheng Mine of Shanxi Coal Group as an example, see figure 1 Shown, illustrate the extraction method of this invention. Yuecheng Mine is located in Qinshui Coalfield, which is one of the important coalfields rich in coalbed methane resources in my country. The recoverable coal seams in the coalfield are No. 3 coal seam of Shanxi Formation and No. 9 and No. 15 coal seams of Taiyuan Formation. Due to history and outdated mining methods, the recovery rate of No. 3 coal in the main coal seam in the coalfield is low, a large amount of coal is left underground, and the old goaf area is quite rich in coalbed methane resources. The No. 9 coal in the thin coal seam with an average distance of 47.16 meters from the floor of Coal No. 3 has an average coal t...

Embodiment 2

[0040] Example 2: The method of extracting coalbed methane in the composite old goaf formed by caving mining in both the upper part and the lower part

[0041] Taking a certain working face of Jinsheng Coal Mine of Shanxi Coal Group as an example below, the inventive method is illustrated. Jinsheng Coal Mine is located in Qinshui Coalfield, which is one of the important coalfields rich in coalbed methane resources in my country. The mineable coal seams within the scope of the coalfield are the No. 3 coal seam of the Shanxi Formation and the No. 9 and No. 15 coal seams of the Taiyuan Formation. Due to history and outdated mining methods, the recovery rate of No. 3 coal in the main coal seam in the coalfield is low, a large amount of coal is left underground, and the old goaf area is quite rich in coalbed methane resources. The No. 9 coal in the thin coal seam with an average distance of 53.20 meters from the floor of Coal No. 3 has an average coal thickness of 0.81 meters. The...

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Abstract

The invention discloses an extraction method for mining formed composite old mined-out area coalbed methane through a lower caving method. The method includes the steps that coalbed methane extraction is conducted by constructing a horizontal well at the position 1-5 meters above a lower goaf fissure zone; when the extraction amount of the coalbed methane is dropped to 10-20% of Q, segmented crushing is conducted, extraction is conducted on the goaf coalbed methane again, and when the extraction amount of the coalbed methane is dropped to 10-20% of Q again, supercritical carbon dioxide is injected to drive and replace the coalbed methane; extraction is conducted again till the extraction amount is dropped to 6 m<3> / min, and extraction is stopped. By means of the method, the problems that when a ground vertical drilling well is separately used to conduct extraction on a goaf originally, the effective contact area between the extraction drilling well and a goaf reservoir is small, and the extraction range is limited are solved; while the coalbed methane of the goaf on the lower layer is extracted, the coalbed methane resource close to the upper portion of the goaf is also extracted, and cost is saved; meanwhile, the horizontal well is located in the rock stratum, and therefore shaft collapse and blocking of the drilling well in a coal seam are avoided.

Description

technical field [0001] The invention relates to a method for extracting coalbed methane in a composite old goaf formed by lower caving mining, and belongs to the technical field of extracting coalbed methane. Background technique [0002] Due to long-term industrialized mining, there are countless old empty areas with huge areas in our country. Taking Shanxi Province as an example, by the end of 2013, there were more than 4,700 abandoned mines in Shanxi Province, and the area of ​​old empty areas had reached 5,000 square kilometers. Most of these old empty areas were excavated by old-style blasting with low recovery rate. Coal mining technology, the coal recovery rate is generally 50%~60%, or even lower, so the above-mentioned old empty areas have considerable coalbed methane resources and gas reserves. Relevant data show that only Shanxi Province is an example of old empty areas Coalbed methane resources are about 3 billion cubic meters. Gas is a kind of clean energy, and...

Claims

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Application Information

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IPC IPC(8): E21B43/00
CPCE21B43/006
Inventor 冯国瑞李振姜海纳白锦文张钰亭高强闫永敢张玉江康立勋
Owner TAIYUAN UNIV OF TECH
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