Method and system for determining and penetrating underground coal gasification passage

A coal gasification and determination method technology, which is applied in coal gasification, underground mining, construction, etc., can solve the problems of low penetration efficiency of gasification channels, inability to penetrate gasification channels, and low penetration efficiency, so as to improve penetration efficiency and reduce The effect of small drilling investment and cost saving

Active Publication Date: 2009-05-06
ENN SCI & TECH DEV
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Problems solved by technology

With this method, at least three wells need to be drilled to roughly determine the gasification channel, and the cost is relatively high; in addition, the penetration efficiency of the gasification channel determined by this method is low, and there are often gas

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  • Method and system for determining and penetrating underground coal gasification passage
  • Method and system for determining and penetrating underground coal gasification passage
  • Method and system for determining and penetrating underground coal gasification passage

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Embodiment Construction

[0038] The inventor of the present invention considers that there are often fissures in the coal seam, and the naturally formed fissures can provide effective penetration channels. Therefore, the embodiment of the present invention uses the cracks in the coal seam to select and penetrate the coal gasification channel. Specifically, the development direction of the cracks in the coal seam (ie, the direction of the cracks) can be determined according to the measured in-situ stress in the horizontal direction of the coal seam, and the direction of the coal gasification channel can be determined according to the development direction of the coal seam cracks. In this way, the development of coal gasification channels along the development direction of coal seams can make the gasification channels reach the same permeability, and the required external force is small, thereby improving the penetration efficiency of the gasification channels; or applying the same external force, you can I...

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Abstract

The invention relates to the field of underground coal gasification, in particular to a technology for ensuring and channeling a coal gasification tunnel. The invention provides a method and a system for ensuring and channeling the coal gasification tunnel, wherein the method comprises the following steps: measuring the crustal stress in the horizontal direction of a coal bed; ensuring the cranny developing direction of the coal bed according to the measured crustal stress in the horizontal direction; and ensuring the direction of the coal gasification tunnel according to the cranny developing direction of the coal bed. Because the cranny developing direction in the coal bed is ensured according to the crustal stress in the horizontal direction of the coal bed and the direction of the coal gasification tunnel is decided according to the cranny developing direction of the coal bed, when the coal gasification tunnel exploited along the cranny developing direction of the coal bed reaches the same permeability, the required external force is smaller so that the channeling efficiency of the gasification tunnel is improved.

Description

Technical field [0001] The invention relates to the field of underground coal gasification, in particular to a technology for determining and penetrating coal gasification channels. Background technique [0002] The clean and efficient use of coal is one of the major issues in the field of energy and environmental protection in the world today. At present, the domestic coal that can be dug down by workers only accounts for 11.43% of the coal resource reserves. For other coal resources, such as abandoned mines or uneconomical lignite or deep coal seams, they are not suitable for dispatching personnel to go down and excavate. It uses the method of underground coal gasification to mine and utilize coal resources. [0003] The underground coal gasification process requires coal seams to have high gas permeability. However, the natural permeability of coal seams is very poor, so it is necessary to pierce the gasification channel in the coal seam before proceeding with underground coal...

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Application Information

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IPC IPC(8): E21B43/295
Inventor 陈峰李俊高鹍刘洪涛
Owner ENN SCI & TECH DEV
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