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Method for determining coal bed fractures

A technology of cracks and coal seams, applied in the field of underground coal gasification, can solve the problems of unproven, economical and practicability that cannot meet the needs of the industry, high cost, etc., to reduce difficulty, high practicability and economy, and shorten time Effect

Active Publication Date: 2012-05-30
ENN SCI & TECH DEV
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Problems solved by technology

[0005] The disadvantage of the above-mentioned prior art is that the cost is relatively high, and it is only a theoretical derivation without field verification. Therefore, its economy and practicability have not been able to meet the needs of the industry.

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  • Method for determining coal bed fractures
  • Method for determining coal bed fractures
  • Method for determining coal bed fractures

Examples

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example 1

[0054] Such as figure 1 As shown, seven boreholes are included in this example 1. First, a central borehole ① is arranged in the center. Then, on a circular layout line with the central borehole ① as the center and a radius of 15 meters, 6 surrounding boreholes are arranged at intervals of 60° horizontal angle, so that 6 surrounding boreholes are arranged around the central borehole ①. Drill holes ②-⑦.

[0055] Then, input high-pressure compressed air (such as figure 1 Indicated by the arrow pointing to the central borehole ①) for high-pressure air fracturing. The high-pressure compressed air input into the central borehole ① will overcome the resistance of the underground coal seam, pass through the underground coal seam, and flow out of the surrounding boreholes ②-⑦ with different flow rates (such as figure 1The arrows from the central drilling ① to each surrounding drilling ②-⑦ are shown). Monitor and measure the gas flow and gas components discharged from the surround...

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Abstract

The invention discloses a method for guiding the layout of gasification furnaces for underground coal gasification and determining the directions of main fractures in underground coal beds. The method comprises the following steps: drilling a central hole above the reserving area of an underground coal bed; drilling a plurality of surrounding holes on a circular layout line centering on the central hole; inputting pressurized air from the central hole to the underground coal bed so as to carry out high-pressure air fracturing; monitoring and determining the flow and components of gas discharged from each surrounding hole; carrying out comparison on the determined flow of each discharged gas, determining the position of a first surrounding hole with the largest flow of discharged gas, and determining the position of a second surrounding hole with the second-largest flow of discharged gas; and according to a formula provided by the invention, carrying out calculation on the angles of the main fractures. The practical and economical method provided by the invention can be used for shortening the breakthrough time for underground coal-bed gasification, and reducing the breakthrough difficulty of underground coal-bed gasification.

Description

technical field [0001] The invention relates to a method for determining coal seam fissures, which is used in the field of underground coal gasification. Background technique [0002] Underground coal gasification is the process of directly burning underground coal in a controlled manner, through the thermal and chemical effects of coal to generate combustible gas, which has the advantages of good safety, low investment, high efficiency, and less pollution. The attention of countries all over the world is known as the second generation coal mining method. [0003] In the process of underground coal gasification, determining the direction of the existing main cracks in the coal seam itself plays a guiding role in the design of the furnace type and the layout of the furnace holes, and it directly affects the penetration speed and efficiency of the furnace holes. However, the current underground coal gasification does not have a complete set of technical methods for determinin...

Claims

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Application Information

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IPC IPC(8): E21B43/295E21B43/26
Inventor 贺岩陈峰宋玉平高明林郑林郭宏伟
Owner ENN SCI & TECH DEV
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