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Modular and cascade development method for underground in-situ conversion of oil-rich coal

A modular, oil-rich coal technology, applied in coal gasification, underground mining, mining fluids, etc., can solve the problems of reducing the comprehensive utilization of oil-rich coal resources, insufficient utilization of coal seams, and easy collapse of cavities, so as to improve resource utilization efficiency, improving resource utilization efficiency, and reducing construction difficulty

Active Publication Date: 2022-08-09
陕西省煤田地质集团有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a modularization and cascade development method for underground in-situ transformation of oil-rich coal, through the modularization and cascade development method to solve the problem of insufficient utilization of coal seams in the prior art and the cavity after coal seam gasification The problem of easy collapse reduces the development difficulty of comprehensive utilization of oil-rich coal resources

Method used

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  • Modular and cascade development method for underground in-situ conversion of oil-rich coal
  • Modular and cascade development method for underground in-situ conversion of oil-rich coal
  • Modular and cascade development method for underground in-situ conversion of oil-rich coal

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Embodiment 1

[0037] The present embodiment provides a modularized and stepped development method for underground in-situ conversion of oil-rich coal, the method comprising the following steps:

[0038] Step one, as figure 1 As shown, the oil-rich coal development zone is divided into multiple oil-rich coal blocks;

[0039] Step two, as figure 2 As shown, an injection well 1 and a production well 2 are drilled in each oil-rich coal block, and the injection well 1 and the production well 2 are drilled below the coal seam floor 6. Specifically, the above-mentioned injection well 1 and production well 2 Drilling to 5 meters below the coal seam floor 6, the injection well 1 and the production well 2 are cemented in the whole well section, and temperature sensors are provided on the outside of the casing of the injection well 1 and the production well 2, and the temperature sensors are respectively located on the upper part of the coal seam roof 4 2 meters, the middle of the coal seam 5 and t...

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Abstract

The invention provides a modular and cascade development method for underground in-situ conversion of oil-rich coal, which comprises the following steps: dividing a selected oil-rich coal seam into a plurality of blocks, and carrying out cascade development on the oil-rich coal in each block; carrying out first-stage development on the coal seam by using microorganisms, and extracting coal tar and gas in the coal seam; carrying out second-stage development on the coal seam by heating fluid, and extracting coal tar in the coal seam for the second time; injecting a gasifying agent into the coal seam to carry out third-stage development on the coal seam, and converting residual fixed carbon in the coal seam into combustible gas; and finally, a gasification cavity formed after gasification of the coal bed around the radial well is filled. According to the method, the oil-rich coal development area is divided into the multiple oil-rich coal blocks, the construction difficulty of the whole oil-rich coal development project can be reduced, and the utilization efficiency of oil-rich coal resources is improved.

Description

technical field [0001] The invention belongs to the technical field of oil-rich coal mining, and in particular relates to a modularization and cascade development method for underground in-situ conversion of oil-rich coal. Background technique [0002] Oil-rich coal is a coal-based oil and gas resource and an important supplement to my country's oil and gas resources. Underground in-situ conversion technology is the main direction for realizing low-carbon and green development of coal resources. Compared with traditional coal resource development processes, it can reduce environmental damage, improve resource utilization, and reduce transportation and labor costs. The underground in-situ conversion technology of oil-rich coal mainly includes underground in-situ gasification and underground in-situ pyrolysis. Underground in-situ gasification is to ignite oil-rich coal in situ underground, carry out controlled combustion, convert oil-rich coal into gas, and extract it to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22E21B43/26E21B43/295
CPCE21B43/24E21B43/16E21B43/26E21B43/295
Inventor 王振东杨甫马丽付德亮段中会
Owner 陕西省煤田地质集团有限公司
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