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A Coal Seam Permeability Enhancement Method Combining Microwave Assisted Extraction and Hydraulic Fracturing

A hydraulic fracturing and microwave-assisted technology, which is applied in the fields of earth-moving drilling, gas discharge, and production of fluids, can solve the problems of difficult penetration of organic solvents into popularization and application, and achieves improved gas drainage effect, increased porosity, and is widely practical. sexual effect

Active Publication Date: 2017-10-24
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology cannot be popularized and applied in coal mines because organic solvents are difficult to penetrate into the coal body

Method used

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  • A Coal Seam Permeability Enhancement Method Combining Microwave Assisted Extraction and Hydraulic Fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, as figure 1 As shown, the method of coal seam permeability enhancement combined with microwave-assisted extraction and hydraulic fracturing: firstly, a hydraulic fracturing borehole 2 is constructed in the coal seam 1, and the hydraulic fracturing borehole 2 is sent into the fracturing borehole 2 after the construction is completed. Pipe 3, microwave protection pipe 7 and gas drainage pipe 4 until the innermost ends of fracturing pipe 3 and gas drainage pipe 4 reach the roof of coal seam 1, and the innermost end of microwave protection pipe 7 reaches the middle of coal seam 1. At the position 0.1m away from the orifice, the microwave protective tube 7 is made of polytetrafluoroethylene. Then, connect the outer end of the microwave antenna 5 to the coaxial waveguide 6 and send the microwave antenna 5 and the coaxial waveguide 6 into the microwave protection tube 7 until the microwave antenna 5 reaches the innermost end of the microwave protection tube 7; T...

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Abstract

The invention provides a microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method and belongs to the technical field related to coal mine down-hole hydraulic fracturing. The method includes the steps that a microwave antenna is connected to the innermost end of a coaxial waveguide tube and sent into a fracturing drill hole, the outer most end of the coaxial waveguide tube is connected with a waveguide tube converter, the waveguide tube converter is connected with a rectangular waveguide tube, and the rectangular waveguide tube is connected with a microwave generator; organic solvent and high pressure water are mixed, hydrofracture is conducted on the drill hole through a fracturing tube, meanwhile, the microwave generator is turned on, radiation drilling is conducted through the microwave antenna, fracturing is conducted, a seepage is provided for the solvent, the organic solvent dissolves small organic molecules in coal so that a chambering effect is generated, and methane desorption is promoted through the heat effect of microwaves. According to the method, hydrofracture, solvent extraction and microwave radiation are combined, the porosity and permeability of the coal seam are greatly improved, methane desorption is promoted, and thus the methane extraction effect is greatly improved.

Description

technical field [0001] The invention relates to a coal seam anti-permeability method in which microwave-assisted extraction and hydraulic fracturing are coordinated, belongs to the technical field of underground hydraulic fracturing in coal mines, and is especially suitable for soft and high-gas coal seams. Background technique [0002] About 70% of the high gas outburst coal seams in my country's coal mines have the characteristics of microporosity, low permeability and high adsorption, which leads to the difficulty of gas drainage in most coal seams and serious gas disasters. Hydraulic fracturing is one of the effective technical measures to improve the effect of coal seam gas drainage, but the existing hydraulic fracturing technology has unstable effects and insufficient pressure relief. Microwave-assisted organic solvent extraction can dissolve organic small molecular compounds in coal, dredge the pores and fissures of coal, and greatly improve the porosity and permeabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/24E21B43/22E21B33/13E21F7/00
CPCE21B33/13E21B43/006E21B43/16E21B43/2405E21B43/26E21F7/00
Inventor 林柏泉李贺洪溢都刘统王瑞杨威黄展博
Owner CHINA UNIV OF MINING & TECH
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