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A system and method for electric detonation fracturing combined with microwave thermal drive gas drainage

A technology of gas drainage and microwave synergy, which is applied in the direction of gas discharge, mining equipment, mining fluid, etc., can solve the problems of insignificant thermal cracking effect, unsatisfactory gas engineering application effect, and low heat injection efficiency

Active Publication Date: 2021-05-04
NORTH CHINA INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many scholars have proposed the use of microwave radiation to inject heat into coal seams. Microwave heat injection can promote gas desorption in coal seams and generate micropores in coal seams. And other problems, so that the engineering application effect of microwave heat injection gas drainage is not ideal

Method used

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  • A system and method for electric detonation fracturing combined with microwave thermal drive gas drainage
  • A system and method for electric detonation fracturing combined with microwave thermal drive gas drainage

Examples

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Effect test

Embodiment 1

[0041] An electric detonation fracturing cooperative microwave thermal drive gas drainage system is characterized in that it includes a drilling rig 5, an ultra-high pressure water jet generation system, an electric detonation fracturing system, a microwave heat injection system and a gas drainage system.

[0042] The gas extraction system includes an orifice sealer, an air slag separator 17 and a gas extraction pipeline 20 . The orifice sealer is a tubular body. The front end of the orifice sealer is open, and is fixed on the hole wall of the gas extraction hole 3 orifice, and the rear end is connected with the gas slag separator 17 . The gas slag separator 17 is connected to a gas extraction pipeline 20 . A gas concentration detector 18 and a gas extraction pipeline valve 19 are installed on the pipeline between the gas slag separator 17 and the gas extraction pipeline 20 .

[0043] The ultra-high pressure water jet generation system includes an ultra-high pressure water p...

Embodiment 2

[0047] This embodiment discloses a method for using the electric detonation fracturing cooperative microwave thermal drive gas drainage system described in Embodiment 1, including the following steps:

[0048] 1) Construct the gas drainage hole 3 from the side of the road to the coal seam 1. When the gas extraction hole 3 is drilled into the predetermined distance in the coal seam roof 2, stop drilling. Into the nanofluid storage tank 12, the ZnO nanofluid suspension is perfused. Insert the head end of the insulating sleeve 13 into the gas extraction hole 3 . In this embodiment, the good electrical and thermal conductivity of ZnO nanofluid is used to improve the electrical and thermal conductivity of coal, and through the synergistic effect of electric detonation fracturing technology and microwave heating coal injection, efficient fracturing of coal seams and high efficiency of gas are promoted. The realization of desorption effectively improves the effect of gas cracking d...

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Abstract

The invention provides an electric detonation fracturing cooperative microwave thermal drive gas drainage system and method. The system includes ultra-high pressure water jet generation system, electric detonation fracturing system, microwave heat injection system and gas drainage system. When working, the drilling rig clamps the tail end of the insulating sleeve. The head end of the insulating sleeve extends into the gas drainage hole. The input end of the rotary sealing device of the drilling rig is connected with the ultra-high pressure water pump through the nanofluid pipeline, and the output end is connected with the tail end of the insulating casing. The use method of the system includes the steps of constructing gas drainage holes, injecting nano fluid suspension, discharging and heating. The system combines electric fracturing with microwave heat injection, realizes the synergistic effect of coal seam fracturing and thermal driving of gas, significantly improves the gas desorption efficiency, achieves the purpose of preventing and controlling gas disasters, and realizes efficient and safe mining of coal resources .

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage, in particular to an electric detonation fracturing cooperative microwave thermal drive gas drainage system and method. Background technique [0002] The deep coal seams in my country generally have the characteristics of low coal seam permeability and high concentration of adsorbed gas, which seriously restricts the safe and efficient mining of coal resources in our country. [0003] Using various measures to crack the coal seam to increase the air permeability of the coal seam has become one of the fundamental methods to control the gas problem. Scholars at home and abroad have explored measures such as electric detonation and electric pulse to crack coal bodies through simulation experiments and field practice. However, the low conductivity of coal seams makes the engineering effects of electric detonation, electric pulse and other fracturing methods unsatisfactory, and it is di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/26E21B33/12
CPCE21B33/12E21B43/26E21F7/00
Inventor 程志恒邹全乐张天诚刘涵刘彦麟闫发志李家祺周俊豪贾雪祺
Owner NORTH CHINA INST OF SCI & TECH
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