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Deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method

A drilling equipment and low-permeability technology, which is applied in drilling equipment and methods, drilling equipment, gas discharge, etc., can solve the problems of poor coal seam anti-permeability effect, process repeatability, and low gas discharge efficiency, etc. The structure is reasonable, the construction is flexible and convenient, and the effect of simplifying the construction process

Active Publication Date: 2020-05-01
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problems of the above-mentioned technology are: (1) the coal seam anti-permeability effect of a single drill hole is poor, and the efficiency of gas discharge is very low; complex
However, these processes all require pre-construction drillers, plugging drilling and hydraulic fracturing after withdrawing from the original drill pipe, and then performing gas drainage. The process is repetitive

Method used

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  • Deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method
  • Deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method
  • Deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method

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Experimental program
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Effect test

Embodiment 1

[0028] A drilling-cut-seal-pressure drilling equipment for deep low-permeability and high-gas coal seams, including water tanks, high-pressure water pipes, high-pressure pumps, overflow valves, drill bits, drill pipes, sealing capsules and control valves, and high-pressure pumps through the water pipes and water tanks After the high-pressure pump is pressurized, the high-pressure water pipe sends the water to the hydraulic pressure classification control system, the drill bit is set at the end of the drill pipe, and the sealing capsule is set on the drill pipe. The equipment has a drilling control system, a high-pressure hydraulic system, a hydraulic classification control system and a fracturing plugging control system. The drilling control system is set at the front end of the equipment. The size of the pressure controls the construction drilling, slotting, sealing and fracturing respectively. The fracturing plugging control system is set on the drill pipe, and the coal body ...

Embodiment 2

[0043] This embodiment is based on the first embodiment, and illustrates the beneficial effect of the device and method through practical application.

[0044] Among them, in the north mining area of ​​a certain mine, the drilling water injection anti-permeability field construction technology of the east wing of the +500 horizontal 43# coal seam and the upper stratified gas-containing coal seam and the actual situation of coal seam water injection in multiple mines optimized the selection of the hydraulic pressure classification control system to adjust the drilling The water pressure for scouring drill cuttings is less than 5MPa, the water pressure for cutting joints perpendicular to the length of the drill pipe is 25-35MPa, the water pressure for sealing holes in the sealing capsule is 35-40MPa, and the pressure relief water for hydraulic fracturing of coal seams The pressure is 40-50MPa. The rationality and effectiveness of the parameter selection are verified by applying ...

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Abstract

The invention provides deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method, and relates to the technical field of coal mine gas extraction and dustfall. The equipment comprises a drilling control system, a high-pressure hydrodynamic system, a water pressure grading control system and a fracturing plugging control system, wherein the drilling control system adjusts the drilling direction of a hole-drilling drilling rod and the water supply pressure of the drilling rod, high-pressure hydrodynamic system provides high-pressure water with different pressure for the equipment, and the water pressure grading control system ensures that the drilling and drilling cutting washing water pressure is smaller than 5 MPa, the water pressure for a cutting seam in the direction perpendicular to the length of the drilling rod is 25-35 MPa, the sealing water pressure of a sealing capsule is 35-40 MPa, and the water pressure of further pressure reliefand anti-reflection of a coal seam is 40-50 MPa; and the fracturing plugging control system finishes hole sealing and hydraulic fracturing construction control. According to the method for constructing drilling holes, slitting in the holes, hole sealing and the hydraulic fracturing by utilizing the equipment, the integrated construction of the single equipment is realized, and the construction efficiency of gas drainage hole drilling and coal seam dust prevention is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage and coal seam dust reduction, in particular to a drilling-cut-sealing-pressure drilling equipment for deep low-permeability and high-gas coal seams, and using the equipment to realize drilling, slotting, sealing, and pressure drilling. The method of crack construction. Background technique [0002] At present, coal mining has shifted from shallow mining to deep mining. With the increase of mining depth, the ground stress of the coal seam also increases, resulting in extremely low permeability of the coal seam. Similarly, the gas pressure of the coal seam further increases, and the possibility of gas disasters occurs also increased. However, gas is also a clean and efficient energy source. Effective gas drainage in low-permeability coal seams to reduce the possibility of disasters and improve the utilization rate of gas is an inevitable problem in the scientific mining of deep coal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B7/02E21B7/04E21B15/04E21B21/00E21B33/127
CPCE21F7/00E21B43/26E21B7/02E21B7/04E21B15/04E21B21/00E21B33/127E21B7/18E21B43/114E21C35/22E21B7/046E21B43/261
Inventor 王刚刘志远程卫民秦相杰范酒源孙路路刘震倪冠华于岩斌刘义鑫黄启铭
Owner SHANDONG UNIV OF SCI & TECH
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