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Method for repeated hole sealing on gas extraction drilling hole by rotary jet grouting and solidifying

A technology of gas drainage and hole sealing, which is applied in the direction of gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of short service life of drilling holes and low concentration of gas drainage, and achieves wide practicability, low cost, Wide range of effects

Active Publication Date: 2015-11-11
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

[0003] Technical problem: To invent a method that is easy to operate, high in sealing efficiency, and capable of multiple sealing in view of the current mine gas drainage concentration is low and the service life of drilling is not long.

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  • Method for repeated hole sealing on gas extraction drilling hole by rotary jet grouting and solidifying

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Embodiment Construction

[0016] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] The drilling and sealing method for mine gas drainage of the present invention adopts instruments such as drill bits, drill pipes, drilling rigs, extraction pipes, bladders, high-pressure rotary spraying equipment, liquid injectors, and uses rotary spraying solidified materials as sealing materials ,Specific steps are as follows:

[0018] Such as figure 1 As shown, first use a drill bit of Φ113mm to construct a drill hole 9 with a required depth on the coal body, drill the drill bit to the required depth, and then drill back, and use high-pressure rotary spraying equipment to evenly spray the solidified material on the wall surface of the drill hole 9, A dense sealing layer 8 is formed, the thickness of the sealing layer 8 is 0.1-0.5mm, and the sealing length is 12m; the pressure of the high-pressure rotary spraying equipment can reach 10-15Mpa. Th...

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Abstract

The invention relates to a method for repeated hole sealing on a gas extraction drilling hole by rotary jet grouting and solidifying. Rotary jet grouting and solidifying materials are uniformly sprayed on a drilling hole wall surface by high-pressure rotary jet grouting equipment and can permeate in cracks of coal masses well, after being solidified, the rotary jet grouting and solidifying materials can be tightly combined to the coal masses and have high strength, cracks surrounding a large drilling hole can be sealed, and the hole can be fixed. A gas extraction tube with a bag is plugged into the drilling hole, and the rotary jet grouting and solidifying materials are injected into the bag by a liquid injector. After the rotary jet grouting and solidifying materials are solidified, the gas extraction tube is used for extracting gas, and first-time hole sealing for the drilling hole is finished. If gas extraction concentration is reduced to 30%, the large drilling hole can be sealed and solidified by the high-pressure rotary jet grouting equipment again, and the hole sealing frequency is not limited so as to continuously extract high-concentration gas. The drilling hole can be repeatedly sealed by rotary jet grouting and solidifying, deformation of the drilling hole is avoided, gas extracting concentration is increased, and the service life of the drilling hole is prolonged.

Description

technical field [0001] The invention relates to a hole sealing method, in particular to a hole sealing method which is suitable for multiple times of hole sealing by rotary spraying and solidification in underground gas drainage boreholes of coal mines. Background technique [0002] At present, the hole sealing method mainly adopts cement mortar sealing, polyurethane sealing, hole sealing device sealing, high water material sealing, secondary sealing and so on. However, the mud pump equipment for cement mortar sealing is heavy, and the grouting flow is difficult to control; the cost of polyurethane sealing is high; the sealing device is only suitable for temporary sealing; the setting time of high-water materials is affected by the water-cement ratio. It is difficult to grasp the accurate water-cement ratio in downhole field operations; the concentration of gas drainage during the first sealing of the second hole sealing technology is low. In addition, when the concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138E21F7/00
Inventor 林柏泉宋吴兵郝志勇孙炜浩李博洋
Owner CHINA UNIV OF MINING & TECH
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