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Anti-collapsing drilling method for grout spraying of soft coal seam

A soft coal seam, shotcrete technology, applied in the field of soft coal seam shotcrete anti-slump drilling, can solve problems such as limited anti-slump effect, achieve high drilling efficiency and gas drainage efficiency, improve drilling efficiency, and reduce pre-drainage. effect of time

Active Publication Date: 2015-07-01
河南理工大学科技园有限责任公司
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AI Technical Summary

Problems solved by technology

Drilling fluid anti-slump holes are mainly used for vertical drilling on the ground, and have limited anti-slump effects for horizontal wells and downhole horizontal drilling

Method used

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  • Anti-collapsing drilling method for grout spraying of soft coal seam

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Embodiment Construction

[0045] The anti-collapse drilling method of the soft coal seam by spraying grouting of the present invention comprises the following steps:

[0046] (1) Processing and testing the anti-collapse drilling device for spraying grouting in soft coal seams.

[0047] Such as figure 1 As shown, 1 is the outer drill pipe, 2 is the water inlet channel, 3 is the drill pipe joint, 4 is the support piece, 5 is the inner drill pipe, 6 is the slurry channel, 7 is the pulse jet nozzle, 8 is the slurry nozzle, 9 is a slag discharge water hole, 10 is a drill bit front section drill, 11 is a slurry inlet pipe, 12 is a water inlet pipe, and 13 is a rotary sealing joint.

[0048] During the drilling process, the drill pipe is respectively connected to the slurry inlet pipe 11 and the water inlet pipe 12 through the rotary sealing joint 13, and the slurry inlet pipe 11 and the water inlet pipe 12 are respectively connected to the slurry pump and the pulse jet pump.

[0049] The spraying anti-col...

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Abstract

An anti-collapsing drilling method for grout spraying of a soft coal seam includes the following steps that first, an anti-collapsing drilling device for grout spraying of the soft coal seam is machined and tested; second, technological parameters of the anti-collapsing drilling device for grout spraying are designed; third, hole reinforcing grout is prepared, and the solidification property of the grout is tested; fourth, the anti-collapsing drilling device for grout spraying of the soft coal seam is installed; fifth, anti-collapsing drilling for grout spraying is performed; sixth, drilling stops till the designed depth is achieved, clean water is used for cleaning a grout spraying pipeline and a spray nozzle, and a drill stem and a drill bit are withdrawn. Due to the adoption of the method, the efficiency for drilling bedding holes in the soft coal seam is substantially improved, the hole forming rate for drilling holes in 100 meters is substantially increased, and time for drilling the bedding holes in the soft coal seam is shortened; the gas drainage efficiency of the bedding holes in the soft coal seam is substantially improved, and time for gas pre-drainage of the soft coal seam is greatly shortened; the probability that gas exceeds the limit is greatly reduced in the tunneling and stoping period, and valuable time and a safety guarantee are provided for safe and efficient stoping and tunneling of a coal mine.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a drilling method for anti-collapse drilling in soft coal seams. Background technique [0002] On October 16, 2011, the State Administration of Work Safety, the National Development and Reform Commission, the National Energy Administration, and the State Coal Mine Safety Supervision Bureau issued the "Provisional Provisions on Coal Mine Gas Drainage Standards" with Ann Jian Zongmei [2011] No. 163 Mine with one of the following situations must conduct gas drainage and achieve drainage standards: (1) Mining dangerous coal seams with coal and gas outbursts; (2) The absolute gas emission of a coal mining face is greater than 5m / min or The absolute gas emission of a tunneling face is greater than 3m / min; (3) the absolute gas emission of a mine is greater than or equal to 40m / min; (4) the absolute gas emission of the mine is 1.0-1.5Mt per year (5) The a...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B33/13E21B21/00
CPCE21B7/00E21B21/00E21B33/13
Inventor 李定启
Owner 河南理工大学科技园有限责任公司
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