High pressure resistant drilled hole sealing method

A high-pressure-resistant technology to be drilled, used in sealing/isolation, earth-moving, wellbore/well components, etc., and can solve problems such as changes in coal gas permeability, loose coal, and poor hole sealing. Achieving the effect of wide practicability, easy operation and simple method

Active Publication Date: 2011-08-03
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cement mortar, hole sealer, foam polyurethane and other materials are widely used in China to seal boreholes. However, during the implementation process, there are often phenomena that the borehole seal is not tight, or the strength of the sealant material is not str...

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Embodiment Construction

[0014] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0015] In the high-pressure-resistant borehole sealing method of the present invention, first, insert the first grouting pipe 1-1 into the drilled hole 4 that has been constructed in the coal seam with a construction depth of more than 40m and an aperture diameter of φ113mm; Borehole 4 is injected at a depth of 27-29m into I grouting thickness L 3 I high-pressure-resistant sealing material 2-1 of 1~2m, and high-strength sealing material 2-1 is an expansive cement jelly material with a compressive strength greater than 30MPa. Ⅰ Grouting thickness L 3 After injection, close the ball valve 6-1; insert the second grouting pipe 1-2 with a depth of 1-2m and the third grouting pipe 1-3 with a depth of 5-6m into the borehole 4, respectively. The grouting pipe 5 at the top and with a depth of 2-3m, all the grouting pipe front-end pipe walls are provided with 0....

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Abstract

The invention relates to a high pressure resistant drilled hole sealing method. The method comprises the following steps of: inserting a first grouting pipe into a constructed drilled hole; pouring a high pressure resistant sealing material I with a grouting thickness L3 into a position which is 27 to 29m away from the top of the drilled hole by using the first grouting pipe, and after pouring, closing a ball valve; inserting a second grouting pipe with the depth of 1 to 2m, a third grouting pipe with the depth of 5 to 6m, and a return pipe which is positioned at the top of the drilled hole and has the depth of 2 to 3m into the dilled hole respectively; pouring a high pressure resistant sealing material II with a grouting thickness of L1 into the hole mouth of the drilled hole by using the second grouting pipe and sealing the hole, and after pouring, closing the ball valve; and after the high pressure resistant sealing materials at the front and rear sections in the drilled hole are solidificated, pouring compound polyurethane into an interlayer formed by blocking of the two sections of high-intensity sealing materials by using the third grouting pipe until the interlayer with the thickness L2 is filled, and closing a third ball valve and a fourth ball valve. The method is simple, and easy to operate, and has a good effect.

Description

technical field [0001] The invention relates to a high-pressure-resistant drilling sealing method, which is especially suitable for high-pressure sealing of drilling and blasting holes in coal mines, drilling high-pressure hydraulic fracturing sealing, blasting drilling, pressure measuring drilling, gas drainage drilling, coal seam drilling, etc. Water injection drilling and sealing of boreholes such as tunneling, underground and underwater pouring systems. technical background [0002] The geological conditions of my country's coal mines are complex, high-gas coal seams account for 50%-70%, and high-gas low-permeability coal seams account for about 70% of them. In order to improve the air permeability of low-permeability coal seams, technologies such as underground coal seam high-pressure hydraulic fracturing and deep hole loosening blasting are often used to relieve pressure and increase permeability of coal bodies. These technologies require drilling in coal seams, inject...

Claims

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Application Information

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IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 翟成林柏泉张萌博李全贵
Owner CHINA UNIV OF MINING & TECH
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