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Method for forming easy-to-collapse drilled hole

A technology for hole collapse and hole sealing, applied in drilling equipment and methods, drilling equipment, earthwork drilling and production, etc., can solve the problems of heavy workload, hole collapse, high cost, etc., and achieve simple and easy operation, wide practicability, The effect of simple method

Active Publication Date: 2013-04-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are not only labor-intensive, time-consuming, heavy workload and high cost, but also prone to more serious hole collapse, and even lead to the abandonment of drilling

Method used

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  • Method for forming easy-to-collapse drilled hole
  • Method for forming easy-to-collapse drilled hole
  • Method for forming easy-to-collapse drilled hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one, as figure 1 , figure 2 In the drilling and forming method of easy-to-collapse holes, a large-diameter main curing hole 1 with a diameter of 113 mm and a depth of 70-90 m is pre-constructed in the coal seam 6, and then a radius of 200 m is constructed around the large-diameter main curing hole 1. 3~6 small-diameter auxiliary curing holes 2 evenly distributed ~250mm; the diameter of the small-diameter auxiliary curing holes 2 is 70mm and the depth is 70-90m, the drilling construction is the same as the existing technology, and the auger drill rod is selected according to the needs of the site , round drill pipe or triangular drill pipe; after the drilling construction is completed, first seal the large-diameter main curing hole 1, and put a polyurethane grouting pipe with a length of 3 to 5m into the large-diameter main curing hole 1 4-1. The cement grouting pipe 4-2 with a length of 11-13m and the grouting pipe 3 with a length of 3-5m; inject it into th...

Embodiment 2

[0029] Embodiment two, such as image 3 , Figure 4 In the drilling method for easy-to-collapse holes shown, a large-diameter main curing hole 1 with a diameter of 113mm and a depth of 70-90m is pre-constructed in the coal seam 6. The drilling construction is the same as the existing technology, and the auger drill can be selected according to the needs. rod, round drill rod or triangular drill rod. After the drilling construction is completed, the large-diameter main curing hole 1 is sealed, and a polyurethane grouting pipe 4-1 with a length of 3 to 5 m and cement with a length of 11 to 13 m are put into the large-diameter main curing hole 1. The grouting pipe 4-2 and the grouting pipe 3 with a length of 3-5m; the polyurethane layer 7 with a thickness of 1-2m is injected into the orifice of the large-diameter main curing hole 1 through the polyurethane grouting pipe 4-1. During the polyurethane process, the grouting pipe 3 should be kept close to the upper inner wall of the...

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Abstract

In the drilling and forming method for easily collapsed holes disclosed by the invention, a large-diameter main curing hole is constructed in the coal seam, and then polyurethane grouting pipes, cement grouting pipes and grouting pipes are put into the large-diameter main curing hole; The polyurethane grouting pipe injects a polyurethane layer with a thickness of 1~2m into the orifice of the large-diameter main curing hole, and then injects the cement slurry into the large-diameter main curing hole through the cement grouting pipe. After the cement is cured, the large-diameter main curing The drilling operation is carried out in the axial direction of the hole, and the forming operation of a hole that is easy to collapse is completed. Or construct a large-diameter main curing hole first, and construct multiple small-diameter auxiliary curing holes evenly distributed around the large-diameter main curing hole; seal and grout the large and small diameter curing holes; After curing, the drilling operation is carried out in the axial direction of the large-diameter main curing hole to complete the forming operation of a hole that is easy to collapse. The invention solves the technical problem of easily collapsing holes when drilling coal seams, and has high hole forming probability, simple and easy operation and low cost.

Description

technical field [0001] The invention relates to a method for forming easily collapsed holes, and is especially suitable for forming easily collapsed holes during drilling operations in soft coal seams. Background technique [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. Therefore, coal mines often need to carry out coal and gas outburst risk identification during the mining process, and take regional gas prevention and control measures such as coal seam hydraulic fracturing, hydraulic slotting, coal seam water injection, and advanced drilling. For the above work, the drilling operation in the coal seam must be carried out at first, but in the general coal seam, especially the soft coal seam, after the drilling is completed, the phenomenon of hole collapse is very easy to occur, which causes great difficulties for identification and mine ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E21B33/13
Inventor 翟成林柏泉倪冠华张萌博李全贵
Owner CHINA UNIV OF MINING & TECH
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