Method for forming easy-to-collapse drilled hole

A hole-collapse and hole-sealing technology, applied in drilling equipment and methods, drilling equipment, earth-moving drilling, etc., can solve the problems of large workload, hole-collapse, and high cost, and achieves easy operation, wide practicability, simple method effect

Active Publication Date: 2011-10-26
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

[0027] 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

[0028] 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

The invention discloses a method for forming an easy-to-collapse drilled hole, and the method comprises the following steps: constructing a large-diameter main curing hole in a coal seam, and further placing a polyurethane grouting pipe, a cement grouting pipe and a slurry return pipe into the large-diameter main curing hole; and injecting a polyurethane layer with the thickness of 1-2m into the orifice of the large-diameter main curing hole via the polyurethane grouting pipe, further injecting cement slurry into the large-diameter main curing hole through the cement grouting pipe, curing thecement, and then implementing drilling operation in the axial center direction of the large-diameter main curing hole, thus completing the formation operation of one easy-to-collapse drilled hole; orfirstly constructing the large-diameter main curing hole, and constructing a plurality of small-diameter auxiliary curing holes which are distributed uniformly on the periphery of the large-diameter main curing hole; performing hole sealing and grouting on the large-diameter main curing hole and the small-diameter curing holes; and curing the cement slurry in the large-diameter main curing hole and the small-diameter curing holes, and then implementing the drilling operation in the axial center direction of the large-diameter main curing hole, thus completing the formation operation of one easy-to-collapse drilled hole. By adopting the method, the easy-to-collapse hole can be formed when the coal seam is drilled, the hole-forming probability is high, the operation is simple, convenient and practicable, and the cost is low.

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 Applications(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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