Drilling and sealing method and sealing device for ultra-high pressure fracturing holes in underground coal mines

A sealing device and fracturing hole technology, which are applied in the directions of sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve the problems of blocking the water outlet hole of the fracturing pipe, unable to fracturing, and affecting the fracturing effect. , to achieve the effect of increasing perfusion pressure, high blocking success rate and reliable performance

Active Publication Date: 2011-12-21
重庆市能源投资集团科技有限责任公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling depth of the plugging hole in this way can reach 15m~50m, the diameter can be controlled at about 100mm, and the diameter of the fracturing hole can be controlled at about 80mm. However, the main problem of this plugging method is that when the grouting pressure increases When it reaches a certain level, the cement slurry will flow into

Method used

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  • Drilling and sealing method and sealing device for ultra-high pressure fracturing holes in underground coal mines
  • Drilling and sealing method and sealing device for ultra-high pressure fracturing holes in underground coal mines
  • Drilling and sealing method and sealing device for ultra-high pressure fracturing holes in underground coal mines

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Embodiment 1

[0032] Example 1 see figure 1 A drilling and sealing method for ultra-high pressure fracturing holes in underground coal mines, comprising the following steps:

[0033] a Drill a plugging hole 1 with a depth of 15m~50m on the coal rock mass;

[0034] b Continue to drill a fracturing hole 2 whose diameter is smaller than the plugged hole 1 in the plugged hole 1;

[0035] c Send the underground ultra-high pressure fracturing sealing device into the plugging hole 1, so that the grouting pipe 8, the grout return pipe 10 and the nozzle of the fracturing pipe provided with the underground ultra-high pressure fracturing sealing device in the coal mine are exposed to the sealing hole. Plugging hole 1 orifice outside; grouting pipe 8 is provided with the bottom end of grouting hole 81 to be apart from plugging hole 1 orifice proper distance, and the bottom end of grouting hole 10a that return grouting pipe 10 is provided with is 1 hole away from plugging hole The water outlet hole 4a...

Embodiment 2

[0043] Example 2 see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , a kind of hole sealing device for the drilling and sealing method of the ultra-high pressure fracturing hole in the coal mine underground for the ultra-high pressure fracturing hole in the coal mine of embodiment 1, comprising the grouting pipe 8 and the return The grout pipe 10, the fracturing pipe extending from the plugging hole 1 to the fracturing hole 2, the grouting pipe 8, the grout returning pipe 10 and the fracturing pipe are connected into one body, the grouting pipe 8, the grout returning pipe 10 and the fracturing pipe One end of the plugging hole 1 orifice is exposed, and a stop valve 3 is provided at the end of the grouting pipe 8 and the grouting pipe 10 that exposes the plugging hole 1 orifice. The front end of the grouting pipe 8 is provided with a plurality of grouting holes 81, The bottom end of the slurry return pipe 10 is provided with a plurality of slurry return holes 10a,...

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Abstract

The invention discloses a drilling-sealing method and a sealing device of a coal mine underground ultrahigh pressure fracturing hole. The drilling-sealing method comprises the following steps: drilling a plugging hole on coal rock body; going on drilling a fracturing hole forward in the plugging hole; transmitting the sealing device into the plugging hole, enabling a water outlet hole of a fracturing pipe to stretch into the fracturing hole and enabling a taper sleeve sleeved on the fracturing pipe and made of soft material to plug on a hole opening of the fracturing hole; sealing by using polyurethane and solidifying for 30 minutes for 1 m length section at the hole opening of the plugging hole; and grouting cement slurry greater than 425 into the plugging hole with pressure by a grouting pipe, and solidifying for 48 hours after finishing grouting. The device comprises a grouting pipe and a slurry returning pipe and a fracturing pipe. The grouting pipe and the slurry returning pipe are arranged in the plugging hole. The grouting pipe, the slurry returning pipe and the fracturing pipe are connected integrally. A soft taper sleeve is arranged on the fracturing pipe. The soft taper sleeve is plugged at the hole opening of the fracturing hole. The invention has the advantages that the sealing method has high sealing success rate, good effect and wide application range; and the sealing device has simple structure and convenient operation.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage, in particular to a drilling and sealing method for ultra-high pressure fracturing holes in underground coal mines and a hole sealing device used in the hole sealing method. Background technique [0002] Coal seam gas is a kind of clean energy, but it is also a source of disaster for coal mine production. How to achieve the pre-extraction of gas before coal mining, to achieve the dual purpose of resource development and utilization and coal mine disaster reduction, has always been the focus of attention. Especially with the increase of mining depth, the increasingly strong demand for resources, and the introduction of a series of national compulsory measures on coal mine gas disaster management and the introduction of incentive policies for the development and utilization of coalbed methane, there is an urgent need to have a set of systematic, complete, ground-to-underground Combin...

Claims

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Application Information

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IPC IPC(8): E21B33/13
Inventor 余模华沈大富郭臣业周东平廖金华王联王文春
Owner 重庆市能源投资集团科技有限责任公司
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