A gas extraction method

A technology of gas drainage and casing, which is applied in the direction of gas discharge, drilling equipment and methods, mining fluids, etc., can solve the problems of heavy drilling workload and achieve the effect of solving blind areas of drainage

Inactive Publication Date: 2016-08-03
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For drilling holes with a diameter of 100mm, the hole spacing is generally 2-3m, so the workload of drilling is very large

Method used

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Embodiment Construction

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0025] Please refer to Figure 2 to Figure 4 , the gas extraction method in the present invention, particularly, provides a kind of gas extraction method that can be used in soft coal seam deep hole and large aperture, and this method comprises the following steps:

[0026] Step 1, please refer to figure 2 Utilize the drilling rig to form the borehole 1, first adopt the first sleeve pipe 2 in the drilling process of the drilling rig, and stop drilling when the depth of the borehole 1 reaches 15-25 meters from the design depth; wherein, the first sleeve pipe 2 Air holes 7 are arranged on the pipe wall; preferably, the drilling rig uses a reverse circulation down-the-hole hammer as the drilling system, and of course other methods can also be used fo...

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Abstract

The invention relates to a gas extraction method. The method comprises of step one, forming a drill hole through a drilling machine, using a first casing tube during drilling of the drilling machine, stopping drilling when the depth of the drill hole reaches a position that is 15 meters to 25 meters away from the distance design depth, and air holes are formed in the first casing tube wall; step two, replacing the first casing tube with a second casing tube with no air holes in the tube wall, and performing drilling continuously to the designed depth; step three, injecting a sealing material between the second casing tube and the drill hole wall, and sealing a grouting tube between the second casing tube and the hole wall through the sealing material; step four, injecting cement paste between the second tube and the hole wall through the grouting tube after the sealing material is coagulated; and step five, connecting the second tube with a gas extraction tube after the cement paste is coagulated and beginning gas extraction. According to the gas extraction method, the casing tube on the lower portion is changed to be the first casing tube with kerfs or holes, and collapse-free deep hole drilling can be formed, accordingly, the problem of pumping dead zones in gas extraction of soft coal seams is solved.

Description

technical field [0001] The invention relates to the geological field, in particular to a gas extraction method. Background technique [0002] The "soft and broken" characteristics of structural coal rocks make it difficult to drill holes in coal seams. During the drilling process, complex situations such as collapse, block loss, leakage, water leakage, and necking often occur. Conventional drilling methods often cause accidents such as drill sticking, drilling, and drilling, and the drill pipe breaks and loses drills, resulting in The drilling depth cannot reach the designed depth, and there is a "blind area" of drainage, please refer to figure 1 . figure 1 Among them, 1 indicates the cut hole in the coal mining face, 2 indicates the blind area of ​​extraction, 3 indicates the extraction borehole of the coal seam, 4 indicates the shallow hole extraction borehole, and 5 indicates the recovery roadway. [0003] In addition, after drilling, the quality of the borehole cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/00E21B7/20E21B33/13
Inventor 石祥超孟英峰康毅力李皋
Owner SOUTHWEST PETROLEUM UNIV
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