Coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method

A hydrodynamic and horizontal wellbore technology, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., can solve the problems of high risk, high difficulty and high cost, and achieve the goal of improving permeability and conductivity and improving effect. Effect

Pending Publication Date: 2021-01-26
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a coal seam horizontal well hydrodynamic jet reaming hole coal digging and bag support roadway pressure relief method, which can overcome the defects of the prior art and better solve the problem of strip driving and unloading of coal roadways in coal mine working faces. Problems such as great difficulty, long cycle, high cost, and high risk exist in decompression and elimination

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  • Coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method
  • Coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method
  • Coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method

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Embodiment Construction

[0036] The above-mentioned technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0037] see Figure 1 to Figure 10 , shows the coal seam horizontal well hydrodynamic jet reaming coal digging and bag support forming roadway pressure relief method of the present invention.

[0038] The coal seam horizontal well hydrodynamic jet reaming hole coal removal and bag support forming roadway pressure relief method may include the following steps:

[0039] Step 1: Construct an L-shaped horizontal well in the coal seam 1, and lower the front end of the horizontal wellbore into a casing 4 made of non-metallic (such as: glass fiber reinforced plastics) for hole protection (see figure 2 ).

[0040] Preferably, the well location of the L-shaped horizontal well fully considers fact...

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Abstract

The invention discloses a coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method. The method comprises the following steps: hydrodynamic high-pressure jet reaming coal digging is conducted on a ground horizontal well to form a large-diameter drill hole, and part of energy in a coal seam is released through deformation and damage ofthe large-diameter drill hole to achieve an effective pressure relief effect, meanwhile the permeability and flow guiding capacity of coal mass around a shaft are also improved, compared with an existing pressure relief and outburst elimination mode that a large number of pressure relief drilled holes are constructed in a coal seam in an underground coal mine, the construction method is more efficient, economical and safer, setting and segmented supporting are achieved through a bag device, reamed pulverized coal is prevented from entering a reamed section at the front end, the pulverized coal can return to the ground advantageously, and therefore the coal-digging, pressure-relief and outburst-elimination effect is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a coal seam horizontal well hydrodynamic jet reaming and digging coal and bag support forming roadway pressure relief method. Background technique [0002] Aiming at the problem of pressure relief and outburst elimination in coal roadway strip excavation in coal mine working face, the method of pressure relief and outburst elimination drilling through layer drilling in bottom pumping roadway is generally adopted in coal mines. This method not only requires a large amount of drilling engineering, but also requires the construction of a special bottom pumping roadway to arrange the drilling site. It faces a series of problems such as difficulty in pressure relief and outburst elimination, high investment, long cycle time, and high construction risk. [0003] For this reason, in view of the above-mentioned defects, the designers of the present invention have researched and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/18E21B7/28E21B33/12E21F17/00
CPCE21B7/046E21B7/18E21B7/28E21B33/1208E21F17/00
Inventor 张旭峰张群范耀许耀波李浩哲徐建军王成姚团琪
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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