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Method and device for dredging pores and cracks of coal seam gas extraction drill hole

A technology for drilling and coal seam gas drainage, which is applied in the direction of wellbore/well valve devices, mining fluids, earthwork drilling, etc. It can solve the problems of affecting the drilling drainage volume and increasing the gas drainage volume, and achieves an increase Gas drainage volume and the effect of improving drainage efficiency

Active Publication Date: 2020-10-09
SHANDONG ANYI MINING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These passages are constantly changing. The long-term drainage of mine borehole gas below -13Kp (required by the coal industry standard), the pores and fissures in the process of gas migration have caused plugging, which seriously affects the drilling volume. Therefore, a new method is proposed. A method for dredging pores and fissures in coal seam gas drainage boreholes and increasing the amount of gas drainage

Method used

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  • Method and device for dredging pores and cracks of coal seam gas extraction drill hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a device for dredging coal seam gas drainage borehole pores and fissures includes a negative pressure pipe 1 and a positive pressure pipe 2 communicating with the borehole, and the negative pressure pipe 1 is connected to the drill hole through a first connecting pipe 3 hole, the first connecting pipe 3 is equipped with a metering unit 7 and a first valve 5, the metering unit 7 is used to detect gas flow and pressure, the positive pressure pipe 2 is connected to the drill through the second connecting pipe 4 A second valve 6 is installed on the second connecting pipe 4, and the boreholes communicate with each other.

[0034] Wherein, the first valve 5 and the second valve 6 are mine electric valves, the metering unit 7, the first valve 5 and the second valve 6 are connected to a substation, and the substation is connected to a monitoring host.

[0035] Wherein, the metering unit 7 adopts a combined sensor GD3.

[0036] A device for dredging ...

Embodiment 2

[0042] Such as figure 1 As shown, a method for dredging coal seam gas drainage borehole pores and fissures comprises the following steps:

[0043] Step S1, installation: connect the borehole to the negative pressure pipe 1 and the positive pressure pipe 2, install a metering unit 7 and a first valve 5 between the borehole and the negative pressure pipe 1, and install the metering unit 7 and the first valve 5 between the borehole and the positive pressure pipe 2. A second valve 6 is installed between the pressure pipes 2;

[0044] Step S2, initialization: closing the second valve 6, opening the metering unit 7 and the first valve 5;

[0045]Step S3, negative pressure dredging: when the metering unit 7 detects that the gas flow rate Q≤the first set value, the first valve 5 is closed, and the blockages in the pores and fissures of the coal seam gas drainage drilling are under positive pressure Dredging is carried out under the action of the metering unit 7 until the pressure P ...

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Abstract

The invention relates to the technical field of gas extraction, in particular to a method and device for dredging pores and cracks of coal seam gas extraction drill holes. The device comprises a negative pressure pipe and a positive pressure pipe which communicating with drill holes, the negative pressure pipe is connected with the drill holes through a first connecting pipe, a metering unit and afirst valve are installed on the first connecting pipe, the metering unit is used for detecting gas flow and pressure, the positive pressure pipe is connected with the drill holes through a second connecting pipe, a second valve is installed on the second connecting pipe, and the drill holes communicate with one another; the method comprises the following steps that S1, installation is conducted;S2, initialization is conducted; S3, negative pressure dredging is conducted; and S4, when dredging cannot be conducted by adopting the negative pressure dredging in the step S3 and the gas flow Q detected by the metering unit is smaller than or equal to a first set value, positive pressure dredging is adopted. Holes and crack channels in a coal gas migration process are dredged, the extraction efficiency of the drill holes is improved, and the gas extraction amount is increased.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a method and a device for dredging pores and fissures in coal seam gas drainage boreholes. Background technique [0002] Coal is a highly heterogeneous organic rock transformed from plant remains, with varying degrees of preservation of plant cell structure. The difference in the original cell structure of plants and the degree of completeness of preservation are different. During the long geological age, the colloidal substances in the early coal-forming period gradually dehydrated and condensed due to the action of high temperature and high pressure, forming countless tiny pores. According to the porosity in coal, it is classified as follows: [0003] 1. Micropores, whose diameter is less than 0.01 μm, constitute the adsorption volume in coal; [0004] 2. Small holes, with a diameter of 0.1-0.1 μm, which constitute the space for capillary condensation and gas diffusion; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/06E21B43/00E21B47/06E21B47/00
CPCE21B43/006E21B47/00E21B47/06E21B34/066Y02E10/10
Inventor 赵永生徐伟杰李庆源王晓军李研李寿山
Owner SHANDONG ANYI MINING EQUIP CO LTD
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