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Unit circulation type pressure injection and extraction integrated gas extraction system and method

A gas drainage and circulation technology, which is applied in the direction of gas discharge, mining fluid, mining equipment, etc., can solve the problems of difficult service coal seams, gas drainage concentration reduction, and economic value decline, so as to ensure the uniformity of the drainage effect, Improve the extraction concentration and promote the extraction effect

Pending Publication Date: 2020-08-07
UNIV OF SCI & TECH BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the limitation of the capacity of downhole pressure air and pressurization devices, the gas source of the downhole pressure and pumping integration project is relatively limited, and the continuous pressure injection consumes a lot of gas source, making it difficult for this technology to serve large areas of coal seams;
[0006] (2) The gas injected continuously for a long time will eventually flow to the extraction borehole through the injection borehole, so that the gas extraction concentration will continue to decrease, and gas is a valuable clean energy. When the gas concentration is lower than 5% Its economic value will drop sharply;
[0007] (3) The constant arrangement of injection holes and extraction holes often makes the gas content of the coal around the injection holes very low, while the gas content of the coal around the extraction holes remains at a high level. Uneven effect

Method used

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  • Unit circulation type pressure injection and extraction integrated gas extraction system and method
  • Unit circulation type pressure injection and extraction integrated gas extraction system and method
  • Unit circulation type pressure injection and extraction integrated gas extraction system and method

Examples

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Embodiment 1

[0061] combine Figure 1 to Figure 7 As shown, the present embodiment provides a unit circulation pressure-extraction integrated gas drainage system, including: a gas booster device 8, a high-pressure gas storage control device 9, a pressure-extraction manifold 11 and several pressure-extraction manifolds distributed in the coal seam 1 pumping unit 3;

[0062] Each pumping unit 3 comprises: a first pumping subunit 4 and a second pumping subunit 5, the boreholes of the first pumping subunit 4 and the boreholes of the second pumping subunit 5 alternate layout.

[0063] Each pumping unit 3 is correspondingly equipped with two pumping manifolds 11, one of which is connected to the drilling holes of all the first pumping subunits 4 of the pumping unit 3, and the other manifold is 11 is connected to the boreholes of all the second pumping sub-units 5 of the corresponding pumping unit 3 . The pressure-extraction manifold 11 is respectively connected with the extraction main pipeli...

Embodiment 2

[0068] On the basis of the above-mentioned first embodiment, this embodiment also provides a unit circulation pressure-extraction integrated gas drainage method, including:

[0069] S1. Divide the coal seam into N pumping units 3 . The number of units N is calculated by the following formula:

[0070]

[0071] In the formula, M is the total number of drilling holes in a mining face, q max is the rated standard output flow rate of the booster device, q is the required flow rate per unit length (1m) of boreholes for effective pumping, and is measured by the laboratory, L is the average length of a single drainage borehole, and 1.2 is the redundancy factor.

[0072] S2. Calculate the up-to-standard extraction volume Q of each extraction unit according to the original gas content of the coal seam, the up-to-standard gas content in drainage and the condition parameters of the coal seam N达标 . The up-to-standard extraction volume Q of each pumping unit 3 N达标 Calculated by:

...

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Abstract

The invention provides a unit circulation type pressure injection and extraction integrated gas extraction system and method. The system comprises a gas supercharging device, a high-pressure gas storage regulation and control device, a pressure injection and extraction collecting pipe and a plurality of pressure injection and extraction units distributed on a coal seam, each pressure injection andextraction unit comprises a first pressure injection and extraction subunit and a second pressure injection and extraction subunit, each pressure injection and extraction unit is correspondingly provided with two pressure injection and extraction confluence pipes, and the pressure injection and extraction confluence pipes are correspondingly connected with an extraction main pipeline and the high-pressure gas storage regulation and control device; the high-pressure gas storage regulation and control device is connected with the gas supercharging device; and the gas supercharging device is connected with an underground compressed air pipeline. By means of the hysteresis effect that the gas extraction efficiency is improved through pressure injection of air, circulation type pressure injection-extraction is carried out on different pressure injection and extraction units of the coal seam, so that the gas extraction efficiency is improved, meanwhile, the high-pressure gas use efficiencyand the gas extraction concentration are improved, and the gas extraction effect is more uniform.

Description

technical field [0001] The invention relates to the related technical field of enhanced gas drainage in coal mines, in particular to a system and method for gas drainage integrated with unit circulation pressure and extraction, which is mainly applicable to coal mines that need to improve the efficiency of gas drainage. Background technique [0002] Drainage boreholes can go deep into the coal seam, and under the action of extraction negative pressure, the gas pressure in the borehole can be kept at a relatively low state, forming a certain pressure gradient difference with the surrounding coal mass of the borehole, which promotes the cracks between blocks The free gas in the fracture flows to the drainage borehole, while the adsorbed gas desorbs to supplement the free gas in the fracture. Because the relationship between coal seam gas pressure and coal seam gas content follows the typical Langmuir type, the coal seam gas content in the low pressure stage is still high, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/16
CPCE21F7/00E21B43/168E21B43/006
Inventor 王公达程志恒何学秋杨鑫邱黎明高涵
Owner UNIV OF SCI & TECH BEIJING
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