Method for exploiting coal bed gas by hydraulic drilling and pressure relieving

A coalbed methane and hydraulic technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of limited hole diameter, unsafety and environmental pollution, and achieve the effect of convenient construction and cost saving

Inactive Publication Date: 2010-07-14
ZHENGZHOU UNIV +2
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  • Description
  • Claims
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Problems solved by technology

[0004] The hole diameter of the above technologies is limited, and there are factors of unsafety and environmental pollution to varying de

Method used

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  • Method for exploiting coal bed gas by hydraulic drilling and pressure relieving
  • Method for exploiting coal bed gas by hydraulic drilling and pressure relieving

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with an embodiment (accompanying drawing):

[0022] As shown in the figure, the method for exploiting coalbed methane by hydraulic digging and pressure relief of the present invention includes the following steps:

[0023] (1) Set the coalbed methane production well 1. Use a large-diameter drilling rig, pass through the roof of the coal seam and enter a little bit of the coal seam 9, and set up a coalbed methane exploitation well 1 capable of water injection, drainage, and gas output; Use known methods to securely connect.

[0024] (2) mechanical hole digging. After the coalbed methane extraction well is completed, the coal seam 9 is excavated using existing mechanical excavation tools, and the cave is as large as possible.

[0025] (3) Lower the flushing robot 6. The cave is completed, and the explosion-proof submersible flushing robot 6 is lowered from the side of the coalbed methane mining well ...

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Abstract

The invention discloses a method for exploiting coal bed gas by hydraulic drilling and pressure relieving. The method comprises the following steps of: drilling a large-caliber well to the coal bed(9), building a coal bed gas exploitation well(1) capable of adding water, discharging water and discharging gas, making a sleeve pipe(2) arranged on the drilling well, and performing mechanical drilling at the bottom of the well; making a well-sealing device arranged on an opening of the coal bed gas exploitation well(1), and making a ground water pump(3), a coal-water separating device(4) and a gas storage device(5) arranged; distributing water-discharging devices(8) and flushing robots(6) on both sides in the coal bed gas exploitation well(1), wherein the flushing robots(6) are connected with the ground water pump(3) by soft water pipes and can continuously flush the coal down in caves at the bottom of the well to form a pressure relieving space(7); discharging the coal-water mixture to the coal-water separating device(4) by the water-discharging devices(8); and discharging the coal bed gas continuously generated by the coal bed(9) after pressure relieving to the gas storage device(5) by the coal bed gas exploitation well(1). The method has the advantages of easily solving the problem of early exploiting the coal bed gas in the coal mass with looseness, extremely low permeability and high bursting, eliminating bursting risk and lowering a gas content of the coal mass.

Description

technical field [0001] The invention relates to the technical field of coal-bed methane exploitation, in particular to a method for mining coal-bed methane by hydraulic digging and pressure relief in soft, low-permeability and high outburst coal reservoirs. Background technique [0002] Coal seams in Yinggong and Dengfeng areas of Henan Province have complex structures, soft coal, and ductile deformation, which is mainly caused by interlayer sliding and is the product of strong plastic deformation. Intense tectonic damage makes the coal body scale-like or soil-like, with extremely poor permeability (both below 0.001mD), and because of its general characteristics of softness, low permeability, high gas and good storage conditions, coal and Gas outbreak area. For coalbed methane in such soft, low permeability, high gas, and high outburst coal reservoirs, there is no effective method of early surface mining. The well-known methods of vertical well fracturing and cluster wells ...

Claims

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Application Information

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IPC IPC(8): E21B43/17E21B33/03E21B43/34
Inventor 冯立杰姜光杰王金凤蒋猛曹晓丽姜锡慧刘振锋杨武洲郭一格范永杰孙明闯张文勇邓珺
Owner ZHENGZHOU UNIV
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