Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof

A technology for pressure-relieving coal seams and wellbore structures, applied in mining equipment, boreholes/well components, mining fluids, etc., can solve the problems of high hole breakage rate of surface wells and short service time of surface wells, and reduce the number of wells The effect of improving the probability of body damage, enhancing the stability of the well body structure, and reducing construction risks

Inactive Publication Date: 2011-07-13
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The key problem is that the hole breakage rate of surface w

Method used

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  • Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof
  • Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof
  • Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof

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Example Embodiment

[0018] Below in conjunction with accompanying drawing, one embodiment of the present invention is further described:

[0019] figure 1 As shown, the structure of the wellbore of the pressure relief CBM surface extraction well, the first aperture section 1 of the first vertical depth H1, the second aperture section 5 of the second vertical depth H2, the vertical The second borehole section 5 of the third vertical depth H3 of the borehole and the third borehole section 10 that penetrates deep into the protected layer 12, the first vertical depth H1 and the second vertical depth H2 of the wellbore deflection drilling The inclination angle is 15-25°, and the borehole curvature should be 5-10° / 100m. The aperture of the second apertured aperture section 5 is smaller than the aperture of the first apertured apertured section 1, and the third apertured apertured section 10 is smaller than the second apertured apertured section 5; The distance of the holes is 30 to 40 m. The first o...

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Abstract

The invention provides a well structure of a pressure-releasing coal bed gas ground extraction well and an arrangement method thereof, wherein the well structure includes a first aperture section, a second aperture section and a third aperture section, wherein the first aperture section is in a first vertical depth of a well deflecting drill, the second aperture section is in a second vertical depth of the well deflecting drill, the second aperture section is in a third vertical depth of a vertical drill, and the third aperture section penetrates deeply in a protected layer. The arrangement method comprises the following steps of: drilling outside an extraction region, directionally deflecting drilling the upper parts of the first aperture section and the second aperture section, adopting a straight well body for the lower part of the second aperture section and the third aperture section, and closing to a boundary final hole in the extraction region so that most of the well structure is arranged out of a mining influence range or the region with little mining influence, the stability of the ground extraction well is greatly increased, the construction danger is reduced, the extraction yielding of the coal bed gas well is improved, the damage to the ground well by movement of cover rocks is effectively reduced, and the service time of the ground extraction well is increased.

Description

technical field [0001] The invention relates to a well body structure, in particular to a well body structure suitable for pressure relief coal bed methane surface extraction wells in coal mine mining areas. Background technique [0002] The coalbed methane ground drainage wells for pressure relief in coal mine mining areas mostly adopt the technical mode of "ground vertical wells arranged on the centerline of the upper and lower airways in the mining area" or "ground vertical wells arranged in the mining area close to the upper return airway". For the pressure relief CBM surface wells designed in the early stage, the opening position and the final hole position are located on the central line of the mining area. The final hole is located at the bottom of the protective layer. On the top of the coal seam, a working screen is installed from below the gas transmission casing to the roof of the protective layer, and the cement slurry is sealed from the top of the protective sea...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/30E21B43/08E21B7/04E21B7/06E21F7/00
Inventor 桑树勋黄华州曹丽文周效志徐宏杰刘会虎
Owner CHINA UNIV OF MINING & TECH
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