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A method for heat injection and enhanced drainage of U-shaped coalbed methane wells

A coalbed methane, U-shaped technology, which is applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of ineffective coalbed methane extraction and low extraction rate, and achieves improved extraction rate, The effect of speeding up the extraction

Active Publication Date: 2017-11-07
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a coalbed methane U-shaped well heat injection enhanced extraction method, to solve the technical problems that the existing coalbed methane extraction method has a low extraction rate and cannot effectively extract coalbed methane

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  • A method for heat injection and enhanced drainage of U-shaped coalbed methane wells
  • A method for heat injection and enhanced drainage of U-shaped coalbed methane wells

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Embodiment Construction

[0023] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description with reference to the accompanying drawings. It should be understood that the present invention can have various changes in different embodiments without departing from the protection scope of the present invention, and the descriptions and illustrations therein are essentially for illustration rather than for limit the invention.

[0024] Such as figure 2 As shown, a U-shaped coalbed methane well heat injection enhanced drainage method, the steps are as follows:

[0025] ① According to the construction requirements and sequence of coalbed methane U-shaped wells, the vertical well 1 and the horizontal well 2 of the U-shaped well are constructed, and the horizontal section of the horizontal well 2 is located in the coal seam 3, and the vertical well 1 and the horizontal well 2 are connected;

[0026] ② At least three U-shaped well...

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Abstract

The invention relates to a coalbed methane U-shaped well heat injection enhanced extraction method, relates to an underground coalbed methane extraction method, and solves the technical problem that the existing coalbed methane extraction method has a low extraction rate and cannot effectively extract the coalbed methane. The steps of the present invention are: construct vertical wells to the coal seam, construct horizontal wells, and form U-shaped wells; at least three U-shaped wells are constructed, one cemented well is used as a heat injection well, and the rest are used as gas production wells; the horizontal wells are arranged in parallel, and in the In the coal seam; inject hot water at 150°C to 300°C from the heat injection well to the coal seam to heat the coal seam; repeat the injection of hot water until the coal seam is heated above 100°C to 250°C; extract coalbed methane and groundwater from the production well . The invention is used for the exploitation of underground coal bed gas, and has the advantages of being able to effectively extract the coal bed gas, speed up the extraction speed of the coal bed gas, and improve the extraction rate.

Description

technical field [0001] The invention relates to an underground coal-bed gas mining method, in particular to a method for extracting coal-bed gas by using a coal-bed gas U-shaped well. Background technique [0002] Such as figure 1 As shown, the coalbed methane U-shaped well is a connected well composed of a vertical well 1 and a horizontal well 2 . First construct vertical well 1 to coal seam 3, and then construct horizontal well 2. The horizontal well 2 includes a vertical well 2.1 and a deflected horizontal well 2.2. When the vertical well 2.1 is drilled from the ground to the deflection point A of the deflected horizontal well 2.2 (starting point of artificial deflection) A, it begins to bend with a certain curvature to the deflected horizontal well 2.2. The landing point of the deviated horizontal well 2.2 (the point where the inclination angle reaches 90° in the borehole trajectory) B, and then continue the directional horizontal drilling to make the deviated horizont...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/30
Inventor 冯增朝赵静赵东吕兆兴赵阳升
Owner TAIYUAN UNIV OF TECH
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