Coal bed methane mining method combined with cluster wells and horizontal wells under complex terrain conditions

A complex terrain, cluster well technology, applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult construction, high cost, low output, etc., achieve good economy and increase coal seam The scope of surface gas exploitation and the effect of saving CBM surface development projects and equipment investment

Inactive Publication Date: 2017-08-25
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the problems of high cost, low output, and difficult construction of coalbed methane surface development by using cluster wells alone under complex terrain conditions, the present invention provides a method of combining cluster wells and horizontal wells for surface mining of coalbed methane method

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  • Coal bed methane mining method combined with cluster wells and horizontal wells under complex terrain conditions

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the combined ground mining method of coalbed methane by cluster wells and horizontal wells under complex terrain conditions of the present invention comprises the following steps:

[0022] (a) Set up a cluster well site (1) meeting the ground construction conditions at the position where the depth of the target coal seam (3) is 600m to 800m, construct a cluster well and cement the well; in this step, the cluster well consists of a vertical well and Composed of four to five directional wells, both vertical wells and directional wells adopt a double-opening shaft structure. The maximum well deviation of directional wells is less than 45° and the build-up rate is less than 5° / 30m. The plane distance between vertical wells and directional wells is controlled at 250m~ 300m, in order to reduce the difficulty of cluster well construction and...

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Abstract

The invention discloses a method for mining coalbed methane by combining cluster wells and horizontal wells on the ground under complex terrain conditions. The method comprises the following steps: (a) constructing cluster wells and cementing them; (b) constructing horizontal wells and cementing them; (c) Carry out perforation and fracturing construction in sequence in the coal seam section of cluster wells, and install pressure gauges at the wellhead; (d) Carry out staged perforation and fracturing construction in sequence in horizontal wells, and monitor cluster type during the fracturing process Wellhead pressure gauge changes; (e) cluster wells and horizontal wells slowly discharge overflow until the wellhead casing pressure is zero; (f) cluster wells are equipped with drainage and production equipment for drainage and gas production, and horizontal wells are only installed with gas production wellheads. The invention adopts the method of mining coalbed methane on the ground in combination with cluster wells and horizontal wells, which can realize the overall depressurization of coal reservoirs within the control range of cluster wells and horizontal wells, and significantly increase the surface mining of coalbed methane in areas where the buried depth of the target coal seam varies greatly. scope, saving CBM surface development engineering and equipment investment.

Description

technical field [0001] The invention relates to the technical field of surface mining of coalbed methane, in particular to a method for surface mining of coalbed methane combined with cluster wells and horizontal wells in areas with complex topographical conditions and large coal seam dip angles. Background technique [0002] my country is rich in coalbed methane resources, and the geological resources of shallow coalbed methane with a buried depth of 2000m are predicted to reach 36.8×10 12 m 3 , equivalent to conventional natural gas resources. Large-scale development of coalbed methane can alleviate the shortage of conventional oil and gas energy in my country, reduce the probability of coal mine gas accidents, reduce greenhouse gas emissions in coal mine production, and produce significant economic, environmental, safety and social benefits. [0003] Southwest my country, represented by eastern Yunnan and western Guizhou, is rich in coalbed methane resources and has gre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/30
CPCE21B43/006E21B43/305
Inventor 周效志桑树勋金军侯丁根黄华州敖显书侯登才
Owner CHINA UNIV OF MINING & TECH
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