Method for achieving ground coal bed gas production through cluster well and horizontal well under complex terrain condition
A complex terrain, cluster well technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of high cost, low output, difficult construction, etc., to achieve good economy and increase coal seam The scope of gas surface mining, the effect of saving coalbed methane surface development projects and equipment investment
Inactive Publication Date: 2015-07-22
CHINA UNIV OF MINING & TECH
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[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 w
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[0019] The present invention will be further explained below in conjunction with the accompanying drawings.
[0020] 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:
[0021] (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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The invention discloses a method for achieving ground coal bed gas production through a cluster well and a horizontal well under a complex terrain condition. The method for achieving ground coal bed gas production through the cluster well and the horizontal well under the complex terrain condition comprises the following steps that a, the cluster well is constructed and is fixed; b, the horizontal well is constructed and fixed; c, gun perforation and fracturing construction are conducted on a target coal bed section of the cluster well in sequence, and a pressure meter is installed on the mouth of the cluster well; d, segmented gun perforation and fracturing construction are conducted on the horizontal well in sequence, and the change of the reading of the pressure meter on the mouth of the cluster well is monitored during fracturing; e, overflowing is slowly conducted on the cluster well and the horizontal well in sequence till the surface casing pressure is zero; f, water drainage and gas production are conducted after a drainage and production device is installed on the cluster well, and only a gas production well mouth is installed on the horizontal well. According to the method for achieving ground coal bed gas production through the cluster well and the horizontal well under the complex terrain condition, overall depressurization of a coal reservoir within the control range of the cluster well and the horizontal well can be achieved, the ground production range of coal bed gas in areas with burial depths of target coal beds changing greatly is remarkably widened, a ground coal bed gas production project is simplified, and equipment investment is reduced.
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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Login to view more 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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