A comprehensive extraction method for goaf and coal seam fracturing
A technology for goaf and coal seam, which is applied in the fields of mining fluids, earthwork drilling, wellbore/well components, etc., can solve the problem that coalbed methane cannot be synchronously drained, and improve the pressure drop funnel and increase the extraction efficiency. Effect
Active Publication Date: 2022-07-26
山西省煤炭地质勘查研究院有限公司
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[0003] In order to solve the technical problem that the coalbed methane in the mined-out area cannot be extracted synchronously with the coalbed methane in the coal seam in the current coalbed methane extraction, the invention provides a comprehensive extraction method for the goaf and coalbed methane well fracturing
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[0015] combine figure 1 Shown: A comprehensive extraction method for fracturing of goaf and coalbed methane well, including a 311mm wellbore, a surface casing of 244.5mm, a second wellbore of 215.9mm, a production casing of 139.7mm, coal seam, goaf, fracturing and fracturing Sand cracking; the first open wellbore is drilled by a 311mm drill bit to 20m below the bedrock; the surface casing 244.5mm is lowered into the first open 311mm wellbore, and the cementing cement returns to the ground; the second open 215.9mm wellbore is The 215.9mm drill bit is drilled to 20m below the coal seam, and the cementing cement returns to the ground; the fracturing fractures are filled with fracturing sand; the fracturing fractures are generated by hydraulic fracturing (after perforation, the ground fracturing equipment passes through the The holes are pressed open to form cracks), and the length of the cracks is about 150m; the said pressure cracks connect the wellbore and the goaf. There are ...
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The patent of the invention belongs to the technical field of coalbed methane exploration and development in goafs of abandoned mines, and specifically relates to a comprehensive extraction method for goafs and fracturing of coalbed methane wells. The technical problem that the coalbed methane in the goaf cannot be synchronously extracted with the coalbed methane in the coal seam in the current coalbed methane extraction is solved. A comprehensive extraction method for goaf and coal seam fracturing, comprising the following steps: (1) drilling from the ground to 20m below the bedrock, drilling an open wellbore, lowering a surface casing into the open wellbore, and returning cement to the height Ground; (2) Drill down from the bottom of the first open wellbore to 20m below the coal seam, drill the second open wellbore, run the production casing in the second open wellbore, and return the cement to the ground; (3) Use perforating projectiles to penetrate the production The casing is connected to the surrounding coal seam, so that the perforation cave is connected to the wellbore and the adjacent goaf, and the fracturing sand is pressed into the perforation cave to support the fracturing; (4) The top of the wellbore is connected to the extraction equipment for CBM extraction.
Description
technical field [0001] The patent of the invention belongs to the technical field of coalbed methane exploration and development in goafs of abandoned mines, and specifically relates to a comprehensive extraction method for goafs and fracturing of coalbed methane wells. Background technique [0002] With the increasing number of abandoned coal mines and the advancement and development of the coalbed methane industry, more and more companies have invested in the extraction of coalbed methane from abandoned mines. In the late stage of coalbed methane extraction in abandoned mines, the area of the goaf that interferes with the coal seam is limited, and the goaf is a natural depressurization space for the coalbed methane. In order to combine the development of coalbed methane wells with the development of coalbed methane in goaf areas, this method is designed to solve this problem, so that coalbed methane wells can achieve the effect of increasing production and increasing eff...
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IPC IPC(8): E21B43/00E21B43/267
CPCE21B43/006E21B43/267
Inventor 焦鹏帅屈晓荣苏育飞姜伟毕井龙牛丽娜王聪覃轩孙晓光曾玲刘锋谢秀娟宁舒红李慧林朱亚茹姜慧慧
Owner 山西省煤炭地质勘查研究院有限公司