A method for expanding the diameter of caverns in vertical fracturing wells for coalbed methane
A fracturing well and coalbed methane technology, which is applied in the field of mine gas treatment technology and coal and coalbed methane co-extraction, can solve the problems of low production of gas wells and difficulty in realizing commercial exploitation, and achieve the purpose of increasing permeability, increasing daily gas production, Effect of improving desorption efficiency
Active Publication Date: 2022-05-17
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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Problems solved by technology
[0002] Fractured, soft and low-permeability coal seams are widely distributed in my country, and surface coalbed methane wells only undergo reservoir reconstruction through hydraulic fracturing, and the production of gas wells is low, making it difficult to realize commercial exploitation
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[0027] The technical solution adopted in the present invention is: in view of the low output of CBM wells in broken, soft and low-permeability coal reservoirs, the secondary transformation of the reservoir is carried out on the basis of hydraulic fracturing, and the casing segment milling and cement sweeping are carried out on the perforation section. Then, the pressure of the coal seam is relieved by means of dynamic hole creation and diameter expansion, forming a composite fracture of diameter expansion and fracturing, increasing the permeability of the coal seam, and forming a composite production stimulation process of hydraulic fracturing and caverns. Specifically include the following steps:
[0028] 1) Drilling and completion engineering: In order to reduce the pollution to the coal seam, the drilling fluid should be degradable drilling fluid, or change to clean water when drilling above the roof of the coal seam, so as to reduce the pollution of the drilling fluid to th...
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The invention discloses a method for expanding the diameter of a coalbed methane vertical fracturing well cave, which belongs to the field of mine gas treatment technology and the technical field of coal and coalbed methane co-exploitation, and aims to improve the coalbed methane extraction effect of broken soft outburst coal seams. In view of the low production of CBM wells in broken, soft and low-permeability coal reservoirs, the secondary reconstruction of the reservoir is carried out on the basis of hydraulic fracturing. The coal seam is decompressed to form a composite stimulation process of hydraulic fracturing and caverns. Through the implementation of this plan, the production capacity of new coalbed methane wells can be increased, or the production capacity of low-yield wells can be improved twice to realize the commercial exploitation of coalbed methane.
Description
technical field [0001] The invention belongs to the field of mine gas treatment technology and the field of coal and coalbed methane co-mining technology, in particular to a coal mine surface coalbed methane vertical fracturing well dynamic cavitation increase production method, especially for cave diameter expansion and production increase in low production wells in broken soft low permeability coal seams method. Background technique [0002] Fractured, soft, and low-permeability coal seams are widely distributed in my country, and surface coalbed methane wells are only reconstructed through hydraulic fracturing. The production of gas wells is low, and it is difficult to achieve commercial exploitation. The typical soft and low permeability coal seams in my country have a permeability below 1mD. After hydraulic fracturing of coalbed methane vertical wells, the average gas production of gas wells is less than 200m 3 / d. Therefore, the extraction of coalbed methane from bro...
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IPC IPC(8): E21B43/26E21B43/267E21B29/06E21B21/00E21B7/28E21B43/16
CPCE21B43/006E21B43/26E21B43/267E21B29/06E21B21/00E21B7/28E21B43/168
Inventor 张江华李国富张遂安李兵张永成徐云张为李德慧刘亮亮王越
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD