Coal bed gas well sand blasting perforation jet hole forming and fracturing integrated production increasing process method

Abstract

The invention discloses a coal bed gas well sand blasting perforation jet hole forming and fracturing integrated production increasing process method. The coal bed gas well sand blasting perforation jet hole forming and fracturing integrated production increasing process method comprises the following steps that an integrated pipe column is descended into a well needing to be transformed; sand blasting perforation is conducted on the well, and a coal bed is opened; hole forming transforming is conducted on the well; a cylinder or spherical body with hole cavities uniformly distributed along a shaft, the gun length being the height and the spray gun operating distance being the radius is formed; and fracturing construction is conducted on the well. If multi-layer multi-stage construction is conducted, ball throwing is conducted after fracturing of the first layer on the lower portion is completed, a packer is subjected to seat sealing, a sliding sleeve on the packer is opened in a pressure rise mode, sand blasting perforation, jet hole forming, fracturing and the like are conducted on the second section, and the rest can be done in the same manner till all construction layers are constructed. According to the coal bed gas well sand blasting perforation jet hole forming and fracturing integrated production increasing process method, perforation, hole forming and fracturing integrated production increasing construction can be completed in the coal bed gas well at the same time; the problems that near wellbore areas are polluted and the crack radiating area is small are effectively solved; the flow conductivity of coal reservoirs of the near wellbore areas is improved; the seepage area is increased; and the gas yield of the coal bed is increased.

Description

technical field [0001] The invention relates to the field of coalbed methane development, in particular to a coalbed methane well sandblasting, perforation, injection cavitation and fracturing integrated production stimulation process. Background technique [0002] At present, the production stimulation measures and completion methods of coalbed methane well development are divided into several methods such as dynamic cave completion, perforation and fracturing completion. The completion of dynamic caverns is to inject air or foam into the coal seam part of the open-hole section for multiple times to pressurize and release blowouts, resulting in severe well pressure excitement, causing the coal seam to collapse to form a large stable coal seam cave, and to form criss-cross fractures around the cave. ,Increase the production capacity of the high production layer of the coal seam. The initial effect of the stimulation method of dynamic cave completion is good, but during the d...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a coalbed methane well sandblasting, perforation, jet cavitation and fracturing integrated production stimulation process, the method can be completed in the coalbed methane well, and the perforation, cavitation and fracturing integration can be completed at the same time Production increase construction, effective measures to solve the problems of pollution near the wellbore and small radiation area of ​​fractures, improve or improve the conductivity of coal reservoirs near the wellbore, increase the seepage area, and increase the production of coalbed methane

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