Underground drilling and fracturing-integrated staged fracturing device and gas drainage process

Abstract

The invention discloses an underground drilling and fracturing-integrated staged fracturing device. The device comprises a drill, a first packer, a first staged drill stem, an interception water distribution rod, a second packer, a second staged drill stem and a function conversion rod which are communicated from front to back sequentially, a first ball, a second ball, and a third ball; an underground drilling and fracturing-integrated staged fracturing gas drainage process is implemented on the basis of the technology of the underground drilling and fracturing-integrated staged fracturing device. Through the underground drilling and fracturing-integrated staged fracturing device and the underground drilling and fracturing-integrated staged fracturing gas drainage process, the integrationof drilling and fracturing is realized, the drill hole wall in a wider range can be opened and is extended and cracked, and fracturing can be can be performed more pertinently; and compared with a non- staged fracturing method, the process has the advantage that the air permeability coefficient of a coal bed is improved greatly.

Description

technical field [0001] The invention relates to a subsection fracturing device integrated with drilling pressure for downhole drilling and a process for gas drainage using the device. Background technique [0002] my country's coal mine gas disaster is serious, seriously restricting the safe production of coal enterprises. Gas drainage is the main technical means for gas control in my country at present, but due to the generally low air permeability coefficient of coal seams in my country, ideal drainage effects have not been achieved. At present, downhole drilling hydraulic fracturing, an effective coal seam anti-permeability technology, has been applied on a large scale. However, the current downhole drilling hydraulic fracturing only fracturing a single borehole, and high-pressure water can easily The weak section in the borehole opens and extends cracks, and the cracking of the entire hole section is not well achieved, thereby reducing the fracturing efficiency of a sin...

AI Technical Summary

Problems solved by technology

At present, downhole drilling hydraulic fracturing, an effective coal seam anti-permeability technology, has been applied on a large scale. However, the current downhole drilling hydraulic fracturing only fracturing a single borehole, and high-pressure water can easily The weak section in the borehole opens and extends cracks, and the cracking of the entire hole section is not well achieved, thereby reducing the fracturing efficiency of a single hole, increasing the cost of single-hole fracturing, and failing to generate a single hole More cracks and extensions have affected the further improvement of the coal seam permeability coefficient; in addition, the current hydraulic fracturing drilling and fracturing are separated. Then fracturing is carried out in the hole, and after the fracturing is completed, the packer is manually pulled out

Since the hole wall has undergone certain changes during the drilling, retracting and fracturing of the drill pipe, it will take a lot of manpower to reinsert or pull out the packer, and it is also difficult to reconnect the drilling rig to pull out the drill

Sometimes, the packer cannot even be pulled out, resulting in the fracturing borehole not being able to be pumped, and becoming a "waste hole" that consumes a lot of manpower and material resources

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