Hydraulic fracturing crossing hole pitchup hole sealing method of broken surrounding rock

Abstract

The invention discloses a hydraulic fracturing crossing hole pitchup hole sealing method of a broken surrounding rock. A hole is drilled; a plastic casting is leaded into the drilled hole; a plastic air return pipe is leaded between the wall of the casing and the wall of the drilled hole; after cement slurry is injected into the casing, a concentric round hole is drilled in the step drilling place; the drilling length reaches a coal seam or top plate place; and the cement slurry is used for sealing by a three-section hole sealing process. The method overcomes the potential safety hazard caused by the leakage of fracturing fluid in no fracturing, and has the advantages of high hole sealing efficiency, good hole sealing effect, wide application range, wide pressure resistant range and recyclability.

Description

technical field

[0001] The invention belongs to the technical field of hydraulic fracturing hole sealing, and in particular relates to a method for sealing upward holes in hydraulic fracturing piercing layers of broken surrounding rock. Background technique

[0002] In recent years, underground hydraulic fracturing anti-permeability technology in coal mines has gradually become a conventional means of gas prevention and control. However, the quality of drilling and sealing directly determines the success or failure of hydraulic fracturing. The existing hydraulic fracturing drilling and sealing technology mainly has the following aspects: 1) In the development of special hydraulic fracturing sealers, such as bladder belt sealers, high-strength combined hole sealers, high-pressure hydraulic sealers, etc. Hole sealer, etc. 2) In terms of sealing materials, there are mainly modified expansion resins, expansion cement, expansion cement composite materials, high-strength cement, ...

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