A hydraulic fracturing pressure relief method and device

Abstract

The invention relates to the technical field of coal mine roadway equipment, in particular to a hydraulic fracturing pressure relief method and device. The method includes a pressure relief process, and the pressure relief process includes the following steps: S1. Release the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section set in the target hole to an uninflated state, so that the pressure in the fracturing section All accumulated water flows out along the target hole; S2. Release the pressure on the elastic membrane on the packer at the upper end of the fracturing section set in the target hole to an unpressurized state, so that the remaining accumulated water above the fracturing section flows along the target hole. All flow out; S3, just remove the water injection pipe connected to the packer. The pressure relief process of this method is divided into two pressure reliefs, which can ensure that the pressure relief work of the upper elastic membrane and the lower elastic membrane can be completed independently, even if the accumulated water in the target hole is in a high pressure state during the pressure relief process of the lower elastic membrane, The stable state is maintained by the setting of the upper elastic membrane, which solves the problem of the rapid release of the water injection pipe caused by the pressure release of the packer in the traditional hydraulic fracturing pressure release.

Description

technical field [0001] The invention relates to the technical field of coal mine roadway equipment, in particular to a hydraulic fracturing pressure relief method and device. Background technique [0002] Coal mine roadway hydraulic fracturing technology has become an important means for coal mines to solve the initial mining and discharge of the working face and the pressure relief of the dynamic pressure roadway. When the existing hydraulic fracturing technology is in operation, it usually first takes a section of borehole with exposed bedrock, seals the upper and lower ends with a packer, then injects liquid and pressurizes until the hole wall ruptures. [0003] In the hydraulic fracturing technology of coal mine roadway, straddle expandable borehole packer is usually used, which is beneficial to realize multi-stage fracturing in the same borehole. The upper and lower elastic membranes of the straddle expandable drilling packer are controlled in series by the same expans...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a hydraulic fracturing pressure relief method and device, which is used to solve the problem that the water injection iron pipe always runs at an extremely fast speed during the pressure relief process after the staged fracturing in the existing hydraulic fracturing method. jump out, causing a very dangerous problem

Images