Hydraulic fracturing pressure relieving method and device

Abstract

The invention relates to the technical field of coal mine roadway equipment, in particular to a hydraulic fracturing pressure relieving method and a hydraulic fracturing pressure relieving device. Themethod comprises a pressure relieving process. The pressure reliving process comprises the following steps: S1, relieving the pressure of a lower elastic film of a packer at the lower end of a fracturing section which is set in a target hole in an uncharged state so that all accumulated water in the fracturing section flow out along the target hole; S2, relieving the pressure of an upper elasticfilm of the packer at the upper end of the fracturing section which is set in the target hole in the uncharged state so that all accumulated water remaining above the fracturing section flow out alongthe target hole; and S3, moving a water injection pipe which is connected to the packer out. According to the method, a pressure relieving process is divided into two steps, so that the pressure relieving work of the upper elastic film and the lower elastic film can be completed independently, even if the accumulated water in the target hole is in a high pressure state during in a pressure relieving process of the lower elastic film, the target hole can also be kept in a stable state by means of the packer of the upper elastic film; and therefore, the problem that the water injection pipe escapes quickly because of relieving the pressure of the packer at one time when conventional hydraulic fracturing pressure relieving is performed is solved.

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

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