Hydraulic fracturing hole protecting method and hole protecting device

Abstract

The invention relates to the technical field of coal mines, in particular to a hydraulic fracturing hole protecting method and device. The hydraulic fracturing hole protecting method comprises the steps that S1, the hole protecting device is moved to a preset position; s2, a high-pressure water pipe is opened, high-pressure water is injected, and a high-pressure hydraulic guide head moves to the hole collapse section; s3, the high-pressure air pipe is opened, the expansion body is tightly attached to the hole wall, and therefore hole sealing operation is carried out; s4, a grouting pump is started, and a hole protection material is conveyed to the hole collapse section through a grouting pipe; and S5, after the hole protecting material is solidified, the expansion body is subjected to hole sealing, fracturing and unloading. The defect that the hydraulic fracturing effect is influenced by an unstable drilling area generated by hole washing is overcome, the problems that the rock mass integrity is damaged by excessive drilling construction, rock mass fracture development between spaced drilling holes is increased, and the test result is inaccurate are effectively solved, the drilling integrity is guaranteed, secondary hole collapse is avoided, and the test efficiency is improved. And favorable conditions are created for later implementation of a hydraulic fracturing process.

Images