Method for fracturing fractured rock mass by filling high-pressure water with strong plastic material

Abstract

The invention discloses a method for fracturing fractured rock mass by filling high-pressure water with a strong plastic material, and relates to the field of hydraulic fracturing of fractured rock mass. The purposes that water pressure is more concentrated, fractured cracks are larger and more sufficient, the relative crushing degree of rock mass is large, and the crushing effect is more obvious can be achieved. After a hole is drilled in a rock mass, a strong plastic material is firstly arranged in the drilled hole, and then high-pressure water is injected for hydraulic fracturing. The plastic material with extremely strong tension and degradable property after meeting water can achieve the purposes of constraining high-pressure water and concentrating the hydraulic fracturing fractured rock mass in the subsequent hydraulic fracturing fractured rock mass process; meanwhile, through sealing of degradable materials, filled water cannot flow out, water pressure cannot be lowered, water pressure can be concentrated to break rocks at the moment, the materials are made to expand continuously, and when the expansion pressure is larger than the bearing capacity of surrounding rocks, the rocks can be expanded to a certain degree, and fractures are larger and more sufficient.

Description

technical field [0001] The present invention relates to the related field of using hydraulic fracturing technology to crack cracked rock mass, and in particular provides a plastic material with extremely strong tension and degradable characteristics after encountering water, which can bind high-pressure water in the subsequent hydraulic fracturing process, The purpose of concentrating hydraulic pressure on fractured rock mass. Background technique [0002] In the prior art, hydraulic fracturing technology is mainly used in the field of coal mine or shale oil exploitation. In coal mine, it is mainly used for roof cutting and pressure relief of coal mine roof, high-gas coal seam permeability enhancement, roadway expansion, and replacement of explosive blasting technology. Rock tunnel excavation, etc. The main principle is that by drilling a hole in a hard rock mass and injecting high-pressure water, when the stress around the drill hole reaches the crack initiation condition ...

AI Technical Summary

Problems solved by technology

Traditional hydraulic fracturing such as Figure 1-2 As shown, the fracturing fluid is easily lost along with the fractures, resulting in pressure release, which affects the final effect of hydraulic fracturing

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