Hydraulic fracturing surging method for bedrock well and system device thereof

Abstract

The invention provides a hydraulic fracturing surging method for a bedrock well and a system device thereof. The system device comprises a group of surface equipment which is formed by a fracturing pump, a manifold and a high-pressure water tap, and a well fracturing instrument which comprises one or more groups of packers which can be sent into the well and distributed on a working well section is arranged, wherein each packer is a cylindrical rubber elastic body with a ring chamber, and a constant pressure open valve is arranged among each group of the packers; a pitch unloading valve is arranged above the part adjacent to the upper packer; a bottom plug is arranged at the bottommost end of a drill; and the surface equipment is movably connected and communicated with a well drill rod in the well fracturing instrument through a high-pressure pipeline. During operation, the fluid enters the ring chamber of each group of the packers to expanse and seal the ring chamber; when the pressure of the system achieves to a certain value, a constant pressure valve is opened, and the fluid enters into the packer; and when the pressure of the system continuously increases and exceeds the tensile strength of rock, the rock is cracked to form new fracture which extends to a water storage structure, so that the water yield of the well is increased, and high-pressure fluid flushing surging for the existing fracture containing water can be realized.

Description

technical field [0001] The invention relates to a method for increasing water by hydraulic fracturing of bedrock water wells and a system device thereof. Background technique [0002] The main occurrence types of bedrock groundwater are carbonatite karst water and fissure and pore water in clastic rocks, igneous rocks, and metamorphic rocks. Wells are mostly formed with open holes or partial open holes. Due to the heterogeneity of the bedrock strata, the water storage structure, the distribution of fractures and the supply pathways are complex, and it is difficult to complete wells. Some wells have been surveyed and qualified for completion, but the drilled wells were scrapped due to too little water output. Most of the abandoned wells are caused by the following factors: ①The well (hole) is not drilled or deviates from the water storage structure; ②The fractures in the rock formation of the well (hole) have poor connectivity with the water storage structure, and the perme...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for increasing water by hydraulic fracturing of bedrock water wells, which can solve the problem that the wells (holes) that have the conditions for well formation deviate from the water storage structure or are blocked by the fillings contained in the cracks. ) The permeability of the water-bearing fractured layer is low, resulting in the small water yield of the well, the low well formation rate and the limitations of the traditional well washing and water increasing technology.

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