Hole-sealing, hydraulic-fracturing and gas-extraction integrated construction device and construction method thereof

Abstract

A hole-sealing, hydraulic-fracturing and gas-extraction integrated construction device comprises a first bag, a second bag, a grouting pipe, a hydraulic fracturing pipe, a gas extraction pipe and a perforated pipe. The first bag is arranged in a drilled hole and located near a hole opening, the second bag is arranged in the drilled hole and located near the hole bottom, the grouting pipe and the gas extraction pipe both sequentially penetrate through the first bag and the second bag from left to right and then extend into the hole bottom, and the left end of the perforated pipe is coaxially and fixedly connected with the right end of the gas extraction pipe. The outer diameter of the hydraulic fracturing pipe is smaller than the inner diameter of the gas extraction pipe, the hydraulic fracturing pipe is coaxially arranged in the gas extraction pipe and the perforated pipe, and the right end of the hydraulic fracturing pipe rightwards extends out of the right end of the perforated pipe. The invention further discloses a hole-sealing, hydraulic-fracturing and gas-extraction integrated construction method, that is, after a hydraulic fracturing procedure, the hole continues to be used for gas extraction; and a novel layer-penetrating fracturing-gas extraction integrated hole drilling and sealing process is provided, the good versatility of the drilled hole is guaranteed, the number of drilled holes is reduced, and the construction cost is lowered accordingly.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to an integrated construction device for hole sealing, hydraulic fracturing and gas drainage and a construction method thereof. Background technique [0002] For high gassy coal seams with poor air permeability, hydraulic fracturing technology can increase coal seam fractures, on the one hand, reduce mine pressure and promote gas analysis; on the other hand, improve coal seam air permeability and increase gas migration channels. At present, hydraulic fracturing technology has been applied in the outburst prevention projects of many coal mines in my country. Hydraulic fracturing requires sealing the hole to suppress pressure, and gas drainage requires the hole to be tightly sealed before it can be connected to the network for drainage. However, the existing sealing technology is too complicated and cumbersome, and the sealing effect is limited. It is n...

AI Technical Summary

Problems solved by technology

Hydraulic fracturing requires sealing the hole to suppress pressure, and gas drainage requires the hole to be tightly sealed before it can be connected to the network for drainage. However, the existing sealing technology is too complicated and cumbersome, and the sealing effect is limited. It is not suitable for hydraulic pressure punching and can quickly seal the hole. , improve the sealing effect, and continue to use the requirements of gas drainage

Images