Multi-stage pulse high-frequency dynamic load fracturing method

Through the multi-stage pulse high-frequency dynamic load fracturing method, combined with oxygen-rich coal seam construction and continuous combustion and explosion impact fracturing technology, the shortcomings of existing hydraulic fracturing and explosion fracturing technologies are solved, and efficient and green mining of coalbed methane is achieved.

CN119712053APending Publication Date: 2025-03-28CHINA UNIV OF MINING & TECH
0 Cites 1 Cited by

Patent Information

Application Number
CN202510060947.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-15
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing hydraulic fracturing technology has problems such as high water consumption, reservoir clay expansion, groundwater pollution, and difficulty in handling reflux in unconventional natural gas development. In addition, conventional combustion and explosion fracturing is insufficient in the degree of reservoir fracture and the crack expansion direction is single in the development of shale gas.

Method used

The multi-stage pulse high-frequency dynamic load fracturing method is adopted to construct oxygen-rich coal seams and continuously burning and explosion impact fracturing operations, supercritical CO2 energy-intensive fracturing technology and high-pressure oxygen injection are used to form oxygen-rich coal seams, and the combustion aid agent is discharged, ignited and continuously burned and exploded, forming a high-quality three-dimensional crack network.

Benefits of technology

It significantly improves the mining efficiency of coalbed methane, avoids water resource consumption and groundwater pollution problems, forms a high-quality three-dimensional crack network, and achieves green and efficient mining of coalbed methane.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

A multistage pulse high-frequency dynamic load fracturing method comprises the steps that a coal seam and a cover layer horizontal well are drilled out, supercritical CO2 is used for fracturing an upper cover layer of the coal seam, and fracturing cracks are expanded to a target coal seam to form a crack network; injecting high-pressure oxygen into the horizontal well of the cover layer, and enabling the high-pressure oxygen to enter the low-permeability target coal seam to form an oxygen-enriched coal seam; tripping in a bridge plug; operation gas and fuel are charged into the burning and explosion tool, the burning and explosion tool is lowered, and the packer is set; high-pressure nitrogen is used for pushing a piston to move downwards, a constant pressure valve is opened, and a gaseous combustion improver enters a combustion explosion cavity to be mixed with a liquid alkyl compound; the piston is used for pushing the trigger needle to move downwards, so that the trigger linkage rod relieves limiting of the firing pin, the firing pin rapidly strikes gunpowder, and ignition operation is completed. The liquid alkyl compound is quickly burnt and exploded, potassium permanganate in the detachable hollow pipe is decomposed to generate a large amount of oxygen, and methane-oxygen mixed gas in a gap network is ignited while secondary burning and explosion occur. The method can obviously improve the mining efficiency of the coal bed gas.
Need to check novelty before this filing date? Find Prior Art