Cracking permeability increasing method combining hydraulic fracturing and methane in-situ combustion explosion

US12078034B2 · kind B2 · utility

Assignee

• China University of Mining and Technology · CN

Inventors

• Wei Yang · 安丰镇, CN
• Zening Wei · Suzhou, CN
• Cheng Zhai · Xuzhou, CN
• Yihan Wang · 安丰镇, CN
• Wenyuan Wang · Keelung, TW
• Wenxiao Zhang · Suzhou, CN

Key dates

• Filing date: Dec 27, 2021
• Grant date: Sep 3, 2024
• Expiry date: Dec 27, 2041

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B7/046
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for shale gas exploitation includes performing horizontal drilling operation on an area to be constructed, forming a crack around a horizontal drill hole wall by shaped charge perforation; expanding the crack around a horizontal hole hydraulic fracturing, and extracting methane gas after a fracturing fluid is discharged; after methane gas is reduced, performing in-situ combustion explosion fracturing on the methane involved in horizontal drilling; thereafter continuing to expand the crack in the horizontal drill hole such that methane continues to seep out, and continuing extracting methane; repeating combustion explosion fracturing and extraction operations, so as to increase combustion explosion cracking permeability, and greatly enhance the exploitation effect of shale gas. The method is suitable for fracturing reconstruction of unconventional oil and gas reservoirs such as shale gas reservoirs, coal seam gas reservoirs and tight sandstone gas reservoirs.