Development technology of coalbed methane horizontal wells with staged fracturing in Zhengzhuang Field of Qinshui Basin

Abstract

Based on the characteristics of the No.3 coal seam and No.15 coal seam in Zhengzhuang Field and the need for low-cost and high-efficiency development of coalbed methane, a technical method for enhancing coalbed methane mining in non-cemented L-type staged fracturing horizontal wells in coal seams is proposed. The numerical simulation results show that hydraulic jet fracturing can produce 1.5-2.0 MPa annular sealing effect and 3.5-4.5 MPa hole pressurization effect, which can meet the purpose of annular air anti-channeling and fixed-point fracturing in the non-cemented horizontal wells. In view of the construction technology problems in drilling and completion, fracturing and drainage of non-cemented coalbed methane horizontal wells, four core key technologies have been explored, including “high-quality, fast and safe” drilling and completion technology, coiled tubing with bottom seal fast dragging jet-fracturing combined staged fracturing technology, “large displacement, large-scale, medium-sand ratio” active water fracturing stimulation technology, L-shaped horizontal well fine drainage control technology. Practice has proved that the non-cementing staged fracturing horizontal well development technology for coalbed methane has achieved large-scale application in Zhengzhuang Field, and achieved a double breakthrough in coalbed methane development technology and high gas production.

Keywords

• coalbed methane
• horizontal well
• staged fracturing
• developing technology
• qinshui basin
• zhengzhuang field