On July 22, high yield gas flow was obtained from fractured horizontal well Xushen-8 H-1 in Songliao basin, with a daily output up to 870,000 cubic meters.
Well Xushen-8 H-1 was completed on February 19, 2009 at a depth of 5,000 meters with the horizontal interval of 940 meters. The target zones of the well are volcanic gas reservoirs, featuring in thick gas-bearing formations, but low permeability and poor fracture opening, which led to unfavorable gas production by using conventional fracturing methods.
On June 17, 24 and 26, staged fracturing was applied to the open hole in order to effectively control fracture height and length, expand gas outlet area, and finally increase gas production of the well.