At 22 o’clock of May 1, Sinopec’s first fractured technological well – DPH-X, which has infinite-order cementing slide bushing adopted for well completion and coiled tubing with undersealing tool adopted for annular pressurizing and pushing slide bushing and annular sand adding, was constructed successfully in Daniu Gas Field.

        Well DPH-X is a horizontal well arranged in large 8 well area in Daniu Gas Field of Erdos, with the target stratum referring to Lower Shihezi Fm No. 1. The well has horizontal segment of 1,030 m long and designed layer of 10 segments, with secondary well structure adopted and Ф139.7 mm bushing plus slide bushing cementing used for well completion. In order to improve low-permeability gas reservoir exploitation effect of the well, special fracturing technology of coiled tubing with undersealing for dragging, annual pressurizing and pushing slide bushing and annual sand adding is adopted for well completion, thus achieving breakthrough in both fracturing technology and yield.