Drilling began on April 14 and was completed on May 20 at a distance of 5,058 meters. The horizontal section is 1,500 meters long. Difficulties that were overcome included the easy leakage in the Liujiagou low pressure formation, the possible collapse in the Shihezi formation, and the difficulty in controlling the long borehole trajectory in the horizontal section.  The long open hole section had operational problems such as different pressure coefficients and poor side-wall stability coefficients. During the construction, the company and the Sulige project leaders and technical team actively communicated and discussed with Party A, integrated the technical experience of other well sites in the block, and investigated the down-hole data. By analyzing the potential risks, a detailed production plan with technology measures was formulated. Starting from bit selection, strengthening parameters, and optimizing trajectory, one strategy for each section was strictly implemented. A technical research team was set up to implement operational measures and to monitor every aspect of the construction process.

Well Su 36-21-10H2 is located in Sumitu Sumusi Bukou Gacha, Ordos City, Inner Mongolia Autonomous Region. It is a developmental horizontal well in Block 36-11 of Suligesu, also located in Changqing Oilfield Company. It is a key risk, ultra-deep well on the Yixia Slope of the ancient Ordos Basin in Inner Mongolia.