Abstract:

Due to the own application conditions of the electric submersible pump and other drainage and gas recovery technologies, they cannot adapt to different drainage and gas recovery periods of shale gas wells in the south block of Pingqiao. In order to solve these problems, the technical adaptability analysis and countermeasures of shale gas drainage and recovery technology were carried out. Based on the analysis of the problems of electric submersible pump, jet pump and gas lift drainage and recovery process, the composite drainage and recovery process string combined by electric submersible pump and gas lift is designed according to the formation pressure characteristics of different drainage and recovery periods of shale gas wells of the south block in Pingqiao. The composite drainage and recovery process string consiste of ? 73 mm oil pipe, gas lift valve, intelligent switch and electric submersible pump. In the early production stage of shale gas wells, when the formation liquid supply capacity is sufficient, the electric pump drainage lifting process string is adopted. In the later drainage and recovery stage, when the submergence of submersible pump decreases to 100~200 m, the gas lift drainage and recovery process is adopted. This composite string overcomes the deficiency of electric submersible pump, jet pump and gas lift single drainage and recovery process, making one production string adapts to different drainage and recovery periods of shale gas wells possible, and finally realizing the continuous drainage and recovery of shale gas drainage and recovery wells.

Key words: shale gas, drainage and gas recovery, composite drainage gas recovery technology, adaptability