Strategy for resuming production of tight gas reservoirs in Qingshimao: jet pump-rod pump integrated drainage gas recovery process

In the development of the tight gas reservoir in Qingshimao, the depth of gas well and high production of water often lead to difficulty in discharging the accumulated liquid bottomhole and a short stable production period after drainage gas recovery, which can easily cause water flooded and production stoppage, making the gas field dependent on conventional drainage and gas production processes. For this purpose, this article designs a two-stage lifting and composite drainage gas recovery process that combines a fixed reverse circulation jet pump with an anti-gas lock rod pump, and introduces tubing and inner tubing in the process. The bottom-hole inflow performance relationship (IPR) curve was obtained by fitting the exponential deliverability equation, and the pump-setting depth of the jet pump was determined by integrating the critical liquid-carrying rate. The pump-setting depth of the rod pump was then established based on the coordination between the jet pump and the rod pump. Using well Li-X in the Qingshimao gas field as a case study, the field application of the drainage gas recovery operation was carried out. To maintain dynamic balance between the jet pump’s liquid lifting volume and the rod pump’s drainage volume, 5 stroke frequency adjustments were made to the rod pump during operation. Field results show that, compared with the single jet pump drainage gas recovery operation, jet pump-rod pump integrated drainage gas recovery operation shortened the gas well resumption period by 50%. The self-spray production following the drainage gas recovery operation not only extended the stable production period of the gas well, but also increased the average daily gas production by 19.7% during the rapid production phase and by 19.6% during the stable production phase. Significantly improved the drainage gas recovery efficiency of the well, demonstrating the applicability of this technique in the Qingshimao tight gas reservoir.