Injection-recovery Technique of Urgent Peak Shaving for Underground Gas Storage,Dagang

As gas consumption in winter is increasingly serious in Beijing and Tianjin, the contradiction between supply and demand of natural gas is becoming obvious. Therefore, underground gas storage is required to have a peak-shaving ability in emergency. A research on how to enhance the ability of storage with 7 in production casing has been carried through. Comparing with 3 different pipe strings and according to field practice, a technique of 7 in casing matching with 4.5 in injection-recovery oil tube has been developed, which can enhance the peak-shaving ability, reduce the cost and investment. It makes the capacity of gas supply reach (100~120)×104m3/d.