FEASIBILITY STUDY ON RECONSTRUCTING BAN 814 FAULT-BLOCK RESERVOIR INTO UNDERGROUND GAS STORAGE IN DAGANG BANQIAO AREA

Underground gas storage is a major tool for the seasonal gas peak shaving in city and gas supply safety when an accident takes place.The built-up Dagang underground gas storage group plays a significant role in the development of Beijing and Tianjin area.The growing natural gas demand urges the industry to seek and construct new underground gas storage.Therefore,this paper summarized the optimized standards for underground gas storage and comprehensively appraised the construction based on the Ban 814 fault-block in Dagang Banqiao area in terms of gas reservoir structure,sealing property of fault and cap formation,physical property of the reservoir and estimate on gas storage's volume and the treatment of oil wells.It demonstrated that the Ban 814 fault-block can be applied to construct underground gas storage in terms of geology,old well treatment and surface environment,etc.The design proposal for the underground gas storage based on the Ban 814 fault-block was decided in accordance with the planning and design rule of gas storage.It has been concluded that only five directional wells are needed to be drilled during reconstruction(two injection-production wells and three relief wells);the compressor and surface pipeline resources of Banzhongbei gas storage can be fully used to save tremendous amount of investment.