Method of Determining the Upper Limit Pressure of Gas Storage Operation and Its Application in the Banzhongbei Gas Storage
The Banzhongbei Gas Storage in the Dagang Oilfield is located on the upcast side of the Banqiao Fault,which is a fault block gas storages and a semi-anticlinal structure cut by faults.The loading capacity of faults and capping formation determines the high limit pressure for the gas storage operation.To address the lack of considera-tion of mechanical integrity in determining the upper limit pressure of gas storage operation,this study evaluates the hydraulic sealing ability of the cap rock and the stability of faults in the study area from the perspective of geome-chanics.This evaluation is based on comprehensive data including 3D seismic interpretation results,XMAC logging stress interpretation results,and rock mechanics tests.It utilizes the theory of rock brittle fracture to determine the upper limit pressure for the safe operation of gas storage considering mechanical integrity.The results show that the upper limit pressure of the hydraulic sealing capacity of the cap rock in the Banzhongbei Gas Storage is 39.30 MPa,and the weak point of fault stability is at the intersection of two faults with a minimum activation pressure of 30.57 MPa.By considering the upper limit of cap rock hydraulic sealing capacity and fault stability,the upper limit pres-sure for the operation of the Banzhongbei Gas Storage is determined to be 30.57 MPa,which is reasonably close to the design operating upper limit pressure of 30.50 MPa.The research findings have significant guiding for the de-sign of upper limit pressure for gas storage operation.
cap rockhydraulic sealing capacityfault stabilityhigh limit pressureBanzhongbei Gas StorageDagang Oilfield
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