Evaluation of Underground and Surface Integrated Injection Production Operation in Gas Storage of Depleted Gas Reserve
In order to diagnose and evaluate the injection-production operation status and single well injectivity and productivity of fractured-porous gas storage,an integrated model of fractured-porous reservoir-wellbore-surface by considering stress sensitivity is proposed for the gas storage in Zhongyuan oilfield.An integrated simulation is utilized to analyze the influencing factors of the injectivity and productivity of gas storage,diagnose the limitations of injection-production operation status,and evaluate the injectivity and productivity of gas storage with the constraints of formation pressure and gas injection and production limits.The study indicates that wellhead and bottom-hole pressures and tubing size significantly impact the gas injection volume and production of gas storage.The gas reservoir pressure is lower than 27 MPa,and the stress suffered exceeds 50 MPa;the gas productivity index is significantly decreased,and the stress sensitivity is enhanced.There may be a critical unloading gas flow rate in the gas storage at low pressure,but there is no impact of erosion.The reasonable gas injection volume at the current pressure is 71×104 m3/d,and the reasonable gas production is 43×104 m3/d.This study can provide a reference for evaluating fractured-porous gas reservoir injection-production operations.
Fractured-porous typeGas storageIntegrationInjection-production operationInjectivity and productivityEvaluation
NETL
NSTL
万方数据
维普
