地质力学学报2024，Vol.30Issue(3)：419-426,8.DOI:10.12090/j.issn.1006-6616.2023075
气顶砂岩油藏型储气库运行上限压力和库容量定量评价研究
Quantitative evaluation of maximum operating pressure and storage capacity for gas-top sandstone reservoir-type gas storage
摘要
Abstract
[Objective]The maximum operating pressure for underground gas storage facilities designed for oil and gas reservoirs,both constructed and under construction in China,is currently set at the original formation pressure.There have yet to be successful cases of overpressure operation,which significantly impacts the economic benefits of converting depleted oil and gas reservoirs into underground gas storage facilities.This article aims to evaluate the maximum operating pressure and storage capacity of the Nanpu 1-29 gas storage facility from the perspective of the ultimate bearing capacity of cap layers and faults,with the goal of effectively enhancing the construction benefits of the facility.[Methods]The evaluation of the maximum operating pressure for the Nanpu 1-29 gas storage facility in eastern Hebei is based on the minimum principal stress measured in situ in the mining wells.Different effective porosity calculation methods are employed to quantitatively evaluate the effective storage capacity of gas and oil reservoirs,as well as the incremental capacity after pressure boosting operation,based on their development differences.[Results]The evaluation of the maximum operating pressure for the Nanpu 1-29 gas storage facility indicates that the minimum principal stress of the cap layers determined by the in-situ measurements in the mining wells is 34.00 MPa.Based on the tensile failure criteria determined by the minimum principal stress,the maximum operating pressure for the tensile failure of the cap layer is 27.20 MPa.Combined with the maximum safe injection pressure corresponding to shear failure of the cap layer(30.60 MPa)and the maximum safe injection pressure corresponding to unstable slip of the fault(27.60 MPa),the final maximum operating pressure for the Nanpu 1-29 gas storage facility is determined to be 27.20 MPa.Based on the effective storage capacity calculation model,considering factors such as the water content of the gas reservoir,residual water and edge porosity as well as the coefficient of influence,the efficiency of gas-driven fluid,and the utilization rate of oil-containing space,the maximum operating pressure increased from the original formation pressure of 22.50 MPa to 27.20 MPa.The practical storage capacity of the gas storage facility increased from 15.46×108 m3 to 18.14×108 m3,an increase of approximately 17.3%.[Conclusion](1)The construction of gas storage facilities can be re-evaluated for the maximum operating pressure based on the minimum principal stress measured in situ in the mining wells,and overpressure design can be conducted under appropriate conditions.(2)Overpressure design can effectively increase storage capacity and improve the economic benefits of reservoir construction.[Significance]The research results have a certain reference value for the quantitative evaluation of the maximum operating pressure and storage capacity of other underground gas storage facilities,and are expected to significantly improve the economic benefits of overpressure-designed reservoir-type gas storage facilities in China.关键词
南堡1-29气顶砂岩油藏/地下储气库/地应力/上限压力/库容Key words
Nanpu 1-29 gas-top sandstone reservoir/underground gas storage/in-situ stress/maximum pressure/capacity分类
能源科技引用本文复制引用
胡彩云,李聪,杨智斌,贾倩,孙彦春,李超锋,孙军昌,杨跃辉,孙东生..气顶砂岩油藏型储气库运行上限压力和库容量定量评价研究[J].地质力学学报,2024,30(3):419-426,8.基金项目
中国石油勘探与生产分公司重点科技攻关项目(2022ZS0903) （2022ZS0903）
国家自然科学基金面上项目(42174122)This research is financially supported by the Key Science and Technology Research Project of the China National Petroleum Exploration and Production Corporation(Grant No.2022ZS0903)and the National Natural Science Foundation of China(Grant No.42174122). （42174122）
