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.

某油田天然气开发形势日益严峻,通过近几年天然气降耗工作的持续开展,实践了火炬气回收工艺、罐顶气回收工艺、加热炉提效改造等节气技术,优化了压缩机排液制度、分离器脱水温度、加热炉启停、气举采油配气、自压外输、低温外输等运行管理,多种节气措施的应用使集输系统的放空气量、自用气量明显下降,达到了节能减排与提质增效的目的,同时对未来进一步降低天然气使用量提出了建设性的意见.

进入高含水期的断块油藏虽然综合含水已经高达90％以上,但是仍然有较大的剩余油挖潜空间,如何采取合适恰当的方式实现高含水期断块油藏的挖潜至关重要.基于此,本文在分析高含水期断块油藏开发方式面临问题基础上,就各类分采技术的应用实践进行了详细阐述.

针对注水油藏改建储层库微观渗流机理问题,本次研究首先进行注气速度及储层性质对库容的影响研究,了解多次注气采气循环作业后的渗流特征,最后进行多次注采作业后对库容及渗流能力的影响分析,为推动我国注水油藏改建储气库的进一步发展奠定基础.研究表明:在改建储气库的初期阶段,需要选择一个合理的注气速度,同时还需要考虑形成次气顶以后的强注问题,以此防止气井将油藏内的水资源封隔,增大水锁气的量;对储气库进行多次注采作业以后,其库容和注采能力都会得到一定程度的提升,这十分有利于注水油藏改建储气库.

合理的注采压力系统是油田高效开发的关键,南堡油田1号构造南堡1-5区是典型的复杂断块油藏,受储层发育条件及构造影响,进入中高含水阶段后采油速度降低,水驱开发效果不理想,断块间开发水平差异较大.本文利用油藏工程方法及采油工艺基本原理对不同开发阶段合理油井流压、合理地层压力、合理注水井井底流压进行研究并建立评价体系,得出各断块合理的注采压力系统及调整方案,认为合理的注采系统随开发阶段的不同变化,需要根据开发特征与目标动态调整.本次研究对提升区块各开发阶段的开发水平具有一定的指导意义.