苏北盆地张家垛阜三段油藏岩心CO2-EOR数值模拟OA
CO2-EOR numerical simulation in cores from the Third Member of the Funing Formation in Zhangjiaduo oilfield,Subei Basin
二氧化碳强化石油开采(CO2-EOR)是目前全球广泛应用的油田增产和碳封存技术之一."双碳"目标导向下,CO2-EOR数值模拟需考虑非独立水相对相间传质的影响,实现CO2 在油、气、水三相溶解分布的刻画.基于苏北盆地张家垛阜三段油藏实际储层条件,采用多相流数值模拟软件TOGA建立岩心驱替模型,实现三相全组分互溶模拟.通过模拟不同压力和注气速率下CO2 与油藏流体的相互作用,实现了研究区储层条件下CO2 在水、气、油三相中溶解性的差异性刻画,揭示了混相驱油机理.模拟结果表明,研究区发生混相驱的最小混相压力为30 MPa,此时油气界面张力接近0.混相驱替显著提高了石油采收率,如38,10 MPa围压下的采收率分别为85%,52%.CO2在油相中的溶解性远大于其在水相中的溶解性,随着围压的增加CO2 在油、水两相中的摩尔百分数均提高,在22,38 MPa的围压下,水相中迁移的CO2 摩尔百分数分别为 1.8%,2.1%,油相中迁移的CO2 摩尔百分数分别为 70%,80%.研究区储层条件能够实现混相驱油,同时也有利于碳封存;提高CO2 注入速率可以提高生产效率,但对采收率和CO2 封存量的影响较小,还会增大气窜风险.研究成果为张家垛阜三段油藏的场地模拟和泄漏风险评估提供了技术参考.
CO2-enhanced oil recovery(CO2-EOR)is currently one of the most widely applied technologies worldwide for oilfield production stimulation and carbon sequestration.Under the"dual carbon"goals,numerical simulation of CO2-EOR needs to consider the effect of interphase mass transfer by the non-independent water phase,so as to characterize the multiphase dissolution distribution of CO2.[Objective and Methods]Based on actual reservoir conditions of the Third Member of the Funing Formation in Zhangjiaduo Oilfield,Subei Basin,this study used the multiphase flow numerical simulation software TOGA to establish a core displacement model,and realized the simulation of three-phase full-component miscibility.By simulating the interactions between CO2 and reservoir fluids under different confining pressures and gas injection rates,the differences in CO2 solubility in the water,gas,and oil phases under the actual reservoir conditions of the study area were characterized,revealing the miscible flooding mechanism.[Results]The simulation results indicated that the minimum miscible pressure for miscible flooding in the study area was 30 MPa,at which the oil-gas interfacial tension approached zero.Miscible displacement significantly improved oil recovery,with recovery rates of 85% and 52%under confining pressures of 38 MPa and 10 MPa,respectively.CO2 solubility in the oil phase was much greater than in the water phase,and with increasing confining pressure,the mole fractions of CO2 in both oil and water phases increased.At confining pressures of 22 MPa and 38 MPa,the mole fractions of CO2 migrating in the water phase were 1.8% and 2.1%,respectively,while those in the oil phase were 70% and 80%,respectively.The reservoir conditions in the study area can achieve miscible flooding,which is also conducive to carbon storage.Increasing the gas injection rate can improve production efficiency,but has a little effect on the ultimate oil recovery and CO2 sequestration capacity,while potentially increasing the risk of gas channeling.[Conclusion]This study provides technical references for field simulation and leakage risk assessment of the Third Member of the Funing Formation in Zhangjiaduo oilfield.
纪文宇;傅浩宇;王德喜;杨正茂;陈雨菡;施小清
南京大学地球科学与工程学院,南京 210023南京大学地球科学与工程学院,南京 210023中国石化华东油气分公司,南京 210011中国石化华东油气分公司,南京 210011中国石化华东油气分公司,南京 210011南京大学地球科学与工程学院,南京 210023
天文与地球科学
二氧化碳强化石油开采(CO2-EOR)混相驱替数值模拟溶解迁移注气速率围压苏北盆地驱油机理
CO2-enhanced oil recovery(CO2-EOR)miscible floodingnumerical simulationdissolution and migrationgas injection rateconfining pressureSubei Basinoil displacement mechanism
《地质科技通报》 2026 (2)
58-67,10
江苏省碳达峰碳中和科技创新专项资金项目(BE2022603)国家自然科学基金项目(42272276)
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