海上油藏聚合物微球/表面活性剂体系提高采收率技术:以涠洲11-4N油田涠洲组油藏为例  

Enhanced Oil Recovery Technology with Polymer Microspheres/Surfactant System in Offshore Reservoir:Taking Weizhou Formation Oil Reservoir in Weizhou 11-4N Oilfield as an Example

作　　者：周娅芹 王健[1] 樊康杰 路宇豪 魏鸿坤 ZHOU Ya-qin;WANG Jian;FAN Kang-jie;LU Yu-hao;WEI Hong-kun(State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Southwest Petroleum University,Chengdu 610500,China;Surignan Operation Area,Changqing Oilfield of China National Petroleum Corporation,Ordos 017000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中国石油长庆油田分公司苏里格南作业区,鄂尔多斯017000

出　　处：《科学技术与工程》2024年第36期15437-15446,共10页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(52174035)。

摘　　要：海上油藏因平台寿命原因,开发方式多为强注强采,油藏易进入高含水时期,稳产形势十分严峻。针对涠洲11-4N油田涠洲组油藏高含水开发后期,提出孔喉尺度聚合物微球/表面活性剂复合体系提高采收率技术。对聚合物微球Q-2和表面活性剂AP-1的性能以及复合体系的配伍性以及流变性进行评价;开展不同注入方式下的岩心驱替实验,优选聚合物微球和表面活性剂的注入方式,在此基础上,利用并联岩心模型开展复合体系的驱油效率评价实验;制作可视化模型,对复合体系的调驱机理进行实验研究。实验结果表明:微球初始粒径中值为3.755μm,老化30 d时膨胀倍数为2.15,残余阻力因子为2.50,表面活性剂能降低油水界面张力至0.018 5 mN/m,两者之间的配伍性较好,复合体系黏度与剪切速率间呈剪切稀释特性;聚合物微球和表面活性剂分注的后续水驱采收率可达22.84%,比混注的采收率增加了10.42%;注入复合体系后,并联岩心模型采收率提高18.79%以上,且复合体系对低渗岩心的改善程度随着并联岩心的渗透率级差增大而增大,可使低渗透岩心的采收率增加25.63%以上;调驱可视化实验表明,复合体系能够有效减少高、中渗通道中的无效水循环,启动小孔隙中的原油,提高整体驱油效率。研究成果为涠洲组油藏高含水开发后期提高采收率技术的现场应用奠定基础。Due to the extended lifespan of the platform,offshore reservoir development primarily relies on strong injection and recovery methods,resulting in an increased likelihood of entering a high water cut period,and the situation for stable production is critical.A pore-throat scale composite system consisting of polymer microspheres and surfactants was proposed to enhance the recovery rate of Weizhou Formation reservoir during its high water cut development phase in Weizhou 11-4N oilfield.The properties of polymer microspheres Q-2 and surfactant AP-1 as well as the compatibility and rheology of the composite system were evaluated.Core displacement experiments under different injection methods were carried out to optimize the injection method of polymer microsphere and surfactant.On this basis,the oil displacement efficiency evaluation experiment of the composite system was carried out through the parallel core model.The visual model was made to study the driving mechanism of the composite system.The experimental results demonstrate that the median initial particle size of the microspheres is 3.755μm,the expansion ratio is 2.15 after 30 days of aging,the residual resistance factor is 2.50,and the surfactants can reduce the interfacial tension between oil and water to 0.0185 mN/m.The compatibility between the two is good,and there is a shear dilution characteristic between the viscosity and shear rate of the composite system.The recovery rate of polymer microspheres and surfactants separated injection is 22.84%,which is 10.42%higher than that of mixed injection.After injecting the composite system,the recovery rate of parallel core model is increased by more than 18.79%.With the increase of the permeability grade difference of parallel core,the composite system improves the low permeability core more,and the recovery rate of low permeability core can be increased by more than 25.63%.The visualization experiment of flooding control and flooding shows that the composite system can effectively reduce the ineffective wate

关 键 词：涠洲组油藏 聚合物微球 表面活性剂 驱油机理 提高采收率 

分 类 号：TE341[石油与天然气工程—油气田开发工程]