聚合物微球粒径与喉道匹配性研究  

Investigation into the matching between the size of polymer microspheres and pore throats

作　　者：蒲万芬[1,2] 赵帅[1,2] 王亮亮 梅子来 冯天 魏兵 PU Wanfen;ZHAO Shuai;WANG Liangliang;MEI Zilai;FENG Tian;WEI Bing(College of Petroleum Engineering,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;Exploration ＆ Development Research Institute,Liaohe Oilfield Company,Panjin City,Liaoning Province,124000,China)

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [3]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124000

出　　处：《油气地质与采收率》2018年第4期100-105,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"陆相致密油高效开发基础研究"(2015CB250904)

摘　　要：为实现对强非均质性油藏的控水增油,采用实验室自制聚合物微球PM1的微观形貌及粒度分布进行评价;通过岩心压汞法对岩心喉道分布进行测试,开展一系列岩心物理模拟驱替实验,并以粒度累积分布曲线上25%,50%和75%所对应的聚合物微球颗粒直径与平均喉道直径的比值作为匹配系数,综合研究聚合物微球粒径与喉道的匹配性。研究结果表明:聚合物微球PM1为微米级圆球状凝胶颗粒;由高才尼公式和岩心压汞法获得的平均喉道直径的差距较大。聚合物微球在不同匹配系数条件下的运移与封堵模式可划分为完全封堵、高效封堵、低效封堵和顺利运移。对于主要目的是实现近井地带调剖的油藏,应优先考虑高效封堵模式对应的匹配系数范围;若主要目的是实现微球深部调驱,应首先考虑低效封堵模式对应的匹配系数范围,从而筛选出适宜的聚合物微球粒径。与高才尼公式计算结果相比,岩心压汞法测试结果能更准确地反映岩心喉道分布,因此建议在实际措施中,应重点考虑岩心压汞法对应的匹配系数范围。In order to achieve water control and oil increment in the highly heterogeneous reservoirs,the micromorphologyand size distribution of polymer microspheres PM1 prepared in the laboratory were firstly evaluated. Then the pore throatsize distribution of cores was tested via mercury intrusion method and a series of core flooding experiments were carried out coupled with matching coefficients（the ratio of particle diameter corresponding to 25%,50% and 75% in the cumulative size distribution curve to average pore throat size）to investigate the matching between the size of polymer microspheres and pore throat. The results show that polymer microspheres PM1 were micron-sized spherical gel particles. Discrepancies exsist in the average pore throat size obtained from Kozeny theory equation and mercury intrusion method. The migration and plugging modes of polymer microspheres under varying matching coefficients can be divided into complete plugging, high-efficiency plugging,low-efficiency plugging and smooth pass. For reservoirs aiming at near-wellbore profile control,the matching coefficient range corresponding to the high-efficiency plugging mode should be taken into account at first. For reservoirs aiming at depth profile control and oil displacement,the matching coefficient range corresponding to the low-efficiency plugging mode should be used to determine the optimal microspheres size. Compared with the computed results based on Kozeny theory equation,the measurements based on mercury intrusion method can reflect the pore throat size distribution more accurately. Therefore,in the actual application,we suggest that more focus should be put on the matching coefficient range based on mercury intrusion method.

关 键 词：聚合物微球 喉道分布 匹配性 运移与封堵模式 匹配系数 

分 类 号：TE357.461[石油与天然气工程—油气田开发工程]