凝析油气藏气湿反转解水锁的实验研究  

Research on Water Block Removal by Wettability Alteration to Gas-wetting in Condensate Reservoir

作　　者：冯春燕[1] 孔瑛[1] 蒋官澄[2] 杨金荣[1] 蒲春生[1] 张玉忠[3] 李颖颖 

机构地区：[1]中国石油大学(华东)重质油国家重点实验室 [2]中国石油大学教育部石油工程重点实验室 [3]天津工业大学中空纤维膜材料与膜过程教育部重点实验室

出　　处：《钻井液与完井液》2011年第5期1-4,8,共5页Drilling Fluid & Completion Fluid

基　　金：国家自然科学杰出青年基金资助项目(50925414);国家自然科学基金(50973083);山东省自然科学基金(ZR2010EM014)项目资助

摘　　要：气湿反转是目前解决油气藏水锁损害的有效方法之一。通过溶胶-凝胶法和氟烷基甲基丙烯酸共聚物Zonyl 8740的修饰,使岩心表面的润湿性发生了气湿反转。通过做接触角测量实验,发现溶胶的陈化时间、溶胶-凝胶处理时间、热处理温度、氟化浓度和氟化时间对岩心的浸润性有明显的影响。毛细管上升实验结果表明,用溶胶和Zonyl 8740处理后,气/水体系和油/气体系中的润湿性由优先液湿转变为气湿。利用扫描电子显微镜对处理岩心表面的形貌和能谱进行分析显示,用溶胶和Zonyl 8740共同处理岩心后,岩心表面具备了微细的粗糙结构和低表面能物质。岩心驱替实验结果表明,通过Zonyl 8740处理后,岩心中水的渗透率比未处理时增大了4倍。The productivity of condensate reservoir that is water blocked can be enhanced by wettability alteration to gas-wetting.In this paper,sol-gel process and modification of the fluorochemical surfactant Zonyl 8740 were employed to alter the wettability of rock core surface.The experimental results showed that the wettability alteration was effected by the time of sol aging and deposition,heat treatment temperature,fluorination concentration and time.It was demonstrated that the wettability alteration to gas-wetting could be achieved with the fluorochemical surfactant Zonyl 8740 treatment,through capillary rise tests in both gas/water and gas/oil systems.Analysed by SEM,the rough structure and low surface energy mass was found on reservoir rocks surface after treated by sol and Zonyl 8740,and core water permeability increased by 4 times after treated by Zonyl 8740.

关 键 词：气湿反转 液湿 溶胶-凝胶 微细粗糙结构 含氟表面活性剂 

分 类 号：TE258[石油与天然气工程—油气井工程]