气润湿性对蒙脱土性能的影响  

Effect of Gas-Wetting on the Dispersing Properties of Clay Minerals in Condensate Gas Reservoir

作　　者：蒋官澄[1,2] 黎凌 李颖颖[1,2] 许伟星[1,2] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油川庆钻探钻采工程技术研究院,四川广汉618300

出　　处：《油田化学》2013年第3期341-345,共5页Oilfield Chemistry

基　　金：国家自然科学杰出青年科学基金项目"多孔介质油气藏气润湿性基础理论研究"(项目编号50925414);国家科技重大专项"复杂结构井优化设计与控制关键技术"(项目编号2011ZX05009-005-03A);国家自然科学联合基金重点支持项目"复杂地层条件下;提高井壁稳定性新方法研究"(项目编号:U1262201)

摘　　要：实验室自制出的一种氟碳气湿反转剂FC-1可使凝析气藏岩石表面润湿性反转为气润湿性并大幅度增加气藏产量。当气藏岩石表面润湿性改变后,岩石中黏土矿物性能也会发生变化。本文考察了经气湿反转剂FC-1处理前后蒙脱土的性能。实验结果表明：当FC-1质量分数为100%时,100率200目蒙脱土Zeta电位从处理前的-31.70mV升高到-17.27mV,逐渐接近不分散状态;随着FC-1质量分数的升高,蒙脱土的阳离子交换容量急剧下降,当FC-1质量分数为100%时,亚甲基蓝容量MBC从处理前的2.14下降至0.2;FC-1质量分数为100%时,16h后蒙脱土最大膨胀高度为0.83mm;SEM、TEM分析结果表明,气湿反转剂FC-1中的含氟烷基已经附着在蒙脱土颗粒表面上,形成一层气湿反转膜,维持了蒙脱土的稳定性能。The condensate gas reservoir output could be enhanced significantly with a fluorocarbon gas-wetting reversal FC-1 developed in laboratory. However, the changes in the wettability will affect the dispersing properties of clay minerals in condensate gas reservoir. The properties of montmorillonite were studied before and after FC-1 treatment. The results showed that when the mass fraction of FC-1 was 100%, zeta potential of montmorillonite of 100 to 200 meshes increased from -31.70 mV to -17.27 mV, approaching to non-dispersion condition gradually. With the increase of the FC-1 concentration, cation exchange capacity dropped sharply and Methylene blue capacity droped from 2.14 to 0.2 when the mass fraction of FC-1 was 100%. The max swelling height of montmorillonite treated with 100% FC-1 was 0.83 mm after 16 h. The montmorillonite crystal aggregation form and micro-shape were analyzed by TEM and SEM. Conclusions were drawn that fluoridated alkyl groups of FC-1 had been attached on the surface of montmorillonite particles and formed a gas-wetting reversal film which maintains their stability.

关 键 词：气润湿性 ZETA电位 膨胀分散性能 阳离子交换容量 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] TE39