稠油重组分对砂岩储层润湿性变化的影响  

Effect of Heavy Constituent in Crude Oil on Wettability Change of Sandstone

作　　者：程亮 施雷庭[2] 叶仲斌[2] 王娟[3] 杨超 钟金银 

机构地区：[1]中国石油川庆钻探工程公司地质勘探开发研究院,四川成都610081 [2]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [3]中国石油西南油气田公司勘探开发研究院,四川成都610041 [4]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《油田化学》2016年第2期325-332,共8页Oilfield Chemistry

基　　金：国家高技术研究发展计划(863计划)海洋领域重点项目"渤海油田聚合物驱提高采收率技术研究"子课题"聚合物在线溶解和聚合物驱改善技术研究"(项目编号2007AA090701-3);国家重大专项"海上稠油化学驱油技术"(项目编号2008ZX05024-02)子课题"海上油田早期注聚及聚驱关键配套技术研究"(项目编号2008ZX05024-002-04)

摘　　要：为揭示稠油重组分性质与砂岩岩石润湿性变化之间的关系,用X射线光电子能谱和Zeta电位测定仪考察了不同产地稠油沥青质、胶质表面官能团及其Zeta电位,采用改进的岩心润湿定量测定方法研究了稠油重质组分(沥青质、胶质)Zeta电位与砂岩岩样润湿指数间的关系,分析了盐水中阴阳离子对吸附沥青质岩心润湿性的影响。结果表明,辽河沥青质因含较多的羧酸和钙元素(羧酸钙)而带负电荷,塔河、孤岛、克拉玛依和垦东沥青质及渤海、辽河和克拉玛依胶质带正电荷;沥青质、胶质正电性越强,岩石润湿指数变化程度越大,润湿指数(WR)与沥青质、胶质Zeta电位(ζ)间存在对数关系:ζ=-2.9508 ln(WR);盐水中的无机阳离子化合价价数越高,吸附沥青质岩心的润湿指数越小,而无机阴离子对润湿性变化影响甚微。通过润湿指数与沥青质、胶质Zeta电位间的定量公式可推算砂岩岩层润湿性变化趋势,通过调整注入水组成可控制沥青质沉积造成的润湿性变化程度。In order to reveal the relationship between heavy oil property and sandstone wettability,the functional groups and Zeta potential of asphaltenes and resins from different areas were investigated by X-ray photoelectron spectroscopy and Zeta potential analyzer. The relationship between Zeta potential of heavy constituents in viscous crude oil（asphaltene or resin）and sandstone wettability index was studied by the improved core wettability detection method and the effect of cations and anions in brine on core wettability where asphaltene had been adsorbed was analyzed. The results showed that the asphaltene of Liaohe oilfield carried negative charge because of a high mass fraction of carboxylic acid and carboxylic acid calcium,while asphaltene of Tahe,Gudao,Karamay and Kendong oilfield carried positive charge. The more positive charge of asphaltene and resin,the greater change of wettability index was. As a result,wettability index（WR）and Zeta potential（ζ）of asphaltene and resin constituted logarithmic function relation： ζ =-2.9508 ln（W_R）. Once the inorganic cation had a higher valence,there was a lower wettability index,while there was a slight impact of inorganic anion on wettability. The wettability change trend of sandstone rock could be estimated by the quantitative formula between wettability index and Zeta potential of asphaltene or resin,and the change degree of wettability caused by asphaltene deposition could be controlled by adjusting the composition of injection water.

关 键 词：沥青质 胶质 砂岩 润湿指数 ZETA电位 

分 类 号：TE258[石油与天然气工程—油气井工程]