油湿灰岩储层中季胺类物质对周期注水开发效果的影响  

Effect of quaternary ammonium polymer on production behaviors of low-permeability and oil-wet limestone reservoir in cyclic water-flooding stage

作　　者：魏发林[1] 岳湘安[1] 叶仲斌[2] 张杰[3] 庞宏伟[1] 

机构地区：[1]中国石油大学提高采收率研究中心,北京102249 [2]西南石油学院石油工程系,四川成都610500 [3]大港油田研究中心,天津300280

出　　处：《石油学报》2005年第2期73-76,共4页Acta Petrolei Sinica

基　　金：国家重大基础研究(973)前期专项研究"低渗透油藏提高采收率基础研究(2002CCA00700)"阶段成果。

摘　　要：周期注水是开发灰岩储层低渗透基质中原油的一种有效方法,但对于亲油储层效果较差。对基质含水饱和度变化特征进行了分析,建立了基质含水饱和度变化特征方程,提出了周期注水与润湿反转技术相结合的开采方式。利用油湿灰岩裂缝模型,在注入水中加入低浓度具有润湿反转能力的季胺类物质———十六烷基三甲基溴化铵(CTAB)进行了周期注水室内模拟研究。结果表明,CTAB可使油湿灰岩储层的表面性质发生明显变化,基质毛管的自吸及滞水排油能力增强,周期注水开发效果明显改善。The cyclic water-flooding method is effective for development of oil in low-permeability matrix of limestone reservoir and unsuitable for the oil-wet reservoir. The changing characters of matrix water saturation were analyzed, and the equation for describing the change of matrix water saturation was derived. The laboratory experiment on cyclic water-flooding was made with oil-wet limestone reservoir models by adding cetyl trimethylammonium bromide (CTAB) with wettability alteration and low concentration into the injected water. The results showed that the surface property of oil-wet limestone reservoir changed towards that of water-wet reservoir greatly, and the capabilities of capillary imbibition, water storage and oil displacement were enhanced by using CTAB. The efficiency of cyclic water-flooding could be improved considerably.

关 键 词：低渗基质灰岩 裂缝 油湿储层 润湿反转技术 周期注水 模拟实验 季胺聚合物 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]