杨杰;董朝霞;向启贵;雷宇;胡金燕;彭锋;王兴睿;

• 1:中国石油西南油气田分公司安全环保与技术监督研究院

• 2:中国石油大学(北京)科学技术研究院

• 3:页岩气评价与开采四川省重点实验室

摘要(Abstract)：

低矿化度水驱能改变砂岩表面润湿性,注入低矿化度水使体系pH升高。当岩心初始饱和水为酸性时,利用岩心自渗吸和接触角实验,在宏观上研究自渗吸盐水pH升高对砂岩表面润湿性的影响,结合Zeta电位测试解释pH升高改变砂岩表面润湿性的机理;利用极性模拟油组分砂岩表面吸附实验,结合分子模拟在微观上分析自渗吸盐水pH升高改变砂岩表面润湿性的机理。实验及分子模拟结果表明:当初始饱和水为酸性时,原油中的石油酸电离被抑制,以羧酸分子形式存在,碱组分电离而带正电,羧酸分子、正电性碱组分分别通过氢键和库仑力(静电引力)吸附在砂岩表面的负电性硅氧基团上。由于吸附的酸碱组分另一端为烃基,砂岩表面亲水性减弱,当体系pH升高时,吸附在砂岩表面上的羧酸分子电离而成负电性羧酸根,碱组分电离被抑制而成电中性碱,在负电性羧酸根与砂岩表面负电性硅氧基团之间存在库仑力,电中性碱组分与硅氧基团之间的范德华力不足以自行吸附在砂岩表面的基团上,导致酸碱组分从砂岩表面脱落,砂岩亲水性增强。

关键词(KeyWords)：pH升高;吸/脱附;库仑力;氢键;表面润湿性;砂岩;低盐水

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2011ZX05052-002)

作者(Author):杨杰;董朝霞;向启贵;雷宇;胡金燕;彭锋;王兴睿;

Email:

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