部分交联聚丙烯酰胺悬浮液的触变性及屈服应力  

Research on Thixotropy and Yield Stress of Partially Cross-Linked Polyacrylamide Suspension

作　　者：姜祖明[1] 曹绪龙[1] 李振泉[2] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015 [2]中国石化胜利油田分公司,山东东营257015

出　　处：《石油学报（石油加工）》2015年第4期996-1002,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家科技重大专项(2011ZX05011);中国博士后科学基金项目(2014M560573)资助

摘　　要：通过流变学研究了部分交联聚丙烯酰胺PCPAM悬浮液的触变性及屈服应力。对PCPAM悬浮液施加阶跃剪切速率,从剪切应力的响应发现PCPAM悬浮液为触变性流体;采用稳态剪切测试研究了不同交联度、不同质量分数的PCPAM悬浮液的剪切应力与剪切速率关系,计算出触变环面积大小,表明PCPAM悬浮液为触变可控的弱触变性流体,并提出了PCPAM的触变机理。采用Herschel-Bulkley模型拟合测试数据,结果表明,PCPAM为具有低屈服应力的剪切变稀流体,低交联度或高质量分数的PCPAM悬浮液屈服应力值高,且质量分数对PCPAM屈服应力值影响显著。此外,建立了PCPAM悬浮液在多孔介质里运移时的渗流模型。Partially crosslinked polyacrylamide （PCPAM） is a novel oil displacement agent, which not only has a crosslinked network but also linear branched chains. Thixotropy and yield stress of PCPAM suspension were studied. A sudden reduction in shear rate was applied to PCPAM suspension and from the response of shear stress, PCPAM is proved to be a thixotropic fluid. Then the thixotropies of different crosslinking degree and different concentrations of PCPAM suspension were studied by thixotropy-loop. It showed that PCPAM suspension was a controllable weak thixotropic fluid and the thixotropic mechanism of PCPAM was proposed. The yield stress of PCPAM suspension was studied by fitting σ-γ curve according to Hersehel-Bulkley model. It revealed that PCPAM suspension was a shear thinning fluid with low yield stress, and the low crosslinking degree and the high concentration of PCPAM suspension both have a larger yield stress. Moreover, a flow model is proposed for PCPAM suspension flowing through porous media.

关 键 词：部分交联 流变 触变性 屈服应力 渗流模型 

分 类 号：O631.4[理学—高分子化学]