摘要
粘弹性颗粒驱油剂B-PPG是一种全新的驱油剂,具有部分交联、部分支化的分子结构,分散于水中形成非均相的B-PPG悬浮液。采用稳态剪切和动态振荡实验,研究了不同质量分数、不同交联度的B-PPG在不同矿化度盐水中的流变特性,并分析其产生机理。结果表明,B-PPG悬浮液具有优异的粘弹性、耐盐性和增粘性。随着B-PPG交联度的增加,B-PPG悬浮液粘度呈下降趋势,B-PPG悬浮液粘性与弹性模量交点处频率(Fc)逐渐趋向低频;高矿化度使部分水解聚丙烯酰胺(HPAM)溶液的弹性减弱,而对B-PPG悬浮液模量影响较小,表明B-PPG较HPAM具有更优异的耐盐性;随着B-PPG质量分数的增大,B-PPG悬浮液线性粘弹区范围增大,且粘度明显增大,B-PPG悬浮液更加偏离牛顿流体,Fc值逐渐趋向低频;通过对其动态振荡曲线的线性拟合数据发现,B-PPG悬浮液表现出弱凝胶特性。
Branched-preformed particle gel(B-PPG)is a novel oil displacement agent,which has a crosslinked network and linear branched chains. When mixed with water or brine,B-PPG is not dissolved completely and the produced mixture is a heterogeneous suspension system. The rheological properties of B- PPG with different concentrations and different crosslinked degrees in brine were studied by steady shear and dynamic oscillation test;and the mechanism was also discussed from the viewpoint of molecular structure. The results show that B-PPG suspension has excellent viscoelasticity,salt tolerance and rheological properties. With the increase of crosslinked degree,the viscosity of B-PPG suspension decreases,as well as the frequency at crossing point of viscosity and elasticity(Fc). High salinity makes the elasticity of HPAM solution decrease and has few effects on B-PPG,which proves that B-PPG has better salt tolerance. The viscosity and linear viscoelastic region of B-PPG suspension increase and Fc decreases with increasing concentration. Moreover,BPPG suspension shows weak gel character by linear fitting of dynamic oscillation curve.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2015年第4期87-92,共6页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"高温高盐油田化学驱提高采收率技术"(2011ZX05011)
中国博士后科学基金资助项目"新型粘弹性颗粒驱油剂的制备与性能研究"(2014M560573)
关键词
部分交联
粘弹性颗粒驱油剂
流变特性
弱凝胶
非均质
partially crosslink
branched-preformed particle gel(B-PPG)
rheological property
weak gel
heterogeneous
