摘要
研究了以芥酸酰胺丙基甜菜碱黏弹性表面活性剂为主剂的自转向酸体系的流变特性。通过稳态剪切流动实验,得到鲜酸和残酸体系的本构方程分别为σ=0.0893γ^(0.803)(R^2=0.967)、σ=6.30γ^(0.383)(R^2=0.983),均符合幂律型非牛顿流体;两种酸液体系黏度随着剪切速率的增加而快速降低,鲜酸在100 s^(-1)时的黏度平台值约为40mPa·s,残酸在400 s^(-1)时的黏度平台值约为150 mPa·s。触变性实验表明,低剪切速率下鲜酸体系黏度下行线大于上行线,表现为复合触变性;残酸体系触变环面积小,剪切后结构易恢复。小幅振荡实验表明,鲜酸体系储能模量(G′)总是大于损耗模量(G″),且G′—G″曲线基本呈直线。残酸体系G″总是大于G′,在低频率下G′—G″符合Maxwell模型Cole-Cole图,表现出单一松弛时间的线性黏弹性;而在高频率下,G′—G″曲线又呈现直线趋势,显示出复杂的黏弹性。
The rheological properties of self-diverting acid system with erucylamide betaine viscoelastic surfactant as main reagent were studied. By the experiments of steady shear flow, the constitutive equations of fresh and residual acid systems were obtained as follows： tr =0.08937γ^0.803 （R^2=0.967）and tr =6.307γ383 （R2=0.983）, which were in line with the power-laws equations for non-newtonian fluids. The viscosity of two acid systems reduced rapidly with increasing shear rate. Under shear rate of 100 s^-1, the viscosity platform value of fresh acid was about 40 mPa. s, and that of residual acid was about 150 mPa. s at 400 s^-1. The thixotropic experiment results of two acid systems showed that at low shear rate, the viscosity on downline of fresh acid system was higher than that on upline, which indicated the composite thixotropy. For residual system, the area of thixotropic loop was small which indicated good recovery of structure after shear. The small oscillation experiment results showed that in fresh acid system, storage modulus （G＇） was bigger than loss modulus （G＂）, and the curve of G＇--G＂ basically exhibited in beeline. However, in residual acid system, G＂ was bigger than G＇, and the curve of G＇-G＂ was in line with Cole-Cole diagram of Maxwell model at low frequency, which suggested a linear viscoelastic behaviour with a single relaxation time. Whereas, under high frequency, the curve of G＇-G＂showed linear trends, indicating a complex viscoelastic behaviour.
出处
《油田化学》
CAS
CSCD
北大核心
2013年第1期14-17,共4页
Oilfield Chemistry
基金
湖北省教育厅科学技术研究项目"低渗非均质油藏变黏酸自转向行为研究"(项目编号Q20111308)
湖北省自然科学基金项目"煤层气中低温清洁压裂液技术研究"(项目编号2011CDC055)
关键词
芥酸酰胺丙基甜菜碱
自转向酸
本构方程
触变性
黏弹性
erucylamide betaine
self-diverting acid
constitutive equation
thixotropy
viscoelatic
