化学剂浓度对复合驱油体系流变性影响实验研究

Experimental research of the chemical agent concentration toward the rheological properties of ASP displacing fluids

唐钢 李华斌

Tang Gang Li Huabin

油气藏地质与开发工程国家重点实验室, 西南石油大学, 四川 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China

讨论了三元复合驱中化学剂浓度与驱油体系流变性的关系,通过实验研究了化学剂浓度对驱油体系表观粘度和静态吸附的影响。结果表明:随着碱浓度的增加,三元复合体系的表观粘度逐渐降低,零剪切粘度减低,剪切性能变差,缔合聚合物三元复合体系的粘度降低幅度最小;随着表面活性剂浓度的增大,体系表观粘度有-定的增加;碱和表面活性剂在岩芯砂上的吸附量随着它们平衡浓度的增加而不断增大,符合Langmuir吸附规律;缔合聚合物在岩芯砂上也存在吸附量峰值,但不符合Langmuir吸附规律。

This paper discusses the relationship between the chemical fluids concentration and the rheological properties of ASP displacing fluids, and researches into their influences on the apparent viscosity and static adsorption of displacing fluids. The result shows:with the increase of concentration of alkali, the viscosity of ASP chemical system reduces gradually, zero shear viscosity is lower, shear performance becomes bad; with the increase of concentration of surfactant, and the viscosity of ASP chemical system increases to some extent; with the increase of equilibrium concentration, the amount of adsorption of alkali and surfactant are increasing constantly, and fit the Langmuir adsorption law; the adsorption of HASWP in core sand also has peak value of adsorption capacity, however, it doesn't fit the Langmuir adsorption law.