摘要
三相泡沫相比两相泡沫具有较强的稳定性和较高的表观黏度，其流变性直接影响各种油田作业的进行，是进行水力计算的关键。对此，利用实验方法对不同固相类型、不同固相浓度、不同泡沫质量泡沫体系的流变特性进行了研究，分析了影响三相泡沫体系流变性的主要因素。结果表明：三相泡沫和两相泡沫一样具有剪切变稀的特性，其流变行为符合幂律流体的流变特性。相比于水泥和聚合物微球，膨润土形成的三相泡沫体系具有更高的黏度，但聚合物微球形成的三相泡沫体系抗高速剪切的性能最强。高剪切速率下，表观黏度随着固相浓度的增加而增加。低剪切速率下，表观黏度随着固相黏度的增大先增加后趋于不变。三相泡沫体系的表观黏度随着泡沫质量的增大而增大。泡沫质量为65％～95％，流变方程均符合幂律流体的流变模式，其中，稠度系数和流变指数均随着泡沫质量的增大而增大。
Compared with two-phase foam, three-phase foam has strong stability and apparent viscosity, and its theological property can directly influence field operation, therefore, three-phase foam is the key to hydraulic calculation. Accordingly, experiment methods are adopted to study rheological characteristics of different kinds of solid phase, different concentration of solid phase, and different foam quality, furthermore, the main factors affected rheologieal property of three-phase foam system are analyzed. The re- sults show that, both three-phase foam and two-phase foam have characteristics of shear thinning, and their rheologieal property conforms to the rheologieal characteristics of power law fluid. Compared with cement and polymer microsphere, the three-phase foam system formed by bentonite has higher viscosity, however, the three-phase foam system formed by polymer microsphere has the strongest high-speed shear resistance. When the shear rate is high, the apparent viscosity increases with the increase of solid concentration, and when the shear rate is low, the apparent viscosity increases first and then becomes constant with the increase of solid concentration, moreover, apparent viscosity of three-phase foam system increases with the increase of foam quality. When the foam quality is between 65 % and 95 %, rheological equations are all in accordance with rheologieal characteristics of power law fluid, among which consistency coefficient and rheologie index increase with the increase of foam quality.
出处
《油气藏评价与开发》
CSCD
2016年第6期51-54,共4页
Petroleum Reservoir Evaluation and Development
基金
陕西省自然科学基金项目"低渗透砂岩油藏氮气泡沫辅助CO_2驱提高采收率机理研究"(2013JQ7019)
陕西省教育厅科研计划项目"低渗透裂缝性油藏三相泡沫体系调驱机理研究"(14JK1564)
关键词
三相泡沫
固相
泡沫质量
流变特性
three-phase foam, solid phase, foam quality, rheological behavior
