剪切作用对乳状液性能及提高采收率的影响

Effect of shear action on emulsion properties and enhanced oil recovery

姚光明 何刚 郭程飞 张立举

陕西延长石油（集团）有限责任公司研究院，陕西 西安 710065 成都理工大学能源学院，四川 成都 610059 中国石化中原油田分公司地面工程抢维修中心，河南 濮阳 457001）

Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi′an 710065, China College of Energy Resources, Chengdu university of Technology, Chengdu 610059, China Ground Emergency Repair Center, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

为研究剪切作用对乳状液性能及提高采收率的影响，文中开展了搅拌速率、乳状液流变性、岩心流动以及乳状液驱提高采收率等实验。研究表明：在连续空间中，随着搅拌速率增加，岩心剪切作用增强，乳状液粒径越小，分布越集中，稳定性越好，黏度越高；在充分乳化条件下，随着剪切速率增加，乳状液黏度降低，表现为幂律流体特征。注入速度越高，岩心剪切作用越强，形成的乳状液液滴总量越多，乳状液表现出剪切增黏特征；达到充分形成乳状液的注入速度时，随着岩心剪切作用增强，乳状液表现出剪切稀释特征。乳状液驱存在最佳注入速度，可使乳状液驱提高采收率的效果最优。研究结果为现场开展乳状液驱提供了科学合理的注入方案。

 In order to study the effect of shear action on emulsion properties and enhanced oil recovery (EOR), experiments on stirring speed, rheological properties, core flow and oil displacement effect were carried out. The results show that the core shear action is enhanced with the increase of stirring rate, and the smaller the particle size of the emulsion, the more concentrated the distribution, the better the stability in continuous space, and the higher accordingly the viscosity of the emulsion. Under fully emulsified conditions, with the increase of shear rate, the viscosity of emulsion decreases, showing the characteristics of power law fluid. The higher the injection rate, the stronger shear effect for the core, the more the total number of formed emulsion droplets, and the emulsion showed shear viscosification characteristics. When reached the injection rate of fully formed emulsion, the emulsion showed shear dilution characteristics with the increase of core shear action. There is an optimal injection rate for emulsion flooding, which can maximize the EOR. The results provide the scientific and reasonable injection scheme for emulsion flooding in field.

10.6056/dkyqt202304019