Zhang Leilei, Wang Keliang, An Huiming, Su Yu, Zhang Wei, Li Gen, Yang Xinyi
Key Laboratory of Enhanced Oil and Gas Recovery Ministry of Education, Northeast Petroleum University, Daqing 163318, China.
Baili College of Petroleum Engineering, Lanzhou City University, Lanzhou 730070, China.
ACS Omega. 2022 Aug 10;7(33):29406-29414. doi: 10.1021/acsomega.2c03653. eCollection 2022 Aug 23.
Aiming at the phenomenon that the emulsification degree of the composite oil displacement agents affects the recovery factor, composite oil displacement agents of the P/S binary system and the A/S/P ternary system were taken as research objects. Emulsion particle size and stability were tested and evaluated, and the effects of the surfactant and alkali content on the emulsification degree of emulsion were investigated. The concept of the emulsification stability index and its measuring method were put forward, and a method was used to test and evaluate the emulsification stability of the emulsion. The results showed that the emulsion formed by the ternary system had the smallest average particle size, the best stability, and the best emulsification stability. The binary composite system was second, and the polymer solution did not form an emulsion. The emulsification stability index method could effectively quantify the emulsification degree of the emulsion. Within a certain range, the increase of the surfactant and alkali content in the composite oil displacement agent was beneficial to the improvement of the emulsification degree of the emulsion.
针对复合驱油剂乳化程度影响采收率的现象，以P/S二元体系和A/S/P三元体系复合驱油剂为研究对象。对乳液粒径和稳定性进行了测试与评价，考察了表面活性剂和碱含量对乳液乳化程度的影响。提出了乳化稳定性指数的概念及其测定方法，并采用该方法对乳液的乳化稳定性进行了测试与评价。结果表明，三元体系形成的乳液平均粒径最小，稳定性最好，乳化稳定性最佳。二元复合体系次之，聚合物溶液未形成乳液。乳化稳定性指数法能有效量化乳液的乳化程度。在一定范围内，复合驱油剂中表面活性剂和碱含量的增加有利于乳液乳化程度的提高。
