Wang Junqi, Liu Ruiqing, Wang Bo, Cheng Zhigang, Liu Chengkun, Tang Yiwen, Zhu Junfeng
The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province, Xi'an Shiyou University, Xi'an 710065, China.
Shaanxi Key Research Laboratory of Chemical Additives, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Polymers (Basel). 2023 Jul 24;15(14):3139. doi: 10.3390/polym15143139.
Heavy oil exploitation needs efficient viscosity reducers to reduce viscosity, and polyether carboxylate viscosity reducers have a significant viscosity reduction effect on heavy oil. Previous work has studied the effect of different side chain lengths on this viscosity reducer, and now a series of polyether carboxylate viscosity reducers, including APAD, APASD, APAS, APA, and AP5AD (the name of the viscosity reducer is determined by the name of the desired monomer), with different electrical properties have been synthesized to investigate the effect of their different electrical properties on viscosity reduction performance. Through the performance tests of surface tension, contact angle, emulsification, viscosity reduction, and foaming, it was found that APAD viscosity reducers had the best viscosity reduction performance, reducing the viscosity of heavy oil to 81 mPa·s with a viscosity reduction rate of 98.34%, and the worst viscosity reduction rate of other viscosity reducers also reached 97%. Additionally, APAD viscosity reducers have the highest emulsification rate, and the emulsion formed with heavy oil is also the most stable. The net charge of APAD was calculated from the molar ratio of the monomers and the total mass to minimize the net charge. While the net charge of other surfactants was higher. It shows that the amount of the surfactant's net charge affects the surfactant's viscosity reduction effect, and the smaller the net charge of the surfactant itself, the better the viscosity reduction effect.
稠油开采需要高效降黏剂来降低黏度，聚醚羧酸盐降黏剂对稠油具有显著的降黏效果。以往的工作研究了不同侧链长度对这种降黏剂的影响，现在已经合成了一系列具有不同电学性质的聚醚羧酸盐降黏剂，包括APAD、APASD、APAS、APA和AP5AD（降黏剂的名称由所需单体的名称决定），以研究它们不同的电学性质对降黏性能的影响。通过表面张力、接触角、乳化、降黏和发泡等性能测试发现，APAD降黏剂具有最佳的降黏性能，能将稠油黏度降至81 mPa·s，降黏率为98.34%，其他降黏剂的最差降黏率也达到了97%。此外，APAD降黏剂具有最高的乳化率，与稠油形成的乳液也最稳定。根据单体的摩尔比和总质量计算出APAD的净电荷，使其净电荷最小化。而其他表面活性剂的净电荷较高。这表明表面活性剂的净电荷量会影响其降黏效果，表面活性剂本身的净电荷越小，降黏效果越好。
