Meng Xianxing, Zhang Guiqing, Wu Jian, Zhao Xiong, Wang Lin, Zhang Fang
School of Chemistry and Chemical Engineering, Ankang University, Ankang 725000, China.
Ankang Research Centre of New Nano-Materials Science and Technology, Ankang University, Ankang 725000, China.
Polymers (Basel). 2022 Aug 3;14(15):3159. doi: 10.3390/polym14153159.
To improve the dispersion stability of phenol-formaldehyde resin (PFR) particles in simulated oilfield injection water and their propagation ability in petroleum reservoir, a hydrophobically associating polymer (HAP) was employed as a stabilizer in this paper. The dispersion stability of PFR in the injection water was studied by measuring turbidity as a function of time. In addition, the migration property of the PFR/HAP dispersion was evaluated by both cellulose membrane filtration and sand packs-flooding experiments. The results show that HAP can stabilize the PFR dispersion prepared with the simulated injection water by forming PFR/HAP complex molecular aggregates. These aggregates can migrate in sand packs with strong flow resistance due to deformation or disaggregation of the aggregates when passing through the pore throat. Oil recovery was improved by up to 21.1% on the basis of water flooding, and the higher the concentration of PFR/HAP dispersion system, the better the oil recovery effect. Moreover, the cycle of log-jamming/dispersion of the aggregates leads to their penetrations through the bigger pores in the sand packs with a higher flow resistance than water. This process can improve the conformance of water in high permeability sand packs on a micro/macro scale and thus divert more water into low permeability sand packs. Therefore, more oil could be recovered from the low permeability sand packs. Moreover, the bigger the sand pack's permeability ratio, the lower the oil recovery rate by waterflood, and the more the incremental oil can be recovered by the PFR/HAP flood.
为提高酚醛树脂（PFR）颗粒在模拟油田注入水中的分散稳定性及其在油藏中的运移能力，本文采用一种疏水缔合聚合物（HAP）作为稳定剂。通过测量浊度随时间的变化来研究PFR在注入水中的分散稳定性。此外，通过纤维素膜过滤和砂充填驱油实验对PFR/HAP分散体系的运移性能进行了评价。结果表明，HAP能通过形成PFR/HAP复合分子聚集体来稳定用模拟注入水制备的PFR分散体系。这些聚集体在通过孔喉时由于聚集体的变形或解聚而能在具有强流动阻力的砂充填中运移。在水驱基础上，原油采收率提高了21.1%，且PFR/HAP分散体系浓度越高，原油采收效果越好。此外，聚集体的堵塞/分散循环导致它们穿过砂充填中比水具有更高流动阻力的较大孔隙。这一过程可以在微观/宏观尺度上提高高渗透砂充填中水的波及系数，从而使更多的水转向低渗透砂充填。因此，可以从低渗透砂充填中采出更多的原油。而且，砂充填的渗透率比值越大，水驱采收率越低，PFR/HAP驱油可采出的增量油越多。
