Wu Mingxuan, Li Binfei, Ruan Liwei, Tang Yongqiang, Li Zhaomin
Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Polymers (Basel). 2024 Aug 30;16(17):2478. doi: 10.3390/polym16172478.
This study investigated the enhancing effects of the temperature-resistant polymer Poly(ethylene-co-N-methylbutenoyl carboxylate-co-styrenesulfonate-co-pyrrolidone) (hereinafter referred to as Z364) on the performance of cocamidopropyl hydroxy sulfobetaine (CHSB) foam under high-temperature and high-salinity conditions. The potential of this enhanced foam system for mobility control during heavy oil thermal recovery processes was also evaluated. Through a series of experiments, including foam stability tests, surface tension measurements, rheological assessments, and parallel core flooding experiments, we systematically analyzed the interaction between the Z364 polymer and CHSB surfactant on foam performance. The results indicated that the addition of Z364 significantly improved the strength, thermal resistance, and salt tolerance of CHSB foam. Furthermore, the adsorption of CHSB on the polymer chains enhanced the salt resistance of the polymer itself, particularly demonstrating stronger blocking effects in high-permeability cores. The experimental findings showed that Z364 increased the viscosity of the liquid film, slowed down liquid drainage, and reduced gas diffusion, effectively extending the half-life of CHSB foam and improving its stability under high-temperature conditions. Additionally, in parallel core flooding experiments, the polymer-enhanced foam exhibited significant flow diversion effects in both high-permeability and low-permeability cores, effectively directing more fluid into low-permeability channels and improving fluid distribution in heterogeneous reservoirs. Overall, Z364 polymer-enhanced CHSB foam demonstrated superior mobility control during heavy oil thermal recovery, offering new technical insights for improving the development efficiency of high-temperature, high-salinity reservoirs.
本研究考察了耐高温聚合物聚（乙烯 - 共 - N - 甲基丁烯酰基羧酸盐 - 共 - 苯乙烯磺酸盐 - 共 - 吡咯烷酮）（以下简称Z364）对椰油酰胺丙基羟基磺基甜菜碱（CHSB）泡沫在高温高盐条件下性能的增强作用。还评估了这种增强泡沫体系在稠油热采过程中用于控制流度的潜力。通过一系列实验，包括泡沫稳定性测试、表面张力测量、流变学评估和平行岩心驱替实验，我们系统地分析了Z364聚合物与CHSB表面活性剂之间对泡沫性能的相互作用。结果表明，添加Z364显著提高了CHSB泡沫的强度、耐热性和耐盐性。此外，CHSB在聚合物链上的吸附增强了聚合物本身的耐盐性，特别是在高渗透岩心中表现出更强的封堵作用。实验结果表明，Z364增加了液膜的粘度，减缓了液体排液，并减少了气体扩散，有效地延长了CHSB泡沫的半衰期并提高了其在高温条件下的稳定性。此外，在平行岩心驱替实验中，聚合物增强泡沫在高渗透和低渗透岩心中均表现出显著的分流作用，有效地将更多流体导向低渗透通道并改善了非均质油藏中的流体分布。总体而言，Z364聚合物增强的CHSB泡沫在稠油热采过程中表现出优异的流度控制能力，为提高高温高盐油藏的开发效率提供了新的技术见解。
