Displacement Characters of Combination Flooding Systems consisting of Gemini-Nonionic Mixed Surfactant and Hydrophobically Associating Polyacrylamide for Bohai Offshore Oilfield
Displacement Characters of Combination Flooding Systems consisting of Gemini-Nonionic Mixed Surfactant and Hydrophobically Associating Polyacrylamide for Bohai Offshore Oilfield
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DOI：
10.1021/ef3002185
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发表时间：
2012-05-01
期刊：
影响因子：
5.3
通讯作者：
Luo Ping-ya
中科院分区：
文献类型：
--
作者：
Liu Jian-xin;Guo Yong-jun;Luo Ping-ya
本文研究了由双子-非离子混合表面活性剂和疏水缔合聚丙烯酰胺（HAPAM）组成的新型聚合物表面活性剂（SP）驱油体系在渤海油田油藏条件下的注入能力和驱油特性。注入测试表明，SP系统可以建立更高的阻力因子（RF）和残余阻力因子（RRF），以扩大非非均质油藏的波及效率。总共进行了 10 次岩心驱油试验，以研究非均质性、段塞成分和聚合物分子结构的影响。结果表明，与水驱和聚合物驱相比，该体系由于具有更高的粘度和超低的界面张力（IFT）而可以获得更高的采收率。该段塞组合物由0.175%的聚合物和0.3%的混合表面活性剂组成，以Gemini表面活性剂与非离子表面活性剂的比例为4:1形成复合物，可以经济地充分发挥粘度和IFT。此外，我们发现，由于粘弹性流变性，采用 HAPAM 的 SP 系统比未改性的系统可以获得更高的石油采收率 6-13% 的原始石油地质储量 (OOIP)。实验室岩心试验为该SP系统在渤海油田的大规模应用提供了可靠的证明。
In this paper, the injectivity and displacement characters of a new polymer-surfactant (SP) flooding system consisting of gemini-nonionic mixed surfactant and hydrophobically associating polyacrylamide (HAPAM) have been studied under Bohai offshore oilfield reservoir conditions. The injectivity tests have shown that the SP system could build higher resistance factor (RF) and residual resistance factor (RRF) to expand sweep efficiency in nonheterogeneous reservoirs. A total of 10 core flooding tests were carried out to investigate the effect of heterogeneity, slug composition, and polymer molecular structure. The results have shown that the system could obtain higher recovery owing to higher viscosity and ultralow interfacial tension (IFT) compare to water flooding and polymer flooding. The slug composition, with 0.175% polymer and 0.3% mixed surfactant, which forms a composite with the ratio of 4:1 gemini surfactant to nonionic surfactant, could allow full play to viscosity and IFT economically. Moreover, we found that the SP system with HAPAM could obtain a higher oil recovery by 6-13% original oil in place (OOIP) than a nonmodified one, as a result of viscoelastic rheology. The laboratory core tests provided credible proofs for large scale application with this SP system in Bohai offshore oilfield.