| 摘要: |
| 目的 针对常规化学驱体系,聚合物耐剪切性能不佳,地层深部黏度保留率受影响的问题,进行蠕虫状胶束驱油技术研究。方法 利用甜菜碱表面活性剂单体(PSM)、N,N-二甲基丙二胺等原料,采用酰胺化和季铵化两步反应的合成方式,减压条件下少量多次旋干,合成了具有黏弹性和界面活性的驱油用蠕虫状胶束表面活性剂,考查了蠕虫状胶束的分子结构、流变特性、微观结构、抗剪切性能、耐盐性能、界面张力和驱油特性。结果 通过核磁谱获得的结构与目标产物一致。蠕虫状胶束在渤海模拟盐水中具有较好的增黏性(质量分数为0.30%～0.50%时,表观黏度10～50 mPa·s,7.34 s-1)、耐盐性(<100 000 mg/L)及降低油水界面张力的能力(10-2 mN/m)。岩心驱替实验结果表明,蠕虫状胶束比常规聚合物具有更强的驱油能力,采收率增加11.7%。现场单井组试验增油2 700 m3。结论 蠕虫状胶束驱油技术在海上高含水油藏中,可作为一种高效驱油剂有效发挥增油降水作用。 |
| 关键词: 蠕虫状胶束 驱油 黏弹性 表面活性剂 界面张力 |
| DOI：10.3969/j.issn.1007-3426.2023.01.014 |
| 分类号: |
| 基金项目:国家科技重大专项“渤海油田高含水水平井自控选择性堵水技术研究与示范”(2016ZX05058)；中海油“在线调剖技术研发与应用”(E-23217001) |
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| Research and application of wormlike micelle oil displacement technology in offshore high water-cut oilfield |
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Yu Meng1, Li Xiang1, Liu Wenhui1, Tie Leilei1, Wu Bao1, Xu Guorui1, Li Xuefeng2
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1. Oilfield Production Division, China Oilfield Services Limited, Tianjin, China ;2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei, China
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| Abstract: |
| Objective Aiming at the problems of poor shear resistance of polymer and the influence of deep formation viscosity retention in conventional chemical flooding system, wormlike micelle oil displacement technology was studied. Methods Using betaine surfactant monomer (PSM), N, N-dimethylpropylene diamine and other raw materials, by two-step reaction of amidation and quaternization, the wormlike micellar surfactant for oil displacement with viscoelasticity and interfacial activity was synthesized under the conditon of reduced pressure spin drying. The molecular structure, rheological properties, microstructure, shear resistance, salt resistance, interfacial tension and oil displacement characteristics of wormlike micelle were investigated. Results The structure obtained by NMR was consistent with the target product. Wormlike micelle has good viscosity increasing (mass fraction 0.30%-0.50%, apparent viscosity 10-50 mPa·s, 7.34 s-1), salt resistance (<100 000 mg/L) and the ability to reduce oil-water interfacial tension (10-2 mN/m). The core displacement experiment results showed that the wormlike micelle has stronger oil displacement ability than conventional polymer, and the EOR was increased by 11.7%. Field well group test increased oil by 2 700 m3. Conclusion s Wormlike micelle oil displacement technology can be used as an efficient oil displacement agent in offshore high water-cut reservoirs to effectively increase oil rate and reduce water production. |
| Key words: wormlike micelle oil displacement viscoelasticity surfactant interfacial tension |
