| 摘要: |
| 三元复合驱中聚合物、碱以及表面活性剂的协同作用能够大幅提高原油采收率,各组分存在的色谱分离会使协同作用大为减弱。通过一维长岩心研究二元/三元体系各组分在线性流过程中吸附规律差异,然后制作二维平面物理模型研究三元复合驱径向流过程中各组分运移规律,判断出三者的协同作用距离,通过数值模拟以及矿场试验结果论证用变浓度多段塞代替单一段塞的可行性。研究表明:三元体系中由于碱的存在可以使超低界面张力保持距离和乳化能力强于二元体系,三元体系一维长岩心的采出程度比二元体系增加了6.32％;三元体系各组分协同作用距离集中在主流线1/2处,各组分运移距离为:聚合物>碱>表面活性剂,在后续水驱的过程中表面活性剂存在解吸附现象;使用变浓度多段塞组合注入,可以在保持相近采收率情况下减少15％的表面活性剂和4.5％的聚合物用量。 |
| 关键词: 三元复合驱 色谱分离 协同距离 乳化 多段塞 |
| DOI：10.3969/j.issn.1673-5005.2016.06.015 |
| 分类号::TE 357 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(51374221);中国石油大学优秀博士学位论文基金项目(01JB0585) |
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| Synergy effects of different components during ASP flooding |
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LIU Zheyu1, LI Yiqiang1, WANG Xiaoguang2, LOU Rengui2, YU Zhaoyan1, TIAN Kun1
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(1.Enhanced Oil Recovery Institute in China University of Petroleum, Beijing 102249, China;2.Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)
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| Abstract: |
| The synergy effect of polymer, alkali and surfactant in ASP flooding can enhance oil recovery significantly. However, the synergy effect will be receded due to chromatographic separation. The differences of adsorption process in liner flow for different components in SP/ASP systems were investigated using the one-dimensional long core model. And the two-dimensional physical model was made to study the radial flow regularity of each component during ASP flood. Then, the synergy distance of three components was determined. And the feasibility of using the variable concentration multi-slug to replace the single slug was studied by the numerical simulation and the pilot result. It is found that the distance of ultra-interfacial tension and the stability of emulsion during ASP flood are better than SP flood due to the alkali. The displacement efficient of ASP flooding is 6.32％ higher than that of SP flooding in one-dimensional long core flood experiments. Also, the ASP synergy distance is within the half of main streamline, and the removed distance of these components is:polymer>alkali>surfactant. The desorption can be observed when water is injected after ASP flooding. And the amount of surfactant and polymer can be greatly reduced down to 15％ and 4.5％ respectively by using variable concentration multi-slug in the case of keeping similar recovery. |
| Key words: ASP flooding chromatographic separation synergy distance emulsion multi-slug |
