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表面活性剂-聚合物二元复合驱油体系性能研究 被引量:7

Study on the performance of surfactant-polymer combination flooding
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摘要 表面活性剂DWS与大庆原油形成超低油水界面张力,矿化度对油水界面张力的影响不明显;表面活性剂不影响聚丙烯酰胺的增黏性能,与聚合物配伍性好,但在油砂上的吸附量相对较大。在低渗透天然岩心上,水驱后二元复合驱平均提高采收率12.0%。在近似黏度和界面张力条件下,三元复合体系比二元复合体系多提高采收率3~5个百分点,但三元复合体系比二元体系的化学剂成本高。亲水亲油平衡是无碱表面活性剂形成超低界面张力的机理,疏水碳链长,相对分子质量大是无碱表面活性剂的一个特征。合成无碱表面活性剂的方向包括选用更长的单一疏水碳链,或合成含两个疏水碳链的双子表面活性剂。 Super-low interfacial tension can be attained between surfactant DWS and Daqing oil without base. The TDS has no obvious effect on interfacial tension. There exists good compatibility between polyacrylamide and surfactant, but the static adsorption of surfactant on oil sands is higher than that of heavy alkyl benzene sulfonate in ASP. Surfactant-polymer combination flooding could enhance oil recovery by 12.0 % in natural core with low permeability after water flooding. At the same viscosity and interfacial tension, the EOR of ASP flooding is higher by 3 %-5 % than that of SP flooding, accompanied with higher chemical cost of ASP. Hydrophilic-lipophilic balance is the mechanism of super-low interfacial tension for alkali free surfactant. Alkali free surfactant has long hydrophobic carbon chain and high molecular weight. Increasing the hydrophobicity of surfactant is a direction gaining super-low interfacial tension. The routes of synthetising alkali free surfactant include increasing the length of hydrophobic carbon chain, synthetising Gemini surfactant.
作者 刘翎 LIU Ling(Oil and Gas Engineering Division of PetroChina Liaohe Petroleum Exploitation Bureau, Panjin Liaoning 124010, China)
出处 《石油化工应用》 CAS 2018年第6期13-20,共8页 Petrochemical Industry Application
基金 国家自然科学基金项目资助 项目编号:51174041
关键词 表面活性剂 超低界面张力 化学驱 提高采收率 suffactant super-low inteffacial tension chemical flooding enhanced oil recovery
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