一种抗盐性表面活性剂驱油体系的室内筛选及评价
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1.四川光亚聚合物有限公司;2.西南石油大学;3.延长油田股份有限公司杏子川采油厂

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Laboratory Screening and Evaluation of Surfactant Flooding System with Salt Resistance
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    摘要:

    针对延长化182井组长6油层在实际采油开发过程中注采比不理想以及开发井低产、低能,地层水矿化度和钙镁离子高导致常规表面活性剂失效等问题,研究一种抗盐性表面活性剂驱油剂,该剂在不用螯合剂和稳定剂的条件下,采用PPM-12、AES-12(十二烷基聚氧乙烯醚硫酸钠)与OB-2(十二烷基二甲基氧化胺)复配而制得。筛选最适宜的表面活性剂总浓度0.3wt%,较适宜的配比范围为4:1:1-1:1:4,油水界面张力均能达到超低,确定最佳配比是2:1:3,此时油水界面张力能达到最低值(0.0012 mN?m-1)。在最佳配比且总浓度为0.3wt%条件下进行了吸附实验、乳化实验和抗盐实验,结果表明:体系六次吸附后油水界面张力仍在10-3mN?m-1数量级;体系乳化分水时间达2894s,且油水界面清楚;体系在油田钙镁离子范围内达能到10-3 mN?m-1数量级,镁离子对体系界面张力影响最大,其次为钙离子,钠离子影响最小。实验表明PPM-12、AES-12和OB-2复配体系适合于延长化182井组长6油层提高采收率,其平均提高采收率达10.3%,在类似高盐低渗油藏具有良好的应用前景。

    Abstract:

    Aiming at the problems of unsatisfactory injection production ratio in the actual oil production and development process of Yanhua 182 Well Group, low production and low energy of development wells, high salinity, high calcium and magnesium ions in formation water resulting in the failure of conventional surfactant, a system of surfactant flooding with anti-salt was prepared. Without chelating agent and stabilizer, the system of surfactant flooding consisted of PPM-12(bis{[(N-methylN-(3- dodecanoxy-2-hydroxyl) propyl-N-(2-hydroxyl-3-sulfonic acid sodium) propyl] methylene} ammonium chlorides),AES-12 (sodium lauryl ether sulfate) and OB-2 (dodecyl dimethylamine oxide). The optimum total concentration of surfactant flooding system was 0.3wt%, and the suitable weight ratio range was 4:1:1-1:1:4. The optimum ratio is 2:1:3, and the oil-water interfacial tension can reach the lowest value (0.0012 mN.m-1). The adsorption, emulsification, salt resistance of the composite surfactant flooding system was studied under optimum conditions. The results of adsorption performance showed that the system was still in the order of 10-3 mN.m-1 after six adsorption. The results of emulsification showed that the water separation time of the system was 3995s. The experimental results of resistance to sodium, calcium and magnisesium ions showed that the system could reach the order of 10-3 mN. m-1 in the range of sodium, calcium and magnesium ions in the oilfield. Magnesium ions have the greatest influence on the interfacial tension of the system, followed by calcium ions and sodium ions. Experiments show that the PPM-12, AES-12 and OB-2 compound system is suitable for EOR of Chang 6 reservoir of Hua 182 well groups, with an average EOR of 10.3%. It has a good application prospect in similar high salt and low permeability reservoirs.

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  • 收稿日期: 2021-09-05
  • 最后修改日期: 2021-10-09
  • 录用日期: 2021-10-09
  • 在线发布日期: 2022-12-20
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