Dialkyl hydroxypropyl sulfobetaine (HSB) surfactants, C₁₆GA-(PO)₅-(EO)₃-HSB and C₂₄GA-(PO)₁₀-(EO)₁₀-HSB, were synthesized from Guerbet alcohols (GA) polyoxypropylene–polyoxyethylene (PO-EO) ethers and their behaviors in surfactant-polymer (SP) flooding of high temperature and high salinity reservoirs were examined and compared with their anionic hydroxypropyl sulfonate (HS) counterparts, C₁₆GA-(PO)₅-(EO)₃-HS and C₂₄GA-(PO)₁₀-(EO)₁₀-HS. The PO-EO chain embedded improves their aqueous solubility, and the sulfobetaines show better salt resistance than sulfonates. For a reservoir condition of total salinity 19,640 mg L⁻¹ and 60–80°C, C₁₆GA-(PO)₅-(EO)₃-HSB alone can reduce crude oil/connate water interfacial tension (IFT) to ultralow at 0.25–5 mM, which can be further widened to 0.1–5 mM by mixing with dodecylhexyl (C₁₂₊₆) glyceryl ether hydroxypropyl sulfobetaine (C₁₂₊₆GE-HSB), a slightly hydrophobic surfactant. C₂₄GA-(PO)₁₀-(EO)₁₀-HSB is more hydrophobic for the specified reservoir condition, however, by mixing with hexadecyl dimethyl hydroxypropyl sulfobetaine (C₁₆HSB), a hydrophilic surfactant, ultralow IFT can also be achieved at a total concentration of 0.25–5 mM. The anionic counterparts can also reduce IFT to ultralow by mixing with C₁₂₊₆GE-HSB and C₁₆HSB, respectively. Moreover, the optimum binary mixture, C₁₆GA-(PO)₅-(EO)₃-HSB/C₁₂₊₆GE-HSB at a molar fraction ratio of 0.6/0.4, can keep the negatively charged solid surface water-wet (θ_w = 12–23°) in a wide concentration range, and can still achieve ultralow IFT after stored at 90°C for 90 days (initially 5 mM), which overall are favor of improving oil displacement efficiency at high temperature and high salinity reservoir conditions.

中文翻译：

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衍生自Guerbet醇聚氧丙烯-聚氧乙烯醚的二烷基磺基甜菜碱表面活性剂，用于高温高盐度储层的SP驱油

由Guerbet醇（GA）聚氧丙烯合成了二烷基羟丙基磺基甜菜碱（HSB）表面活性剂C ₁₆ GA-（PO）_5-（EO）₃ -HSB和C ₂₄ GA-（PO）_10-（EO）₁₀ -HSB –研究了聚氧乙烯（PO-EO）醚及其在高温和高盐度油藏中的表面活性剂-聚合物（SP）驱替中的行为，并将其与阴离子羟丙基磺酸盐（HS）对应物C ₁₆ GA-（PO）_5-（EO ）₃ -HS和C ₂₄ GA-（PO）_10-（EO）₁₀-HS。嵌入的PO-EO链改善了其水溶性，并且磺基甜菜碱的耐盐性比磺酸盐好。对于总盐度为19,640 mg L ^-1和60–80°C的油藏条件，单独使用C ₁₆ GA-（PO）_5-（EO）₃ -HSB可以将原油/自来水界面张力（IFT）降低至0.25-5 mM，可以通过与略有疏水性的表面活性剂_十二烷基己基（C _{12 + 6}）甘油醚羟丙基磺基甜菜碱（C _{12 + 6} GE-HSB）混合，进一步扩展至0.1-5 mM 。C ₂₄ GA-（PO）_10-（EO）₁₀-HSB在指定的储层条件下更具疏水性，但是，通过与十六烷基二甲基羟丙基磺基甜菜碱（C ₁₆ HSB）混合，一种亲水性表面活性剂，也可以以0.25-5 mM的总浓度实现超低IFT。阴离子对应物也可以分别与C _{12 + 6} GE-HSB和C ₁₆ HSB混合，将IFT降低至超低水平。此外，最佳二元混合物C ₁₆ GA-（PO）_5-（EO）₃ -HSB / C _{12 + 6} GE-HSB的摩尔分数比为0.6 / 0.4，可以使带负电荷的固体表面保持水湿性（θ_瓦特 = 12–23°）在较宽的浓度范围内，并且在90°C下存储90天（最初为5 mM）后仍可实现超低IFT，总体上有利于提高高温和高盐度油藏条件下的驱油效率。