Mixtures of anionic/cationic surfactants have never been used in enhanced oil recovery (EOR) for negatively charged sandstone reservoirs because of high adsorption. Recently, novel mixtures of anionic/cationic surfactants that produced low critical micelle concentrations (CMCs) of 3.50×10^–4 wt%, ultralow interfacial tension (IFT) of 10^–4 mN/m, high oil solubilization of 23, and low adsorption of 0.27 mg/g sand were developed in the laboratory for a mature sandstone reservoir with characteristics of high temperature of 81°C, high water cut of 97.8%, high recovery factor of 53.3%, and low-acid oil of 0.021 mg/g potassium hydroxide (KOH). Coreflooding results indicated that alkali/surfactant/polymer (ASP) flooding with a preslug of crosslinked polymer (CP) increased oil recovery by 24.2% of original oil in place (OOIP) over the waterflood under the optimal chemical formulation.

Since January 2012, the first field application of ASP flooding in the world with highly efficient mixtures of anionic/cationic surfactants was performed for a high-temperature, high-water-cut mature sandstone reservoir to demonstrate the potential of the novel surfactant to recover residual oil from as high as 53.3% recovery factor of reserves. ASP slug and CP slug for conformance control were alternately injected. The water cut decreased from 97.9 to 90.2% and the estimated ultimate oil recovery can be increased by 14.2% of OOIP and yield up to 67.5% of OOIP.

阴离子/阳离子表面活性剂的混合物由于具有高吸附性，因此从未用于带负电的砂岩油藏提高采收率（EOR）。最近，产生了3.50×10低临界胶束浓度（CMC）具有的阴离子/阳离子表面活性剂新混合物^-4％（重量），超低的10界面张力（IFT）^-4mN / m是实验室开发的一种成熟的砂岩油藏，其特征是高温为81°C，高含水率为97.8％，回收率高，在实验室中开发出mN / m，高油溶性23和低吸附0.27 mg / g砂子。 53.3％，以及0.021 mg / g氢氧化钾（KOH）的低酸油。岩心驱油结果表明，在最佳化学配方下，碱水/表面活性剂/聚合物（ASP）的预交联聚合物（CP）驱油使注水量比注水量提高了原始注油量（OOIP）的24.2％。

自2012年1月以来，在高温，高含水率的成熟砂岩油藏中进行了世界上首次将阴离子/阳离子表面活性剂的高效混合物进行ASP驱的现场试验，以证明新型表面活性剂具有回收残余物的潜力。石油的回收率高达53.3％。交替注入用于一致性控制的ASP塞和CP塞。含水率从97.9％降低到90.2％，估计的最终采油量可以提高OOIP的14.2％，最多可以提高OOIP的67.5％。