弱碱三元复合驱与强碱三元复合驱的对比

A Correlation of Weak and Strong Base ASP Flooding Processes

三元复合驱即将成为大庆油田的主导开发技术,为了推荐出合适的三元复合驱类型,对比研究了弱碱三元复合驱与强碱三元复合驱。研究表明,弱碱三元复合驱可以比水驱提高采收率20%以上,与强碱三元复合驱相当;弱碱三元复合驱与强碱三元复合驱乳化液粘度都超过100 mPa.s,两种类型三元复合乳化能力相差不多,甚至弱碱三元复合驱乳化能力还略强一些;在注采能力、采油速度方面,弱碱三元复合驱甚至高于强碱三元复合驱;特别是在结垢程度上,弱碱三元复合驱比强碱三元复合驱弱,对生产井的影响较小。因此,在三元复合驱推广应用时应当选用弱碱三元复合驱。

The alkali-surfactant-polymer （ASP） flooding is becoming the dominant recovery technology in Daqing oilfield. In order to recommend the feasible type of ASP flooding, the ASP flooding with weak base is compared with the ASP flooding with strong base. The results show that the oil recovery by the weak-base ASP flooding process is over 20% higher than water flooding process, which is comparable with that by the strong-base ASP flooding one. Both of ASP flooding processes have the same emulsion viscosity of over 100 mPa.s, but the emulsification of weak-base one is a little better than that of strong-base one. In addition, the former has the advantage of the latter in the injection-production capacity and recovery rate. In particular, the scaling tendency of the former is weaker than that of the latter, with little effect on production wells. Therefore, the ASP flooding with weak base should be selected as a candidate for the process in expanding application.