Numerical study for continuous surfactant flooding considering adsorption in heterogeneous reservoir
表面活性剂驱油是一种已被验证的提高采收率（EOR）技术。表面活性剂提高采收率的机理是通过降低油水之间的界面张力来改变流体/流体的相互作用，通过改变多孔介质的润湿性来改变流体/岩石的性质。表面活性剂驱油已应用于多个现场试验项目。本研究主要针对苏丹本丢（Bentiu）油藏进行表面活性剂连续驱油研究。
本研究中使用的主要方法是使用STARS软件对组分流动进行数值分析，提出用于连续驱油的新型表面活性剂。此外，还研究了表面活性剂提高采收率的能力，并与传统的水驱采油方法进行了比较。此外，为了提高研究准确性，还研究了典型非均质油田中表面活性剂吸附的风险。采用表面张力法，通过静态间歇吸附试验计算表面活性剂的吸附量。模拟结果表明，新研制的表面活性剂使原油总采收率提高了70%。与常规水驱相比，表面活性剂驱表现出较低的含水率。
Abstract
Surfactant flooding is a proven Enhanced Oil Recovery (EOR) technique used for mobilizing residual oil trapped in the reservoir. The mechanism of surfactant injection into reservoirs for improving oil recovery factor is to alter the fluid/fluid interaction by reducing interfacial tension between oil and brine. Besides, they alter fluid/rock properties via wettability alteration of the porous medium. Surfactant flooding has been applied on several field pilot projects. This research mainly focuses on investigating the continuous surfactant flooding for Bentiu oil reservoir in Sudan. The main method used in this study is numerical analysis of compositional flow using STARS software provided by the Computer Modelling Group Company (CMG-STARS). The research also proposed new surfactant for the continuous flooding. Moreover, the surfactant ability to increase the recovery factor was studied and compared to the traditional water flooding recovery method. Furthermore, for accuracy purposes, the risk of surfactant adsorption in the typical heterogeneous field was studied. The surfactant adsorption was calculated from static batch adsorption test by the surface tension method. The simulation results showed that the newly proposed surfactant improved total oil recovery by 70%. The surfactant flooding showed lower water cut when compared to conventional water flooding. The improvement in the oil recovery and water cut was a good indication for the suitability of surfactant flood in the heterogeneous reservoir.
学习学习