Novriansyah Adi, Bae Wisup, Park Changhyup, Permadi Asep K, Sri Riswati Shabrina
Department of Energy and Mineral Resources Engineering, Sejong University, Seoul 05006, Korea.
Department of Energy and Resources Engineering, Kangwon National University, Chuncheon, Kangwon 24341, Korea.
Polymers (Basel). 2020 Mar 9;12(3):626. doi: 10.3390/polym12030626.
This paper presents an optimal design of alkaline-surfactant-polymer (ASP) flooding and an experimental analysis on the effects of ASP components under low formation salinity, where the assignment of salinity gradients and various phase types are limited. The phase behavior and coreflooding tests confirmed the ASP formula is optimal, i.e., 1 wt % sodium carbonate (NaCO) as the alkaline, 1:4 eight ratio for linear alkylbenzene sulfonate (LAS) and dioctyl sulfosuccinate (DOSS) as a surfactant, 5 wt % diethylene glycol monobutyl ether (DGBE) as a co-solvent, and hydrolyzed polyacrylamide (HPAM) as a polymer. The salinity scan was used to determine that the optimum salinity was around 1.25 wt % NaCl and its solubilization ratio was favorable, i.e., approximately 21 mL/mL. The filtration ratio determines the polymer concentrations, i.e., 3000 or 3300 mg/L, with a reduced risk of plugging through pore throats. The coreflooding test confirmed the field applicability of the proposed ASP formula with an 86.2% recovery rate of residual oil after extensive waterflooding. The optimal design for ASP flooding successfully generated phase types through the modification of salinity and can be applicable to the low-salinity environment.
本文提出了一种碱性-表面活性剂-聚合物（ASP）驱油的优化设计，并对低地层盐度下ASP各组分的影响进行了实验分析，其中盐度梯度的分配和各种相类型受到限制。相行为和岩心驱替试验证实了ASP配方是最优的，即1 wt%碳酸钠（NaCO）作为碱剂，线性烷基苯磺酸钠（LAS）与磺基琥珀酸二辛酯（DOSS）的比例为1:4作为表面活性剂，5 wt%二乙二醇单丁醚（DGBE）作为助溶剂，水解聚丙烯酰胺（HPAM）作为聚合物。通过盐度扫描确定最佳盐度约为NaCl的1.25 wt%，其增溶比良好，即约为21 mL/mL。过滤比决定了聚合物浓度，即3000或3300 mg/L，降低了通过孔喉堵塞的风险。岩心驱替试验证实了所提出的ASP配方在现场的适用性，在广泛水驱后残余油采收率为86.2%。ASP驱油的优化设计通过盐度改性成功生成了相类型，可应用于低盐度环境。
