低渗油藏用聚合物微球/表面活性剂复合调驱体系

Polymer Microsphere/Surfactant Compound Flooding System in Low Permeability Reservoir

针对低渗油藏多发育微裂缝、非均质性严重、水窜严重,常规调驱技术难以发挥有效作用的难题,对实验室自制的聚合物微球(聚丙酰胺类微球)/表面活性剂(烷醇酰胺型表面活性剂)复合调驱体系展开研究。在复合调驱体系配伍性评价的基础上,优化了复合调驱各段塞的注入参数,评价了复合调驱体系的驱油性能。结果表明:聚合物微球与表面活性剂具有良好配伍性,最优的复合注入体系为0.4 PV聚合物微球溶液(2000 mg/L)+0.3 PV表面活性剂溶液(2000 mg/L),在水驱基础上平均提高采收率幅度达15%以上。聚合物微球/表面活性剂复合调驱技术在裂缝性低渗油藏中具较强适应性。

Aiming at the problem of numerous microcracks,serious heterogeneity and water channeling in low permeability reservoir,and that conventional flooding technology was difficult to play an effective role in the reservoir,experiment study on polymer microsphere(polyacrylamide microsphere)/surfactant(alkanolamide surfactant)compound flooding system was carried out,compatibility of the compounding flooding system was evaluated firstly,then the injection parameter and oil displacement performance were optimized and evaluated. The results showed that polymer microsphere and surfactant were compatible,and the optimal composite injection system was as follows: 0.4 PV polymer microspheres solution(2000 mg/L)+0.3 PV surfactant solution(2000 mg/L),and the composite system could improve the recovery efficiency by above 15% based on the water flooding. Polymer microspheres/surfactant compound flooding control technology was well suitable for low permeability fractured reservoirs.