一种聚合物纳米微球调驱剂的制备及性能评价

Preparation and Performance Evaluation of Nano-Microsphere Oil Displacement Agent Suitable to Offshore Heavy Oil Field

针对延长油田某油田储层非均质性强、窜流通道普遍分布、注入水低效或无效循环、水驱波及体系小的特点,研制了一种适应于低渗油藏的纳米微球调驱剂WQ‐3,通过室内实验评价了其微观形貌、膨胀性能、黏弹性能以及耐剪切性能,并借助岩心流动实验评价了该调驱剂在非均质岩心中的调驱性能。结果表明,纳米微球WQ‐3为圆度很好的球形纳米颗粒,平均粒径为404.92nm,在80℃、模拟地层水中,纳米微球调驱剂吸水24h后的膨胀倍数为34.96g/g。纳米微球WQ‐3吸水后具有明显的黏弹性能,表现出软固体的性质,在高剪切速率下,纳米微球WQ‐3体系具有较好的耐剪切能力;非均质岩心注入纳米微球WQ‐3体系后,注入压力上升迅速,采收率增加高达14.25%。

Aiming at the reservoir characteristics of strong reservoir heterogeneity,circulation way widely distributed and poor water flooding effect in X oilfield of yanchang,a kind of nano‐microsphere oil displacement agent WQ‐3 was systhesized.The microstructure,swelling property,viscoelasticity and shear resistance performance were evaluated through the indoor experiments.The core‐flow experiment was used to evaluate the performance of the regulator in heterogeneous core.The results showed that nano‐microsphere WQ‐3 are spherical nanoparticles with good roundness and the average particle size is 404.92 nm.At 80 ℃ in simulated formation water,the expansion ratio of the nano‐microspheres after 24 h of water absorption is 34.96 g/g.Nano‐microsphere WQ‐3 has obvious viscoelastic properties after water absorption,showing the properties of soft solids.At high shear rate,nano‐sphere WQ‐3 system has better shear resistance;the injection pressure rises rapidly and the oil recovery increased as high as 14.25% of the injection of WQ‐3 system.