海上油田在线调剖体系研究与应用

Research and application of on-line profile control agent for offshore oilfield

针对渤海油田干粉聚合物需要长时间的熟化溶解,配套注入设备占据较大平台空间的问题,研发了适用于海上油田平台施工的水包水型和油包水型2种乳液聚合物在线调剖体系,并在目标油藏条件下,优化了乳液聚合物冻胶体系配方。其中,水包水型乳液聚合物冻胶最佳配方为:0.8%~2%水包水型乳液聚合物+0.2%~0.5%酚醛树脂交联剂,油包水型乳液聚合物冻胶最佳配方为:0.2%~0.5%油包水型乳液聚合物+0.2%~0.5%酚醛树脂交联剂。2种乳液聚合物冻胶体系均可实现在线注入,且具有良好的抗剪切性、注入性、封堵性以及耐冲刷性。通过室内评价实验表明,乳液聚合物冻胶体系在经过岩心剪切2PV(孔隙体积)后,即可以成胶,封堵率均达到97%以上,且后续水驱冲刷10个PV后仍具有较高的残余阻力系数。另外,该体系在渤海某油田进行了实际应用,并取得了较好的增油降水效果。

According to the problem that powder polymer needs long time to dissolve and the injection equipment needs large space of platform,two kinds of on-line profile control agent,including water in water and water in oil emulsion polymer gel were developed for offshore oilfield platform.Its formula of gel was optimized in the condition of target reservoir.The optimum formula of water in water emulsion gel was 0.8%~2%water in water emulsion polymer+0.2%~0.5%phenolic resin prepolymer cross-linked agent and the optimum formula of water in oil emulsion gel was 0.2%~0.5%water in oil emulsion polymer+0.2%~0.5%phenolic resin prepolymer cross-linked agent.The two kinds of emulsion polymer could be injected on line,and had good shear resistance,injection property,plugging property and erosion resistance.The results of performance evaluation experiments showed that the emulsion polymer gel could be formed after shearing 2 PV through core,and plugging rate could reach above 97%.The coefficient of residual resistance could maintain relatively high after 10 PV water flooding.It was applied in Bohai oilfield,which has obvious effect of oil increment and water reduction.