微球水化时间对其深部运移影响研究

Influence of Hydration Time of Microsphere on Its Deep Migration Property

微球作为一种高效的稳油控水技术在渤海油田的应用日趋广泛。深部运移性能直接制约微球调驱的控水增油效果。微球水化时间及水化膨胀倍数的合理确定是实现微球深部运移的必要前提。利用激光粒度仪表征了微球在水溶液中的膨胀性能;重点利用多点测压驱替设备考察了水化时间对微球在填砂管中运移的影响。结果表明:55℃下,微球初始粒径正态分布均值为9.3μm。随着微球在地层模拟水中浸泡时间的延长,粒径不断增大,10 d后微球的粒径正态分布均值为34.5μm。不同水化时间后的微球运移实验结果表明,水化10 d后的微球才表现出明显的封堵性能,说明未明显水化的微球深部运移能力较强。研究结果对微球在渤海油田的推广应用具有重要指导意义。

As an effective technique for stabilizing oil production and controlling water cut, microspheres flooding has been widely used in Bohai offshore oilfield. Deep migration of microspheres in porous media is key performance which influences the role of microspheres on stabilizing oil production, blocking up water and tapping the potential oil.The reasonable determination of the hydration time and swelling ratio of the microspheres is the necessary prerequisite for the deep migration of microspheres. In this paper, the swell property of typical microspheres was briefly studied by particle size instrument. On this basis, the influence of the microspheres mass concentration and hydration time on the migration ability of the microspheres in sand-packed tube and different injection timing on oil recovery were investigated by displacement equipment with multi-point pressure measuring capability. The results showed that the initial particle size of the microspheres was 9.3 μm at 55 ℃. The particle size of microspheres increased continuously with the hydration time when they were hydrated in simulated water. After 10 days hydration, the mean diameter of the normal distribution of microspheres was 34.5 μm. The plugging performance of the microspheres in porous media after different hydration time was studied. It was after 10 days of hydration that the microspheres showed obvious plugging properties. This study can promote the further application of microsphere in Bohai offshore oilfield.