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不稳定注水能够提高注水波及系数和驱油效率,控制含水上升速度,提高油藏采收率,在油田开发中得到广泛应用。罗36断块为一狭长的封闭性小型断块,储层岩性以生物碎屑灰岩和砂屑灰岩为主,非均质性强,裂缝较发育,原油性质较差,油稠、凝固点高,油水粘度比大。开发过程中,难以建立完善的注采井网,注采对应率率较低,含水上升快,采收率低。针对罗36块油藏特点和开发中的问题,开展了不稳定注水周期、注水量等方面的研究,现场应用后取得显著的控水增油效果,达到了改善区块开发效果的目的。该块的实践表明,裂缝型断决油藏实施整体不稳定注水技术对于补充地层能量、扩大注入水的波及体积改善油藏开发效果具有重要的意义。
Unstable water injection can improve water injection coefficient and flooding efficiency, control water-bearing ascending velocity and enhance oil recovery, which has been widely used in oilfield development. Luo 36 fault block is a narrow, long and narrow closed fault block. The lithology of reservoirs is dominated by bioclastic limestone and sandy litter, with strong heterogeneity, relatively developed fractures, poor crude oil properties, thick oil, High freezing point, oil-water viscosity ratio. In the process of development, it is difficult to establish a perfect injection and production well pattern. The corresponding rate of injection and production is low, the water cut increases rapidly and the recovery rate is low. In view of the characteristics and development problems of Luo 36 reservoir, the research on unstable water injection cycle and water injection has been carried out. Significant water control and oil enhancement effect has been achieved after on-site application, achieving the purpose of improving the development effect of blocks. The practice of this block shows that the implementation of the overall unstable waterflooding technology in fracture-type fractured reservoirs is of great significance for supplementing formation energy, expanding the volume of injected water and improving the reservoir development effect.