高倾角砂岩油藏注水适应性流线模拟--以乍得B盆地N区块PI2油层组为例

STREAMLINE SIMULATION OF WATER INJECTION ADAPTABILITY IN HIGH DIP SAND⁃STONE RESERVOIR--TAKING PI2 RESERVOIR GROUP OF BLOCK N IN B BASIN OF CHAD AS AN EXAMPLE

为了解决乍得B盆地N区块PI2组高倾角油藏能量补充问题,结合实际地质参数建立了高倾角理论模型,模拟了不同注水方式的水驱油效果,并计算了流体的流动轨迹和时间。通过分析不同注水方式的水驱油效果和流线轨迹,研究不同注水方式在高倾角砂岩油藏中的适应性。研究表明,高倾角油藏的以底部注水为主的注水效果要整体好于其他注水方式,这是由于高倾角油藏的底部注水更能体现油的“浮力”的作用,更接近于“活塞式驱油”。底部注水为主配合顶部注水辅助重力卸油的注水方式的水驱油效果最佳,更能体现“浮力+重力”的双重作用。

In order to solve the energy supplement problem of PI2 high dip reservoir in block N of B Basin in Chad,a theoreti⁃cal model of high dip was established based on the actual geological parameters,and the water displacement effect of differ⁃ent water injection methods was simulated,and the flow trajectory and time of fluid were calculated.Through the analysis of water displacement effect and streamline trajectory of different water injection methods,the adaptability of different water in⁃jection methods in high angle sandstone reservoir was studied.The research shows that the water injection effect of bottom water injection in high dip reservoir is better than other water injection methods.This is because the bottom water injection in high dip reservoir can better reflect the"Buoyancy"effect of oil and is closer to"Piston Oil Displacement".The water flood⁃ing effect of bottom water injection combined with top water injection assisted gravity unloading is the best,which can reflect the dual role of"buoyancy+gravity".