高含水后期厚油层注氮气泡沫控水增油技术研究

Technique of Controlling Water Cut and Increasing Oil Production by Injecting Nitrogen Foam in Thick Reservoirs in Later High Water Cut Stage

挖潜厚油层顶部的剩余油是油田进入高含水开发后期的主攻方向之一。由于氮气泡沫具有对高含水层和高渗透带的选择性封堵及提高驱油效率的作用,因此可以利用向厚油层中注氮气泡沫的方法来控制厚油层水窜,挖潜厚油层中的剩余油。通过室内实验,研制了与试验区地质条件相适应的泡沫剂,并开展了1口井的现场试验,取得了增油2286t,含水下降1.6个百分点的较好效果。

Producing remaining oil on top part of thick reservoir is one of the main targets in later high water cut stage of oil field. Nitrogen foam has effect of selective plugging in high water cut layers and high permeable zones and can improve displacement efficiency, so it can be injected into thick reservoirs to control water channeling and produce remaining oil in them. Through lab experiments, foam agent which is adaptable for geologic condition of tested area is studied and field test is performed in 1 well. Oil production is increased by 2286t, and water cut decreases by 1.6%.