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Experimental study of enhanced oil recovery of different gas injection methods in low permeability reservoir at high water-cut stage

机译:高含水期低渗透油藏不同注气方法提高采收率的实验研究

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Gas injection is one of the most effective methods for enhanced oil recovery. Six groups of experiments including rich gas flooding and water alternating gas flooding are implemented by using a long-core displacement device. The oil displacement efficiency of rich gas flooding increases by 15% more than that of water flooding when the volume of injected gas is 1.2 times of hydrocarbon pore volume. The oil displacement efficiency of rich gas flooding is greater than that of water alternating gas flooding when the gas water ratio is one. Rich gas advances in the rich gas flooding stage, thus causing gas channeling and reducing the sweep efficiency of injected gas. Under the same conditions, the gas injection slug is smaller, and the development effect is improved. The gas water ratio is smaller, and the breakthrough time of injected gas is longer. In the early stages of gas injection, the gas water ratio is higher with greater recovery. In the later stages of gas injection, the gas water ratio is smaller with greater oil displacement efficiency.
机译:注气是提高采油率的最有效方法之一。使用长芯驱替装置进行了六组实验,包括富气驱和水交替气驱。当注入气体的体积为烃孔隙体积的1.2倍时,富气驱的驱油效率比水驱提高了15%。当气水比为1时,富瓦斯驱油的驱油效率要高于水交替瓦斯驱油的驱油效率。富气在富气驱替阶段前进,从而导致气体窜流并降低了注入气的吹扫效率。在相同条件下,注气塞较小,提高了开发效果。气水比较小,注入气体的穿透时间较长。在注气的早期阶段,气水比更高,回收率更高。在注气的后期,气水比较小,驱油效率更高。

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