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提高油气田高含水期的采收率,是我国油气田急需解决的问题。水气交替注入方法是油气田提高原油采收率的一种有效方法。本文通过室内岩心实验,研究了低渗储层岩心,水气交替注入方法对驱油效率和相对流度的影响。室内实验研究表明,水气交替注入方式可以提高原油驱油效率17.0%;水气交替注入方式过程中的相对流度比水驱过程中的相对流度平均提高0.06mPa.s-1。水气交替注入方式第一周期的驱油效率高于第二周期。岩心的渗透率对水气交替注入方式最终驱油效率和相对流度有很大影响。研究水气交替注入方法对于油田高含水期提高采收率具有重要意义。
It is an urgent problem to be solved in China to improve the recovery rate of oil and gas fields in high water cut. Alternate injection of water and gas is an effective way to increase oil recovery in oil and gas fields. In this paper, indoor core experiments were carried out to study the effects of low permeability reservoirs, alternating water and gas injection methods on oil displacement efficiency and relative fluidity. Laboratory experiments show that the alternating water and gas injection method can increase the oil displacement efficiency by 17.0%, and the relative fluidity in the alternative water vapor injection mode increases by 0.06 mPa.s-1 relative to the relative flow rate in the waterflooding process. The displacement efficiency of the first cycle of alternating water and gas injection is higher than that of the second cycle. Core permeability has a significant effect on the final flooding efficiency and relative mobility of alternating water and gas injection. Studying alternating water and gas injection methods is of great significance for enhancing oil recovery in high water cut stage.