用硅钙复合堵剂提高采收率

Using Silica-Calc Complex Plugging Agent for EOR

薄层底水油藏水驱条件下的剩余油易形成U型分布,注入水在驱油过程中逐步下移到底水中,降低了驱油效率。向注入水中加入合适的化学剂使之与地层水中含量较高的钙镁离子反应,逐渐形成一套较低渗透率的作用带,引导注入水逐步向U型水淹区的上部驱动,以达到提高采收率的目的。利用底水模拟装置,模拟了硅钙复合堵剂SCAP与地层水中钙镁离子反应形成低渗透带的可行性,从而提高薄层底水油藏的原油采收率。

For thin and bottom water reservoir, the U-like distribution pattern of remained oil is likely formed in condition of water drive, allowing the injected water to flowing down to the bottom water layer, hence decreasing the oil-displacement efficiency. This paper presents such an idea for allowing the injected water to flowing up to the top of U-like watered-out area by adding suitable chemical agent into the reservoir and making it react with Ca^2＋ and Mg^2＋ in formation water, resulting in gradually forming low permeable zones. The bottom-water modeling equipment is used to simulate the feasibility of such a reaction between silica-calc complex agent （SCAP） and the calcium and magnesium ions for forming low permeable zone, for the purpose of enhancing oil recovery （EOR）.