【摘要】 注水采油是一种维持石油产量最常用的方法。既往认为注低盐度水会引起粘土矿物运移损害地层,应当避免。近代的研究则表明,注低盐度水可明显提高原油的采收率。该法由于简便、价廉,而为人所注目。其作用机理为:对注入水波及区域损害使后续水转向,有助于增加注入水的波及系数;矿物表面与注低盐度水之间的离子交换作用,可通过改变岩石表面的润湿性提高注入水的驱油效率。本文拟就相关的机理研究作一简要介绍。更多还原

【Abstract】 Water flooding is currently one of the most common methods to maintain oil recovery from a reservoir. It was previously considered that injection of low saltnity water can damage formation caused by clay minerals migration and should be avoided. Recent studies has shown that injection of low saltnity water can significantly enhance oil recovery. This technology attracts the industry’interest due to its simplicity and low cost. It is now recognized that the induced formation damage,as a result of minerals migration in the water injeaction zone,may play the role of profile control and the multi-component ionic exchange between the mineral surface and low saltnity water may increase oil displacement efficiency through changes in wettability. The related mechanism research briefly introduced in this paper.更多还原