长庆油田镇原-泾川区块注入水引起储层伤害的试验评价

油田注水开发是保持地层能量,提高油田采收率的有效手段,已为国内外广泛采用。然而,注水过程中由于注入水与地层条件的不配伍,将会导致储层原有平衡状态遭到破坏,引起储层损害。本实验研究依据渗流力学和油田物理化学方法,在单一流体岩心速敏实验的基础上,结合长庆油田镇原-泾川区长6组储层岩石的矿物类型对研究区注入水引起的储层伤害和发生水敏的因素进行室内分析与评价;为进一步确定该区注水井合理注入速度、注水引起的水敏伤害及改善建议提供了实验依据。

Experimental Study of Water-Injection Damage in Zhen Yuan-Jing Chuan Area of Chang Qing Oilfield

Water injection is an effective method of keeping the formations energy and enhancing oil recovery,which has been widely used.However,when the injected water is not suited for the condition of layers,it will cause the failures of the initial banalnce of formations and bring the formations to damage.This experimental study is based on the principle of fluid mechanics in porous medium and the method of techniques of oilfield physicochemistry,the experiment of velocity sensitivity of single phase fluid and combined the kind of mineral of the Chang-6 unit of Zhen Yuan-Jing Chuan area in Chang Qing Oilfield,which has carried on the laboratory analysis and evaluation of the formations damage in the course of water injection and the factors of causing water sensitivity.By this study,which has offered the research area an experimental reference on fixing on the optimum injection velocity of wells,degree of water sensitivity and suggestions of improving the damage conditions.