缝洞型油气藏物理模拟试验方法研究

Vuggy-Fractured Carbonate Reservoirs Physical Simulation Methods

在钻完井、调剖堵水、重复压裂等各种工艺措施实施前,一般都要在室内对各种工作流体进行物理模拟试验来评价其应用性能,以完善工作液的配方和施工工艺,而裂缝性油气藏裂缝的产状、开度、方位等参数对工程实施效果有直接影响。因此,在室内对岩心造缝使之能更真实地模拟地层显得尤为重要。介绍了各种岩心造缝方法,分析了各自的优缺点,最后结合建立碳酸盐岩缝洞型油气藏物理模型的难点,提出了一种新颖的缝洞微观物理模型,并进行了微观物理模拟试验,结果表明,该模型可较好地描绘凝胶堵水后水驱残余油的动态过程,这对认识缝洞性油气藏的封堵机理和研究水驱提高采收率的机理具有一定的指导意义。

Generally the fluids were evaluated in laboratory to evaluate its application performance to improve the liquid formulation and implementation technology before well drilling and well completion,profile control and water plugging and hydraulic fracturing.For fractured reservoirs,the fracture configuration,aperture and direction would directly affect treatment results;therefore it is important to create artificial fractures which can simulate formation realistically.This paper introduced a variety of methods on how to create artificial fractures and analyzed their advantages and disadvantages.A micro-physical model of carbonate reservoir with fractures and cavities was proposed considering the difficulties of building a physical model,and the micro-physical simulated experiments were conducted.The experiment results indicated that this model can effectively display the dynamic flooding procedure after gel injection.It can provide the guidance on fractured vuggy reservoir blocking mechanism and oil recovery mechanism with water flooding.