固相沉积模型在高凝油藏注水开发中的应用

传统的油-水两相热采模型在进行高凝油注水开发的数值模拟过程中,仅能考虑黏度和相对渗透率曲线随温度变化的影响,而无法表征蜡的固相沉积作用对储层物性的伤害,这种物性变化也是应用不同温度下相对渗透率曲线的前提.为弥补两相热采模型中的这一缺陷,提出了利用固相沉积模型模拟高凝油藏开发,建立了油-水-固三相的热采数值模拟方法,通过与两相热采模型的模拟结果对比,表明蜡沉积对储层渗透率的伤害是高凝油田早期注水开发中最大的影响因素.同时结合热采模型获得了不同注水温度下蜡沉积半径及伤害程度等的定量认识,对更好地研究和预测高凝油田注水开发动态具有重要的指导意义.

Application of solid deposition model to water flooding simulation in high pour point oil reservoir

Conventional water-oil two-phase thermal recovery modeling for numerical simulation of waterflooding in high pour point oil reservoir only considers the effects of changes in viscosity and relative permeability curves with varying temperatures. This approach is unable to characterize the damage of wax solid deposition to formation permeability, although such permeability changes form the premise for application of relative permeability curves at different temperatures. To address this issue, solid deposition modeling is used to simulate the development of high pour point oil reservoir, and a novel numerical simulation method of oil-water-solid three-phase thermal recovery modeling is developed. A comparison analysis of thermal modeling data between the three-and two-phase methods shows that damage to formation permeability by wax deposition is the most significant factor influencing early waterflooding in high pour point oil field. Additionally, quantitative information including the radius of wax deposition and the extent of permeability damage at different injection temperatures are obtained through thermal recovery modeling. The results have great implications for better studying and predicting the dynamic characteristics of waterflooding in high pour point oil field.