单缝单洞缝洞型碳酸盐岩底水油藏弹性开采机理研究

Study on the elastic production mechanism in fractured-vuggy carbonate reservoir of single fracture and single cave with bottom water

单缝单洞底水体系是一种简单的缝洞模式,但对于探索缝洞型底水油藏的开采机理和开发规律至关重要.结合流体在裂缝中的运动规律和液体弹性膨胀理论,建立了单缝单洞底水缝洞油藏弹性开采时油水两相流动的数学模型,用数值方法求解揭示了油水流动规律,得到了产油量、产水量、含水率和采出程度随时间的变化规律,以及含水率与采出程度关系曲线.单缝单洞缝洞型碳酸盐岩底水油藏弹性开采的含水率与采出程度关系曲线特征为凸型,见水后含水上升很快.

The fractured-vuggy carbonate reservoir of single fracture and single cave with bottom water is a simple fracture-cave system,but it is important to studying on the elastic production mechanism and development laws of the fractured-vuggy carbonate reservoir with bottom water.The mathematical model of oil-water seepage in the fractured-vuggy carbonate reservoir of single fracture and single cave with bottom water in elastic recovery process is established based on the liquid flow theory in fracture and the liquid elastic expansion theory.It is solved using numerical simulation method,and the varying laws of oil producing rate,water producing rate,water cut and oil recovery efficiency with time,and the relationship between water cut and recovery efficiency are obtained.The relationship be- tween water cut and oil recovery efficiency in the fractured-vuggy carbonate reservoir of single fracture and single cave with bottom water in elastic recovery process is convex curve,and the water cut raises rapidly after water breakthrough.