复杂断块底水油藏含水上升规律

渤海湾盆地南堡凹陷发育带有隔夹层的复杂断块底水油藏。底水油藏油水界面处隔夹层控制着底水锥进速度及单井水淹时间,如何利用隔层控制油藏含水上升速度对延长单井见水时间及提高油藏水驱开发效果至关重要。在精细刻画油藏隔夹层分布模式的基础上,利用修正的底水油藏见水时间公式,研究了隔夹层对油藏含水上升的变化规律。最终确定油井隔层半径为150 m时,既可以有效传导底水能量,又能够延长油井见水时间,此时计算油井见水时间为2 a;南堡凹陷堡古2油藏应用针对性的控水稳油对策,取得了较好开发效果。

WATERCUT RISING RULES OF THE COMPLEX FAULT-BLOCK OIL RESERVOIRS WITH THE BOTTOM WATER

Complex fault-block bottom-water oil reservoirs with the barriers and interlayers are well-develop in Nanpu Sag of Bohai Bay Basin.The barriers and interlayers near the oil-water interfaces control the velocity of the bottom water coning and flooding time of the individual-well.It is crucial that how to make full use of the barriers to control the watercut rise velocity to extend the breakthrough time and increase water-driving development effects.Based on the finely describe the distribution patterns of barriers and interlayers,with the help of the modified computing formula of the water breakthrough time of the reservoirs,the changed and influenced rules of the water cut rising were studied by the barriers and interlayers.Finally it is determined that 150 m barrier radius can effectively conduct the energy of the bottom water and extend the breakthrough time.At this time,the water breakthrough time of the oil well is calculated about two years.Reservoir Pugu 2 in Nanpu Sag has obtained much better development efforts by applying the targeted strategy of water control and oil stabilization.