安塞油田坪北区低渗透油藏裂缝的利用与改造

The utilization and reform of the fractures of low permeability reservoirs in Pingbei Area of Ansai Oilfield

安塞油田坪北区天然裂缝是有规律地存在的,它能提供高渗透通道,改善油层的出油和吸水能力,也可能造成方向性水窜,降低水驱油效率。根据裂缝自身发育规律加以利用和改造,通过沿主导裂缝方向布井、钻加密井、调剖与堵水、不稳定注水、沿裂缝井排线强化注水等,能有效地提高低渗透油藏注水开发效果。

There are regularly distributed natural fractures existed in the reservoirs of Pingbei Area of Ansai Oilfield, which can provide high permeable channels and improve oil production and water intake capacity of oil layer, while they also may create water break through and reduce oil displacement efficiency. According to the development regularity of the fractures to use and reform them, such as drilling along the direction of main fractures, drilling infiller, profile control and water plugging, unstable water injection, and forced injection along the fracture alignment, can significantly improve the waterflood development effect of low permeability reservoirs.