注入水中的悬浮颗粒对特低渗透油藏开发效果的影响

在特低渗透油田注水开发过程中，注入水中的悬浮颗粒会伤害油层的渗透率，导致注水井的吸水能力降低和油井产能下降，影响开发效果。采用物理实验和油藏工程的方法，研究注入水中的悬浮颗粒对特低渗透油藏的注入压力，地层渗透率和产能的影响，得到的结论是：岩心渗透率越低，注入水的注入压力与地层水的注入压力之差越大；在渗透率相同的情况下，滤膜孔径越小，注入水渗流阻力越低；处理注入水的筛网尺寸越大，油层渗透率伤害越大，特低渗透油藏的产量和极限供油半径越小。

The effect of suspended particles from injected water on the developmentof super low-permeability reservoirs

Water quality of injected water affects on the development efficiency of low permeability reservoir, injuries the formation permeabi lity , and makes water injectivity and oil productivity decrease in water flooding. Through the methods of physical experiment and reservoir engineering, this paper studies the effect of suspended particles from injected water on the injected pressure, formation permeability, and oil productivity in low permeability reservoir. It is concluded that as rock permeability decrease, the value of injected pressure between injected water and formation water become larger, as the pore diameter of mesh filter decreases, the resistance force of percolation flow through porous media becomes small, and the injury of formation permeability becomes larger, when the formation is seriously injured by the suspended particles from injected water, the production and drainage radius in low permeability reservoir become small. This paper gives theoretical instruction and calculation method for water flooding in low permeability reservoir.