水驱前缘移动与地层压力波及之比较研究

The Comparative Study of Water Flooding Front Movement and Formation Pressure Spread

为对比分析平面平行渗流、平面径向渗流和球面向心渗流3种不同渗流方式下水驱前缘移动规律的差异性,依据油藏注水开发理论,应用渗流基本公式及流线积分法和单元分析法,推导出3种渗流方式下的水驱前缘移动公式。在油藏参数相同的条件下,当3种渗流方式中的位移相等时,平面平行渗流的水驱前缘移动速率最快,平面径向渗流次之,球面向心渗流的水驱前缘移动速率最慢。水驱前缘移动的快慢规律与地层压力波及的快慢规律正好相反。从理论上解释了为何在实际油藏注水开发中,一般选用反九点面积注采井网(以井为中心发生平面径向渗流)较多的原因。

To study the difference of movement velocities of water flooding front among linear,radial and spherical flow states,Based on the water flooding theory of oil reservoirs,the waterflooding front movement formula was deduced by using the basic percolation formula,flow line integral method and element analysis method. Water flooding front movement in linear flow is the fastest among the three kinds of flow states,and that in spherical flow is the slowest among them. The law of water flooding front movement is the very opposite of pressure spread. That is why the inverted nine-spot areal well pattern prevail in various kinds of well patterns.