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在油田实际开发中,经常遇到反九点井网问题,而由于反九点井网的不对称性,导致角边井工作制度的不同会影响到其水驱开发效果。为了研究反九点井网的水驱开发特征,该文通过压降叠加原理得到了其稳态压力分布方程,并通过求解流函数方程得到了反九点井网流线场,最后,沿着流线利用特征线方法解析求解了饱和度方程,从而实现了对反九点井网的水驱开发模拟。研究结果表明:角边井的流量比R的变化会直接影响到井网的流场分布以及各项水驱开发指标的变化;随着R的增加,流向角井的流线数目增多,且角井的水驱控制面积增大,此外,井网见水时刻的面积波及效率也随之增大,但当其增大到一定程度后,增加速度明显减缓,并最终将趋向于五点井网的面积波及效率。研究结果揭示了反九点井网的水驱开发特征,为实现反九点井网的合理开发提供了理论基础。
In the actual development of the oil field, the problem of anti-nine well patterns is often encountered. Due to the asymmetry of the anti-nine-dot pattern, the difference in the working system of the angle-edge wells can affect the development effect of the waterflooding. In order to study the characteristics of waterflooding in the anti-9-dot pattern, the steady-state pressure distribution equation was obtained by the principle of pressure drop superposition, and the flow field in the anti-9-dot pattern was obtained by solving the flow function equation. Finally, The flowline uses the characteristic line method to solve and solve the saturation equation, so as to realize the waterflooding development simulation for the anti-nine-point well pattern. The results show that the change of the flow rate ratio R in the corner well will directly affect the distribution of the flow field in the well pattern and the change of development indexes of the water flooding. With the increase of R, the number of streamlines in the direction angle well increases, In addition, the seepage efficiency of the well pattern at the time of seeing the water also increases, but when it increases to a certain extent, the increase rate slows down obviously and will finally tend to the area of the five-dot pattern Spread efficiency. The results of this study reveal the characteristics of water flooding development in the anti-9 o’clock well pattern and provide a theoretical basis for the rational development of the anti-9 o’clock well pattern.