低渗透油藏非达西渗流面积井网见水时间计算

Calculation of water breakthrough time in non-Darcy seepage flow well pattern of low permeability reservoirs

根据低渗透油藏面积注水开发的特点,在流管模型基础上推导出考虑启动压力梯度的四点井网、五点井网、反九点井网的油井见水时间的计算公式,并结合油田实际生产数据给出计算分析结果.该方法解决了低速非达西渗流不同于达西渗流的生产井见水时间的计算问题,为低渗透油田注水开发方案的设计提供了理论依据.

The water breakthrough time formula of considering the startup pressure gradient is presented for the 4-spot,5-spot and invert 9-spot well patterns by means of characteristics of the pattern water flooding exploitation in low permeability reservoirs and on the basis of stream tube model,along with calculation and analysis results by actual oil production data.This method solves the theoretical calculation problem of production well breakthrough time in low-speed non-Darcy flow different from Darcy flow,which serves as the basis of water-flooding program design in low permeability reservoirs.