改进的低渗透带隔板底水油藏油井见水时间的预报式

底水油藏开发面临的核心问题是底水的锥进,准确的预测底水油藏油井的见水时间至关重要,它可为合理地制定油藏的开发方案提供依据。基于底水锥进和低渗透非达西渗流原理,考虑隔板下部底水锥进的垂向渗流方式和沿隔板的径向渗流方式,推导出低渗透带隔板的底水油藏油井见水时间的预测公式。对于低渗透带隔板的底水油藏,由于考虑了启动压力梯度和应力敏感等因素的影响,计算出的油井见水时间要比不考虑以上因素的值大。经鄂尔多斯盆地某油井的实际计算,预测的见水时间与实际见水时间较接近。该公式为准确预测此类油井的见水时间提供了借鉴和指导意义。

A modified water breakthrough time prediction formula for low-permeability bottom water reservoirs with barrier

The main problem of bottom water reservoir development is water coning, it is very important to predict accurately the oil well water breakthrough time which can provide basis for reasonable development scheme for reservoir. The author based the water coning and low-permeability non-Darcy seepage principle, considered the coning of bottom water vertical seepage and the radial flow along the barrier, derived the prediction formula of water breakthrough time of low permeability bottom water reservoir with barrier. For low permeability bottom water reservoir with barrier, because of considering the influence of the starting pressure gradient and stress sensitivity factors, the calculated water breakthrough time is larger than that without considering the above factors. Through the actual calculation of oil wells in Erdos Basin, the prediction water breakthrough time is close to the actual. The formula can provide reference and guidance for predicting such wells water breakthrough time accurately.