采用供给边界压力预测底水突破前水锥参数

A calculation method for water-coning parameters before bottom water breakthrough using supply boundary pressure

针对已建立的射孔段下部底水渗流预测模型中单纯采用球面流描述的缺陷,提出了射孔段下部的渗流是从径向流逐渐过渡到球面流的,并假设原始油水界面压力等于供给边界处的压力。在理论模型的基础上,建立了预测临界产量、水锥形态以及优化射孔长度的数学模型。对油井的射孔长度进行了优化设计,结果表明按照最优射孔段生产能够显著地提高油井的临界产量。

The shortage of the basal water flow prediction model at the lower part of perforation intervals is spherical flow description purely. It presents that the percolation at the lower part of the perforation intervals changes from the radial-flow to the spherical flow. It is supposed that the original oil/water interface pressure is equal to the pressure at supply boundary. On the basis of this theoretic model, the critical production rate, the shape of water coning and the optimum perforation intervals could be calculated by the corresponding mathematical model. The optimum perforation length of oil wells is designed by optimization. It shows that the critical production rate would be increased when production at the optimum perforation intervals.