低渗透油藏压裂井产能分析

建立并求解了 考虑启动压力梯度影响的有限导流垂直裂縫井不稳定渗流的数学模型,绘制并分析了产能动态典型曲线。分析结果表明,随着生产时间增长,启动压力梯度对产量影响显著,启动压力梯度越大,井的产量下降得就越快。裂縫导流能力和表皮效应均对压裂井初期产能影响显著。导流能力越大,压裂井的产量就越高。随着裂縫导流能力的增加,井的增产幅度不断降低。表皮效应越严重,裂縫井的产量就越低。这对深入认识低渗透油藏有限导流垂直裂缝井的生产动态具有重要意义。

Productivity Analysis of Fractured Well in Low Permeability Reservoir

A mathematical model of unsteady percolation for well with finite conductivity vertical fractures considering threshold pressure gradient is developed.Its typical productivity performance curves are drawn and analyzed.The analysis shows that the longer the producing time,the greater the threshold pressure gradient is,and the faster the production decline is.The fractural conductivity and skin effect have a great effect on the initial productivity of fractured well.The greater the fractural conductivity,the higher the output of fractured well is,but the lower the extent of the incremental production is;the more obvious the skin effect,the lower the output of fractured well.These are of significance for in-depth understanding of the producing performance of well with finite conductivity vertical fractures in low permeability reservoir.