低渗透油藏变导流垂直裂缝井产能模型

针对水力压裂后油井形成的垂直裂缝中不同位置导流能力不同的特点，根据压裂后流体渗流规律 的变化，推导出考虑启动压力梯度影响的低渗透油藏变导流垂直裂缝井产能预测模型，并分析研究了各 因素对产能的影响。研究结果表明：裂缝导流能力衰减系数对油井产量的影响程度随生产压差的增大而 增强，随裂缝长度的增加而减弱；当裂缝导流能力较小时，裂缝长度越长，裂缝导流能力衰减系数越大，油 井产量越低，反之，裂缝长度越短，裂缝导流能力衰减系数越小，油井产量越高。

A productivity model of vertically fractured well with varying conductivity for low permeability reservoirs

In view of that the flow conductivity of vertical fracture varies at different place after fracturing in the low permeability reservoirs, based on the change of fluid flow rule after fracturing, this paper established a productivity model of vertically fractured well with varying conductivity for low permeability reservoirs, considering the influence of starting pressure gradient, and analyzed the influences of different factors on productivity. The result shows that the influence of the attenuation coefficient on the oil well productivity increases with the enhancement of producing pressure drop, and decreases with the increase of crack length. When the fracture conductivity is small, the longer the crack length is, the bigger the attenuation coefficient is, and the less the oil well productivity is. On the contrary, the shorter the crack length is, the smaller the attenuation coefficient is, and the more the oil well productivity is.