非达西流动条件下有限导流垂直裂缝气井IPR曲线

Non-Darcy flow IPR curve of gas wells with vertical fractures of finite conductivity

IPR曲线能够简洁地反映井底流压和井产量之间的关系,是油气井生产系统优化重要依据之一。首先导出表观渗透率,然后通过求解气体拟稳态渗流方程得到包含非达西流动效应的有限导流垂直裂缝井IPR方程。已知裂缝参数、流体物性及地层参数情况下,通过所得到的方程可以计算出IPR方程曲线。研究结果可以直接应用于气井压裂优化设计和压裂气井的产能预测。

The IPR curve reveals the relationship between bottom hole flowing pressure and well production, and is one of the important criteria for production system optimization of the oil and gas wells. The apparent permeability is first derived, then the IPR equation including non-Darcy flow effect is obtained for wells with vertical fractures of finite conductivity by solving pseudosteady state equation of gas flow. The IPR curve can be calculated with known fracture parameters, fluid property and formation parameters. The result of this study can be directly used for gas well fracturing optimization and fluids rate forecast of fractured gas well.