考虑紊流与不完善性的气井动态预测模型

A Model for Forecasting the Gas Well Dynamic with Turbulence and Imperfection

通过将气藏分成三个流动区域,即层流区、过渡区与紊流区,推导出考虑紊流与不完善性影响的气井产能的新关系式。研究表明,完井与射孔不完善性是影响气井产能的最重要因素之一,其次依次为产气量、有效厚度及供气半径,渗透率对气井产能的影响最小。对于高产气井,产能论证及方案设计中必须考虑紊流对气井产能的影响,否则会产生很大的误差,并根据计算给出了应该考虑紊流影响的渗透率与气井产量的界限,研究成果对提高气井动态分析水平具有现实意义。

By dividing a gas reservoir into three flow areas, namely, laminar region, transition region and turbulent region, a new relationship about the gas well deliverability is constructed by taking into account the influence of turbulence and perforating imperfection. The study concludes that completion and perforating imperfection are the main factors influencing gas well deliverability, while gas production rate, effective thickness and drainage area are in the next place, and permeability shows the minimum influence. Moreover, for wells with high gas rate, the influence of turbulence must be considered during the rate argument and program design to avoid significant errors. At last, boundaries of permeability and rate are calculated when the influence of turbulence must be considered. The above results are with realistic significance for increasing the level of analysis on gas well performance.