中文摘要：

川西定向气井测压呈典型的两段分布,下部压降梯度大的原因是受到液相滑脱损失和倾斜段的影响。针对垂直段和倾斜段分别统计评价工程常用的气液两相管流压降模型：垂直段产气量低于1×104m3/d时采用无滑脱模型,否则采用Hagedorn＆Brown模型;倾斜段采用DPI模型。组合建立适用于定向井的气液两相管流新模型。大牛地气田应用实践表明,新模型各项误差均小于5%,明显优于常规单一压降模型。

英文摘要：

In western Sichuan gas field, measured pressure data in inclined gas well shows typical characteristics of two-stage. This paper analyzes the pressure gradient, and conclusion that it is influenced by gas-liquid slippage loss and inclined section. So we divided into vertical section and inclined section, and then statistically evaluate the common gas-liquid two phase pipe flow model. The conclusion is that the vertical gas production is less than 1 ~ 10~m3/d using no-slip model, otherwise we use Hagedorn and Brown model, and the DPI model is used in inclined section. Finally, forming a new model applies to inclined gas wells. Measured pressure data in Daniudi gasfield shows that the new model errors are less than 5%, and it is better than conventional model of pressure drop. Research results in deviated reservoir and condensate gas reservoir development have important application value and practical significance.