气井携液临界流速多模型辨析

Models of critical liquid carrying flow rate for gas wells

 娄乐勤¹ 耿新中²

中国石化中原油田分公司技术监测中心，河南 濮阳 457001 中国石化中原油田分公司天然气产销厂，河南 濮阳 457061）

Technology Monitoring Center, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Gas Production and Marketing Plant, Zhongyuan Oilfield Company, SINOPEC, Puyang 457061, China)

 围绕气井携液临界流速的计算，有很多理论推导或实践回归模型。因为模型之间的差异很大，在模型选择与应用方面一直没有定论。通过多模型对比与辩证分析发现，模型之间存在基本恒定的比例关系，对井筒两相流动中液相存在形态认定的不同是模型之间的主要区别，没有一种模型可以对井筒连续携液工况作出一个全面合理的解释。依据流体力学基本原理和两相垂直管流流态基本理论，结合实验观察和现场实测流压梯度分析，对井筒携液工况开展了进一步的探讨，认为环雾流同样具有连续稳定的携液能力，液滴雾流并非唯一的连续携液流态，把深究液滴的具体形状作为求解携液临界参数的唯一途径，存在明显的局限性。结合两相携液流态特征，提出了便于现场操作的模型选择与应用意见。

 For calculation of critical liquid carrying flow rate for gas wells, there are many theoretical or practical regression models. Because of the great differences between the models, there are no firm conclusions for choice and application of the model. Models comparison and dialectical analysis show that there is a constant ratio between the models. Different liquid phase flow shapes are the main differences between models, no model can make a comprehensive and reasonable explanation for continuous liquid-carrying shaft condition. According to the basic principles of fluid mechanics and basic theory of two-phase flow pattern in vertical pipe flow, combined with experimental observations and field test analysis of flowing pressure gradient, a further discussion on operating conditions of wellbore fluid carrying is finished. The result shows that circular fog stream also has a continuous and stable liquid-carrying capacity; droplet spray is not the only continuous liquid carrying flow pattern, and delving into specific shapes of the droplets as the only way to solve the critical liquid carrying parameter is quite limited. Considering two-phase liquid flow characteristics, some opinions on model choice and application which is advantageous for scene operation are proposed.

10.6056/dkyqt201604019