气井连续携液模型比较研究

Comparative Study of Continuous-removal Liquid Models from Gas Wells

气田生产出的天然气中常常含有一些液相物质。若天然气没有充足的能量把液体举升出地面 ,液体将在井中堆积形成积液 ,影响气井的生产能力。积液有时会完全压死气井。已有许多气井连续携液的关联式。为了更好地理解和采用正确的气井连续携液临界流量计算关联式 ,确定气井的合理产量 ,对李闽和Turner的气井连续携液模型进行了比较研究 ,比较的内容包括 :液滴在高速气流中的形状 ;曳力系数 ;临界流速计算公式 ;用现场实际数据对李闽和Turner的气井连续携液模型进行比较。结果表明李闽气井连续携带公式计算的临界流量与实际的生产情况吻合。为了便于现场应用 ,导出了临界流量和产量的计算公式。

Gas produced from reservoir, in many cases, have liquid phase material with it, which can accumulate in the wellbore over time and affect the productivity of gas wells. Sometime it even kill gas wells. There are many relationships to determine terminal velocity. To use the right relationship for determination of terminal velocity and critical rate, the comparative study has been made in the paper. The comparative contents include: (1) the liquid drop shape entrained in high velocity gas stream; (2) drag coefficient; (3) terminal velocity formula; (4) Comparative study with fields data which shows that the results of Min Li's critical rate are in accord with practical situation of gas wells. For the field application, the paper also deduce the simply formula for determining the terminal velocity and critical rate.