气井井筒积液模拟实验研究
Simulation Experiment of Liquid Unloading in Gas Well

气井井筒积液成为影响气井稳定生产的关键因素之一。为了优化气井排液采气工艺，常采用临界携液模型来评价井下积液情况。但气井积液机理一直以来未能得到明确。本文采用多相管流模拟试验，实现在线液膜、液滴测量，明确气井生产过程中液滴、液膜的变化情况。通过系列定量，明确了在气液比233~1463 m3/m3条件下液滴尺寸分布特征。利用液膜剥离、在线ECT和压差测量明确液膜翻转的基本条件，为气井积液机理认识提供有力借鉴。
The accumulation of fluid in gas well has become one of the key factors affecting the stable pro-duction of gas well. In order to optimize the process of gas well drainage and production, the critical liquid carrying model is often used to evaluate the downhole fluid accumulation. However, the mechanism of fluid accumulation in gas wells has not been clarified. In this paper, the multi- phase pipe flow simulation test is used to realize the on-line measurement of liquid film and liquid drop, and the change of liquid drop and liquid film in the production process of gas well is clear. The characteristics of droplet size distribution under the condition of gas-liquid ratio 233~1463 m3/m3 were determined by series quantification. Using liquid film stripping, on-line ECT and differential pressure measurement to clarify the basic conditions of liquid film turnover, it provides a powerful reference for the understanding of fluid accumulation mechanism in gas wells.