DOI: 10.3724/SP.J.1249.2018.06551

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:6 PP.551-557

A new model for predicting critical gas velocity ofliquid loading in horizontal well

Liquid loading is one of the most common problems that severely affect the production in gas wells. Accurate prediction of critical gas flow rate to carry the liquid in wellbore is vital for decision on taking measures in time to reduce the impact of liquid loading on the gas production. At present, most of the available models for predicting critical gas flow rate commonly used in engineering are derived from the analysis of forces onto the liquid droplets in vertical wells. As for the horizontal wells, it is then calculated from droplet-entrained models by adding an angle term, without considering the effects of liquid flowing rates and pipe diameter. In this paper, we establish a visualized experimental setup to simulate gas-liquid flow in a horizontal well. By recognizing the liquid-film reversal using a high speed camera, we conduct a series of experiments under the conditions of different angles, pipe sizes and liquid flowing rates. We establish a simple critical gas velocity model based on the experimental data using the WALLIS empirical equation and its correction with the effects of angle. We verify the accuracy of new model using the published data, with the agreement of 95.45% for COLEMAN's data and 80.59% for VEEKEN's data, respectively. This research work provides an effective method for the prediction of liquid loading in horizontal gas wells.

Key words:oilfield development,liquid loading of gas well,horizontal well,critical gas velocity of liquid loading,angle correction,pipe diameter

ReleaseDate:2018-12-14 06:52:45

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