This paper presents the development, validation, and application of a novel methodology to detect when and where liquid loading occurs in horizontal gas wells. Proposed liquid loading onset model is based on two possible mechanisms, namely, liquid film reversal (Barnea 1986) and liquid wave growth (Taitel 1976). Additionally, the liquid entrainment in the gas core and the effect of deviation angle on the liquid distribution along the pipe circumference were considered (Brito 2015). Furthermore, a liquid loading onset detection methodology and software were developed to predict the critical gas velocity along the well trajectory as function of the expected gas and liquid production decline. This facilitates the determination of the time and location (when and where) liquid loading starts and what gas flow rates are required to avoid liquid accumulation at different points along the well. Several case studies, based on data from actual gas wells, are presented to demonstrate the proposed methodology applicability for determining effect of well trajectory, completion, liquid flow rate, operating conditions, and tubing location on liquid loading along the well.

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