An improved model for predicting liquid loading onset in inclined pipes with non-uniform liquid wall films
| Autor: | Milan Stanko, Tomáš Oplt, Cleide Vieira |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science Field (physics) 020209 energy Momentum balance Energy Engineering and Power Technology 02 engineering and technology Function (mathematics) Mechanics Geotechnical Engineering and Engineering Geology Physics::Fluid Dynamics Wellbore Friction factor Fuel Technology 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Reduction (mathematics) Liquid holdup |
| Zdroj: | Journal of Natural Gas Science and Engineering. 91:103902 |
| ISSN: | 1875-5100 |
| Popis: | Liquid loading is a phenomenon in which liquid accumulates in the wellbore of mature gas wells, causing a significant reduction in production and sometimes permanent well abandonment. This paper introduces a new model for predicting liquid loading onset, based on the reversal of a non-uniform liquid film. The momentum balance equation for annular flow is, in the proposed model, expressed as a function of liquid holdup instead of liquid thickness. The model employs auxiliary correlations to obtain liquid holdup and an interfacial friction factor, developed from literature data. The accuracy of the proposed model is quantified by comparing laboratory data from this work and field datasets from previous studies, with the predictions of existing models. The proposed model successfully reproduces the experimental data and field data, and gives the highest prediction accuracy and the lowest average error when compared with existing models. The proposed model therefore represents a significant improvement on existing models. The applicability of auxiliary correlations means that this model should be restricted to upward pipe inclinations of 30°–90° from the horizontal, liquid viscosities of 1.1 cP and 0.018 cP, and superficial velocities of gas of 3–60 m/s and of liquid of 0.01–0.2 m/s. Results show that the model exhibits poor performance when applied to pipe inclinations lower than 30° from the horizontal. |
| Databáze: | OpenAIRE |
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