THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Experimental study on gas-liquid-coal fines three-phase flow in undulating pipeline

ABSTRACT
The aggregation of coal fines particles at the bottom of the coal-bed methane well is a common occurrence during production, which could inhibit the flow in the bottom of wells and have adverse effect on the downhole equipment. In this work, gas-liquid-solid three-phase flow experiments were carried out to investigate the migration and discharge of coal fines particles in undulating pipeline. The experiments were conducted in down bent V-shaped pipes with different inclination angles. Based on the conductivity method, the real-time liquid holdup at three positions of the elbow was measured by the developed software. The slugs were identified on the time series curves of liquid holdup, and the characteristics of each slug were calculated, such as length and translational velocity. Meanwhile, the moving of particles with different size and concentration can be observed through visualized flow channel. The dyed coal fines particles are injected into the multiphase flow loop. By observing whether they can be discharged from the V-shaped pipe, the lower limits of superficial gas and liquid velocities to avoid particle retention at the elbow were determined. A correlation to predict the critical gas and liquid velocity was presented, and the accuracy of the calculation model was verified in comparison with the experimental results.
KEYWORDS
PAPER SUBMITTED: 2017-12-18
PAPER REVISED: 2018-05-04
PAPER ACCEPTED: 2018-05-14
PUBLISHED ONLINE: 2018-06-03
DOI REFERENCE: https://doi.org/10.2298/TSCI171218162W
REFERENCES
  1. Mishra D.P., et al., Computational Investigation on Effects of Geo-Mining Parameters on Layering and Dispersion of Methane in Underground Coal Mines - A Case Study of Moonidih Colliery, Journal of Natural Gas Science and Engineering, 53(2018), pp.110-124
  2. Hummel J.A., et al., Quantifying the Benefits of Coal Mine Methane Recovery and Use Projects: Case Study on the Application of In-Mine Horizontal Pre-Drainage Boreholes at Gassy Coal Mines in India and the Optimization of Drainage System Design Using Reservoir Simulation, Environmental Technology and Innovation, 10(2018), pp.223-234
  3. Rui Z., et al., A Quantitative Oil and Gas Reservoir Evaluation System for Development, Journal of Natural Gas Science and Engineering, 42(2017), pp.31-39
  4. Rui Z. et al., A Quantitative Framework for Evaluating Unconventional Well Development, Journal of Petroleum Science and Engineering, 166(2018), pp.900-905
  5. Al-Safran E., et al., Investigation of Slug Flow Characteristics in the Valley of a Hilly-Terrain Pipeline, International Journal of Multiphase Flow, 31(2005), 3, pp.337-357
  6. Al-Safran E., et al., Mechanistic/Probabilistic Modeling of Slug Initiation in a Lower Elbow of a Hilly-Terrain Pipeline, SPE Annual Technical Conference and Exhibition, San Antonio, USA, 2006
  7. Al-Safran E., et al., Statistical Analysis and Hydrodynamic Modeling of Unsteady Gas-Liquid Slug Velocity Behavior, Journal of Petroleum Science and Engineering, 109(2013), 5, pp.155-163
  8. Mandal T.K., et al., Effect of Undulation on Gas-Liquid Two-Phase Flow through a Horizontal Pipeline, Chemical Engineering Research and Design, 86(2008), 3, pp.269-278
  9. Ersoy G, et al., Three-Phase Gas-Oil-Water Flow in Undulating Pipeline, Journal of Petroleum Science and Engineering, 156(2017), pp.468-483
  10. Bassani C.L., et al., A Three-Phase Solid-Liquid-Gas Slug Flow Mechanistic Model Coupling Hydrate Dispersion Formation with Heat and Mass Transfer, Chemical Engineering Science, 178(2018), pp222-237
  11. Stevenson P., et al., The Transport of Particles at Low Loading in Near-Horizontal Pipes by Intermittent Flow, Chemical Engineering Science, 56(2001), 6, pp.2149-2159
  12. Najmi K., et al., Experimental Study of Low Concentration Sand Transport in Multiphase Viscous Horizontal Pipes, SPE Production and Operations Symposium, Oklahoma City, USA, 2015
  13. Yan W., et al., Experimental Study on Sand Transport Characteristics in Water and Air-Water Flow in Dip Pipeline, 15th International Conference on Multiphase Production Technology, Cannes, France, 2011
  14. Osho A.J., et al., Experimental Study of Air-Water Flow in Undulating Pipeline and Implication on Sand Transport, Offshore Technology Conference, Houston, USA, 2012
  15. Osho A.J., Effects of Pipe Orientation on Sand Transportation, Ph. D. thesis, Cranfield University, Cambridge, UK, 2013
  16. Han G., et al., Experimental Study of Gas-Liquid-Coal Fines Three-Phase Flow in Undulating Horizontal Wellbore, SPE Annual Technical Conference and Exhibition, Dubai, UAE, 2016
  17. Fossa M., Design and Performance of a Conductance Probe for Measuring the Liquid Fraction in Two-Phase Gas-Liquid Flows, Flow Measurement and Instrumentation 9(1998), 2, pp.103-109
  18. Taitel Y., Dukler A.E., A Model for Predicting Flow Regime Transitions in Horizontal and Near Horizontal Gas-Liquid Flow, Aiche Journal, 22(1976), 1, pp.47-55
  19. Cvetinovic D. B., et al., Review of the Research on the Turbulence in the Laboratory for Thermal Engineering and Energy, Thermal Science, 21(2017), suppl. 3, pp. S875-S898
  20. Taitel Y., Barnea D., Slug-Tracking Model for Hilly Terrain Pipelines. SPE Journal, 5(2000), 1, pp.102-109.
  21. Turian R.M., et al., Estimation of the Critical Velocity in Pipeline Flow of Slurries, Powder Technology, 51(1987), 1, pp.35-47