The sand minimum transport conditions in water and two-phase water/air flows in dip pipeline have been experimentally investigated. The investigations were conducted using sand particles of an average diameter of 270 microns. The effect of the concentration was also studied. For water flow tests, similar sand behaviours and VMTC were observed in uphill and downhill pipes, while relatively lower VMTC values were found at the exit of the dip (immediate after the lowest point of dip). For air/water experiments, the sand behaviour observed in the uphill and downhill pipe was different due to the different air/water flow regime. Sand deposition occurred in uphill pipe prior to that in downhill and dip section when below the MTC. Slug flow and aerated slug flow were found to be most efficient flow regime for sand transport in uphill pipe. A comparison has been between the MTC in this study and Yan (2010) using similar particle size and concentrations. The MTC boundaries proposed by Yan (2010) for horizontal and +5° pipe were found to be valid in this study when VSL ≥ 0.35m/s. For VSL ≤ 0.15 m/s and sand concentration ≥ 200 lb/1000 bbl, MTC in this work was surprisingly similar to the MTC boundary for horizontal flow from Yan (2010), which indicated the different slug initiation mechanism in dip pipeline and high upward inclination might reduce the efficiency sand transportation of slug flow. The analysis of the slug translational velocity and mixture velocity showed that the mixture velocity in the slug flow regime was found close to the minimum transport velocity in single phase water flow. However, in the aerated slug flow regime, the mixture velocity was found to be much higher than VMTC in single phase water flow. Moreover, the slug translational velocities were found to be much higher than VMTC in single phase water flow for all MTC.
Experimental study on sand transport characteristics in water and air-water flow in dip pipeline
Experimentelle Untersuchung zur Sandtransport-Charakteristik in Wasser- und Luft-Wasser-Strömungen in schrägen Pipelines
2011
18 Seiten, 16 Bilder, 5 Tabellen, 25 Quellen
Conference paper
English
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