Effect of Gear-Pump Shear Rate on Oil/Water Dispersion
- Mo Zhang (University of Tulsa) | Ramin Dabirian (University of Tulsa) | Ram Mohan (University of Tulsa) | Ovadia Shoham (University of Tulsa) | Shoubo Wang (University of Tulsa)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2019
- Document Type
- Journal Paper
- 536 - 550
- 2019.Society of Petroleum Engineers
- droplet size distribution, oil/water dispersion, gear pump
- 13 in the last 30 days
- 28 since 2007
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Production equipment, such as pumps and chokes, cause shear in oil/water-mixture flow and form smaller droplets in the system, which might lead to operational and separation problems. Our objective in this paper is to provide new data on droplet sizes under different shear conditions in oil/water flow and compare these data with model predictions.
New experimental data on droplet-size distribution are acquired for a gear pump (configured in a closed loop) with an inline camera, using the bead-sizing tool. The acquired data capture the effects of the dispersed-phase volumetric fraction and shear intensity. Two prediction models for a centrifugal pump, the Pereyra (2011) and Kouba (2014) models, are modified to enable droplet-size-distribution predictions for a gear pump. These models use the log-normal-distribution and Rosin-Rammler-distribution methods, which have been found to match the acquired data relatively well.
The results demonstrate that mean droplets tend to decrease in diameter when the shear intensity increases. Moreover, the higher the dispersed-phase volumetric fraction is, the larger the resulting droplets will be. Comparisons between the acquired data and the proposed droplet-size-distribution prediction, which uses the modified dmax model, are very good for both Rosin-Rammler and log-normal distributions, with normalized root-mean-square deviation (NRMSD) of less than 7%.
|File Size||1 MB||Number of Pages||15|
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