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Processes 2019, 7(2), 109; https://doi.org/10.3390/pr7020109

Numerical Simulation of the Effects of the Helical Angle on the Decaying Swirl Flow of the Hole Cleaning Device

1
College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
2
Department of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NF A1B3X5, Canada
*
Author to whom correspondence should be addressed.
Received: 16 January 2019 / Revised: 3 February 2019 / Accepted: 15 February 2019 / Published: 19 February 2019
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Abstract

The application of the hole cleaning device in downhole is a new technology that can improve the problem of cuttings accumulation in the annulus and improve the hole cleaning effect of the wellbore during drilling. In this paper, the Reynolds Averaged Navier–Stokes model, together with the Realizable k-ε turbulence model, are used to perform transient simulations. The effects of rotational speed, blade shape, and helical angle on the initial swirl intensity and its decay behavior along the flow direction are studied. The swirl number, the initial swirl intensity, the decay rate, the tangential velocity distribution, and the variation of pressure are analyzed. The results indicate that the swirl number of the swirl flow exponentially decays along the flow direction. The straight blade and V-shaped blade have different swirl flow induction mechanisms. Under specific drilling parameters, the critical helical angle is determined for both types of blades. When the selection of the helical angle is close to the critical value, the swirl flow will be close to the axial flow, which is of little help in hole cleaning. Moreover, the rotation direction of swirl flow will change when the helical angle exceeds the critical value. View Full-Text
Keywords: computational fluid dynamics; horizontal wellbore; hole cleaning device; decaying swirl flow; swirl intensity computational fluid dynamics; horizontal wellbore; hole cleaning device; decaying swirl flow; swirl intensity
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Qu, J.; Yan, T.; Sun, X.; Li, Z.; Li, W. Numerical Simulation of the Effects of the Helical Angle on the Decaying Swirl Flow of the Hole Cleaning Device. Processes 2019, 7, 109.

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