Estimation of Hydrokinetic Pressure and Fluidic Drag Changes during Pipe Installations via HDD Based on Identifying Slurry-Flow Pattern Change within a Borehole
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 8, Issue 4
Abstract
This paper proposes a new method for hydrokinetic pressure and fluidic drag evaluation of non-Newtonian power-law slurries flowing within a borehole during horizontal directional drilling (HDD) pipe installation operations. The method divides the bore path into three segments, each associated with a different stage of slurry flow pattern. For each stage, assuming the product pipe and drill rod to be placed concentrically within the borehole, a set of coupled equations governing slurry flow within the borehole is derived. Then, to obtain the hydrokinetic pressure and fluidic drag history, the equations are solved at the desired product pipe leading head locations within a given segment. For two actual HDD installations completed in Alberta, Canada, the pullback forces have been collected and are compared against those estimated by the new proposed method and Pipeline Research Council International (PRCI) method. It is demonstrated that the new method can more accurately estimate the pullback forces.
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Acknowledgments
The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC), The Crossing Company, and the Consortium for Engineered Trenchless Technologies (CETT), University of Alberta, for supporting and funding this study. Also, the assistance of Lauren Wozny and Sheena Moore at the CETT in editing this paper is greatly appreciated. Furthermore, the authors appreciate the assistance of the anonymous reviewers for providing valuable comments and suggestions to improve this paper.
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Information & Authors
Information
Published In
Journal of Pipeline Systems Engineering and Practice
Volume 8 • Issue 4 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 18, 2016
Accepted: May 4, 2017
Published online: Jul 22, 2017
Published in print: Nov 1, 2017
Discussion open until: Dec 22, 2017
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