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Title: Horizontal directional drilling: the influence of uplift and downlift during the pull-back operation
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2187s
Date of Publication: Dec 1 2009 12:00AM
Price: $25.00 US
Authors: F Podbevsek, H J Brink, and J. Spiekhout
Abstract: IN EARLIER WORK it was shown that, especially for large-diameter pipelines, the stiffness of the pipe in relation to the soil properties is an important factor in avoiding problems related to the bending radius. Also it was shown that there are high soil reactions at the head of the pipe string in the curved section of the borehole. In this paper, the influence of creating uplift or downlift when ballasting the pipe string during the pull back operation is studied.
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