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| Title: |
The trenchless technique for horizontal-directional drilling: soil-related risks and risk mitigation |
| Category: |
|
| Downloadable: |
Yes  |
| Project No.: |
|
| Research
Agency: |
|
| Catalog No.: |
2166s |
| Date
of Publication: |
Jun 1 2009 12:00AM |
| Price: |
$25.00
|
| Authors: |
Dr Henk Kruse |
| Abstract: |
THE HORIZONTAL-directional drilling technique is very popular nowadays. While the majority of the cables and pipelines installed with this technique succeed, in several cases the technique still lacks sufficient control of the risks arising from the subsurface conditions. Therefore, a soil related-risk analysis for the prevention of unwanted events during the drilling stages or after the installation activities is recommended. The identification of the risks is the most important stage in the risk analysis, and requires sufficient knowledge of the processes during the drilling stages. Once all the risks are qualitatively identified, their importance can be determined. Very often, calculations are necessary to classify the risk in a quantitative or semi-quantitative way. After classifying the risks, mitigation measures can be established for the significant risks. Since an overview of all possible risks in horizontal-directional drilling would be extensive, this paper focuses on the most-often-occurring soil-related risks: high pulling forces or incomplete pull-back caused by local bore instability; high pulling forces or incomplete pull-back caused by frictional forces in the bore; and seepage through the bore to the surface.
References
1. H.J.Bayer, 2005. HDD practice handbook. Vulkan-verlag GmbH, Essen, Germany.
2. H.M.G.Kruse and H.J.Brink, 2007. Soil related risks during the pull-back operation of horizontal directional drilling. Int. No-Dig Conference, Rome.
3. P.Meijers and R.A.J.De Kock, 1993. A calculation method for earth pressures on directionally drilled pipelines. Pipeline conference, Belgium.
4. T.Viehofer, T.Linthof, and A.Bezuijen, 2005. Stability of a borehole during horizontal directional drilling, Proc. No-Dig Conference, Rotterdam.
5. P.P.T.Litjens and H.J.A.M.Hergarden, 2001. A calculation method to determine pulling forces in a pipeline during installation with horizontal directional drilling. Von der production zur service Schrift (Schriftenreihe aus dem institut for Rohrleitungsbau Oldenburg).
6. F.Bisschop, 1995. Transport processes in borehole and pipeline (in Dutch). Drilling of tunnels and pipelines research group, Delft.
7. M.Hetenyi, 1946. Beams on elastic foundations. Scientific Series, Ann Arbor, University of Michigan press.
8. J.P.Pruiksma and H.M.G.Kruse, 2008. Soil-pipeline interaction during the pull-back operation of horizontal-directional drilling. Int. No-Dig Conference, Moscow.
9. R.Boeije and H.Sellmeijer, 1996. Water pipelines below river dykes (in Dutch). H2O, 16, pp478-482.
10. M.Van Staveren, 2007. Uncertainty and ground conditions: a risk management approach. Elsevier, Netherlands.
11. H.J.A.M.Hergarden, 2008. Geotechnical design factors. HDD crossings. Proc DCA Conference, Prien, Germany. |
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