Fluidic Drag in Horizontal Directional Drilling and its Application in Specific Energy Open Access
- Other title
Horizontal Directional Drilling
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Bayat, Alireza (Civil and Environmental Engineering)
- Examining committee member and department
Han, SangUk (Civil and Environmental Engineering)
She, Yuntong (Civil and Environmental Engineering)
Department of Civil and Environmental Engineering
Construction Engineering and Management
- Date accepted
- Graduation date
Master of Science
- Degree level
Horizontal Directional Drilling (HDD) is one of the most rapidly growing technologies for utility installation under surface obstacles. The rapid growth in application of HDD has not accompanied the same level of development in engineering design procedures and efficient drilling techniques. Rational engineering design and maximized drill rate are of a great value particularly in longer HDD crossings where the project budgets are in the order of millions of dollars and daily delays cost tens of thousands of dollars (Baumert and Allouche, 2002).
To improve predictions of pulling load by current design practices, exact equations for annular flow are derived in this thesis to accurately compute the fluidic drag during HDD operations. Comparisons of the exact solution with the predictions by design procedures such as PRCI and ASTM 1962 reveal that PRCI overestimates the fluidic drag while ASTM F1962 results in a better estimation.
To maximize the rate of penetration and identify underground drilling risks, the concept of Specific Energy (SE) of drilling is proposed here to be used in HDD. SE has been implemented successfully in oil and gas industry as a useful efficiency indicator of drilling operations. To calculate the real SE used by the bit to excavate the material, downhole drilling data should be measured during the process. Utilization of sophisticated downhole measuring tools is not economical in HDD. Therefore, a mechanical model is developed to calculate downhole loads and torques using the result of the previous analysis on the fluidic drag. Finally, an example application of SE in HDD is illustrated in a case study and the SE analysis for surface and downhole conditions are presented.
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
- Citation for previous publication
A version of chapter 3 of this thesis has been submitted to the ASCE Journal of Pipeline Systems Engineering and Practice.A version of chapter 4 of this thesis has been submitted to the ASCE Journal of Construction Engineering and Management.
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