Pipelines 2020
Simplified Application of the Delft Method to Estimate Maximum Allowable Annular Pressure in HDD
Publication: Pipelines 2020
ABSTRACT
The Delft method has been broadly used for inadvertent return (IR) assessment in the horizontal directional drilling (HDD) industry. Prediction of the maximum allowable mud pressure, Pmax, using the Delft equation requires multiple geotechnical parameters as inputs; however, this often poses challenges for practitioners. Since there is no apparent guideline established for the extraction of geotechnical parameters from site investigation data, the determination of Delft equation inputs becomes subjective, which ultimately results in the Pmax prediction being unsystematic. Instead of converting site investigation data—such as the N-value from the standard penetration test (SPT)—into laboratory-based geotechnical parameters, a direct method of determination of Pmax from the N-value is considered to be preferable. In this paper, a guideline for predicting Pmax using the N-value is presented. Multiple correlations between N-values and geotechnical parameters have been evaluated, and these are introduced into Delft equation using a conservative margin of error.
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Pipelines 2020
Pages: 559 - 573
Editors: J. Felipe Pulido, OBG, Part of Ramboll and Mark Poppe, Brown and Caldwell
ISBN (Online): 978-0-7844-8320-6
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© 2020 American Society of Civil Engineers.
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Published online: Aug 6, 2020
Published in print: Aug 6, 2020
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