Bit-rock interaction in rotary drilling: numerical and experimental study

Reyes Nava, Rosana A. (2017) Bit-rock interaction in rotary drilling: numerical and experimental study. Masters thesis, Memorial University of Newfoundland.

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This investigation describes the dynamic model of a rotary drilling system equipped with a PDC bit. Torsional and axial dynamics are modeled separately with the bond graph technique and coupled is given by a bit-rock interaction model that considers cutting and friction components at the bit cutters. The cases for contact loss are analyzed and included as numerical functions to account for bit-bounce and stick-slip during drilling. Cosimulation of the drillstring and bit-rock models is proposed to simplify the numerical implementation. Verification confirmed that the model was captured with sufficient accuracy and yields predictable results for known inputs. A methodology for bit-rock parameter acquisition is suggested. Simulation of a real drilling setup was performed and validated against experimental tests. For the analyzed ranges, simulations were in agreement with experimental results. This shows that a close prediction of the drilling response of a PDC bit is possible with the considered model.

Item Type: Thesis (Masters)
Item ID: 12523
Additional Information: Includes bibliographical references (pages 94-100).
Keywords: Drilling, Simulation, Bit-rock, Vibration, Stick-slip
Department(s): Engineering and Applied Science, Faculty of
Date: May 2017
Date Type: Submission
Library of Congress Subject Heading: Boring machinery -- Mathematical models; Bits (Drilling and boring) -- Mathematical models

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