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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29122


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10009680
An Automated Approach to the Nozzle Configuration of Polycrystalline Diamond Compact Drill Bits for Effective Cuttings Removal
Abstract:
Polycrystalline diamond compact (PDC) drill bits are extensively used in the oil and gas industry as well as the mining industry. Industry engineers continually improve upon PDC drill bit designs and hydraulic conditions. Optimized injection nozzles play a key role in improving the drilling performance and efficiency of these ever changing PDC drill bits. In the first part of this study, computational fluid dynamics (CFD) modelling is performed to investigate the hydrodynamic characteristics of drilling fluid flow around the PDC drill bit. An Open-source CFD software – OpenFOAM simulates the flow around the drill bit, based on the field input data. A specifically developed console application integrates the entire CFD process including, domain extraction, meshing, and solving governing equations and post-processing. The results from the OpenFOAM solver are then compared with that of the ANSYS Fluent software. The data from both software programs agree. The second part of the paper describes the parametric study of the PDC drill bit nozzle to determine the effect of parameters such as number of nozzles, nozzle velocity, nozzle radial position and orientations on the flow field characteristics and bit washing patterns. After analyzing a series of nozzle configurations, the best configuration is identified and recommendations are made for modifying the PDC bit design.
Digital Object Identifier (DOI):

References:

[1] Akin J. et al. "New nozzle hydraulics increase ROP for PDC and rock bits" SPE/IADC drilling conference, pp69-78.
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[4] Zhang H. “Research on the Bottom Hole Flow Field of PDC Bit”, Advances in Petroleum Exploration and Development, Vol. 10, No. 2, 2015, pp. 103-107.
[5] Pletcher, R.H., Tannehill, J.C., and Anderson, D.A. 2013. Computational Fluid Mechanics and Heat Transfer, third edition, 3-9, 66-82. Boca Raton, Florida: CRC Press.
[6] Gmsh: a three-dimensional Finite element mesh generator with built-in pre- and post-processing facilities Int. J. Numer. Meth. Engng 2009; 0:1-24
[7] OpenFOAM: The Open Source CFD Toolbox, User Guide V1706, 2017.
[8] ParaView User guide: https://www.paraview.org/paraview-guide.
[9] Menter, F. 1993. Zonal Two Equation k-w Turbulence Models for Aerodynamic Flows. AIAA. 93-2906.
[10] ANSYS 2017. ANSYS Fluent Theory Guide. Release 17.0. ANSYS, Inc.
[11] Adam J. “Proceedings of the 4th International Conference on Fluid Flow, Heat and Mass Transfer” (FFHMT’17), Toronto, Canada - August 21 - 23, 2017, Paper No. 170.
[12] Hariharan, P., Azar, J. 1996. PDC bit hydraulics design, profile are key to reducing balling. Oil and Gas Journal, 94(50), 58-63.

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