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| Abstract No.: |
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Scheduled at:
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Tuesday, May 04, 2010, Hullet Room 10:40 AM
Wear Protection 2
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| Title: |
Improved hardfacing for drill bits and drilling tools
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| Authors: |
Albert Sue* / National Oilwell Varco, USA
Harold Sreshta / National Oilwell Varco, USA
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| Abstract: |
New flame spray hardfacing, DSH (DuraShell® Steel Hardfacing), is developed to improve thermal conductivity, abrasion wear and erosion resistance for subterranean drilling application. The materials consist of spherical cast WC/WC2 and Ni-Si-B alloy powders. The hardfacing compositions are tailored for various processes such as flame spray torch, plasma transferred arc and laser cladding. Typically, the hardfacing comprises hard tungsten carbide particles uniformly distributed in a tough Ni-alloy matrix. The hardness of WC/WC2 exceeds 2300 Hv.3 and Ni-alloy matrix varies from about 400 to 700 Hv.3.
High stress and low stress abrasion resistances of these hardfacing materials were characterized and compared to the conventional cast WC/WC2 and Ni-Cr-Si-B-Fe hard coating. The increase in thermal, wear, and erosion resistances of the hardfacing improve durability of PDC steel body bit and large drilling tools and improve drilling economics. Several case studies of various hardfacing depositions on drill bits and drilling tools are described. Wear and erosion of these tools are characterized and discussed.
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