Stress related placement of engineered superabrasive cutting elements on rotary drag bits
AssigneeBaker Hughes Incorporated
InventorsGordon A. Tibbitts, Evan C. Turner
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Abstract
A drill bit employing selective placement of cutting elements engineered to accommodate differing loads such as are experienced at different locations on the bit crown. A method of bit design and cutting element design to achieve optimal placement for maximum ROP and bit life of particularly suitable cutting elements for a given bit profile and design, as well as anticipated formation characteristics and other downhole parameters.
Claims10
A method of designing a rotary drill bit for drilling a subterranean formation, comprising:
- selecting a bit body design, including profile;
- mathematically simulating a rock formation to be drilled with said selected bit profile;
- determining the magnitude of strength of said simulated rock formation in at least one location adjacent said selected bit profile for a proposed set of drilling parameters;
- and
- selecting at least one cutting element for placement on said selected bit profile at said at least one location, said at least one cutting element possessing a structure adapted to penetrate said simulated rock formation under said proposed set of drilling parameters substantially without damage.
A method of designing a rotary drill bit for drilling subterranean formations, comprising:
- selecting a bit body design, including profile;
- mathematically simulating the magnitude and direction of resultant loading at a plurality of locations on said profile by considering at least one load vector at each of said locations, said load vector having a magnitude and having a direction selected from a group of load vector directions including at least one of the axial, radial and tangential directions;
- and
- selecting a cutting element for disposition on said profile at least on one of said plurality of locations, wherein said selected cutting element is specifically structured to withstand said resultant loading at that location.
Dependencies are inferred from the claim text.