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US 5,348,109 AGranted
Cutter assemblies and cutting elements for rotary drill bits
AssigneeCamco Drilling Group Limited
InventorNigel D. Griffin
Life of this patent
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AssigneeCamco Drilling Group Limited
InventorNigel D. Griffin
Estimating the term…
A cutter assembly for a rotary drill bit comprises a preform cutting element mounted on a carrier. The cutting element includes a thin cutting table of polycrystalline diamond, defining a front cutting face and a cutting edge bonded to a less hard substrate which is in turn bonded to the carrier. The substrate and/or the carrier comprises a first portion of high erosion resistance, formed for example from tungsten carbide, and a second portion of lower erosion resistance, formed for example from tungsten metal, which is located in the vicinity of the cutting edge of the cutting element so that, in use, the wear flat is mostly formed in the material of lower erosion resistance.
A cutting element for a rotary drill bit comprising a thin superhard cutting table of polycrystalline diamond material, defining a front cutting face and a cutting edge, bonded to a less hard substrate, wherein the substrate comprises at least a first portion of high erosion resistance and a second portion of lower erosion resistance, the portion of lower erosion resistance having at least a part thereof located adjacent the cutting edge of the superhard cutting table.
A cutter assembly for a rotary drill bit comprising a preform cutting element mounted on a carrier, the cutting element including a thin superhard cutting table of polycrystalline diamond material, defining a front cutting face and a cutting edge, bonded to a less hard substrate which is mounted on the carrier, the carrier comprising a first portion of high erosion resistance and a second portion of lower erosion resistance, the portion of lower erosion resistance being located in the vicinity of the cutting edge of the cutting element, so that, in use, if the wear flat extends into the carrier such wear flat will extend into the lower erosion resistant portion of the carrier.
A cutter assembly for a rotary drill bit comprising a preform cutting element mounted on a carrier, the cutting element including a thin superhard cutting table of polycrystalline diamond material, defining a front cutting face and a cutting edge, bonded to a less hard substrate which is mounted on the carrier, the substrate and carrier each comprising a first portion of high erosion resistance and a second portion of lower erosion resistance, at least parts of the portions of lower erosion resistance being located in the vicinity of the cutting edge of the cutting element.
Dependencies are inferred from the claim text.