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Wardley Michael Thomas, Taylor Malcolm Roy: Cutter for a rotary drill bit, rotary drill bit with such a cutter, and method of manufacturing such a cutter.. Nl Petroleum Prod, November 25, 1987: EP0246789-A2 (54 worldwide citation)

A cutter, for use in a rotary drill bit, comprises a number of thermally stable polycrystalline diamond elements 21 at least partly embedded in a slug 20 of cemented tungsten carbide, the cemented tungsten carbide having been formed by hot pressing with cobalt. The thermally stable polycrystalline d ...


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Wardley Michael Thomas: Improvements in or relating to cutting elements for rotary drill bits.. Nl Petroleum Prod, October 8, 1986: EP0196777-A1 (54 worldwide citation)

A method of producing a thermally stable polycrystalline diamond compact comprises placing in a high pressure/high temperature apparatus a mass of polycrystalline diamond particles, the mass having a front face and a rear face, and a mass of catalyst metallic material, and then subjecting the masses ...


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Barr John Denzil, Wardley Michael Thomas: Improvements in or relating to rotary drill bits. Nl Petroleum Prod, June 10, 1987: GB2183694-A (34 worldwide citation)

A rotary drill bit for drilling deep holes in subsurface formations comprises a bit body 10 having a shank 14 for connection to a drill string and a plurality of elements 22, 16 mounted on the bit body for cutting, abrading or bearing on the formation being drilled. The bit body includes a fixed str ...


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Barr John Denzil, Wardley Michael Thomas: Improvements in or relating to drill bits.. Nl Petroleum Prod, June 10, 1987: EP0225101-A2 (29 worldwide citation)

A rotary drill bit for drilling deep holes in subsurface formations comprises a bit body (10) having a shank for connection to a drill string and a plurality of elements (16,22) mounted on the bit body (10) for cutting, abrading or bearing on the formation being drilled. The bit body (10) includes a ...


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Matthias Terry Richard: Improvements in or relating to rotary drill bits. Nl Petroleum Prod, November 11, 1987: GB2190120-A (16 worldwide citation)

A rotary drill bit for use in drilling or coring holes in subsurface formations comprises a bit body 10 having a leading face 11 and a gauge region 12, a plurality of preform polycrystalline diamond cutting elements 19,20,21,22 mounted at the leading face of the bit body, and a passage in the bit bo ...


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Barr John Denzil: Rotary drill bits and methods of manufacturing such bits.. Nl Petroleum Prod, September 3, 1986: EP0193361-A1 (15 worldwide citation)

A rotary drill bit comprises a bit body (10) having a shank for connection to a drill string, a plurality of cutting members (14) mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body. The cutting member (14) consists of a c ...


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Wardley Michael Thomas, Taylor Malcolm Roy: Improvements in or relating to rotary drill bits. Nl Petroleum Prod, November 18, 1987: GB2190412-A (14 worldwide citation)

A cutter, for use in a rotary drill bit, comprises a number of thermally stable polycrystalline diamond elements 21 at least partly embedded in a slug 20 of cemented tungsten carbide, the cemented tungsten carbide having been formed by hot pressing with cobalt. The thermally stable polycrystalline d ...


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