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Número de publicaciónEP0225082 A3
Tipo de publicaciónSolicitud
Número de solicitudEP19860308791
Fecha de publicación27 Jul 1988
Fecha de presentación12 Nov 1986
Fecha de prioridad16 Nov 1985
También publicado comoEP0225082A2
Número de publicación1986308791, 86308791, 86308791.2, EP 0225082 A3, EP 0225082A3, EP-A3-0225082, EP0225082 A3, EP0225082A3, EP19860308791, EP86308791
InventoresPeter John Comber, John Fuller
SolicitanteNl Petroleum Products Limited
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos:  Espacenet, Registro europeo de patentes
Improvements in or relating to rotary drill bits
EP 0225082 A3
A rotary drill bit comprises a bit body (10) having a leading face (11) and a gauge region (12), a plurality of blades (13) extending across the leading face (11) of the bit body (10), a plurality of cutting elements (8) mounted along each blade, an exit channel (18) in the gauge region (12) of the bit body (10) between each pair of adjacent blades (13), a plurality of nozzles (19a,19b,19c,19d) in the leading face (11) of the bit, each nozzle having a central axis (20) which also forms the central axis of the jet of drilling fluid emerging from the nozzle, and a passage (6) in the bit body (10) for supplying drilling fluid to said openings (19a-19d). At least one nozzle is located between each pair of adjacent blades (13), and the nozzles are inclined at different angles, or are otherwise differently located, so that, in use, the central axes of nozzles between different pairs of adjacent blades (13) intersect the surface of the formation (21) being drilled at different distances from the axis of rotation of the bit, so that the jets of drilling fluid emerging from the nozzles, between them, sweep over the whole of the surface of the formation as the bit rotates.
Descripción  disponible en
Reclamaciones  disponible en
Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
EP0043609A1 *12 Jun 198113 Ene 1982Shell Internationale Research Maatschappij B.V.Rotary bit with jet nozzles
EP0140676A2 *25 Oct 19848 May 1985Reed Tool Company LimitedImprovements in or relating to rotary drill bits
EP0146252A2 *5 Nov 198426 Jun 1985Flow Industries Inc.Leak-proof, high pressure, high velocity, fluid jet cutting nozzle assembly
US3112803 *2 Ene 19623 Dic 1963Jersey Prod Res CoDiamond drill bit
US4499958 *29 Abr 198319 Feb 1985Strata Bit CorporationDrag blade bit with diamond cutting elements
Clasificación internacionalE21B10/60, E21B10/567, E21B10/56
Clasificación cooperativaE21B10/567, E21B10/602
Clasificación europeaE21B10/60B, E21B10/567
Eventos legales
10 Jun 1987AKDesignated contracting states:
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Designated state(s): BE CH DE FR LI NL SE
27 Jul 1988AKDesignated contracting states:
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Designated state(s): BE CH DE FR LI NL SE
2 Nov 198918DDeemed to be withdrawn
Effective date: 19890128
8 Ago 2007RIN1Inventor (correction)
Inventor name: FULLER, JOHN
Inventor name: COMBER, PETER JOHN