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公开(公告)号：GB2471020B
公开(公告)日：2011-05-11
申请号：GB201009778
申请日：2008-06-03
Applicant: SMITH INTERNATIONAL
Inventor： DURAIRJAN BALA , HOFFMASTER CARL M , DOUGLAS CHARLES H S , CISNEROS DENNIS
IPC: E21B10/43
Abstract: A drill bit for drilling a borehole comprises a bit body having a bit face. In addition, the drill bit comprises a plurality of primary blades. Further, the drill bit comprises a plurality of primary cutter elements mounted to each primary blade and at least one backup cutter element mounted to each primary blade. Still further, the drill bit comprises a plurality of secondary blades. Moreover, the drill bit comprises a plurality of primary cutter elements mounted to each secondary blade. The ratio of the total number of backup cutter elements mounted to the plurality of primary blades to the total number of backup cutter elements mounted to the plurality of secondary blades is greater than 2.0. Each backup cutter element on each primary blade has substantially the same radial position as one of the primary cutter elements on the same primary blade.
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公开(公告)号：GB2471020A8
公开(公告)日：2011-02-09
申请号：GB201009778
申请日：2008-06-03
Applicant: SMITH INTERNATIONAL
Inventor： DURAIRAJAN BALA , HOFFMASTER CARL M , DOUGLAS CHARLES H S , CISNEROS DENNIS
IPC: E21B10/43
Abstract: A drill bit for drilling a borehole comprises a bit body having a bit face. In addition, the drill bit comprises a plurality of primary blades. Further, the drill bit comprises a plurality of primary cutter elements mounted to each primary blade and at least one backup cutter element mounted to each primary blade. Still further, the drill bit comprises a plurality of secondary blades. Moreover, the drill bit comprises a plurality of primary cutter elements mounted to each secondary blade. The ratio of the total number of backup cutter elements mounted to the plurality of primary blades to the total number of backup cutter elements mounted to the plurality of secondary blades is greater than 2.0. Each backup cutter element on each primary blade has substantially the same radial position as one of the primary cutter elements on the same primary blade.
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公开(公告)号：GB2462206A
公开(公告)日：2010-02-03
申请号：GB0913701
申请日：2008-06-03
Applicant: SMITH INTERNATIONAL
Inventor： DURAIRAJAN BALA , HOFFMASTER CARL M , DOUGLAS CHARLES H S , CISNEROS DENNIS
IPC: E21B10/43
Abstract: A drill bit (10) for drilling a borehole comprises a bit body (12) having a bit face (20). In an embodiment, the drill bitJ10) comprises a plurality of primary blades (31,32,33) and a plurality of primary cutter elements (40) mounted to each primary blade (31,32,33) and at least one backup cutter element (50) mounted to each primary blade (31,32,33). The drill bit (10) also comprises a plurality of secondary blades (34,35,36) and a plurality of primary cutter elements (40) mounted to each secondary blade (34,35,36). The ratio of the total number of backup cutter elements (50) mounted to the plurality of primary blades (31,32,33) to the total number of backup cutter elements mounted to the plurality of secondary blades (34,35,36) is greater than 2. Each backup cutter element (50) on each primary blade (31,32,33) has substantially the same radial position as one of the primary cutter elements (40) on the same primary blade (31,32,33).
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公开(公告)号：GB2438053B
公开(公告)日：2009-05-06
申请号：GB0708446
申请日：2007-05-01
Applicant: SMITH INTERNATIONAL
Inventor： CISNEROS DENNIS
Abstract: A drill bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body having a bit face comprising a cone region, a shoulder region, and a gage region. In addition, the bit comprises at least one primary blade disposed on the bit face, wherein the at least one primary blade extends into the cone region. Further, the bit comprises a plurality of primary cutter elements mounted on the at least one primary blade in the cone region. Still further, the bit comprises a plurality of backup cutter elements mounted on the at least one primary blade in the cone region, wherein the at least one primary blade has a cone backup cutter density and a shoulder backup cutter density, and wherein the cone backup cutter density of the at least one primary blade is greater than the shoulder backup cutter density of the at least one primary blade.
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公开(公告)号：GB2324556A
公开(公告)日：1998-10-28
申请号：GB9807159
申请日：1998-04-02
Applicant: SMITH INTERNATIONAL
Inventor： CISNEROS DENNIS , MCDONOUGH SCOTT D , MINIKUS JAMES C , CAWTHORNE CHRIS E
Abstract: A tooth, particularly suited for use in a rolling cone bit, includes a root region (83), a cutting tip (86) spaced from the root region (83) and a gage facing surface therebetween. The gage facing surface includes a knee (90) and is configured such that the cutting tip (86) is maintained at a position off the gage curve (99). So positioned, the cutting tip (86) is freed from having to perform any substantial cutting duty in the corner on the borehole corner, and instead may be configured and optimised for bottom hole cutting duty. The knee (90) on the gage facing surface is configured and positioned so as to serve primarily to cut the borehole wall. It is preferred that the knee (90) be positioned off gage, but that it be closer to the gage curve (99) than the cutting tip (86).
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Patent Agency Ranking
公开(公告)号：SE9800295L
公开(公告)日：1998-02-10
申请号：SE9800295
申请日：1998-02-02
Applicant: SMITH INTERNATIONAL
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公开(公告)号：AU3402997A
公开(公告)日：1998-01-07
申请号：AU3402997
申请日：1997-06-20
Applicant: SMITH INTERNATIONAL
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公开(公告)号：CA2257932A1
公开(公告)日：1997-12-24
申请号：CA2257932
申请日：1997-06-20
Applicant: SMITH INTERNATIONAL
Inventor： MCDONOUGH SCOTT D , PORTWOOD GARY RAY , CISNEROS DENNIS
Abstract: A cutter element (65) having a substantially flat wear face (63) and leading compression (64) and trailing tension (66) zones, wherein the leading compression zone (64) is sharper than the trailing tension zone (66). Sharpness is defined as either a smaller inside angle at the intersection of a pair of planes or as a smaller radius of curvature. The cutter element of the present invention experiences reduced stress on its trailing portion in the direction of cutting movement and therefore is less subject to extreme impact damage and cyclic fatigue. The present invention can be applied with particular advantage to heel row cutters (60), but can also be applied to cutters in other rows that primarily ream the borehole corner. The present cutter element can be constructed so as to have a positive or negative rake angle at its leading compression zone, or to have any of a variety of shapes, depending on the characteristics of the formation in which it is to be used.
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公开(公告)号：GB2450222B
公开(公告)日：2010-05-12
申请号：GB0810112
申请日：2008-06-03
Applicant: SMITH INTERNATIONAL
Inventor： DURAIRAJAN BALA , HOFFMASTER CARL M , DOUGLAS CHARLES H S , CISNEROS DENNIS
IPC: E21B10/43
Abstract: A drill bit for drilling a borehole comprises a bit body having a bit face. In addition, the drill bit comprises a plurality of primary blades. Further, the drill bit comprises a plurality of primary cutter elements mounted to each primary blade and at least one backup cutter element mounted to each primary blade. Still further, the drill bit comprises a plurality of secondary blades. Moreover, the drill bit comprises a plurality of primary cutter elements mounted to each secondary blade. The ratio of the total number of backup cutter elements mounted to the plurality of primary blades to the total number of backup cutter elements mounted to the plurality of secondary blades is greater than 2.0. Each backup cutter element on each primary blade has substantially the same radial position as one of the primary cutter elements on the same primary blade.
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公开(公告)号：GB2438053A
公开(公告)日：2007-11-14
申请号：GB0708446
申请日：2007-05-01
Applicant: SMITH INTERNATIONAL
Inventor： CISNEROS DENNIS
Abstract: A drill bit 10 has a bit body 12 having a bit face 20 and at least one primary blade 31,32 disposed on the bit face, wherein the at least one primary blade extends into a cone or centre region of the bit face. Further, the bit has a plurality of backup cutter elements 50 mounted on the primary blade in the cone region. The cone backup cutter density of the primary blade is greater than the shoulder backup cutter density of the blade. The drill bit may also have a gage backup cutter density, wherein the cone backup cutter density is greater than the gage backup cutter density. Also disclosed is a drill bit in which the secondary blades begin at the outermost radius of the central cone region.
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