公开(公告)号：GB2432601B

公开(公告)日：2010-01-06

申请号：GB0623298

申请日：2006-11-22

Applicant: SMITH INTERNATIONAL

Inventor： MCDONOUGH SCOTT D ,  SINGH AMARDEEP

IPC: E21B10/08

Abstract: A drill bit having cutting elements disposed on a roller cone surface in a non-linear pattern, wherein at least one of the cutting elements is asymmetrical to its axis of orientation. Also, a method for selecting and adjusting a cutting element orientation based on crater profile geometry which results in increased bottom hole coverage.

公开(公告)号：GB2415976B

公开(公告)日：2008-11-12

申请号：GB0513765

申请日：2005-07-05

Applicant: SMITH INTERNATIONAL

Inventor： SINGH AMARDEEP ,  MCDONOUGH SCOTT D

IPC: E21B10/16 ,  E21B10/08 ,  E21B41/00

Abstract: A method for designing a roller cone drill bit having a plurality of cutting elements in a row. The method includes defining a pitch pattern for the plurality of cutting elements such that a first group of adjacent cutting elements are arranged in a first pitch and a second group of adjacent cutting elements are arranged in a second pitch in the row; evaluating the pitch pattern of the plurality of cutting elements in the row; and modifying at least one of the plurality of cutting elements, based on the evaluating the pitch pattern of the plurality of cutting elements.

公开(公告)号：GB2442232A

公开(公告)日：2008-04-02

申请号：GB0623478

申请日：2006-11-24

Applicant: SMITH INTERNATIONAL

Inventor： SINGH AMARDEEP ,  MCDONOUGH SCOTT D ,  GATELL JOSHUA ,  MOSS BRANDON M ,  WHITE ALLEN D ,  BOUDRARE MOHAMMED ,  BAKER BRYCE A ,  CHANDILA PARVEEN K

IPC: E21B10/16

Abstract: A drill bit 10 for drilling through earthen formations and forming a bore hole comprises a bit body 12 and at least one rotatable cone cutter 1,2,3. Various embodiments are disclosed including, a drill bit comprising a plurality of cone cutters, wherein each cone cutter has two arrays of cutter elements spaced apart on separate bands relative to the cone axis, the cutter elements of each array mounted in a plurality of radial positions relative to the bit axis, giving the cutters a staggered or offset pattern. Other embodiments include specific intermesh regions, cutting voids, cutting elements with a skewed axis, overlapping cutting profiles, along with specified ratios for the sizes and numbers of some features.

公开(公告)号：GB2432601A

公开(公告)日：2007-05-30

申请号：GB0623298

申请日：2006-11-22

Applicant: SMITH INTERNATIONAL

Inventor： MCDONOUGH SCOTT D ,  SINGH AMARDEEP

IPC: E21B10/08

Abstract: A drill bit comprising a bit body; at least one roller cone and a plurality of cutting elements wherein at least one of the cutting surfaces of at least one cutting element 121 is asymmetrical with respect to its axis of orientation and wherein the plurality of cutting elements is positioned on the roller cone in a generally non-concentric configuration. The plurality of cutting elements may have different crest directions. Also, a method for selecting and adjusting a cutting element orientation based on crater profile geometry which results in increased bottom hole coverage.

公开(公告)号：CA2257885C

公开(公告)日：2006-06-13

申请号：CA2257885

申请日：1997-06-20

Applicant: SMITH INTERNATIONAL

Inventor： MINIKUS JAMES CARL ,  NESE PER IVAR ,  CAWTHORNE CHRIS EDWARD ,  MCDONOUGH SCOTT D ,  GARCIA GARY EDWARD ,  PORTWOOD GARY RAY

IPC: E21B10/08 ,  E21B10/16 ,  E21B10/52

Abstract: A cutter element that balances maximum gage-keeping capabilities with minimal tensile stress induced damage to cutter elements is disclosed. The cutter elements (150) of the present invention have a non-symmetrical shape and may include a more aggressive cutting profile than conventional cutter elements. In one embodiment, a cutter element is configured such that the inside angle at which its leading face (114) intersects the wear face (112) is less than the inside angle at which is trailing face (118) intersects the wear face (112). This can also be accomplished by providing the cutter element (160) with a relieved wear face (162). In another embodiment of the invention, the surfaces of the present cutter element (500) are curvilinear and the transitions between the leading (514) and trailing (518) faces and the gage face are rounded or contoured. In this embodiment, the leading transition is made sharper than the trailing transition.

公开(公告)号：GB2415976A

公开(公告)日：2006-01-11

申请号：GB0513765

申请日：2005-07-05

Applicant: SMITH INTERNATIONAL

Inventor： SINGH AMARDEEP ,  MCDONOUGH SCOTT D

IPC: E21B10/16 ,  E21B10/08 ,  E21B41/00

Abstract: A roller cone dill bit which has a row, preferably a gage row, of cutting elements formed into a first group of adjacent cutting elements having one pitch pattern and a second group of adjacent cutting elements having a different pitch pattern where at least one cutting element in the first group either has a different geometry, a different material property or a different material type to the cutting elements in the second group. The cutting element is preferably modified because of the expected dull condition of the cutting element. The different geometry is typically any of the crest width, the crest length or the diameter of the cutting element or the cutting element has an asymmetric crest because of a bulk on either the leading or trailing edge. The cutting elements are preferably made of tungsten carbide in a cobalt matrix and the cutting element with a different material type will typically either have less carbide or more cobalt. The different in material property is preferably due to the cutting element having increased hardness or toughness.

公开(公告)号：CA2468662A1

公开(公告)日：2004-11-27

申请号：CA2468662

申请日：2004-05-27

Applicant: SMITH INTERNATIONAL

Inventor： SINGH AMARDEEP ,  BRIETZKE DANIEL W ,  MCDONOUGH SCOTT D

IPC: E21B10/08

Abstract: A method for evaluating a cutting arrangement for a drill bit includes selecting a cutting element arrangement for the drill bit and calculating a score for th e cutting arrangement. This method may be used to evaluate the cutting efficiency of various drill bit designs. In one example, this method is used to calculate a score for an arrangement based on a comparison of an expected bottomhole pattern for the arrangement with a preferred bottomhole pattern. The use of this method has lead to roller cone drill bit designs that exhibit reduce tracking over prior art bits.

公开(公告)号：GB2327443B

公开(公告)日：2001-12-19

申请号：GB9814162

申请日：1998-06-30

Applicant: SMITH INTERNATIONAL

Inventor： LOCKSTEDT ALAN W ,  PORTWOOD GARY RAY ,  MCDONOUGH SCOTT D

IPC: E21B10/16 ,  E21B10/52 ,  E21B10/56 ,  E21B10/567

公开(公告)号：GB2324556B

公开(公告)日：2001-06-06

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

IPC: E21B10/16 ,  E21B10/50

公开(公告)号：GB2330605A

公开(公告)日：1999-04-28

申请号：GB9826997

申请日：1997-06-20

Applicant: SMITH INTERNATIONAL

Inventor： PORTWOOD GARY RAY ,  MCDONOUGH SCOTT D ,  CISNEROS DENNIS

IPC: E21B10/16 ,  E21B10/52 ,  E21B10/08

Abstract: A cutter element having a substantially flat wear face and leading compression and trailing tension zones, wherein the leading compression zone is sharper than the trailing tension zone. 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, but can also be applied to cutters in other rows that primarily ream the borehole wall and cooperatively cut the borehole corner. The present cutter element can be constructed so as to have either 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.