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    1.
    发明专利
    未知

    公开(公告)号：DE60117435T2

    公开(公告)日：2006-10-12

    申请号：DE60117435

    申请日：2001-07-18

    Applicant: SMITH INTERNATIONAL

    Inventor： TRUAX DAVID ,  BEATON TIMOTHY PAUL

    IPC: E21B10/46 ,  E21B10/26 ,  E21B10/56 ,  E21B17/10

    Abstract: A drill bit including a bit body and a plurality of blades formed in the bit body. The blades are formed, at least in part, from a base matrix material that on one embodiment is impregnated with abrasive particles. One side of the bit is formed, with respect to its axis of rotation, to a smaller radius than the opposite side of the bit. The asymmetry of the bit enables the bit to drill a larger diameter hole than a pass through diameter of the bit. The opposite side defines a contact angle between the bit and a formation. In one embodiment, the contact angle is at least 140 degrees.. In one embodiment, a plurality of inserts may be located on the blades to provide gage protection. In another embodiment, the bit may also include a gage sleeve that helps keep the bit stabilized in the wellbore.

    BI-CENTERED DRILL BIT HAVING IMPROVED DRILLING STABILITY, MUD HYDRAULICS AND RESISTANCE TO CUTTER DAMAGE
    2.
    发明专利
    BI-CENTERED DRILL BIT HAVING IMPROVED DRILLING STABILITY, MUD HYDRAULICS AND RESISTANCE TO CUTTER DAMAGE 未知

    公开(公告)号：CA2312272C

    公开(公告)日：2006-10-03

    申请号：CA2312272

    申请日：2000-06-23

    Applicant: SMITH INTERNATIONAL

    Inventor： TRUAX DAVID ,  BEATON TIMOTHY P

    IPC: E21B10/26 ,  E21B10/46

    Abstract: A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions . In one aspect, the pilot blades form a section having length along the bit axis less than about 80 percent of a diameter of the section. In another aspect, selected pilot blades and corresponding reaming blades are formed into single spiral structures. In another aspect, shapes a nd positions of the blades and inserts are selected so that lateral forces exerted by the reamin g and the pilot sections are balanced as a single structure. Lateral forces are preferably balanced t o within 10 percent of the total axial force on the bit. In another aspect, the center of mass of t he bit is located less than about 2.5 percent of the diameter of the bit from the axis of rotation. In another aspect, jets are disposed in the reaming section oriented so that their axes are within about 30 degrees of normal to the axis of the bit. In another aspect, the reaming blades are shaped to conform to the radially least extensive, from the longitudinal axis, of a pass-through circle or a drill circle, so the cutters on the reaming blades drill at the drill diameter, without contact to the cutters on the reaming blades when the bit passes through an openinghaving about the pass-through diameter.

    8.
    发明专利
    未知

    公开(公告)号：DE60117435D1

    公开(公告)日：2006-04-27

    申请号：DE60117435

    申请日：2001-07-18

    Applicant: SMITH INTERNATIONAL

    Inventor： TRUAX DAVID ,  BEATON TIMOTHY PAUL

    IPC: E21B10/46 ,  E21B10/26 ,  E21B10/56 ,  E21B17/10

    Abstract: A drill bit including a bit body and a plurality of blades formed in the bit body. The blades are formed, at least in part, from a base matrix material that on one embodiment is impregnated with abrasive particles. One side of the bit is formed, with respect to its axis of rotation, to a smaller radius than the opposite side of the bit. The asymmetry of the bit enables the bit to drill a larger diameter hole than a pass through diameter of the bit. The opposite side defines a contact angle between the bit and a formation. In one embodiment, the contact angle is at least 140 degrees.. In one embodiment, a plurality of inserts may be located on the blades to provide gage protection. In another embodiment, the bit may also include a gage sleeve that helps keep the bit stabilized in the wellbore.

    Multiple radius cutting element
    9.
    发明专利
    Multiple radius cutting element 未知

    公开(公告)号：GB2405167A

    公开(公告)日：2005-02-23

    申请号：GB0418716

    申请日：2004-08-23

    Applicant: SMITH INTERNATIONAL

    Inventor： KESHAVAN MADAPUSI K ,  AZAR MIKE ,  TRUAX DAVID

    IPC: E21B10/56 ,  E21B10/567 ,  E21B10/46

    Abstract: A cutting element includes a mounting body 110 and an ultra-hard material layer 114 formed over the body. The ultra hard material and corresponding periphery of the body have a profile formed by discreet curved sections 28, each section 30, 32 comprising a single radius of curvature R1, R2 along a plane generally perpendicular to the longitudinal axis of the cutter element. Preferably adjacent curvature sections have different radii, end define the entire profile of the element. Also disclosed is a drill bit characterised by the differing diameter curved surfaces of first and second cutting elements, and a drill bit characterised by the differing diameter pockets for the cutting elements.

    ROLLER CONE DRILL BIT HAVING DESIGNED WALK CHARACTERISTICS
    10.
    发明专利
    ROLLER CONE DRILL BIT HAVING DESIGNED WALK CHARACTERISTICS 未知

    公开(公告)号：CA2417307A1

    公开(公告)日：2003-07-24

    申请号：CA2417307

    申请日：2003-01-23

    Applicant: SMITH INTERNATIONAL

    Inventor： TRUAX DAVID ,  ROCK DOUGLAS ,  MENSA-WILMOT GRAHAM

    IPC: E21B7/08 ,  E21B10/16 ,  E21B10/08 ,  B23P15/28

    Abstract: A roller cone drill bit having selected left hand walk is disclosed. The bit includes a bit body adapted to couple to a drill string, and a plurality of legs depending from the bit body. Each leg has a roller cone rotatably mounted thereon. Each cone includes a plurality of cutting elements thereon. At least one cone has a nose point of its profile displaced radially inward with respect to a nose point of the profile of the other cones. A roller cone drill bit having selected right hand walk is also disclosed. The bit include a bit body adapted to couple to a drill string, and a plurality of legs depending from the bit body. Each leg has a roller cone rotatably mounted thereon, each cone including a plurality of cutting elements thereon defining a profile. At least one cone has a nose point of the profile displaced radially outward with respect to a nose point of the profile of the other cones.

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