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    CUTTER ELEMENT ADAPTED TO WITHSTAND TENSILE STRESS
    1.
    发明申请
    CUTTER ELEMENT ADAPTED TO WITHSTAND TENSILE STRESS 审中-公开
    切割元件适应耐受拉伸应力

    公开(公告)号：WO9748874A2

    公开(公告)日：1997-12-24

    申请号：PCT/US9710778

    申请日：1997-06-20

    Applicant: SMITH INTERNATIONAL

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

    IPC: E21B10/16 ,  E21B10/52 ,  E21B

    CPC classification number: E21B10/16 ,  E21B10/52

    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.

    Abstract translation: 刀片元件具有基本平坦的磨损面和引导的压缩和牵引张力区域，其中前导压缩区域比拖拉区域更尖锐。 清晰度被定义为在一对平面的交点处较小的内角或较小的曲率半径。 本发明的切割元件在切割方向上的尾部受到较小的应力，因此受到极大的冲击损伤和循环疲劳的影响。 本发明可以特别有利于后跟行切割机，但是也可以应用于其它行中的切割器，其主要是钻孔壁并协同切割钻孔角。 本刀片元件可以被构造为在其前导压缩区域具有正或负前角，或者根据要使用的地层的特性，具有各种形状。

    NON-SYMMETRICAL STRESS-RESISTANT ROTARY DRILL BIT CUTTER ELEMENT
    2.
    发明申请
    NON-SYMMETRICAL STRESS-RESISTANT ROTARY DRILL BIT CUTTER ELEMENT 审中-公开
    非对称耐应力旋转钻头切割元件

    公开(公告)号：WO9748873A2

    公开(公告)日：1997-12-24

    申请号：PCT/US9710772

    申请日：1997-06-20

    Applicant: SMITH INTERNATIONAL

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

    IPC: E21B10/16 ,  E21B10/52 ,  E21B

    CPC classification number: E21B10/52 ,  E21B10/16

    Abstract: A cutter element that balances maximum gage-keeping capabilities with minimal tensile stress induced damage to the cutter elements is disclosed. The cutter elements 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 intersects the wear face is less than the inside angle at which is trailing face intersects the wear face. This can also be accomplished by providing the cutter element with a relieved wear face. In another embodiment of the invention, the surfaces of the present cutter element are curvilinear and the transitions between the leading and trailing faces and the gage face are rounded, or contoured. In this embodiment, the leading transition is made sharper than the trailing transition by configuring it such that the leading transition has a smaller radius of curvature than the radius of curvature of the trailing transition. In another embodiment, the cutter element has a chamfered trailing edge such that the leading transition of the cutter element is sharper than its trailing transition. In another embodiment, the cutter element has a chamfered or contoured trailing edge in combination with a canted wear face. In still another embodiment, the cutter element includes a positive rake angle on its leading edge.

    Abstract translation: 公开了一种用于平衡最大保持能力和对刀具元件的最小拉伸应力引起的损伤的切割元件。 本发明的切割元件具有非对称的形状，并且可以包括比常规切割元件更具侵蚀性的切割轮廓。 在一个实施例中，切割元件构造成使得其前表面与磨损面相交的内角小于后表面与磨损面相交的内角。 这也可以通过提供切割器元件具有缓解的磨损面来实现。 在本发明的另一个实施例中，本刀片元件的表面是曲线形的，并且前表面和后表面之间的过渡是圆形或轮廓。 在该实施例中，通过对其进行配置，引导转变比尾随转换更尖锐，使得前导转换的曲率半径比后跟转换的曲率半径小。 在另一个实施例中，切割器元件具有倒角后缘，使得切割器元件的前导过渡比其拖尾过渡更尖锐。 在另一个实施例中，切割器元件具有与斜面磨损面组合的倒角或轮廓后缘。 在另一个实施例中，切割器元件在其前缘上包括正的前角。

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