公开(公告)号：US06651758B2

公开(公告)日：2003-11-25

申请号：US09860936

申请日：2001-05-18

申请人： Ying Xiang ,  James Carl Minikus

发明人： Ying Xiang ,  James Carl Minikus

IPC分类号： E21B1008

CPC分类号： E21B10/16 ,  E21B10/52

摘要： An earth-boring bit for drilling a borehole comprises a bit body having a bit axis, at least two rolling cone cutters rotatably mounted on the bit body, a plurality of inner row cutter elements positioned on at least one cone cutter in a first inner row, a plurality of gage-cutting cutter elements positioned in a first fanned-gage row on a first one of the one cutters, and a plurality of gage-cutting cutter elements positioned in a second fanned-gage row on a second one of the one cutters, wherein the gage-cutting cutter elements on the bit define a gage curve and cutter elements in the first fanned-gage row and the second fanned-gage row contact the gage curve at different points. In one embodiment, each cutter element has an extension, and the extensions of the uppermost fanned-gage row cutter element and the first inner row cutter element define a step distance such that the ratio of the step distance to the extension of the first inner row cutter element is greater than 0.5. Alternatively, the first and second fanned-gage rows are positioned to have different oversize angles, positioned such that the ratio of the diameter of the largest fanned-gage row cutter element to the diameter of the first inner row cutter elements is not greater than 0.75, or positioned such that the lowermost fanned-gage row contains more cutter elements than any other fanned-gage row.

公开(公告)号：US06510909B2

公开(公告)日：2003-01-28

申请号：US10105748

申请日：2002-03-25

申请人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

发明人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

IPC分类号： E21B1016

CPC分类号： E21B10/5673 ,  E21B10/16 ,  E21B10/52

摘要： A rolling cone bit includes at least one cone cutter having a gage row of cutter elements and a first inner row of near but off-gage cutter elements that are positioned so as to divide the sidewall and bottom hole cutting duty so as to enhance bit durability, maintain borehole diameter and improve ROP. The off-gage distance of the first inner row of cutter elements is defined for various bit sizes to optimize the division of cutting duty. The distance that the first inner row of cutter elements are off-gage may be constant for all the cones on the bit or may be varied among the various cones to balance the durability and wear characteristics on all the cones of the bit.

公开(公告)号：US5967245A

公开(公告)日：1999-10-19

申请号：US879874

申请日：1997-06-20

申请人： Gary Edward Garcia ,  Gary Ray Portwood ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne ,  Madapusi K. Keshavan

发明人： Gary Edward Garcia ,  Gary Ray Portwood ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne ,  Madapusi K. Keshavan

IPC分类号： E21B10/16 ,  E21B10/52 ,  E21B17/10

CPC分类号： E21B17/1092 ,  E21B10/16 ,  E21B10/52

摘要： A rolling cone bit includes a cone cutter having a gage row and an adjacent nestled gage row of cutter elements that are positioned on gage so as to divide or share the borehole corner cutting duty. The wear resistance, hardness, toughness and shape of the cutter elements in the adjacent rows are optimized depending upon the type of cutting the respective rows perform, the characteristics of the formation being drilled and the drilling techniques being employed. In most applications, the nestled gage cutter elements will have cutting surfaces that are more wear resistant or harder than the cutting surfaces of the gage cutter elements which experience more bottom hole duty. The nestled gage cutter elements engage the borehole wall with a negative rake angle for increased durability. Preferably, the nestled gage cutter elements have continuously contoured and non-shearing cutting surfaces.

摘要翻译： 滚动锥头包括锥形切割器，该切割器具有定位在量规上的量具行和相邻的切割器元件排列，以分割或共享钻孔角切削功能。 相邻行中的切割器元件的耐磨性，硬度，韧性和形状根据相应行执行的切割类型，被钻孔的特征和所采用的钻孔技术而优化。 在大多数应用中，配套的量具切割器元件将具有比经验更多的底坑功能的量规切割器元件的切割表面更耐磨或更硬的切割表面。 套管式切割器元件与具有负前角的钻孔壁接合以提高耐久性。 优选地，所述定位的量具切割器元件具有连续成型和非剪切切割表面。

公开(公告)号：US06390210B1

公开(公告)日：2002-05-21

申请号：US08630517

申请日：1996-04-10

申请人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

发明人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

IPC分类号： E21B1016

CPC分类号： E21B10/5673 ,  E21B10/16 ,  E21B10/52

摘要： A rolling cone bit includes at least one cone cutter having a gage row of cutter elements and a first inner row of near but off-gage cutter elements that are positioned so as to divide the sidewall and bottom hole cutting duty so as to enhance bit durability, maintain borehole diameter and improve ROP. The off-gage distance of the first inner row of cutter elements is defined for various bit sizes to optimize the division of cutting duty. The distance that the first inner row of cutter elements are off-gage may be constant for all the cones on the bit or may be varied among the various cones to balance the durability and wear characteristics on all the cones of the bit.

公开(公告)号：US5833020A

公开(公告)日：1998-11-10

申请号：US667758

申请日：1996-06-21

申请人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

发明人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Dennis Cisneros ,  Chris Edward Cawthorne

IPC分类号： E21B10/16 ,  E21B10/52 ,  E21B10/56 ,  E21B10/567 ,  E21B10/50

CPC分类号： E21B10/5673 ,  E21B10/16 ,  E21B10/52

摘要： A rolling cone bit includes a cone cutter having a pair of adjacent rows of cutter elements that are positioned so as to divide the sidewall and bottom hole cutting duty. The wear resistance, hardness and toughness of the cutter elements in the adjacent rows are optimized depending upon the type of cutting the respective rows perform. In most applications, the cutter elements experiencing more sidewall cutting will have cutting surfaces that are more wear resistant or harder than the cutting surfaces of cutter elements in rows experiencing more bottom hole duty. Likewise, the cutter elements exposed to more bottom hole duty will generally be tougher than those experiencing substantial sidewall cutting. The material enhancements include varying the grades of tungsten carbide used in the cutter elements and by selectively employing layers of super abrasives, such as PCD or PCBN. The cutter elements may be either inserts or steel teeth.

摘要翻译： 滚动锥头包括具有一对相邻的切割器元件排的锥形切割器，该切割器元件被定位成将侧壁和底部孔切割功能分开。 相邻行中的切割元件的耐磨性，硬度和韧性根据各行的切割类型进行优化。 在大多数应用中，经历更多侧壁切割的切割器元件将具有比经历更多底坑功能的行中的切割器元件的切割表面更耐磨或更硬的切割表面。 同样地，暴露于更多的底孔负荷的切割元件通常比那些经历大量侧壁切割的切割元件更坚硬。 材料增强包括改变切削元件中使用的碳化钨等级，并且选择性地使用超级磨料层，例如PCD或PCBN。 切割元件可以是插入件或钢齿。

公开(公告)号：US6059054A

公开(公告)日：2000-05-09

申请号：US879872

申请日：1997-06-20

申请人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Chris Edward Cawthorne ,  Scott D. McDonough

发明人： Gary Ray Portwood ,  Gary Edward Garcia ,  James Carl Minikus ,  Per Ivar Nese ,  Chris Edward Cawthorne ,  Scott D. McDonough

IPC分类号： E21B10/16 ,  E21B10/52 ,  E21B10/56 ,  E21B10/567 ,  E21B10/08

CPC分类号： E21B10/5673 ,  E21B10/16 ,  E21B10/52

摘要： 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 its 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.

摘要翻译： 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，切割器元件构造成使得其前表面与磨损面相交的内角小于其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。