WO2012089142A1 - 一种复合式单牙轮钻头 - Google Patents

一种复合式单牙轮钻头 Download PDF

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Publication number
WO2012089142A1
WO2012089142A1 PCT/CN2011/084912 CN2011084912W WO2012089142A1 WO 2012089142 A1 WO2012089142 A1 WO 2012089142A1 CN 2011084912 W CN2011084912 W CN 2011084912W WO 2012089142 A1 WO2012089142 A1 WO 2012089142A1
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WIPO (PCT)
Prior art keywords
cone
cutting teeth
journal
bit
tip
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PCT/CN2011/084912
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English (en)
French (fr)
Inventor
陈炼
杨迎新
林敏�
任海涛
Original Assignee
西南石油大学
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Application filed by 西南石油大学 filed Critical 西南石油大学
Publication of WO2012089142A1 publication Critical patent/WO2012089142A1/zh

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/16—Roller bits characterised by tooth form or arrangement
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits

Definitions

  • the invention belongs to the technical field of drilling equipment for oil and gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and particularly relates to a composite single cone bit.
  • a drill bit is a rock breaking tool used in drilling engineering to break rock and form a wellbore.
  • Single-cone bit is one of the main rock-breaking tools used in drilling engineering, especially in small borehole drilling in deep wells.
  • the single-cone bit mainly uses the teeth on the cone to infiltrate the rock and cut the rock.
  • the existing single-cone bit is a non-fixed cutting bit. When the bit rotates, the tooth wheel rotates around the journal. The teeth on the cone break the rock in the form of a mesh scraping at the bottom of the well.
  • the wear resistance of the teeth is one of the main factors affecting the service life of the single-cone bit. Once the teeth are blunt, the drilling speed will drop sharply.
  • the existing single-cone drill bit has insufficient wear resistance, which obviously limits its service life.
  • the teeth on the upper part of the cone are always in contact with the bottom of the well (the position of the teeth changes, but never leaves the bottom of the well), and some areas
  • the tooth gear is replaced with the bottom hole (ie, the tooth is in contact with the bottom rock at part time, and the other time is out of contact), which divides the cone of the single cone bit into a constant contact zone (the tip of the cone) and an alternating contact zone ( as shown in picture 2).
  • the life of the cutting teeth is often lower than that of the alternating contact zone, because the cutting teeth of the constant contact zone are always in working state, and the rotation of the tip of the cone cannot be cut.
  • the teeth on the cone are unevenly worn, and the cutting teeth in the constant contact area (the tip of the cone) are generally faster than the cutting teeth in the alternating contact area, once the cutting of the tip portion of the cone The teeth are severely worn and the rock breaking efficiency of the drill bit is significantly reduced.
  • the axial limit locking device of the cone is often required between the journal and the cone, such as a spherical ball, a split thread ring and a circlip between the journal and the cone (commonly known as a circlip) ), etc., the purpose is to prevent the cone from swaying or even falling off the journal of the bit body.
  • Set the cone axial limit locking device to machine the corresponding limit lock groove (or hole) on the cone and the journal.
  • the limit lock groove (or hole) on the cone and the journal reduces the strength of the journal and the cone body, reduces the contact area between the rotating friction pair between the cone and the journal, and reduces the life of the drill bearing. Summary of the invention
  • a composite single-cone bit includes a bit body, a cone, a cone tip, a cutting tooth disposed on the cone and the cone tip, and a journal on the bit body, the cone and the wheel
  • the journal forms a rotational connection, and the cone tip is fixedly coupled to the front end of the journal.
  • the new single-cone bit has both fixed and rotating cutting structures, that is, the cutting structure is a composite cutting structure.
  • the characteristics of the composite cutting structure determine that the tooth cutting motion trajectory of the drill bit is also a combination of two sets of cutting trajectories. The compounding of the cutting trajectory is more conducive to the cross cutting of the teeth, which is beneficial to improve the rock breaking efficiency of the drill bit.
  • the feature that the tip of the cone is not fixed relative to the bit body is beneficial to the application of high-performance cutting teeth such as PDC composite sheets, so that the wear speed of the cutting teeth of the cone can be significantly slowed down, and the rock eaten is enhanced. ability.
  • the cutting teeth on the tip of the cone are polycrystalline diamond compacts, thermally stable polycrystalline diamond cutting teeth, natural diamond cutting teeth, impregnated diamond cutting teeth, cemented carbide cutting teeth, cubic nitride Boron cutting teeth, ceramic cutting teeth, or cutting teeth containing diamond or cubic boron nitride.
  • the cutting teeth on the cone are polycrystalline diamond composite sheets, thermally stable polycrystalline diamond cutting teeth, natural diamond cutting teeth, impregnated diamond cutting teeth, cemented carbide cutting teeth, cubic boron nitride Cutting teeth, ceramic cutting teeth, or cutting teeth containing diamond or cubic boron nitride.
  • the combination of the cone and the cone tip is a spherical contour structure.
  • the entire lower hemisphere contacts the bottom of the well and covers the entire bottom of the well during the drilling process, which is beneficial to the stable operation of the drill bit.
  • a nozzle is provided on the tip of the cone.
  • the nozzle on the tip of the cone enhances the cleaning of the tip of the cone by the drilling fluid, so that the cuttings at the tip of the cone can be removed in time and the cooling of the cutting teeth is improved.
  • the cone axial limit locking device may not be disposed between the journal and the cone.
  • the cone tip is fixedly connected to the journal end of the bit body, which can directly lock the cone on the journal to prevent the cone from swaying and falling off.
  • a ball is disposed between the journal and the cone.
  • the setting of the ball can strengthen the axial locking of the cone and increase the anti-falling reliability of the cone.
  • the invention has the following beneficial effects:
  • the fixed cutting teeth on the tip of the cone of the present invention form a concentric circular cutting trajectory at the bottom of the well, that is, the teeth only have circumferential motion and no radial motion when cutting the rock.
  • the non-fixed cutting teeth on the cone wheel cut the bottom rock with both radial and circumferential motion, forming a complex cutting path.
  • the crossover effect of two different rock breaking trajectories is very beneficial for improving the rock breaking efficiency of fixed and non-fixed cutting teeth.
  • the tip of the cone of the present invention is fixedly connected to the bit body.
  • the cutting teeth of the tip portion of the cone are fixed cutting teeth, and the feature that the tip of the cone is fixed relative to the bit body is favorable for PDC.
  • the application of high-performance cutting teeth such as composite sheets can significantly slow down the wear speed of the cutting teeth of the cone and enhance its ability to eat rock.
  • the tooth tip of the present invention is directly fixedly attached to the journal end of the bit body, which reduces the interaction area between the cone and the bottom of the well, and reduces the load on the cone, that is, reduces the load on the cone bearing. Therefore, the present invention can effectively extend the life of the drill bearing.
  • the roller nose of the present invention is fixedly connected to the journal end of the bit body, and can directly lock the cone on the journal, and the cone locking device disposed between the journal and the cone can be omitted. It can obviously improve the strength of the journal and the cone body, increase the contact area of the rotating friction pair between the cone and the journal, and is beneficial to prolong the life of the drill bearing.
  • Figure 1 is a schematic view of the structure of the present invention.
  • bit body 2, cone, 3, cone tip, 5, cutting teeth
  • Figure 2 is a schematic view of the contact area between the cone and the bottom of the well.
  • la constant contact area
  • lb alternating contact area
  • Figure 3 is a schematic view showing the structure of the cone after the axial direction locking device is not disposed between the journal and the cone of the present invention.
  • the journal In the figure: 4, the journal;
  • Figure 4 is a schematic view showing the structure of the roller after the roller is axially locked between the journal and the cone.
  • 4a balls;
  • FIG. 5 is a schematic view showing the structure of a polycrystalline diamond compact (PDC) tooth.
  • PDC polycrystalline diamond compact
  • Figure 6 is a left side view of Figure 1;
  • Figure 7 is a schematic structural view of the general direction of the present invention.
  • Fig. 8 is a schematic view showing the structure of the nozzle of the present invention when a nozzle is provided.
  • nozzle Figure 9 is a schematic diagram of the complex staggered mesh scratches of the drill bit cut at the bottom of the well under the action of the fixed cutting teeth on the cone tip of the present invention and the non-fixed cutting teeth on the cone.
  • Fixed on the tip of the cone Concentric circular scratches cut by the cutting teeth. 9. Scratches with complex shapes cut by non-fixed cutting teeth on the cone. detailed description
  • a composite single-cone bit includes a bit body 1, a cone 2, a cone tip 3, and the cone 2 and the cone tip 3 are disposed a cutting tooth 5, the bit body 1 is provided with a journal 4, and the cone 2 forms a rotational connection with the journal 4, characterized in that: the cone tip 3 is fixed to the front end of the journal 4 connection.
  • the cutting teeth on the tip of the cone are polycrystalline diamond composite sheets, thermally stable polycrystalline diamond cutting teeth, natural diamond cutting teeth, impregnated diamond cutting teeth, cemented carbide cutting teeth, cubic boron nitride cutting teeth, Ceramic cutting teeth, or cutting teeth containing diamond or cubic boron nitride.
  • the cutting teeth on the cone are polycrystalline diamond composite sheets, thermally stable polycrystalline diamond cutting teeth, natural diamond cutting teeth, impregnated diamond cutting teeth, cemented carbide cutting teeth, cubic boron nitride cutting teeth, ceramics Cutting teeth, or cutting teeth containing diamond or cubic boron nitride.
  • the combination of the cone 2 and the cone tip 3 is a spherical contoured structure.
  • the entire lower hemisphere contacts the bottom of the well and covers the entire bottom of the well, which is beneficial to the stable operation of the drill bit.
  • the nozzle tip 3 is provided with a nozzle 10.
  • the nozzle on the tip of the cone enhances the cleaning of the tip of the cone by the drilling fluid, and enhances the movement of the tip of the cone and the cooling of the cutting teeth.
  • a cone axial limit locking device is not disposed between the journal and the cone. As shown in Fig. 3, the cone tip is fixedly connected to the journal end of the bit body, which can directly lock the cone on the journal to prevent the cone from swaying and falling off.
  • a ball 4a is disposed between the journal 4 and the cone 1 , and the arrangement of the balls can strengthen the axial limit locking of the cone and increase the anti-falling reliability of the cone.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Description

一种复合式单牙轮钻头
技术领域
本发明属于石油天然气、 矿山工程、 建筑基础工程施工、 地质、 水文等钻 探设备技术领域， 具体的讲涉及一种复合式单牙轮钻头。
背景技术
钻头是钻井工程中用以破碎岩石、 形成井筒的破岩工具。 单牙轮钻头是钻 井工程中使用的主要破岩工具之一， 特别是在深井超深井的小井眼钻井中发挥 着重要的作用。
单牙轮钻头主要利用牙轮上的牙齿对岩石的压入、 切削作用破岩。 现有单 牙轮钻头均属非固定切削齿钻头， 钻头旋转时牙轮绕轴颈转动， 牙轮上的牙齿 在井底以网状刮切形式破岩。 牙齿的耐磨性是影响单牙轮钻头使用寿命的主要 因素之一， 齿一旦磨钝， 钻速就会急剧降低。 现有单牙轮钻头牙齿耐磨性不足， 明显制约了其使用寿命。
在单牙轮钻头的工作过程中， 牙轮上部分区域（牙轮尖部分） 的牙齿始终 与井底接触 （牙齿的位置虽然会发生变化， 但始终不脱离井底）， 另有部分区域 的牙齿轮换与井底接触 （即牙齿在部分时间与井底岩石接触， 其它时间脱离接 触），这就把单牙轮钻头的牙轮分成了恒接触区（牙轮尖部分）和交替接触区 （如 图 2所示）。 对于恒接触区 （牙轮尖部分） 的切削齿来讲， 其寿命往往低于交替 接触区的切削齿， 因为恒接触区的切削齿始终处于工作状态， 牙轮尖部分的转 动不能给其切削齿带来轮换的效果。 同时由于单牙轮钻头主要以网状刮切形式 且变化范围很大， 这样， 牙齿在切削岩石过程中的受力方向也将在很大的范围 内变化， 甚至可以在一次接触井底岩石的过程中先后经历方向相反作用力的情 况。 这就使耐磨性强、 切削性能好的聚晶金刚石复合片 （PDC齿）在单牙轮钻头 上的应用受到了很大的限制。 原因在于： 聚晶金刚石复合片 （PDC齿）是由钨钴 硬质合金基体和聚晶金刚石层两部分组成（如图 5所示）， 如果 PDC齿在工作过 程中受力方向变化幅度过大， 或者受到反向作用力， 很容易造成聚晶金刚石层 的崩裂， 严重降低 PDC齿的工作寿命。 因此， 现有单牙轮钻头上的切削齿一般 为硬质合金齿。
单牙轮钻头在井底工作时， 牙轮上的牙齿磨损不均匀， 其恒接触区 （牙轮 尖部分） 的切削齿磨损一般快于交替接触区的切削齿， 一旦牙轮尖部分的切削 齿发生严重磨损， 钻头的破岩效率就会显著下降。
现有单牙轮钻头在轴颈与牙轮之间往往需设置牙轮轴向限位锁定装置， 如 在轴颈与牙轮之间设置球形滚珠、 对开螺纹环、 弹性挡圈 （俗称卡簧）等， 目 的是为了避免牙轮从钻头体的轴颈上窜动甚至脱落。 设置牙轮轴向限位锁定装 置需在牙轮与轴颈上加工出相应的限位锁定槽（或孔）。 牙轮与轴颈上的限位锁 定槽（或孔）将降低轴颈与牙轮体的强度， 减少牙轮与轴颈之间转动摩擦副的 接触面积， 降低钻头轴承的寿命。 发明内容
本发明的目的是提供一种由固定切削结构和非固定切削结构复合而成的单 牙轮钻头， 提高钻头的破岩效率及钻头的寿命。
本发明的技术方案如下：
一种复合式单牙轮钻头， 包括钻头体、 牙轮、 牙轮尖， 所述牙轮与牙轮尖 上布置有切削齿， 所述钻头体上设置有轴颈， 所述牙轮与所述轴颈形成转动连 接， 所述牙轮尖与所述轴颈的前端固定连接。
上述技术方案将传统单牙轮钻头整体式结构的牙轮体， 分解为固定不转的 牙轮尖部分及可转动的牙轮部分。 这样， 新型单牙轮钻头就具备了固定与转动 两种切削结构， 即其切削结构为复合切削结构。 复合切削结构的特征决定了钻 头的牙齿切削运动轨迹也是两套切削轨迹的复合。 切削轨迹的复合更有利于实 现牙齿的交叉切削， 有利于提高钻头的破岩效率。 另一方面， 牙轮尖部相对钻 头体固定不转的特征有利于 PDC复合片等高性能切削齿的应用， 因而可以显著 减緩牙轮尖部切削齿的磨损速度， 增强其吃入岩石的能力。
作为优选方式， 所述牙轮尖上的所述切削齿为聚晶金刚石复合片、 热稳定 聚晶金刚石切削齿、 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿, 立方氮化硼切削齿、 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。
作为优选方式， 所述牙轮上的所述切削齿为聚晶金刚石复合片、 热稳定聚 晶金刚石切削齿、 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿、 立方氮化硼切削齿、 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。
作为一般的实施方式， 所述牙轮与牙轮尖的组合为球形轮廓结构。 当牙轮 与牙轮尖的组合为球形轮廓结构时， 钻头钻进工作过程中， 整个下半球均与井 底接触并覆盖占据整个井底， 有利于钻头的稳定工作。
作为优选方式， 所述牙轮尖上设置有喷嘴。 牙轮尖上设置喷嘴能增强钻井 液对牙轮尖部的清洗， 使牙轮尖部的岩屑能够被及时地带走， 同时改善切削齿 的冷却。
作为一般的实施方式， 所述轴颈与牙轮之间可不设置牙轮轴向限位锁定装 置。 牙轮尖固定连接在钻头体轴颈端上， 能直接对轴颈上的牙轮起到锁定作用， 防止牙轮的窜动及脱落。
所述轴颈与牙轮之间设置有滚珠。 滚珠的设置可加强对牙轮轴向限位锁定 的作用， 增加牙轮的防脱落可靠性。 本发明与现有技术相比， 其有益效果是：
( 1 )本发明牙轮尖上的固定切削齿在井底形成同心圆切削轨迹， 即牙齿切 削岩石时只有周向运动， 无径向运动。 而牙轮上的非固定切削齿切削井底岩石 时既有径向运动， 又有周向运动， 形成一种形状复杂的切削轨迹。 两种不同破 岩轨迹的交叉作用， 对提高固定切削齿和非固定切削齿的破岩效率都是十分有 益的。
( 2 )本发明的牙轮尖部分固定连接在钻头体上， 钻头旋转钻进时， 牙轮尖 部分的切削齿为固定切削齿， 牙轮尖部相对钻头体固定不转的特征有利于 PDC 复合片等高性能切削齿的应用， 因而可以显著减緩牙轮尖部切削齿的磨损速度， 增强其吃入岩石能力。
( 3 )本发明牙轮尖部分采用 PDC齿时， 较普通单牙轮钻头的硬质合金齿等 更易于吃入地层， 有利于提高钻头破岩效率。
( 4 )本发明的牙轮尖直接固定连接在钻头体轴颈端上， 减少了牙轮与井底 的互作用区域， 减少了牙轮上的载荷， 即减少了牙轮轴承的载荷。 因此， 本发 明能有效延长钻头轴承寿命。
( 5 )本发明的牙轮尖固定连接在钻头体轴颈端上， 能直接对轴颈上的牙轮 起到锁定作用， 可省去轴颈与牙轮之间设置的牙轮锁定装置， 能明显提高轴颈 与牙轮体的强度， 增加牙轮与轴颈之间转动摩擦副的接触面积， 有利于延长钻 头轴承寿命。 附图说明
本发明将通过例子并参照附图的方式说明， 其中：
图 1为本发明的结构示意图。 图中： 1、 钻头体， 2、 牙轮， 3、 牙轮尖， 5, 切削齿； 图 2为牙轮与井底接触区域的示意图。 图中： la、 恒接触区， lb、 交替接 触区；
图 3为本发明的轴颈与牙轮之间未设置轴向限位锁定装置时牙轮剖开后的 结构示意图。 图中： 4、 轴颈；
图 4为本发明的轴颈与牙轮之间设置有滚珠轴向限位锁定装置时牙轮剖开 后的结构示意图。 图中： 4a、 滚珠；
图 5为聚晶金刚石复合片 （PDC )齿的结构示意图。 图中： 6、 聚晶金刚石 层， 7、 基体；
图 6为图 1的左视图；
图 7为本发明一般方向的结构示意图；
图 8为本发明的牙轮尖部设置喷嘴时的结构示意图。 图中： 10、 喷嘴； 图 9为在本发明牙轮尖上的固定切削齿和牙轮上的非固定切削齿共同作用 下， 钻头在井底刮切出的复杂交错网状刮痕示意图。 图中： 8、 牙轮尖上的固定 切削齿刮切出的同心圆状刮痕， 9、 牙轮上的非固定切削齿刮切出的形状复杂的 刮痕。 具体实施方式
如图 1、 3、 4、 6、 7所示： 一种复合式单牙轮钻头， 包括钻头体 1、 牙轮 2, 牙轮尖 3 , 所述牙轮 2与牙轮尖 3上布置有切削齿 5 , 所述钻头体 1上设置有轴 颈 4 , 所述牙轮 2与所述轴颈 4形成转动连接， 其特征在于： 所述牙轮尖 3与所 述轴颈 4的前端固定连接。
所述牙轮尖上的所述切削齿为聚晶金刚石复合片、 热稳定聚晶金刚石切削 齿、 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿、 立方氮化硼切 削齿、 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。 所述牙轮上的所述切削齿为聚晶金刚石复合片、 热稳定聚晶金刚石切削齿， 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿、 立方氮化硼切削齿， 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。
钻头钻进时， 在钻头体 1的旋转带动下， 牙轮 2围绕钻头中心轴线作公转 的同时， 还绕轴颈 4作自转运动， 如图 2所示， 牙轮 2交替接触区 lb上的非固 定切削齿在这种复合运动下在井底形成一种形状复杂的切削刮痕 9，如图 9所示； 由于牙轮尖 3固定连接在钻头体的轴颈 4端上， 与钻头体 1相对固定， 钻头旋 转钻进时牙轮尖 1恒接触区 la上的固定切削齿将围绕钻头中心在井底形成同心 圆形刮痕 8。 上述两种刮切轨迹的复合， 在井底全域实现了有效的交叉切削， 形 成了网络状的井底形貌。
所述牙轮 2与牙轮尖 3的组合为球形轮廓结构。 球形轮廓结构时， 钻头钻 进工作过程中， 整个下半球均与井底接触并覆盖占据整个井底， 有利于钻头的 稳定工作。
如图 8所示， 所述牙轮尖 3上设置有喷嘴 10。 牙轮尖上设置喷嘴能增强钻 井液对牙轮尖部的清洗， 增强牙轮尖部岩屑的运移和切削齿的冷却。
所述轴颈与牙轮之间未设置牙轮轴向限位锁定装置。 如图 3所示， 牙轮尖 固定连接在钻头体轴颈端上， 能直接对轴颈上的牙轮起到锁定作用， 防止牙轮 的窜动及脱落。
如图 4所示， 所述轴颈 4与牙轮 1之间设置有滚珠 4a , 滚珠的设置可加强 牙轮的轴向限位锁定的作用， 增加牙轮的防脱落可靠性。

Claims

WO 2012/089142 权 利 要 求 书 PCT/CN2011/084912
1、 一种复合式单牙轮钻头， 包括钻头体（1)、 牙轮（ 2)、 牙轮尖 （ 3), 所 述牙轮（ 2 )与牙轮尖（ 3 )上布置有切削齿（ 5 ), 所述钻头体 （ 1 )上设置有轴 颈 （4), 所述牙轮（ 2 )与所述轴颈 （4 )形成转动连接， 其特征在于： 所述牙 轮尖（ 3 )与所述轴颈 （ 4 ) 的前端固定连接。
2、 根据权利要求 1所述的一种复合式单牙轮钻头， 其特征在于： 所述牙轮 尖（3)上的所述切削齿（5 )为聚晶金刚石复合片、 热稳定聚晶金刚石切削齿， 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿、 立方氮化硼切削齿， 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。
3、 根据权利要求 1所述的一种复合式单牙轮钻头， 其特征在于： 所述牙轮 ( 2 )上的所述切削齿 （5 ) 为聚晶金刚石复合片、 热稳定聚晶金刚石切削齿、 天然金刚石切削齿、 孕镶金刚石切削齿、 硬质合金切削齿、 立方氮化硼切削齿， 陶瓷切削齿、 或者， 包含金刚石或立方氮化硼的切削齿。
4、 根据权利要求 1、 2或 3所述的一种复合式单牙轮钻头， 其特征在于： 所述牙轮（ 2 )与牙轮尖（ 3 ) 的组合为球形轮廓结构。
5、 根据权利要求 1、 2或 3所述的一种复合式单牙轮钻头， 其特征在于： 所述牙轮尖（ 3 )上设置有喷嘴（10)。
6、 根据权利要求 1、 2或 3所述的一种复合式单牙轮钻头， 其特征在于： 所述轴颈 （ 4 )与牙轮（ 1 )之间未设置牙轮轴向限位锁定装置。
7、 根据权利要求 1、 2或 3所述的一种复合式单牙轮钻头， 其特征在于： 所述轴颈 （ 4 )与牙轮（ 1 )之间设置有滚珠 ( 4a)0
PCT/CN2011/084912 2010-12-30 2011-12-29 一种复合式单牙轮钻头 WO2012089142A1 (zh)

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