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    • 6. 发明公开
    • Rotary drill bit having movable formation-engaging members
    • Drebohrmeissel mit beweglichen Formation-eingreifenden Elementen
    • EP0874128A2
    • 1998-10-28
    • EP98303080.0
    • 1998-04-22
    • Camco International (UK) Limited
    • Griffin, Nigel DennisFuller, John MichaelNewton, AlexTaylor, Malcolm RoyMurdock, AndrewTaylor, Steven
    • E21B10/62E21B10/56
    • E21B10/567E21B7/068E21B10/322E21B10/325E21B10/327E21B10/54E21B10/62E21B44/005
    • In a rotary drag-type drill bit for drilling subsurface formations, at least one formation-engaging member is movably mounted on the bit body so as to be movable in and out, relative to fixed cutting elements, in response to engagement with the formation being drilled. In one arrangement the formation-engaging member (48) is generally pear-shaped and is bonded within a body of rubber (49) within a tubular sleeve (50) screwed into a threaded socket in the bit body (51). The body of rubber (49), confined within the sleeve (50), offers comparatively solid resistance to impact at right angles to the surface of the bit body. However, when subjected to a force having a sideways component the member (48) tilts against the resilience of the rubber (49), to reduce the extent to which the member projects above the surface of the bit body. The member (48) thus protects an associated cutting element against impact but yields to allow the cutting element to engage the surface of the formation being drilled.
    • 在用于钻井地下构造的旋转式拖曳式钻头中,至少一个地层接合构件可移动地安装在钻头体上,以便相对于固定的切割元件能够相对于与地层啮合而相互移动和移出 钻出。 在一种布置中,地层接合构件(48)通常是梨形的,并且在螺纹连接到钻头体(51)中的螺纹插座中的管状套筒(50)内的橡胶体(49)内结合。 限制在套筒(50)内的橡胶体(49)提供了与钻头体表面成直角冲击的相当坚固的抵抗力。 然而,当受到具有侧向部件的力时,构件(48)抵抗橡胶(49)的弹力倾斜,以减小构件在钻头体的表面上方突出的程度。 构件(48)因此保护相关联的切割元件免受冲击,但是产生以允许切割元件接合正被钻孔的地层的表面。
    • 8. 发明公开
    • Bohrkrone zum Überlagerungsbohren
    • Bohrkrone zumÜberlagerungsbohren。
    • EP0563561A1
    • 1993-10-06
    • EP93102651.2
    • 1993-02-19
    • Boart HWF GmbH & Co. KG Hartmetallwerkzeugfabrik
    • Rosenkranz, Peter, Dipl.-Ing.
    • E21B10/32
    • E21B10/327E21B7/20E21B10/38E21B10/56E21B10/62
    • Eine Bohrkrone zum Überlagerungsbohren mit einem mit Hartmetallstiften (3) oder dergleichen versehenen Kopf (1) und einem den Kopf (1) tragenden Schaft (2) , wobei der Schaft (2) Mittel (4) zur drehstarren Verbindung mit einem angetriebenen Innenrohrgestänge aufweist und wobei die Bohrkrone mindestens eine Spülmittelleitung (5) aufweist, kann insbesondere bezüglich ihrer Wartung, dahingehend verbessert werden, ohne auf die Richtungsgenauigkeit und die Schnittleistung zu verzichten, indem der Kopf (1) eine Mehrzahl von symmetrisch über seinen Umfang verteilt angeordneten Ausnehmungen (6) aufweist und indem in den Ausnehmungen (6) Schwenkkronen (7) derart angeordnet sind, daß sie im eingeschwenkten Zustand innerhalb des Bohrkronendurchmessers zu liegen kommen und im ausgeschwenkten Zustand um ein vorgegebenes Maß über den Bohrkronendurchmesser hinauskragen.
    • 一种重叠的钻头,具有设置有硬质合金销(3)等的头部(1)和承载头部(1)的柄部(2),所述柄部(2)具有用于旋转刚性地连接到 驱动内杆杆和具有至少一个钻井液管线(5)的钻头,尤其是关于其维护而不用头部(1)的方向精度和切割效率而不改变, 具有多个在其周边上对称地分布的凹槽(6),并且旋转凸轮(7)布置在凹槽(6)中,使得它们位于摆动状态的钻头的直径内 并且在摆动状态下突出超过钻头的直径到预定的程度。
    • 9. 发明公开
    • Drilling tool
    • 钻井工具
    • EP0391873A3
    • 1991-04-03
    • EP90850127.3
    • 1990-04-03
    • UNIROC AKTIEBOLAG
    • Löf, Stig Uno
    • E21B7/20
    • E21B10/327E21B7/20E21B10/32E21B10/40E21B10/66
    • A drilling tool is followed by a casing tube (11) down the drilled hole. The mouth of the casing tube (11) centers rotatably a guide member (10) which receives rotation and impact energy via the interior of the casing tube (11). A drill bit (20) consists integrally of an axially protruding pilot portion (23), a sidewise projecting eccentric portion (22) and a rear shaft (21). The shaft (21) extends pivotally and axially movably into an eccentrically disposed bore (24) in the guide member (10). Axially spaced peripheral end grooves (30,32) extend in opposite direction from an axial cam groove (31) on the shaft (21) and are engaged by a follo­wer (28) in the guide member (10) defining positively the axial and angular movability and positions thereof relative to the drill bit (20). In the forward end groove (32) the follower (28) maintains the drill bit (20) axially in dril­ling position adjacent to the guide member (10) with the eccentric portion (22) protruding to drill a hole larger than the casing tube (11). In an intermediate position 90° away from the drilling position, the follower (28) enters the cam groove (31) whereby the guide member (10) becomes axially movable the distance between the end grooves (30,32). In a rear axial position the guide member (10) by a continued 90° turn brings the follower (28) into the rear end groove (30) to axially define the retracted position of the drill bit (20), wherein it can be raised or lowered freely through the casing tube (11).