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    • 7. 发明授权
    • Method and apparatus for removing the inner conduit from a dual passage
drill string
    • 从双通道钻柱去除内管道的方法和装置
    • US4691790A
    • 1987-09-08
    • US708245
    • 1985-03-05
    • James M. ReichmanMichael C. McDonaldT. B. O'Brien
    • James M. ReichmanMichael C. McDonaldT. B. O'Brien
    • E21B3/00E21B7/18E21B10/42E21B10/43E21B10/60E21B21/12E21B17/18F16L17/00
    • E21B10/43E21B10/60E21B21/12E21B7/18
    • A dual conduit drill string used in drilling holes for geothermal, oil and gas wells, and the like, comprises a removable inner conduit to permit the use of salvage or repair equipment within the outer conduit. The outer conduit comprises standard API drill pipe sections which are each slightly modified to receive the removable inner conduit sections. Each inner conduit section is provided with flexible hangers for suspending the weight of the inner conduit from a support ledge formed on the interior surface of the drill pipe. The hangers permit upward removal motion and rotation of the inner conduit with respect to the drill pipe, but prevent downward motion. Individual inner conduit sections are joined together at lockable stab joints in which locking is accomplished by the rotatable engagement of a key and locking socket. Preferably, the inner conduit is manufactured in uniform lengths and mounted in drill pipe sections of non-uniform lengths by means of drill pipe adaptor subs. In addition, a removal tool can be used to remove the inner conduit from the drill pipe by engaging the hangers of the lowest inner conduit.
    • 用于地热,油井和气井等的钻孔中的双导管钻柱包括可移除的内导管,以允许在外导管内使用救助或修理设备。 外部导管包括标准的API钻杆部分,它们都被略微修改以容纳可拆卸的内部管道部分。 每个内部管道部分设置有用于将内部管道的重量从形成在钻杆的内表面上的支撑突起悬挂的柔性悬挂器。 吊架允许内导管相对于钻杆的向上移动和旋转,但是防止向下运动。 单个内部导管段在可锁定的刺刺接头处连接在一起,其中通过钥匙和锁定插座的可旋转接合来实现锁定。 优选地,内导管以均匀的长度制造并且通过钻杆适配器接头安装在不均匀长度的钻杆部分中。 此外,可以使用去除工具来通过接合最低内部导管的悬挂器从钻杆去除内部导管。