| 摘要 |
An injector is provided for injecting and withdrawing large diameter coiled tubing comprising a linear section of gripping blocks driven on an endless chain conveyor. The coiled tubing is forced into frictional engagement with the blocks by a corresponding linear array of rollers. The arrangement is gentle on the coiled tubing. The injector is not restricted in length and thus provides a linear driving section of configurable length for providing superior injection and pulling capacities. In combination with the strong draw works, the mast and rotary table of a conventional rig enables making up both sectional tubing for assembling BHA's, drilling surface hole and making up to non-rotating coiled tubing from the injector. Using a mast having two open sides and with dual draw works, increased functionality is provided and less serial handling.
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