| 摘要 |
An apparatus for installing pipe such as large diameter casing in a wellbore. Sensors are positioned at a predetermined location at or near the upper surface of elevators suspended from a rig traveling block. As elevators are lowered over a section of pipe, such sensors provide a signal indicating that the elevators are positioned a desired distance below the top of the pipe. The signal alerts an operator that elevators are positioned properly relative to a pipe body so that slips within the elevators will be properly engaged against the outer surface of the pipe and not a connection upset or large diameter external coupling.
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