| 摘要 |
A snubbing configuration for inserting a pipe and/or a tool assembly on a pipe i nto a live well head employs a telescopic cylinder, e.g. a telescopic snubbing jack, betwee n an upper BOP, e.g. an annular BOP, and a lower BOP, e.g. a double-gate BOP, in place of a conventional stripping BOP and an extended spool which are required in conventio nal configurations to accommodate long tool assemblies.
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