| 摘要 |
A snubbing configuration for inserting a pipe and/or a tool assembly on a pi pe into a live well head employs a telescopic cylinder, e.g. a telescopic snubbing jack, be tween an upper BOP, e.g. an annular BOP, and a lower BOP, e.g. a double-gate BOP, in place of aconventional stripping BOP and an extended spool whi ch are required in conventional configurations to accommodate long tool assemblies.
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