Drill stem mud wiping apparatus
Patent
·
OSTI ID:5089779
This patent describes a wiping apparatus adapted to be placed in a drill stem including internal upset pipe when pulling the drill stem from a well borehole. It comprises: an elongate mandrel; an elongate sleeve telescoped around the mandrel for wiping movement thereabout; means for inflating the sleeve and causing the sleeve to expand radially outwardly to contact against and wipe the inside wall of the pipe and wherein the inflating means deflates and inflates the sleeve on entry into and departure from internal upsets of the drill stem.
- Assignee:
- NOV; NOV-91-024060; EDB-91-158461
- Patent Number(s):
- US 5012866; A
- Application Number:
- PPN: US 7-517303
- OSTI ID:
- 5089779
- Country of Publication:
- United States
- Language:
- English
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