Core barrel
Patent
·
OSTI ID:6491225
A core barrel assembly is described for suspending the core lifter case of a wire-line core-barrel, inner tube assembly out of contact with the drill bit while a core is being drilled and at the same time maximizing the diameter core that can be drilled. The core-barrel, inner tube assembly has a reduced diameter portion that works in conjunction with an expandable mechanism mounted in a hanger coupling of a drill stem, and a core-lifter case for expanding the mechanism as the inner end of the core- barrel, inner tube assembly passes through. The drill stem couplings, other than for the latch seat and the threaded portions of the couplings, are of a constant inside diameter (i.e., no suspension flange). Accordingly, a larger diameter core can be taken for the same diameter hole. (12 claims)
- Assignee:
- TUL; EDB-81-078521
- Patent Number(s):
- US 3305033
- OSTI ID:
- 6491225
- Country of Publication:
- United States
- Language:
- English
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