Device in core barrels

Details Device in core barrels Device in core barrels

1981-10-05

1984-06-05

Novosad, Stephen J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Signaling or indicating condition of cutting in cuttings...

175236, 175247, 175243, E21B 2500

Patent

active

044523211

ABSTRACT:
A device in core drilling for indicating when a core barrel placed in a rotatable hollow drill rod is no longer capable of receiving a further quantity of reamed-out core material includes a valve which at said condition of the barrel constricts the passage for flushing medium flowing between the core barrel and the bore of the drill rod so that a readable flushing medium pressure increase occurs. The valve closes off said passage incompletely to allow a minor quantity of flushing medium to be taken to the drill bit mounted at the bottom of the drill rod, thereby to prevent said drill bit from being burnt out.

REFERENCES:
patent: 2857138 (1958-10-01), Svendsen et al.
patent: 3225845 (1965-12-01), Koontz et al.
patent: 3305033 (1967-02-01), Pickard et al.
patent: 3346059 (1967-10-01), Svendsen
patent: 3777826 (1973-12-01), Wolda

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