Core drilling latch assembly

Details Core drilling latch assembly Core drilling latch assembly

1996-10-22

1998-09-01

Bagnell, David J.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

In sample receiver removable through below-ground tool shaft

175246, E21B 2502

Patent

active

057997420

ABSTRACT:
A core drilling latch assembly for use in terrestrial core drilling operations. The latch assembly incorporates features and elements which affect the flow of drilling fluids past the latch assembly and toward the drill bit, depending upon whether the latch assembly has contacted the landing ring in the drill string and whether the latch assembly has locked in place within the string. Accordingly, the latch assembly signals the drilling crew by pressure fluctuations when the latch assembly is in proper position within the drill string, and whether it is locked in position.

REFERENCES:
patent: 3225845 (1965-12-01), Koontz et al.
patent: 3777826 (1973-12-01), Wolda
patent: 4800969 (1989-01-01), Thompson
patent: 5020612 (1991-06-01), Williams
Westcoast Drilling Products Ltd. Products Information Brochure Re Posi-Latch System, 2 pages, date unknown.
Longyear's Product Brochure, 2 pages, dated Jan. 1, 1982.

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