Core drilling latch assembly

Details Core drilling latch assembly Core drilling latch assembly

1998-08-31

1999-11-30

Schoeppel, Roger

Boring or penetrating the earth

Processes

Sampling of earth formations

175247, E21B 2500

Patent

active

059925434

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:
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patent: 3777826 (1973-12-01), Wolda
patent: 3986555 (1976-10-01), Robertson
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patent: 5267620 (1993-12-01), Lee
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patent: 5339915 (1994-08-01), Laporte et al.
patent: 5799742 (1998-09-01), Soinski et al.
Westcoast Drilling Products Ltd. Product Information Brochure Re Posi-Latch System, 2 pages, date unknown, (admitted prior art).
Longyear Product Brochure, 2 pages, dated Jan. 1, 1982.

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