Dry hole wire core barrel apparatus

Details Dry hole wire core barrel apparatus Dry hole wire core barrel apparatus

1974-04-11

1976-01-06

Ward, Jr., Robert S.

Handling: hand and hoist-line implements

Grapple

Well type

294 863, 294 8632, 294 8633, E21B 2500, E21B 3100

Patent

active

039306798

ABSTRACT:
Wire line core barrel apparatus that includes a wire line core barrel inner tube assembly movable through a drill stem to be seated in a latched core taking position adjacent the drill stem core bit, and a main overshot assembly that is coupled to a lowering overshot assembly for lowering the inner tube assembly and alternately coupled to a retracting overshot assembly for withdrawing the inner tube assembly. The inner tube assembly includes a generally annular overshot coupling member secured to a latch release tube that is mounted on a latch body to retract a pair of latches when said tube is moved axially outwardly relative the latch body, and an overshot coupling rod secured to the latch body and extended through the coupling member. The lowering overshot assembly has a lock coupling for releasably couplingly engaging the coupling rod that upon pulling on the lowering assembly with more than a given force will release coupling engagement of the lowering with the coupling rod. The retracting overshot assembly has a collet that will couplingly engage the coupling member upon lowering the retracting overshot assembly, and that upon withdrawing the retracting overshot assembly moves the latch release tube to first move the latches to a retracted position and then retract the inner tube assembly.

REFERENCES:
patent: 3127943 (1964-04-01), Mori
patent: 3225845 (1965-12-01), Koontz et al.
patent: 3266835 (1966-08-01), Hall et al.
patent: 3333647 (1967-08-01), Karich et al.
patent: 3441098 (1969-04-01), Martinsen
patent: 3461981 (1969-08-01), Casper et al.
patent: 3666300 (1972-05-01), Russell

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