Keyless latch for orienting and anchoring downhole tools

Details Keyless latch for orienting and anchoring downhole tools Keyless latch for orienting and anchoring downhole tools

1995-06-29

1996-12-03

Dang, Hoang C.

Wells

Means for guiding insertable element laterally of well axis

Secured in operative position by movable means engaging well...

166214, 166237, 1662553, E21B 708

Patent

active

055798292

ABSTRACT:
A keyless latch assembly automatically aligns and fixes the axial and circumferential position of a whipstock within a surrounding casing joint. Alignment and fixing of the whipstock ensures proper engagement and orientation of a drill bit relative to an access window formed in the casing wall. Spring loaded latches in the assembly register with and extend into corresponding receiving recesses formed on the inner surface of the casing joint. The recesses, which are spaced circumferentially around the interior of the casing joint, contain differing profiles that uniquely mate with corresponding profiles on the latches. The position of the latches relative to the recesses determines the amount of radial latch movement which controls the anchoring and orientation of the assembly within the casing. Confirmation of correct axial location and proper circumferential orientation may be made by surface monitoring of the setting string weight and turning torque. The spring loaded latches release from anchored, oriented position in response to an upward axial force exerted by the drill string to provide a straight pull release of the assembly.

REFERENCES:
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patent: 2862564 (1958-12-01), Bostock
patent: 3070166 (1962-12-01), Knauth
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patent: 4303299 (1981-12-01), Holland et al.
patent: 4369840 (1983-01-01), Szarka et al.
patent: 4415205 (1983-11-01), Rehm et al.
patent: 4896721 (1990-01-01), Welch
patent: 5390742 (1995-02-01), Dines et al.

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