Electrically controlled latch for well applications

Details Electrically controlled latch for well applications Electrically controlled latch for well applications

1993-03-04

1994-10-11

Novosad, Stephen J.

Wells

Processes

Placing or shifting well part

166 651, 166 664, 166373, E21B 2304, E21B 3120

Patent

active

053538773

ABSTRACT:
A wireline assembly suspended from a cable is lowered down an oil well for temporary latching to a downhole assembly. Latching is provided by keys mounted in the wireline assembly to engage in a complementary recess formed in the downhole assembly and cooperating therewith via surfaces that are perpendicular to the longitudinal axis of the device. Unlocking is obtained by pulling on the cable after an electrically controlled valve has been excited. The valve then communicates two chambers delimited by a control piston inside a cylinder formed in a tubular housing supporting the keys. The tension exerted on the cable is transmitted to the control piston by a rod which actuates an unlocking collar that causes the keys to be retracted.

REFERENCES:
patent: 3661205 (1972-05-01), Berlorgey
patent: 4790380 (1988-12-01), Ireland et al.
patent: 4896721 (1990-01-01), Welch
patent: 5024277 (1991-06-01), Ricles

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