Down hole electrically operated safety valve

Details Down hole electrically operated safety valve Down hole electrically operated safety valve

1990-10-05

1991-12-10

Kisliuk, Bruce M.

Wells

With electrical means

Electrical motor

166332, 2511292, 25112921, E21B 3406, F16K 3102

Patent

active

050709445

ABSTRACT:
A mechanical actuator operated by electrical power suitable for actuating down hole equipment in a well, e.g. down hole safety valves, has an electric motor, a gear assembly with a mechanical advantage of at least 30:1, a two-part drive sleeve, the parts being connected by, e.g. splines so that the two parts can rotate together while capable of relative axial movement, an actuating sleeve moved axially by rotation of the drive sleeve, and a releasable lock operated by a solenoid to lock the two parts of the drive sleeve against relative axial movement. Rotation of the motor in one direction primes the actuator, rotating in the other direction actuates the equipment and the solenoid-operated releasable lock holds the equipment in the actuating position. If the solenoid is switched off, deliberately or by power failure, the lock is released allowing the equipment to return to its fail-safe position.

REFERENCES:
patent: 3665955 (1972-05-01), Conner, Sr.
patent: 4373582 (1983-02-01), Bednar et al.
patent: 4566534 (1986-01-01), Going, III
patent: 4948091 (1990-08-01), Satoh et al.
"The Flexible Transmission", Harmonic Drive Limited brochure.

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