Dual ball valve sampler safety valve

Details Dual ball valve sampler safety valve Dual ball valve sampler safety valve

E - Fixed Constructions

21

B

166/42

E21B 23/06 (2006.01)

Patent

CA 1187784

ABSTRACT OF DISCLOSURE In accordance with an illustrative embodiment of the present invention, a full-bore sampler and safety valve ap- paratus includes a housing having an actuator mandrel slidably arranged therein, axially spaced normally open ball valve elements mounted on the mandrel assembly and cooperable with fixed eccentric pins on the housing for simultaneously closing a flow passage extending through the housing when the mandrel assembly is shifted from one axial position to another, a hydraulically operable piston on the mandrel assembly normally subject to balanced pressures, and means responsive to a predetermined pressure of fluids in the well annulus for exposing the hydraulically operable means to well pressure to cause shifting of the actuator mandrel assembly and simultaneous closing of the ball valve elements.

408828

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