Wells – Valves – closures or changeable restrictors – Destructible element
Patent
1983-02-14
1984-10-02
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Destructible element
166318, 166323, 166325, 166332, 137 71, 13761414, E21B 3410
Patent
active
044742410
ABSTRACT:
A differential fill valve assembly for application in float collars or shoes in well casing. The valve assembly comprises a back pressure flapper valve disposed within a substantially tubular upper housing, and a lower housing containing an activating sleeve slidably disposed therein above a double flapper valve assembly. The activating sleeve initially extends into the upper housing to a sufficient extent to maintain the flapper valve in an open position; the activating sleeve is maintained in this position through use of shear pins, by which it is secured to the lower housing. The double flapper valve comprises a first flapper responsive to pressure below the valve assembly, and a second flapper responsive to force applied from above. A tripping ball is dropped to seat in the activating sleeve when it is desired to release the back pressure flapper valve; pressure applied on the ball moves the activating sleeve downward, releasing the back pressure flapper valve and swinging the double flapper valve assembly out of the flow path through the differential fill assembly, after which the tripping ball exits the bottom of the assembly. A lock ring maintains the activating sleeve in its lower position, while a shear screw riding in a longitudinal channel in the lower housing prevents rotation of the activating sleeve during its longitudinal movement prior to its contacting the double flapper valve assembly.
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Halliburton Services Sales and Service Catalog Number 41, pp. 3851 and 3852.
Dang Hoang C.
Halliburton Company
Novosad Stephen J.
Walkowski Joseph A.
Weaver Thomas R.
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