Safety sub with asymmetrical wall elastomeric closure for retain

Details Safety sub with asymmetrical wall elastomeric closure for retain Safety sub with asymmetrical wall elastomeric closure for retain

1994-03-15

1994-11-15

Fox, John C.

Valves and valve actuation

Tube compressors

Fluid pressure actuated

166326, F16K 707

Patent

active

053640640

ABSTRACT:
A safety sub is disclosed for retaining drilling fluid in the kelly or equivalent and other components of the mud system located above the drill string when pressure drops in the drill string, such as when the circulation pump is turned off in adding a new joint to the drill string. The safety sub includes a pressurized elastomeric cartridge with an elastomeric closure having an asymmetrical wall thickness, preferably achieved by the removal of a chord of material from its external circumference. When internal drilling pressure drops, the external pre-charge pressure closes the elastomeric material by inwardly collapsing the thinner wall portion of the closure. The metallic end pieces of the cartridge are bonded to the elastomeric material during the molding process.

REFERENCES:
patent: 3039733 (1962-06-01), Mattioli
patent: 4111391 (1978-09-01), Pilolla
patent: 4811758 (1989-03-01), Piper
patent: 5165493 (1992-11-01), Bargh
patent: 5186431 (1993-02-01), Tamari
patent: 5205325 (1993-04-01), Piper
National-Oilwell PS & PS2-500/500 Power Swivel, "Kick" Down Hole Pressure Control, Document No. 05-05-00, Undated.
National-Oilwell PS 500/500 & PS2 500/500 Power Swivel, Internal Blowout Preventer (IBOP) Assembly, Document No. 10-40-03, Undated.

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