Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1993-07-20
1994-08-23
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137853, 251 5, F16K 1514
Patent
active
053398645
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 having three or more depressions surrounding a central bore. When internal drilling pressure drops, the external pre-charge pressure closes the elastomeric material by creating a cusp opposite each depression, the cusps closing together. The metallic end pieces of the cartridge and parallel round connecting rods between these inserts are bonded to the elastomeric material during the molding process. Thus, the cusps are precisely formed between the rod locations, resist tearing loose from the rods and the metallic end pieces even after many operations and the material becomes fatigued, and the end pieces do not translate longitudinally during the closing operation to further extend elastomer wear. Having at least three depression/cusp sections also causes the material to undergo less angle of buckling than with an elastomeric cartridge having only a twin buckling mode.
REFERENCES:
patent: 3342215 (1967-09-01), Griffin
patent: 3365009 (1968-01-01), Burnham
patent: 3955594 (1976-05-01), Snow
patent: 4811758 (1989-03-01), Piper
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.
Carbaugh William L.
Carlson Douglas W.
Hydril Company
Nilson Robert G.
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