Wellhead safety valve control system

Details Wellhead safety valve control system Wellhead safety valve control system

1998-11-17

2000-09-12

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

1374925, 499 6, F16K 1700

Patent

active

06116268&

ABSTRACT:
A wellhead safety valve control system for opening and closing subsurface and surface safety valves in a predetermined sequence and certain components used with such control system. Dump valves in both latching and non-latching configurations are utilised within the control system. Embodiments of the dump valve may incorporate a time delay feature to ensure the subsurface safety valve is closed after a desired time period following the closure of the surface safety valve in the event of flowline anomalies. Provision is made for independent closure of the surface safety valve without closure of the subsurface safety valve.

REFERENCES:
patent: 5341837 (1994-08-01), Johnson
patent: 5526883 (1996-06-01), Breaux
"Baker CAC" brochure. 3 page brochure. 1989-1990.
Enerpac "High Force Hydraulic Tools" brochure. 3 page brochure. 1994.
"Power Team" brochure. 3 page brochure. 1997.
3-Way Indicating Hydraulic Controller, Sigma Enterprises Inc., (2 pages) "Sigma Enterprises Inc." brochure. 3 page brochure. 1995.
Pages 5380 and 5381 from a trade brochure entitled "Page Oil Tools". Date Unknown.
Page 10 from a trade brochure entitled "Otis Surface Safety Equipment and Systems". Date Unknown.
Technical Bulleting entitled Barber Hydraulic Pilot, Model "2L-H+L-T1-B6" by Barber Industries Ltd., dated Feb. 24, 1993.

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