Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1994-10-13
1996-06-18
Dang, Hoang C.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
1374925, 166 53, E21B 3416, E21B 4312
Patent
active
055268838
ABSTRACT:
Apparatus and method of controlling a surface safety valve and a subsurface safety valve in a producing hydrocarbons well, comprising: providing a self contained control circuitry including a reservoir for a hydraulic fluid; sensing a drop below a pre-established level of pressure in a flowline distal to the surface safety valve and a drop below a pre-established level of pressure in a portion of a hydraulic circuit fluidly connected to a subsurface safety valve proximal to the subsurface safety valve, and responsive to sensing a drop of the pressure in either the flowline or the circuitry proximal to the subsurface valve: first draining fluid to the reservoir from a portion of the circuitry means hydraulically maintaining the surface safety valve open, then after a first time delay sufficient for closure of the surface safety valve, secondly draining fluid to the reservoir from a portion of the circuitry means hydraulically maintaining the subsurface safety valve open, and then after a second time delay sufficient for closure of the subsurface safety valve, thirdly isolating the subsurface safety valve at least from the portion of the circuitry means proximal to a subsurface safety valve.
REFERENCES:
patent: 3856037 (1974-12-01), Garrett et al.
patent: 3970144 (1976-07-01), Boykin, Jr.
patent: 4062379 (1977-12-01), Clinton
patent: 4082147 (1978-04-01), Wolff et al.
patent: 4091832 (1978-05-01), Snyder et al.
patent: 4215746 (1980-08-01), Hallden et al.
patent: 4319603 (1982-03-01), Snyder
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patent: 4774980 (1988-10-01), Etheridge
"Baker Oil Tools Safety Systems" brochure exerpts, pp. 38, 40, 46, 54-57 and endpage bearing date Dec. 1992.
Baker CAC printed materials "884-01 Single-well control panel" with date Nov. 1, 1981 and pp. 695, 696, 702-705.
Burgess Tim L.
Dang Hoang C.
Safoco, Inc.
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