E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 34/10 (2006.01) F16K 17/20 (2006.01) F16K 29/00 (2006.01)
Patent
CA 2635436
A control system for a surface controlled sub-surface safety valve has first and second control lines. The first control line communicates control fluid to the sub-surface safety valve and preferably has a sump and in-line filters. Hydraulic pressure applied to the safety valve with this first control line can open the safety valve. The second control line also communicates control fluid to the sub- surface safety valve and preferably has a sump. A connecting valve is connected between the first and second control lines. The connecting valve allows control fluid to communicate from the first control line to the safety valve but prevents fluid communication from the second control line to the first control line. To open the valve, the second control line is exhausted to a reservoir. The dual control lines provide redundant control of the safety valve and can also be cycled to remove debris from the system.
Dennistoun Stuart M.
Jones Richard C.
Smith Roddie R.
Goodwin Mckay
Weatherford/lamb Inc.
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