Gas injection wellhead valve open/close sequence
Gas injection wellhead valve open/close sequence
(OP)
The gas injection wellhead consists of hydraulically actuated wing valve (WV) followed by surface safety valve (SSV) and sub-surface safety valve (SSSV). We have to define the closing and opening sequence of these wellhead valves. The following sequence was proposed in the design manual: First close the SSSV, followed by SSV and then WV. The opening sequence was reverse that of the closing sequence i.e., first open the WV, followed by SSV and then SSSV. But there is difference of opinion to follow exactly the opposite of that proposed above which is normally followed for a oil producer wellhead.
Please advise the correct operating sequence of a gas injection wellhead valves.
Please advise the correct operating sequence of a gas injection wellhead valves.





RE: Gas injection wellhead valve open/close sequence
Personally I would close WV, SSV then SSSV (only closed if you have a fire or level 1 ESD) and opened in reverse sequence. If the WV is closing on flow, then it is the most likely to gradually wear and leak, but the easist to replace / repair. Flow direction doesn't realy matter.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Gas injection wellhead valve open/close sequence
Thanks for your valuable insight into my query.
RE: Gas injection wellhead valve open/close sequence
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way