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.
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