80mmCFpd was the during the test window. I doubt they can...

80mmCFpd was the during the test window. I doubt they can produce anywhere near that rate on a long sustained basis without damaging the reservoir. Even if they flow at 40mmCFpd, it would probably sustain for 3 to 4 years max before it goes into a decent decline. So they would need to drill at least 1 more production well in another part of SE1 compartment to tap into the recoverable reserve.

Assuming they produce 40mmCFpd from 2 wells and the recoverable reserve is indeed 128PJ, it will be drained after 10 or so years. They have sunk 20 odd million into SE1 already. Another 20mn say for the 2nd production well + 100mn for gas processing plant brings the total field dev cost to 140mn give or take. That's upfront cost in today's value. The revenue of around 90mn per annum needs to be discounted over 10 years. Off the top of my head, that's about 750mn.

On that basis, it may still be viable to have a standalone dev for SE but I suspect they will need to drill another well to gather additional field and well performance data before they will sink the upfront capex.

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