With 400mcf/d x 0.3% thats only 1.2mcf/day of helium or 438mcf/year. The BNL proposed modules can do 50000mcf (50mmcf) output of helium per year. So doing the math (50000/438) you'd need 114 wells if all the same 400mcf/d at 0.3%. It's US$2.5m per 5 wells and US$15m for the module. So well costs really blow out at 0.3% at flow rates of 400mcf/d if my calculations are right.
Hence both flow rates and helium percentages are equally important I believe as combined they determine the helium output.
I think its Air Products at Doe Canyon in the US who are getting 20mmcf/day flow rates.
Maybe 0.3% to be commercially viable I remember seeing in an academic paper but not sure what flow rates apply to that.
Bear in mind 20mmcfd (20000mcf/day) is 50 times the flow rate of 400mcf/day so it appears there can be big variations in flow rates from gas field to gas field.
With 400mcf/d x 0.3% thats only 1.2mcf/day of helium or...
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