RE:They will vent only nitrogen with a membrane techPlease look at their plant diagram presented on April 21. It shows that the residue is vented and the waste gas off the polishing unit is vented. So for the 10-1 well with 7% helium, that then is 93 percent of the gas out the vents and 7 percent to market on trucks
If the they were to put the co2 and gas back into another well in an approved disposal zone (you would not put it back into producer as you would be recycling the off revenue products), then the diagram would show collection of the vented streams, a compressor to compress the gas to pressure to remove nitrogen via membranes as you point out(too costly to inject all 93 percent), then another compressor to get to pressure to put down a disposal well(now you have really added cost ,power requireements to the project). The co2 and gas are a smaller volume so maybe you put it into trucks and take it somewhere. About as crazy as using trucks to transport other well gas to the facility according to the diagram.