Commingling in this sense is mixing it BEFORE the sales point, custody point, whatever. Everybody has to stack hands and agree that the operator can sell the combined fluids so nobody is suing anybody over how many molecules belong to whom. Yes, gas from many wells goes to a gas plant, but that occurs AFTER the custody transfer. So nobody cares whose gas is whose, it’s already been measured in a way in which the operator and gatherer agree and all of the gas belongs to the gas plant at that point. Subtle difference as yeah, you have to do some allocation/composition math to allocate NGLs, but nobody is getting contacted for their approval to commingle their gas at a gas plant.
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