no mention of the substitution of butane in place of water.
The reason for using butane is not to lower the amount of water usage which it does, it’s to be able to blow down into the sale line and recover some of the cost. We do CO2 fracs and it may take a week or more to blow all the CO2 out of the well before we can send gas down the sale line. With CO2 you vent back to the atmosphere and all money is lost, with butane you can sale it back to the gas company.