For those who estimate the recoverable reserves of gas in a position to be the difference between the original gas in situ and the rest in place of abandonment, formula (25-5) or (25-6), the recovery factor obviously need not be predicted. But if the formula (25-7) is used by which the gas in place is multiplied by a factor of recovery, a prediction of R is necessary. Fortunately, recovery factors for the gas are not as variable as for oil recovery factors. Are generally higher, often in the range of 0.70 to 0.85. Calculations in this proximity can be safely used except in extremely poor reservoirs or where economic conditions do not justify continued production beyond the point where the reservoir pressure will force the gas produced in the pipeline.


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