METHODS FOR RECOVERING NATURAL GAS USING NITROGEN REJECTION UNITS

摘要

A method and system for enhanced oil recovery by performing the steps of feeding a mixture of nitrogen from a primary nitrogen supply and an optional supplemental nitrogen supply into an oil field; separating recovered oil from a gas mixture comprising nitrogen, natural gas and C2+ hydrocarbons; feeding the gas mixture to a nitrogen rejection unit operating at elevated pressures; and recovering the nitrogen, natural gas and C2+ hydrocarbons. A method for the recovery of natural gas is also described herein.

主权项

1. A method for enhanced oil recovery comprising the steps of (a) feeding nitrogen from a primary nitrogen supply into an oil field; (b) recovering oil and a gas mixture comprising nitrogen, natural gas and C2+ hydrocarbons from the oil field; (c) separating the oil from the gas mixture (d) feeding the gas mixture to a nitrogen rejection unit; and (d) recovering nitrogen, natural gas and C2+ hydrocarbons.