Development of offshore high carbon dioxide (CO2) gas fields will indisputably pose significant new challenges for all E&P companies in the world. Acid gas removal from natural gas is an indispensable treatment process that is required to boost the produced gas quality prior to its utilisation. The use of membrane units has increased in natural gas treatment plants, particularly for acid gas removal. Such technology shows tremendous advantages over other conventional methods in terms of removal efficiency, compactness, and environmental friendliness.