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The principle of injecting gases such as N 2 and CO 2 into oilfields to manage reservoir resources is well understood. The Yates Field — a mature site in West Texas — presented Kinder Morgan with particular difficulties, with the requirement to inject low pressure CO 2 with flow control and measurement at the well-head. The low pressure and high ambient temperatures lead to almost continuous flashing, with gas void fractions (GVFs) estimated to range between 0% and 80%. A solar and wind powered station was designed around a two-phase capable Coriolis mass flow meter. As well as metering the flow, the station controls it using a modulating valve, based on the two-phase flow measurement. A wireless communication system maintains contact with the central control. Some 20 stations have been operating successfully for four years, enabling effective reservoir management techniques.