This study presents a comparative evaluation of a Floating Gas to Liquid Facility (FGTL) and a Floating Liquid Natural gas Facility (FLNG) as a way to monetize Associated Gas (AG) from existing oil producing offshore fields or from remote offshore gas fields. The study aims at showing that the FGTL is an option to be considered as a way to monetize AG. For this purpose, a previous study presented to the OMAE under OMAE2016 – 55152 is used for the FLNG with one liquefaction train for nitrogen refrigerant. This FLNG concept serves as a benchmark to evaluate the technical and economic relevance of the FGTL through the Net Present Value (NPV) of the Life Cycle Cost (LCC). The LCC compares the difference between the FGTL and the FLNG NPVs on the basis of a selling price for the gasoline of 1.4, 2.0 and 2.4 USD/Gal with a price for the LNG varying from 3.5 to 7.5 USD/MMBTU. The AG FGTL is presented in detail with a capacity of 6,000 bpd of gasoline (methanol production being an option to Gasoline). Natural gas is converted into gasoline by a proprietary natural gas to Liquids technology awarded with AIP (Approval In Principal) by ABS for off-shore GTL, which includes five principal steps in one continuous gas-phase process loop using only standard components: (1) Steam Methane Reforming; (2) Methanol Synthesis; (3) Gasoline Synthesis; (4) Gasoline Treatment; (5) Separation. This proprietary technology has several advantages over other GTL technologies including single product, long catalyst lifetime and higher allowable levels of CO2 in AG. Gasoline produced using a proprietary natural gas to Liquids technology can be blended with refinery gasoline or sold directly into the wholesale market.
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