A Liquefied Energy Chain for Exploitation of Natural Gas, Capture and Injection of CO2 for EOR - Optimisation, Pinch and Exergy Analysis

The objective is to create an energy and cost effective transport chain for stranded natural gas for power production with CO2 capture including liquefaction and transport of CO2 to be injected in an oil field for EOR or an another suitable storage. The integrated liquefied energy chain consists of: - A novel offshore LNG process with cold recovery from CO2 and LIN - A combined gas carrier for LNG, CO2 and LIN - A novel integrated air separation process with cold recovery from LNG - An integrated oxyfue l power plant with CO2 capture and conditioning - A novel process for liquefaction of CO2 with cold recovery from LNG Utilization of the cryogenic energy in LNG, CO2 and liquid inert nitrogen, LIN, will, for the total chain, give higher overall energy ef ficiency and lower investment cost. It is possible to integrate these processes and obtain enhanced efficiencies, reduced capital costs and higher exploitations of our oil and gas resources with marginal CO2 emissions. The transport chain is especially suited for tail production of oil fields with associated gas, in where the gas is used for gas injection, as the use of CO2 for EOR will increase the lifetime of the oil field, thus also increase the oil production from the oil field. The natural gas will be sold as LNG and is therefore changed from a challenge to a valuable recourse Design and evaluation of complex energy processes and chains require the appropriate methodology. Pinch analysis can be used to develop the optimal heat exchanger network in a process. In cryogenic processes the temperature is closely related to the pressure. Hence it would be very convenient to have a pinch analyses tool which includes the effect of pressure. The aim is to include the effect of both temperature and pressure in an extended pinch analysis based on exergy calculations.It will include optimization of both the total energy chain and the sub processes. This requires specialization in computational technologies.