ABSTRACT:

Greenhouse gases (GHG) mitigation technologies are gaining increasing attention in the oil & gas industry and are starting to be employed by major stakeholders to reduce direct and indirect GHG emissions. Eni e&p is strongly committed to fight climate changes by developing a Carbon Management strategy that combines operational and management initiatives through both short and long-term projects. In the framework of short term activities energy efficiency initiatives to mitigate GHG emissions in our plants are here reported. In this paper the results of R&D activities - led by Engineering Department - targeting a reduction of CO2 emissions through increased energy efficiency of selected hydrocarbon treatment plants are given. Such GHG mitigation efforts comprise (1) development and test of an integrated plant model to quantitatively analyse the overall energy efficiency of production sites, (2) an energetic audit activity on selected assets and (3) identification of key GHG mitigation technologies. Targets 1-3 have been achieved by applying the developed model to two production assets located in Italy on the Adriatic coast, with the final aim of evaluating the current level of efficiency and identifying the most energy-effective plant configuration modifications. Through the analysis of the current configuration process data, key improvements are identified: namely, the introduction of heat recovery systems for electricity self-production and higher electrical efficiency devices would provide the most significant contribution to improve the asset energy efficiency. By applying these technologies, it is possible to increase the overall plants efficiency by up to 35%, thereby reducing significantly the amount of electrical power to be supplied by the electrical grid and the corresponding CO2 emissions. By employing heat recovery systems for electricity self-production, both sites can be electrically self-sufficient and part of the produced energy could be supplied to the power grid or provided to other company's production sites. An economic and financial analysis of the plants changes has been carried out, and the return on investment has been evaluated in the range of 4-7 years depending on the considered configuration. Based on the results of the present studies, this methodology shall be scaled up and applied to more complex assets. As part of these efforts, also non off-the-shelf technologies for mechanical energy recovery from HP-HT wells shall be studied and tested to reach our goal of improving the global efficiency of the upstream production cycle, from well to delivery point

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