variavel0=<b>Antonio C. Caputo</b> - caputo@ing.univaq.it University of L'Aquila
<b>Pacifico M. Pelagagge</b> - pelmar@ing.univaq.it University of L'Aquila
<b>Ivano Ponticiello</b> - ivanopx@hotmail.com University of L'Aquila
<b>Abstract.</b> The choice of gas separation and transportation mode in offshore applications may significantly affect the project profitability. Main alternatives are separation on board the platform with the utilization of separate subsea pipeline for single-phase gas and oil transportation, and remote separation with multiphase transportation of the gas-oil mixture in a single pipeline. In order to assist the project engineers during the feasibility study phase, the problem’s relevant technical and economic issues are analysed in this paper after preliminarily describing the two process schemes. In particular a computer model is developed in order to simulate the two-phase flow of the multi-component mixture adopting the Beggs and Brill model, which showed to be the most reliable approach in this application. A cost comparison with reference to a hypothetical but realistic case study is finally carried out to assess the convenience of the multiphase flow solution. This option appears to be especially attractive when multiple-well fields exist which can be developed in an integrated manner by providing a single centralized separation plant.
<b>Keywords.</b> Offshore technology, Gas - oil separation, Economic analysis, Natural gas production, Subsea pipeline.