Some typical deep water offshore reservoirs in Brazil requires the use some less expensive alternatives in order to make them economically attractive. In these cases we also need to reduce the development time including the perforation of the fields, the under water collecting system and the installation of the production units. These projects can also very affected according with the standing tax structure. It is also important to enforce that that offshore projects has a large impact on the social-economics of the country, not only for the generation of revenue form the tax income but also because of the job generation and for the needs of goods and services from the surrounding region. The present work has the objective to analyze a new numerical production algorithmic for offshore fields and also economic viability of the offshore fields based on the current tax structure.