SEsp is an expert system for aiding well drilling on salt rocks, whose conception is another partnership between LCCV and PETROBRAS. It is able to estimate creep closure rate of wells during drilling. These estimates can be quickly obtained based on the results of thousands of computer simulations performed with the support of the ANVEC simulator (Costa, 1984), widely used by PETROBRAS.
Based on experience acquired by PETROBRAS, a set of parameters and properties usually found on the Brazilian coast and on salt well drilling was defined. From this information, several reference models, with different characteristics, are generated by the Sigma2d modeler (Tecgraf/PUC-Rio and PETROBRAS) and analyzed numerically by the ANVEC simulator. Combining these simulation results, information about models which share some of those properties but which were not simulated can be inferred. The numerical simulations were performed on LCCV and CENPES/PETROBRAS clusters. Results About 30,000 different models are used as input. With this database, SEsp is able to quickly estimate closure rates of wells subjected to creep effect during drilling, which serve as an initial estimate to guide the drilling well design for oil exploration in the subsalt.