It seams to have confusion here, Petrobras uses COMOS for Process Engineer, it's similar to VPE from AVEVA, with "intelligent" flow diagrams, Instruments data sheets, etc. And currently Petrobras has some applications of COMOS inside PDMS and PDS.
I think davetyner has asked about COSMOS, a Solid Works application with CAE technology for parts/assemblies calculation.
So, are different software but with similar names.