I like that it's simple to use and has good reporting features (i.e. data at all points). I mainly use it for compositional flow and the pressure drop results are quite accurate. Save my time by not having to do a CFD kind of simulation.
I have used Petrel for almost a decade and have enjoyed the effort put in by the software provider to stay current with developments in the oil and gas industry.
I very much like that the tool has evolved from being predominantly a niche three-dimensional earth modeling platform to a single source integrated subsurface evaluation environment.
For a small petroleum exploration and production company with potentially limited resources to patronize many software providers, it is possible to perform full subsurface evaluation, from seismic interpretation to reservoir simulation in Petrel. Pretty awesome!
Schlumberger is a supplier of technology, integrated project management and information solutions to customers working in the oil and gas industry worldwide.