Recently, a new research initiative, Advanced Cuttings Transport Study (ACTS), has been undertaken by the University of Tulsa. The ACTS research program calls for the construction of a new research facility, Advanced Cuttings Transport Facility (ACTF), which will allow investigation of cuttings transport with compressible drilling fluids at elevated temperature (200 ?F) and elevated pressure (2000 psi). The basic construction of the facility is completed and currently the loop is operational under elevated pressure Modification to the ACTF will continue by adding elevated temperature capability (1999), aeration and foam capability (2000), cuttings transfer capability (2001), pipe rotation capability (2002) and finally, elevation capability (2003). Development and utilization of the ACTF will offer the industry a unique insight into the complex processes that govern fluid flow during drilling and production phases. The Tulsa University ACTS research program will provide valuable information to optimize underbalanced drilling technologies.