1
Dennis J Graue: Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking. World Energy Systems Incorporated, Arthur F Zobal, Geoffrey A Mantooth, December 11, 2001: US06328104 (288 worldwide citation)

A process is disclosed for the in situ conversion and recovery of heavy crude oils and natural bitumens from subsurface formations using either a continuous operation with one or more vertical injection boreholes and one or more vertical production boreholes in which multiple, uncased, horizontal bo ...


2
Armand A Gregoli, Daniel P Rimmer, Dennis J Graue: Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking. World Energy Systems Incorporated, January 25, 2000: US06016867 (282 worldwide citation)

A process is disclosed for the in situ conversion and recovery of heavy crude oils and natural bitumens from subsurface formations using either a continuous operation with one or more injection and production boreholes, which may include horizontal boreholes, or a cyclic operation whereby both injec ...