Temporary gas seal for gas level drift of an in situ oil shale r
Thermal recovery of viscous hydrocarbons using arrays of radiall
Thermal--mining method of oil production
Thermal-mine oil production method
Triangular blasting into limited voids for vertical free face re
Two-level, horizontal free face mining system for in situ oil sh
Two-pass method for developing a system of in situ oil shale ret
Two-stage oil shale retorting process and disposal of spent oil