System for producing a uniform rubble bed for in situ processes

System for undersea recovery of hydrocarbons

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

Underground in situ leaching of ore

Ventilation air and process air distribution for in situ oil sha

Water treatment and heating in spent shale oil retort

Withdrawal of gases and liquids from an in situ oil shale retort