The LLNL RISE process was an experimental shale oil extraction technology developed by the Lawrence Livermore National Laboratory.
The name comes from the abbreviation of the Lawrence Livermore National Laboratory and words 'rubble in situ extraction'.
[1] LLNL RISE is a modified in situ extraction technology originally proposed by Rio Blanco Oil Shale Co. and developed by the Lawrence Livermore National Laboratory.
The combustion zone moves downward as an oxygen gas provided, similar to the process developed by the Occidental Petroleum.
It was tested by using experimental simulated retort with capacity of 6 tonnes of oil shale per day.