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Method for inhibiting sloughing of unfragmented formation in an in-situ oil shale retort

Patent ·
OSTI ID:6430488

A method for igniting an in situ oil shale retort containing a fragmented permeable mass of formation particles containing oil shale is provided. A void space is in the retort between the top surface of the fragmented mass and the top boundary of overlying unfragmented formation. A hot ignition gas comprising oxygen is introduced into the void space to form a combustion zone across the surface of the fragmented mass. An oxygen-supplying gas is then introduced into the void space for sustaining the combustion zone and for advancing the combustion zone downwardly through the retort. The combustion zone is then extinguished and a cool inert gas is introduced into the retort to cool carbonaceous materials comprising the surface of the fragmented mass to a temperature below the self-ignition temperature of such carbonaceous materials, while leaving carbonaceous materials below the fragmented mass surface at temperatures greater than the self-ignition temperature of such materials. Introduction of the inert gas is then discontinued. Thereafter, an oxygen-supplying gas is re-introduced into the retort to ignite the carbonaceous materials below the surface of the fragmented mass for re-establishing the combustion zone in the fragmented mass and for advancing the combustion zone downwardly through the retort.

Assignee:
Occidental Research Corporation
Patent Number(s):
US 4444256
OSTI ID:
6430488
Country of Publication:
United States
Language:
English

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Related Subjects

04 OIL SHALES AND TAR SANDS
040401* -- Oil Shales & Tar Sands-- In Situ Methods
True & Modified
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMBUSTION
COMBUSTION WAVES
DECOMPOSITION
DISTILLATION EQUIPMENT
ENERGY SOURCES
ENHANCED RECOVERY
EQUIPMENT
FLUID INJECTION PROCESSES
FOSSIL FUELS
FUELS
IGNITION
IN-SITU COMBUSTION
IN-SITU PROCESSING
IN-SITU RETORTING
MASS TRANSFER
MATERIALS
OIL SHALES
OXIDATION
PARTICLE SIZE
PERMEABILITY
PROCESSING
RECOVERY
RETORTING
RETORTS
SEDIMENTATION
SIZE
THERMAL RECOVERY
THERMOCHEMICAL PROCESSES