Failure surface model for oil shale
Technical Report
·
OSTI ID:6077001
One promising means of recovering oil from oil shale is to retort the shale in situ. Currently, modified in situ technology requires the construction of extensive underground openings or retorts. The remaining media (structure left around these retorts must support the overburden and contain the retorting shale. A failure criterion for oil shale, which is presented in this paper, was developed so that regions in the retort structure where the shale may be approaching failure can be identified. This criterion, adapted from composite materials applications, is essentially a closed surface in six-dimensional stress space and makes it possible to describe the anisotropic nature of failure in layered materials. The failure surface can be defined by five parameters which are determined from five simple laboratory tests. The surface is developed for a 80 ml/kg kerogen content shale and its features are discussed in detail. The predictions of the model are found to be in agreement with the results of a large number of laboratory tests, including uniaxial and triaxial compression tests. One unique (for rocks) test series is discussed which involves the failure of thin-walled tubes under combined compression and torsion. Finally, it is shown how the model can be extended to include the variation of material properties with kerogen content and temperature.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6077001
- Report Number(s):
- SAND-81-1128; ON: DE81030987
- 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 COMPOSITION
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMPRESSION
DECOMPOSITION
DISTILLATION EQUIPMENT
ENERGY SOURCES
EQUIPMENT
FAILURES
FOSSIL FUELS
FUELS
IN-SITU PROCESSING
IN-SITU RETORTING
KEROGEN
MATERIALS
OIL SHALES
ORGANIC MATTER
PRESSURE DEPENDENCE
PROCESSING
RETORTING
RETORTS
TEMPERATURE DEPENDENCE
TORSION
040401* -- Oil Shales & Tar Sands-- In Situ Methods
True & Modified
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMPRESSION
DECOMPOSITION
DISTILLATION EQUIPMENT
ENERGY SOURCES
EQUIPMENT
FAILURES
FOSSIL FUELS
FUELS
IN-SITU PROCESSING
IN-SITU RETORTING
KEROGEN
MATERIALS
OIL SHALES
ORGANIC MATTER
PRESSURE DEPENDENCE
PROCESSING
RETORTING
RETORTS
TEMPERATURE DEPENDENCE
TORSION