Preparation of grout for stabilization of abandoned in-situ oil shale retorts
- Livermore, CA
A process for the preparation of grout from burned shale by treating the burned shale in steam at approximately 700.degree. C. to maximize the production of the materials alite and larnite. Oil shale removed to the surface during the preparation of an in-situ retort is first retorted on the surface and then the carbon is burned off, leaving burned shale. The burned shale is treated in steam at approximately 700.degree. C. for about 70 minutes. The treated shale is then ground and mixed with water to produce a grout which is pumped into an abandoned, processed in-situ retort, flowing into the void spaces and then bonding up to form a rigid, solidified mass which prevents surface subsidence and leaching of the spent shale by ground water.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4320994
- OSTI ID:
- 864159
- Country of Publication:
- United States
- Language:
- English
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70
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abandoned
alite
approximately
bonding
burned
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carbon
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flowing
form
ground
ground water
grout
in-situ
larnite
leaching
leaving
mass
materials
maximize
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oil
oil shale
preparation
prevents
prevents surface
process
processed
produce
production
pumped
removed
retort
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rigid
shale
shale retort
shale retorts
situ oil
situ retort
solidified
spaces
spent
spent shale
stabilization
steam
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surface
surface subsidence
treated
treating
void
void space
water