Spent oil shale compositions and use
AssigneesStandard Oil Company (Indiana), Gulf Oil Corporation
InventorsMaurice Guillaud, Paul H. Bissery
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Abstract
A slurry composition and method of using the same is provided which is particularly useful in filling spent in situ oil shale retorts to form a strong load bearing mass which minimizes surface subsidence. The slurry is formed by mixing spent oil shale with 50 to 300 weight percent water and at least one material selected from the group consisting of lignosulfonate, sodium silicate, and sodium gluconate. The maximum concentration of each material selected is 4 weight percent based on the spent oil shale.
Claims17
A composition for use in filling spent in situ oil shale retorts and mined out areas as well as for a base for roads, comprising:
- (a) combusted spent oil shale;
- (b) from about 50 weight percent to about 300 weight percent water based on said combusted powdered spent oil shale;
- and
- (c) at least one material selected from the group consisting of lignosulfonate, sodium silicate and sodium gluconate, wherein the maximum concentration of each material selected is 4 weight percent based on said combusted powdered spent oil shale.
A method for enhancing stabilization of a spent in situ oil shale retort, comprising the steps of:
- forming a slurry by mixing combusted powdered spent oil shale with 50 percent to 300 percent by weight of water and at least one material selected from the group consisting of lignosulfonate, sodium silicate and sodium gluconate, wherein the maximum concentration of each material selected is 4 percent by weight of said combusted powdered spent oil shale;
- and
- introducing a sufficient amount of said slurry into a spent in situ oil shale retort at a temperature ranging from 32.degree. F. to 212.degree. F. and thereafter allowing said slurry to set and solidify to form a generally coherent load bearing mass to strengthen said spent in situ oil shale retort and minimize surface subsidence.
Dependencies are inferred from the claim text.