Super-hydrophobic, thermally insulating, thermal-shocks resistant well cement composites for completion of geothermal wells at hydrothermal temperatures of up to 300° C
AssigneeBrookhaven Science Associates, LLC
InventorsTatiana Pyatina, Toshifumi Sugama
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Abstract
A well cement composite and a method for making a well cement composite includes a mixture of calcium aluminate cement (CAC) and fly ash cenospheres (CS) in a weight ratio of from 30:70 to 80:20 CAC to CS; sodium metasilicate (SMS) in an amount of from 1 to 10% of the total weight of the mixture of CAC and CS; polymethylhydrosiloxane (PMHS) in an amount of from 0.5 to 6.0% of the total weight of the mixture of CAC and CS; and water in a weight ratio of from 0.5:1.0 to 1.2:1.0 of water to CAC and CS.
Claims20
A well cement composite comprising:
- a mixture of calcium aluminate cement (CAC) and fly ash cenospheres (CS) in a weight ratio of from 30:70 to 80:20 CAC to CS;
- sodium metasilicate (SMS) in an amount of from 1 to 10% of the total weight of the mixture of CAC and CS;
- polymethylhydrosiloxane (PMHS) in an amount of from 0.5 to 6.0% of the total weight of the mixture of CAC and CS;
- and
- water in a weight ratio of from 0.5:1.0 to 1.2:1.0 of water to CAC and CS.
A well cement composite comprising:
- a mixture of calcium aluminate cement (CAC) and fly ash cenospheres (CS) in a weight ratio of from 30:70 to 80:20 CAC to CS;
- sodium metasilicate (SMS) in an amount of from 1 to 10% of the total weight of the mixture of CAC and CS;
- a siloxane with at least one hydrophobic functional group in an amount of from 0.5 to 6.0% of the total weight of the mixture of CAC and CS;
- and
- water in a weight ratio of from 0.5:1.0 to 1.2:1.0 of water to CAC and CS.
A method of making a well cement composite comprising:
- mixing polymethylhydrosiloxane (PMHS) with an aqueous solution of sodium metasilicate (SMS) to form an emulsion;
- mixing fly ash cenospheres (CS) into the emulsion to release hydrogen gas and form a paste;
- adding calcium aluminate cement (CAC) and water to the paste and mixing to form the well cement composite,
- wherein the well cement composite comprises calcium aluminate cement (CAC) and fly ash cenospheres (CS) in a weight ratio of from 30:70 to 80:20 CAC to CS, sodium metasilicate (SMS) in an amount of from 1 to 10% of the total weight of CAC and CS, polymethylhydrosiloxane (PMHS) in an amount of from 0.5 to 6.0% of the total weight of CAC and CS, and water in a weight ratio of from 0.5:1.0 to 1.2:1.0 of water to CAC and CS.
Dependencies are inferred from the claim text.