Grout fluids for use in a geothermal well loop
AssigneeHalliburton Energy Services, Inc.
InventorsEric Benjamin Frantz, Rebecca Marie Henry
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Abstract
A method of forming a set grout includes steps of preparing a grout additive fluid comprising a fresh water base fluid and a grout additive control package comprising a primary additive selected from the group consisting of an inhibitor, a dispersant, a thermally conductive material, and any combination thereof; introducing an aqueous swellable clay into the grout additive fluid, thereby forming a final grout fluid; and introducing the final grout fluid into an annulus in a subterranean formation, the annulus formed between an exterior of a geothermal well loop tubular and the subterranean formation. The ordering of additives in the method results in enhanced effectiveness of the additives, which may reduce the amount of additive loading required.
Claims20
A method comprising:
- (a) first, preparing a grout additive fluid comprising a fresh water base fluid and a grout additive control package comprising a primary additive comprising a salt-containing inhibitor and a dispersant, wherein the grout additive fluid is absent an aqueous swellable clay,
- wherein at least about 90% of the dispersant and the salt-containing inhibitor are dissolved in the fresh water base fluid;
- (b) second, introducing an aqueous swellable clay into the grout additive fluid, thereby forming a final grout fluid;
- and
- (c) third, introducing the final grout fluid into an annulus in a subterranean formation, the annulus formed between an exterior of a geothermal well loop tubular and the subterranean formation.
A method comprising:
- (a) first, preparing a grout additive fluid comprising a fresh water base fluid and a grout additive control package comprising a primary additive comprising a salt-containing inhibitor and a dispersant, wherein the grout additive fluid is absent an aqueous swellable clay,
- wherein at least about 90% of the dispersant and the salt-containing inhibitor are dissolved in the fresh water base fluid;
- (b) second, introducing an aqueous swellable clay into the grout additive fluid, thereby forming a final grout fluid,
- wherein the salt-containing inhibitor is present in an amount in the range of from about 0.001% to about 5% by weight of the final grout fluid,
- wherein the dispersant is present in an amount in the range of from about 0.001% to about 1% by weight of the final grout fluid,
- wherein a thermally conductive material is present in an amount in the range of from about 5% to about 75% by weight of the final grout fluid, and
- wherein the aqueous swellable clay is present in an amount in the range of from about 5% to about 40% by weight of the final grout fluid;
- and
- (c) third, introducing the final grout fluid into an annulus in a subterranean formation, the annulus formed between an exterior of a geothermal well loop tubular and the subterranean formation.
Dependencies are inferred from the claim text.