Retarded acid soluble well cement compositions and methods
AssigneeHalliburton Company
InventorsPatty L. Totten, Bobby G. Brake, Edward F. Vinson
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Abstract
Retarded acid soluble well cement compositions which set into hard substantially impermeable masses and methods of using such compositions for forming removable cement plugs or seals in subterranean zones are provided. The compositions are comprised of magnesium oxychloride cement and a set retarder comprised of a water soluble borate and a sugar.
Claims16
A set retarded, acid soluble cement composition which sets into a hard, substantially impermeable mass comprising a water slurry of magnesium oxide, an aqueous magnesium chloride solution and a set retarder comprised of a water soluble borate and sugar selected from the group consisting of sucrose, lactose and dextrose;
- wherein
- said aqueous magnesium chloride solution contains in the range of from about 25 to about 34 percent magnesium chloride by weight of solution and said solution is present in said composition in an amount in the range of from about 0.05 to about 0.30 gallons of said solution per pound of magnesium oxide,
- said water soluble borate is present in said composition in an amount in the range of from about 0.02 to about 0.10 pounds per pound of magnesium oxide, and
- said sugar is present in said composition in an amount in the range of from about 0.01 to about 0.08 pounds per pound of magnesium oxide.
A set retarded, acid soluble cement composition which sets into a hard, substantially impermeable mass comprising a pumpable slurry of magnesium oxide, an aqueous magnesium chloride solution containing about 27 percent by weight magnesium chloride wherein said magnesium chloride solution is present in an amount of about 0.16 gallons per pound of magnesium oxide and a set retarder comprised of a water soluble borate present in the amount in the range of from about 0.02 to about 0.08 pounds per pound of magnesium oxide and a sugar selected from the group consisting of sucrose, lactose and dextrose present in an amount in the range of from about 0.01 to about 0.06 pounds per pound of magnesium oxide.
Dependencies are inferred from the claim text.