Retarded acid soluble well cement compositions and methods
AssigneeHalliburton Company
InventorsPatty L. Totten, Bobby G. Brake, Edward F. Vinson
Life of this patent
Estimating the term…
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.
Claims6
A method of forming a cement plug or seal in a subterranean zone penetrated by a well bore which can subsequently be removed by dissolution in acid comprising:
- pumping a set retarded acid soluble cement composition which sets into a hard substantially impermeable mass into said zone comprised of magnesium oxide, an aqueous magnesium chloride solution and a set retarder comprised of a water soluble borate and a sugar selected from the group consisting of sucrose, lactose and dextrose;
- and
- allowing said cement composition to set in said zone.
The method of claim wherein said cement composition further comprises a foaming agent selected from the group consisting of alcohol sulfates, ethoxylated alcohol sulfates and salts thereof.
Dependencies are inferred from the claim text.