Back to results
US 5,213,161 AGranted
Well cementing method using acid removable low density well cement compositions
AssigneeHalliburton Company
InventorsBobby J. King, Patty L. Totten
Life of this patent
Estimating the term…
Abstract
Low density well cement compositions which set into hard substantially impermeable masses, but which are removable by dissolution in acid, and methods of utilizing such compositions for forming removable cement plugs or seals in subterranean zones are provided. The compositions are comprised of pumpable foamed slurries of magnesium oxychloride cement.
Claims9
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 low density cement composition which sets into a hard substantially impermeable mass into said zone comprised of magnesium oxide, an aqueous magnesium chloride solution, calcium carbonate filler, a foaming agent, a foam stabilizer and a gas entrained in said slurry in an amount sufficient to obtain a desired slurry density;
- and
- allowing said cement composition to set in said zone.
Dependencies are inferred from the claim text.