Back to results
US 5,309,999 AGranted
Cement slurry composition and method to cement wellbore casings in salt formations
AssigneeShell Oil Company
InventorsKenneth M. Cowan, Arthur H. Hale, James J. W. Nahm
Life of this patent
Estimating the term…
Abstract
A method to cement wellbores in salt formations is provided using a cement slurry composition comprising blast furnace slag, water and salt. The salt improves compressive strength of blast furnace slag based cements. This method is useful in cementing wellbores within salt and potash formations because salt saturated cement slurries can be prepared without the need for expensive additives.
Claims17
A method to cement a cashing into a wellbore within a salt or potash formation comprising the steps of:
- a) providing a cement slurry comprising blast furnace slag, water and salt in an amount effective to essentially saturate the slurry with the salt and further comprising a polymer containing acid functional groups and a crosslinker which is a metal oxide;
- b) placing the cement slurry in the wellbore juxtaposed to the salt or potash formation;
- and
- c) allowing the cement slurry to set.
1 more element
A method to cement a casing into a wellbore within a salt or potash formation comprising the steps of:
- a) drilling the wellbore using a salt saturated drilling fluid;
- b) adding to a portion of the drilling fluid blast furnace slag in an amount effective to form a settable cement slurry and thereby forming a settable cement slurry;
- c) placing the cement slurry in the wellbore juxtapose to the salt or potash formation;
- and
- d) allowing the cement slurry to set.
2 more elements
Dependencies are inferred from the claim text.