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US 5,332,040 AGranted
Process to cement a casing in a wellbore
AssigneeShell Oil Company
InventorsJames J. W. Nahm, Arthur H. Hale, Kenneth M. Cowan
Life of this patent
Estimating the term…
Abstract
A method of cementing a casing in a wellbore is provided wherein a cement slurry is placed in the wellbore prior to inserting the casing into the wellbore. Voids in the resultant cement caused by poor centralization are eliminated by placement of the cement in the wellbore prior to insertion of the casing.
Claims15
A method for cementing a wellbore, the method comprising the steps of:
- a) first placing a cementitious slurry comprising granulated water-quenched blast furnace slag in a wellbore;
- b) inserting a casing into the wellbore after said cementitious slurry is placed in said wellbore, said casing being substantially centralized in said wellbore;
- c) allowing the cementitious slurry to harden in the annulus surrounding the casing.
A method for cementing a wellbore, the method comprising the steps of:
- a) first placing a cementitious slurry comprising a polymer having acid functionality and a metal component selected from the group consisting of MgO and ZnO in a wellbore;
- b) inserting a casing into the wellbore after said cementitious slurry is placed in said wellbore, said casing being substantially centralized in said wellbore;
- c) allowing the cementitious slurry to harden in the annulus surrounding the casing.
Dependencies are inferred from the claim text.