Methods for shortening waiting-on-cement time in a subterranean well
AssigneeSchlumberger Technology Corporation
InventorsDominic Perroni, Bipin Jain, Anatoly Vladimirovich Medvedev, Carlos Abad, Christopher Daeffler
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Abstract
Methods for shortening the waiting-on-cement (WOC) time during primary and remedial cementing operations are disclosed. A fluid pill is injected into the wellbore that comprises reactants. The reaction is exothermic and heat is conducted into the cement sheath, thereby accelerating hydration and shortening the time necessary for the slurry to set and harden.
Claims20
A method of reducing a setting time of a cement slurry, the method comprising:
- placing a cement slurry in an interior of a casing;
- when the cement slurry is in the interior of the casing, introducing a fluid pill to the interior of the casing to displace the cement slurry to an annular region of the casing, the fluid pill comprising reactants formulated to exothermically react to generate heat;
- and
- heating the cement slurry in the annular region through the casing to reduce the setting time of the cement slurry using the heat from the exothermic reaction.
A method of reducing a setting time of a cement slurry, the method comprising:
- pumping a cement slurry in an interior of a drill pipe or coiled tubing in an interior of a casing;
- displacing the cement slurry to an annular region of the casing;
- introducing a fluid pill to the interior of casing through the drill pipe or coiled tubing, the fluid pill comprising reactants formulated to exothermically react to generate heat;
- and
- heating the cement slurry in the annular region of the casing to reduce the setting time of the cement slurry using the heat from the exothermic reaction.
A method of plug cementing in a wellbore, the method comprising:
- placing a viscous fluid support in an open hole extending through a subterranean formation;
- placing a volume of a cement slurry on the viscous fluid support;
- injecting a reactive fluid pill above the cement slurry, the reactive fluid pill comprising reactants formulated to exothermically react;
- and
- heating the cement slurry with heat from the exothermic reaction of the reactants of the reactive fluid pill.
Dependencies are inferred from the claim text.