Nanoclay as an additive for high pressure & high temperature well cementing
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMuhammad Kalimur RAHMAN, Mobeen MURTAZA, Abdulaziz Abdalla AL-MAJED, Mesfer Mohammed AL-ZAHRANI
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Abstract
A cement slurry composition, containing hydraulic cement, water, and from 1 to less than 4% of an organically modified nanoclay. A method for cementing a high pressure high temperature well by pumping the cement composition of claim 1 between a casing and a formation of a well bore to fill a gap between the casing and the formation, and allowing the cement to harden.
Claims17
1:
- A cement slurry composition, comprising hydraulic cement, water, and from 1 to less than 4% of an organically modified nanoclay.
The composition of claim 1, wherein the cement is admixed with at least one additive selected from the group consisting of silica flour, a fluid loss control additive, retarder, expanding agent, density reducing additive, density enhancing weighting agent, friction reducing agent, defoaming agent, and foaming agent.
The composition of claim 1, wherein the composition further comprises Class G cement powder, silica flour, expanding agent, dispersant, fluid loss control agent, retarder, and defoamer.
The composition of claim 1, wherein a water to cement ratio is from 0.4 to 0.5.
The composition of claim 1, wherein the organically modified nanoclay is a montmorillonite nanoclay formed from chlorite clay mineral having octahedral sheets, where Fe or Mg is a central cation.
The composition of claim 1, wherein an amount of nanoclay, based on 100% of the composition, is from ≧1 to <4%.
The composition of claim 1, wherein the hydraulic cement comprises API Class A, H, and G cement.
The composition of claim 1, wherein the cement composition further comprises silica flour in the range of 30 to 40% by weight of the cement.
The composition of claim 1, wherein the hydraulic cement comprises Saudi Type-G cement.
A method for cementing a high pressure high temperature well, comprising:
- pumping a cement composition comprising hydraulic cement, water, and from 1 to less than 4% of an organically modified nanoclay, between a casing and a formation of a well bore to fill a gap between the casing and the formation;
- and
- allowing the cement to harden.
Dependencies are inferred from the claim text.