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US 9,650,296 B2Granted
Nanoclay as an additive for high pressure and 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.
Claims15
A dry cement blend composition, comprising:
- hydraulic cement and an organically modified nanoclay in an amount of from 1% to less than 4% by weight of the hydraulic cement,
- 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, wherein the organically modified nanoclay is modified by a quaternary organo-ammonium salt and comprises nanolayers of less than 1 nm in thickness and about 2-10 microns in width or length.
Dependencies are inferred from the claim text.