Nanoclay-enhanced cement composition for deep well treatment

Patent metadata

Field	Value
Publication number	US-2017240469-A1
Application number	US-201715488049-A
Country	US
Kind code	A1
Filing date	Apr 14, 2017
Priority date	Dec 17, 2014
Publication date	Aug 24, 2017
Grant date	—

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.

First claim

1 - 17 . (canceled)

18 : A dry cement blend composition, comprising:
silica, a dispersant, a hydraulic cement and an organically modified nanoclay, wherein the organically modified nanoclay is present 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.

19 : The composition of claim 18 , further comprising at least one additive selected from the group consisting of silica flour, an expanding agent, a dispersant, a fluid loss control agent, a retarder, a defoamer, a density reducing additive, a density enhancing weighting agent, a foaming agent, and a friction reducing agent.

20 : The composition of claim 18 , wherein the hydraulic cement is at least one selected from the group consisting of an API class A Portland cement, an API class H Portland cement, and an API class G Portland cement.

21 : The composition of claim 18 , wherein the hydraulic cement is a Saudi Type G hydraulic cement.

22 : The composition of claim 18 , wherein the organically modified nanoclay has a mean particle size of 6 to 10 microns.

23 : A wet cement slurry composition, comprising water and the composition of claim 18 , wherein a weight ratio of the water:the hydraulic cement is 0.4-0.5.

24 : The composition of claim 23 , which has a density of 8-20 lb/gal.

25 : The composition of claim 23 , which has a plastic viscosity of 131-245 CP.

26 : The composition of claim 23 , wherein the water is fresh water or salt water.

27 : A cured cement obtained by curing the composition of claim 23 .

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Rahman Muhammad Kalimur
• Murtaza Mobeen
• Al-Majed Abdulaziz Abdalla
• Al-Zahrani Mesfer Mohammed

Classifications

• C09K8/487

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• C04B2111/00008

  Obtaining or using nanotechnology related materials · CPC title

• C09K8/473

  Density reducing additives, e.g. for obtaining foamed cement compositions · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B2103/0035

  Type G · CPC title