Nanoclay as an additive for high pressure and high temperature well cementing

Patent metadata

Field	Value
Publication number	US-9650296-B2
Application number	US-201414573728-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Dec 17, 2014
Publication date	May 16, 2017
Grant date	May 16, 2017

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

The invention claimed is:

1. 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.

2. The composition of claim 1 , 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.

3. The composition of claim 1 , 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.

4. The composition of claim 1 , wherein the hydraulic cement is a Saudi Type G hydraulic cement.

5. The composition of claim 1 , wherein the organically modified nanoclay has a mean particle size of 6 to 10 microns.

6. A wet cement slurry composition, comprising water and the composition of claim 1 , wherein a weight ratio of the water:the hydraulic cement is 0.4-0.5.

7. The composition of claim 6 , which has a density of 8-20 lb/gal.

8. The composition of claim 6 , which has a plastic viscosity of 131-245 CP.

9. The composition of claim 6 , wherein the water is fresh water or salt water.

10. A method for cementing a high pressure high temperature well, comprising:
pumping the wet cement slurry composition of claim 6 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.

11. The method of claim 10 , wherein the wet cement slurry composition is in contact with portions of the well, wherein a bottom hole static temperature exceeds 290° F. and a bottom hole pressure exceeds 10,000 psi.

12. The method of claim 10 , wherein the wet cement slurry composition further comprises silica flour in the range of 30 to 40% by weight of the hydraulic cement.

13. The method of claim 10 , wherein the water is fresh water or salt water.

14. The method of claim 10 , wherein the organically modified nanoclay is surface treated with the quaternary organo-ammonium salt and has a mean particle size of 6 to 10 microns.

15. The method of claim 10 , wherein a density of the wet cement slurry composition ranges from 10 lbs per gallon to about 20 lbs per gallon.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

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

Classifications

• C04B2103/50

  Defoamers, air detrainers · CPC title

• C04B2103/20

  Retarders · CPC title

• C04B2103/0029

  Type A · CPC title

• C04B2103/0036

  Type H · CPC title

• C04B14/062

  Microsilica, e.g. colloïdal silica (preparing microsilica slurries or suspensions C04B18/148) · CPC title