Nanoclay-enhanced cement composition for deep well treatment

Patent metadata

Field	Value
Publication number	US-10065890-B2
Application number	US-201715488049-A
Country	US
Kind code	B2
Filing date	Apr 14, 2017
Priority date	Dec 17, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

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:
silica flour,
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, and
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 an expanding agent, 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. The composition of claim 1 , wherein the amount of organically modified nanoclay ranges from 1 to 3.5 wt %.

7. The composition of claim 1 , wherein the amount of organically modified nanoclay ranges from 1.5 to 3.5 wt %.

8. 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.

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

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

11. The composition of claim 8 , wherein the water is fresh water or salt water.

12. A cured cement obtained by curing the composition of claim 8 .

13. A method for cementing a hydrocarbon-producing well under high pressure and high temperature (“HPHT”) comprising pumping the wet cement slurry composition of claim 8 into the well between a pipe casing and formation rock.

14. The method of claim 13 , wherein said hydrocarbon-producing well is under a pressure ranging from 7,000 to 10,000 psi and at a temperature of 250 to 350° F.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

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

Classifications

• C04B2111/00008

  Obtaining or using nanotechnology related materials · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C09K8/487

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

• C04B2103/0029

  Type A · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title