Co-grinding slag with other material for hydraulic binders

Patent metadata

Field	Value
Publication number	US-10703958-B2
Application number	US-201616072133-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2016
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A variety of systems, methods and compositions are disclosed for cementing in subterranean formations. Embodiments may include the use of slag co-grind in well cementing operations.

First claim

What is claimed is:

1. A method of cementing comprising:
first, co-grinding a composition consisting of slag and at least one cement component selected from the group consisting of metakaolin, shale, perlite, pozzolan, zeolite, calcium aluminate cement, and combinations thereof, to form a slag co-grind, wherein the slag is a by-product from processing of a metal ore;
second, dry blending the slag co-grind and a cement to form a cement dry blend;
thereafter, preparing a cement composition comprising water and the cement dry blend and introducing the cement composition into a subterranean formation; and
allowing the cement composition to set in the subterranean formation.

2. The method of claim 1 , wherein the slag co-grind has a final particle size of about 1 nanometer to about 1 micron.

3. The method of claim 1 , wherein the slag co-grind is present in an amount of about 1% to about 99% by weight of cementitious components.

4. The method of claim 1 , wherein the step of introducing the cement composition into a subterranean formation comprises introducing the cement composition into a wellbore annulus in a primary cementing operation.

5. The method of claim 1 , wherein the cement composition further comprises at least one component selected from the group consisting of strength-retrogression additives, set accelerators, set retarders, weighting agents, lightweight additives, gas-generating additives, mechanical property enhancing additives, lost-circulation materials, filtration-control additives, dispersants, a fluid loss control additive, defoaming agents, foaming agents, thixotropic additives, and combinations thereof.

6. The method of claim 1 , further comprising grinding the slag co-grind in a ball mill.

7. The method of claim 6 , wherein the ball mill comprises a ball charge comprising balls of different sizes.

8. The method of claim 1 , further comprising grinding the slag co-grind in a grinder selected from the group consisting of rod mill, autogenous mill, semi-autogenous mill, pebble mill, high pressure grinding roll, buhrstone mill, vertical shaft impactor mill, and tower mill.

9. The method of claim 1 , wherein the slag co-grind is further separated by sieving after grinding.

10. The method of claim 1 , wherein the slag co-grind further comprises a basic material.

11. The method of claim 1 , further comprising dry blending the slag co-grind and the cement.

12. A system for cementing in a subterranean formation comprising:
a cement composition comprising a cement, water, and a slag co-grind, wherein the slag co-grind consists of slag and at least one cement component selected from the group consisting of metakaolin, shale, perlite, pozzolan, zeolite, calcium aluminate cement, and combinations thereof ground together, wherein the slag is a by-product from processing of a metal ore;
mixing equipment capable of mixing the cement composition; and
pumping equipment capable of delivering the cement composition into a wellbore.

13. The system of claim 12 , wherein the slag-co grind has a particle size of about 1 nanometer to about 1 micron.

14. The system of claim 12 , wherein the slag co-grind is present in an amount of about 1% to about 99% by weight of cement.

Assignees

• Halliburton Energy Services Inc

Inventors

• Chatterji Jiten
• Brenneis Darrell Chad
• Benkley James Robert
• Hundt Gregory Robert

Classifications

• C04B28/08 Primary

  Slag cements · CPC title

• C04B14/043 Primary

  Alkaline-earth metal silicates, e.g. wollastonite · CPC title

• C04B20/008

  Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder (colloidal silica C04B14/062 ; silica fume C04B18/146) · CPC title

• C09K8/46 Primary

  containing inorganic binders, e.g. Portland cement · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title