High density cement formulation to prevent gas migration problems

Patent metadata

Field	Value
Publication number	US-9273242-B2
Application number	US-201414480874-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Sep 9, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

The invention provides a high density cement composition for preventing gas migration. The composition includes a silica sand component, a silica flour component, a hematite component, a manganese tetraoxide component, and an expansion additive component.

First claim

That which is claimed is:

1. A cement composition for preventing gas migration and fluid loss consisting essentially of:
silica sand in an amount of 10% by weight of cement;
silica flour in an amount of 25% by weight of cement;
hematite in an amount of 45% by weight of cement;
manganese tetraoxide in an amount of 45% by weight of cement;
calcined magnesium oxide in an amount of 5% by weight of cement;
ethylene glycol in an amount of 1.2% by weight of cement;
calcium lignosulfate in an amount of 0.45% by weight of cement; and
acrylamide copolymer in an amount of 0.3% by weight of cement.

2. The cement composition of claim 1 , wherein the silica sand component has an average particle size in a range of from 100 microns to 200 microns.

3. The cement composition of claim 1 , wherein the silica sand component has an average particle size of 100 microns.

4. The cement composition of claim 1 , wherein the composition has a density of 170 pounds per cubic foot (pcf).

5. The cement composition of claim 1 , wherein the composition has a density of at least 170 pcf.

6. The cement composition of claim 1 , wherein the composition has a density in a range of from 130 pcf to 180 pcf.

7. The cement composition of claim 1 , wherein the silica flour component has an average particle size of 15 microns.

8. The cement composition of claim 1 , wherein the hematite component has a specific gravity of 4.95.

9. The cement composition of claim 1 , wherein the hematite component has a mean particle size distribution of 45 microns.

10. The cement composition of claim 1 , wherein the manganese tetraoxide component has an average particle size of 5 microns.

11. A cement composition for preventing gas migration consisting essentially of:
silica sand in an amount of 25% by weight of cement;
silica flour in an amount of 10% by weight of cement;
hematite in an amount of 45% by weight of cement;
manganese tetraoxide in an amount of 45% by weight of cement;
calcined magnesium oxide in an amount of 5% by weight of cement;
ethylene glycol in an amount of 1.2% by weight of cement;
calcium lignosulfate in an amount of 0.45% by weight of cement; and
acrylamide copolymer in an amount of 0.3% by weight of cement.

12. The cement composition of claim 11 , wherein the silica sand component has an average particle size in a range of from 100 microns to 200 microns.

13. The cement composition of claim 11 , wherein the composition has a density in a range of from 130 pcf to 180 pcf.

14. The cement composition of claim 11 , wherein the silica flour component has an average particle size of 15 microns.

15. The cement composition of claim 11 , wherein the hematite component has a specific gravity of 4.95.

16. The cement composition of claim 11 , wherein the hematite component has a mean particle size distribution of 45 microns.

17. The cement composition of claim 11 , wherein the manganese tetraoxide component has an average particle size of 5 microns.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah Saleh
• Al-Humaidi Ahmad Saleh

Classifications

• C09K8/48

  Density increasing or weighting additives · CPC title

• C09K8/493 Primary

  Additives for reducing or preventing gas migration · CPC title

• C04B14/04

  Silica-rich materials; Silicates · CPC title

• C04B22/06

  Oxides, Hydroxides (C04B22/0013 takes precedence) · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title