Fly ash-cement for oil and gas cementing applications

Patent metadata

Field	Value
Publication number	US-11084758-B1
Application number	US-202016892665-A
Country	US
Kind code	B1
Filing date	Jun 4, 2020
Priority date	Jun 4, 2020
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A cementing composition may include a sulfate-resistant cement and fly ash. The sulfate-resistant cement may contain calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz. The composition may contain the fly ash in an amount in the range of 10 to 40 wt. %. The sulfate-resistant cement may contain the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

First claim

What is claimed is:

1. A cementing composition, comprising:
a sulfate-resistant cement that comprises:
calcium magnesium aluminum oxide silicate;
brownmillerite;
dolomite;
periclase; and
quartz; and

fly ash,
wherein the composition contains the fly ash in an amount in the range of 10 to 40 wt. %.

2. The composition according to claim 1 , wherein the sulfate-resistant cement contains the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

3. The composition according to claim 1 , wherein the sulfate-resistant cement contains the brownmillerite in an amount of the range of 15 to 25 wt. %.

4. The composition according to claim 1 , wherein the sulfate-resistant cement contains the dolomite in an amount of the range of 5 to 15 wt. %.

5. The composition according to claim 1 , wherein the sulfate-resistant cement contains the periclase in an amount of the range of 5 to 15 wt. %.

6. The composition according to claim 1 , wherein the sulfate-resistant cement contains calcium aluminum oxide in an amount of 3 wt. % or less.

7. A cementing slurry, comprising:
a cement composition that comprises a sulfate-resistant cement and fly ash; and
water;
wherein the cement composition contains the fly ash in an amount in the range of 10 to 40 wt. %, and
wherein the sulfate-resistant cement comprises calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz.

8. The cementing slurry according to claim 7 , wherein the cement slurry contains the cement composition in an amount in the range of about 40 to 90 wt. %.

9. The cementing slurry according to claim 7 , wherein the cementing slurry contains one or more additives selected from the group consisting of expansion additives, weighting agents, dispersants, and fluid loss additives.

10. The cementing slurry according to claim 7 , wherein the sulfate-resistant cement contains the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

11. The cementing slurry according to claim 7 , wherein the sulfate-resistant cement contains the brownmillerite in an amount of the range of 15 to 25 wt. %.

12. The cementing slurry according to claim 7 , wherein the sulfate-resistant cement contains the dolomite in an amount of the range of 5 to 15 wt. %.

13. The cementing slurry according to claim 7 , wherein the sulfate-resistant cement contains the periclase in an amount of the range of 5 to 15 wt. %.

14. The cementing slurry according to claim 7 , wherein the sulfate-resistant cement contains calcium aluminum oxide in an amount of 3 wt. % or less.

15. A method of cementing a wellbore, comprising:
forming a cementing slurry by mixing water with a cement composition that comprises a sulfate-resistant cement and fly ash;
pumping the cementing slurry to a selected location within the wellbore; and
curing the cementing slurry at the selected location to give a concrete structure,
wherein the cement composition contains the fly ash in an amount in the range of 10 to 40 wt. %, and
wherein the sulfate-resistant cement comprises calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz.

16. The method according to claim 15 , wherein the concrete structure has a compressive strength of 1500 psi or more.

17. The method according to claim 15 , wherein the forming the cementing slurry further comprises mixing one or more additives selected from the group consisting of expansion additives, weighting agents, dispersants, and fluid loss additives with the sulfate-resistant cement and the fly ash.

18. The method according to claim 15 , wherein the sulfate-resistant cement contains the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

19. The method according to claim 15 , wherein the sulfate-resistant cement contains the brownmillerite in an amount of the range of 15 to 25 wt. %.

20. The method according to claim 15 , wherein the sulfate-resistant cement contains the dolomite in an amount of the range of 5 to 15 wt. %.

21. The method according to claim 15 , wherein the sulfate-resistant cement contains the periclase in an amount of the range of 5 to 15 wt. %.

22. The method according to claim 15 , wherein the sulfate-resistant cement contains calcium aluminum oxide in an amount of 3 wt. % or less.

23. A method of preparing a cementing composition, comprising:
mixing calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz to give a sulfate-resistant cement; and
mixing the sulfate resistant cement with fly ash,
wherein the composition contains the fly ash in an amount in the range of 10 to 40 wt. %.

24. The method according to claim 23 , wherein the sulfate-resistant cement contains the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

25. The method according to claim 23 , wherein the sulfate-resistant cement contains the brownmillerite in an amount of the range of 15 to 25 wt. %.

26. The method according to claim 23 , wherein the sulfate-resistant cement contains the dolomite in an amount of the range of 5 to 15 wt. %.

27. The method according to claim 23 , wherein the sulfate-resistant cement contains the periclase in an amount of the range of 5 to 15 wt. %.

28. The method according to claim 23 , wherein the sulfate-resistant cement contains calcium aluminum oxide in an amount of 3 wt. % or less.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alanqari Khawlah A
• Al-Yami Abdullah
• Al-Safran Ali
• Wagle Vikrant

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B2111/2015

  Sulfate resistance · CPC title

• C09K8/46 Primary

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

• C04B28/021 Primary

  Ash cements, e.g. fly ash cements (fly ash as filler C04B18/08); Cements based on incineration residues, e.g. alkali-activated slags from waste incineration (alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18); Kiln dust cements · CPC title

• C04B28/188

  the Ca-silicates being present in the starting mixture · CPC title