Cements for oil and gas cementing applications

Patent metadata

Field	Value
Publication number	US-2021403792-A1
Application number	US-202016914120-A
Country	US
Kind code	A1
Filing date	Jun 26, 2020
Priority date	Jun 26, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

A sulfate-resistant cement composition may contain calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and calcium aluminum oxide. The composition may contain the calcium aluminum oxide in an amount in the range of 0.01 to 2.0 wt. %. The composition may contain the brownmillerite in an amount of the range of 20 to 30 wt. %.

First claim

What is claimed is:

1 . A sulfate-resistant cement composition, comprising:
calcium magnesium aluminum oxide silicate; brownmillerite; dolomite; periclase; and calcium aluminum oxide, wherein the composition contains the calcium aluminum oxide in an amount of the range of 0.01 to 2.0 wt. %.

2 . The composition according to claim 1 , wherein the composition contains the brownmillerite in an amount of the range of 20 to 30 wt. %.

3 . The composition according to claim 1 , wherein the composition contains the dolomite in an amount of the range of 5 to 15 wt. %.

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

5 . The composition according to claim 1 , wherein the composition is free of quartz.

6 . A cementing slurry, comprising:
a cement composition that comprises calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase; and calcium aluminum oxide; and water; wherein the cement composition contains the calcium aluminum oxide in an amount in the range of 0.01 to 2.0 wt. %.

7 . The cementing slurry according to claim 6 , wherein the cement slurry contains the cement composition in an amount in the range of about 40 to 90 wt. %

8 . The cementing slurry according to claim 6 , wherein the cementing slurry contains one or more additives selected from the group consisting of expansion additives, weighting agents, dispersants, and fluid loss additives.

9 . The cementing slurry according to claim 6 , wherein the cement composition contains the brownmillerite in an amount of the range of 20 to 30 wt. %.

10 . The cementing slurry according to claim 6 , wherein the cement composition contains the dolomite in an amount of the range of 5 to 15 wt. %.

11 . The cementing slurry according to claim 6 , wherein the cement composition contains the periclase in an amount of the range of 5 to 15 wt. %.

12 . The cementing slurry according to claim 6 , wherein the cement composition is free of quartz.

13 . A method of cementing a wellbore, comprising:
forming a cementing slurry by mixing water with a cement composition that comprises calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase; and calcium aluminum oxide; 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 calcium aluminum oxide in an amount in the range of 0.01 to 2.0 wt. %.

14 . The method according to claim 13 , wherein the concrete structure has a compressive strength of 3000 psi or more.

15 . The method according to claim 13 , wherein the cement composition contains the brownmillerite in an amount of the range of 20 to 30 wt. %.

16 . The method according to claim 13 , wherein the cement composition contains the dolomite in an amount of the range of 5 to 15 wt. %.

17 . The method according to claim 13 , wherein the cement composition contains the periclase in an amount of the range of 5 to 15 wt. %.

18 . The method according to claim 13 , wherein the cement composition is free of quartz.

19 . The method according to claim 13 , wherein the cement slurry contains the cement composition in an amount in the range of about 40 to 90 wt. %

20 . The method according to claim 13 , wherein the cement slurry contains one or more additives selected from the group consisting of expansion additives, weighting agents, dispersants, and fluid loss additives.

Assignees

• Saudi Arabian Oil Co

Inventors

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

Classifications

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title

• C04B28/188

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

• C04B14/308

  Iron oxide · CPC title