Cement compositions including volcanic ash

Patent metadata

Field	Value
Publication number	US-12497552-B2
Application number	US-202318480888-A
Country	US
Kind code	B2
Filing date	Oct 4, 2023
Priority date	Oct 4, 2023
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

The present disclosure relates to cement compositions including Portland cement and volcanic ash. An exemplary cement composition includes about 10 wt % to about 85 wt % of Portland cement, and about 10% by weight of cement (BWOC) to about 70% BWOC of volcanic ash.

First claim

The invention claimed is:

1 . A cement composition, comprising:
about 10 wt % to about 45 wt % of Portland cement; about 30% by weight of cement (BWOC) to about 50% BWOC of volcanic ash, wherein the volcanic ash comprises about 75 wt % silicon dioxide (SiO 2 ); and about 25 wt % to about 80 wt % of water;
wherein a weight ratio of water to a total amount of Portland cement and volcanic ash present in the cement composition is about 0.4:1 to about 2:1; and
the cement composition has no free fluid.

2 . The cement composition of claim 1 , wherein the volcanic ash comprises Saudi Arabian volcanic ash.

3 . The cement composition of claim 1 , wherein the Portland cement comprises an American Petroleum Institute (API) Class G cement.

4 . The cement composition of claim 1 , comprising about 30% BWOC to about 45% BWOC of volcanic ash.

5 . The cement composition of claim 1 , comprising about 40% BWOC of volcanic ash.

6 . The cement composition of claim 1 , comprising
about 15 wt % to about 45 wt % of Portland cement; and about 30 wt % to about 65 wt % of water.

7 . The cement composition of claim 1 , further comprising an extender.

8 . The cement composition of claim 7 , comprising about 0.1% BWOC to about 20% BWOC of the extender.

9 . The cement composition of claim 1 , further comprising a defoamer.

10 . The cement composition of claim 9 , comprising about 0.01% BWOC to about 2% BWOC of the defoamer.

11 . The cement composition of claim 1 , further comprising a gelling agent.

12 . The cement composition of claim 11 , comprising about 0.1% BWOC to about 5% BWOC of the gelling agent.

13 . The cement composition of claim 1 , further comprising a retarder.

14 . The cement composition of claim 13 , comprising about 0.01% BWOC to about 3% BWOC of the retarder.

15 . The cement composition of claim 1 , having a density of about 80 pcf to about 120 pcf.

16 . The cement composition of claim 1 , having a density of about 80 pcf to about 105 pcf.

17 . The cement composition of claim 1 , having a thickening time of about 3 hours to about 8 hours at about 120° F. and about 2,700 psi.

18 . The cement composition of claim 1 , having a thickening time of about 4 hours to about 7 hours at about 120° F. and about 2,700 psi.

19 . The cement composition of claim 1 , having a compressive strength of about 50 psi to about 1,500 psi after curing for about 1 day at about 150° F.

20 . The cement composition of claim 1 , having a compressive strength of about 100 psi to about 2,000 psi after curing for about 3 days at about 150° F.

21 . A cement composition, comprising:
about 10 wt % to about 45 wt % of Portland cement; about 30% BWOC to about 50% BWOC of volcanic ash, wherein the volcanic ash comprises about 75 wt % silicon dioxide (SiO 2 ); about 0.01% BWOC to about 2% BWOC of a defoamer; about 0.1% BWOC to about 5% BWOC of a gelling agent; about 0.1% BWOC to about 3% BWOC of a retarder; and about 25 wt % to about 80 wt % of water;
wherein a weight ratio of water to a total amount of Portland cement and volcanic ash present in the cement composition is about 0.4:1 to about 2:1; and
the cement composition has no free fluid.

22 . The cement composition of claim 21 , further comprising about 0.1% BWOC to about 5% BWOC of an extender.

23 . The cement composition of claim 22 , wherein the extender comprises bentonite.

24 . A cement composition, comprising:
about 10 wt % to about 45 wt % of Portland cement; about 30% BWOC to about 50% BWOC of volcanic ash, wherein the volcanic ash comprises about 75 wt % silicon dioxide (SiO 2 ); about 5% BWOC to about 20% BWOC of an extender; about 0.01% BWOC to about 2% BWOC of a defoamer; about 25 wt % to about 80 wt % of water;
wherein a weight ratio of water to a total amount of Portland cement and volcanic ash present in the cement composition is about 0.4:1 to about 2:1; and
the cement composition has no free fluid.

25 . The cement composition of claim 24 , wherein the extender comprises sodium silicate.

26 . A method of cementing a wellbore, comprising
providing the cement composition of claim 1 to the wellbore, and curing the cement composition.

27 . The method of claim 26 , comprising pumping the cement composition into an annulus between the wellbore and a casing in the wellbore.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alyami Noktan Mohammed
• Al-Safran Ali
• Wagle Vikrant
• Al-Yami Abdullah Saleh Hussain
• Heinold Thomas
• Alanqari Khawlah

Classifications

• E21B33/14

  for cementing casings into boreholes · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• C04B2201/20

  for the density · CPC title

• C04B2103/50

  Defoamers, air detrainers · CPC title

• C04B2103/46

  Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents · CPC title