Calcium phosphate cement compositions comprising pumice and/or perlite and associated methods

Patent metadata

Field	Value
Publication number	US-9499731-B2
Application number	US-201414584281-A
Country	US
Kind code	B2
Filing date	Dec 29, 2014
Priority date	Nov 21, 2011
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

Methods and compositions are provided that related to cementing operations. Methods and compositions that include pumice and/or perlite as a replacement for fly ash.

First claim

What is claimed is:

1. A well cement composition comprising:
calcium aluminate;
sodium polyphosphate in an amount of about 2% to about 20% by weight of the cement composition;
an additive comprising pumice, wherein the additive has a mean particle size of less than about 15 microns; and
water in an amount sufficient to form a pumpable slurry;
wherein the additive is present in an amount that will increase a compressive strength of the well cement composition by at least 20% compared to the well cement composition comprising a comparable amount of fly ash instead of the additive.

2. The composition of claim 1 wherein the calcium aluminate is present in an amount of about 15% to about 60% by weight of the well cement composition.

3. The composition of claim 1 wherein the sodium polyphosphate comprises a polyphosphate selected from the group consisting of sodium hexametaphosphate, sodium triphosphate, a vitreous sodium phosphate, and any combination thereof.

4. The composition of claim 1 wherein the sodium polyphosphate is present in an amount of about 5% to about 20% by weight of the well cement composition.

5. The composition of claim 1 further comprising calcium alumino silicate.

6. The composition of claim 5 wherein the pumice has a mean particle size of about 0.01 microns to about 20 microns.

7. The composition of claim 5 wherein the pumice is present in an amount of about 15% to about 60% by weight of the well cement composition.

8. The composition of claim 1 wherein the well cement composition further comprises a second additive selected from the group consisting of an expansive additive, a set retarder, a foaming agent, a foam stabilizer, a set accelerator, a surfactant, a fluid loss control additive, a weighting agent, a lightweight additive, a dispersant, an elastic particle, a gas-generating additive, a lost circulation material, a defoaming additive, an extending additive, and any combination thereof.

9. The method of claim 1 wherein the well cement composition is essentially free of fly ash.

10. The composition of claim 1 wherein the well cement composition has a thickening time from 3 hours to about 12 hours and 47 minutes.

11. A well cement composition comprising:
calcium aluminate in an amount of about 15% to about 60% by weight of the cement composition;
sodium polyphosphate in an amount of about 2% to about 20% by weight of the cement composition;
pumice in an amount of about 15% to about 60% by weight of the cement composition, wherein the pumice has a mean particle size of less than about 15 microns;
a cement set retarder; and
water in an amount sufficient to form a pumpable slurry;
wherein the pumice is present in an amount that will increase a compressive strength of the well cement composition by at least 20% compared to the well cement composition comprising a comparable amount of fly ash instead of the pumice.

12. The composition of claim 11 wherein the calcium aluminate is present in an amount of about 15% to about 45% by weight of the well cement composition, wherein the sodium polyphosphate is present in an amount of about 2% to about 10% by weight of the well cement composition, wherein the pumice is present in an amount of about 15% to about 45% by weight of the well cement composition, and wherein the cement composition is essentially free of fly ash.

13. The composition of claim 11 wherein the sodium polyphosphate comprises a polyphosphate selected from the group consisting of sodium hexametaphosphate, sodium triphosphate, a vitreous sodium phosphate, and any combination thereof.

14. The composition of claim 11 wherein the cement set retarder is present in an amount up to about 2% by weight of the well cement composition.

15. The composition of claim 11 wherein the well cement composition further comprises an additive selected from the group consisting of an expansive additive, a set retarder, a foaming agent, a foam stabilizer, a set accelerator, a surfactant, a fluid loss control additive, a weighting agent, a lightweight additive, a dispersant, an elastic particle, a gas-generating additive, a lost circulation material, a defoaming additive, an extending additive, and any combination thereof.

16. The composition of claim 11 wherein the well cement composition has a thickening time from 3 hours to about 12 hours and 47 minutes.

Assignees

• Halliburton Energy Services Inc

Inventors

• Karcher Jeffery D
• Brenneis D Chad
• Brothers Lance E

Classifications

• C04B7/32

  Aluminous cements · CPC title

• C04B14/16

  porous, e.g. pumice · CPC title

• C04B2103/0088

  Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes · CPC title

• C04B28/06

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

• C09K8/46 Primary

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