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1. WO2020112602 - LAITIERS DE CIMENT, CIMENT DURCI, LEURS PROCÉDÉS DE PRÉPARATION ET D'UTILISATION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A cement slurry comprising:

water;

a cement precursor material;

acrylic acid copolymer;

zinc oxide; and

a phosphonic acid-based thickener.

2. The cement slurry of claim 1, in which the phosphonic acid-based thickener comprises at least one of diethylenetriamine pentamethylphosphonic acid (DTPMP) or nitrilotris(methylene) triphosphonic acid (NTMP).

3. The cement slurry of claim 2, in which the cement slurry has a thickening time at 400°F of greater than 4 hours and less than 65 hours.

4. The cement slurry of any of claims 2 or 3, in which the cement slurry comprises from 0.4 to 2 wt.% by weight of cement precursor (BWOC) DTPMP.

5. The cement slurry of any previous claim, in which the cement slurry comprises from 0.4 to 2 wt.% BWOC acrylic acid copolymer.

6. The cement slurry of any previous claim, in which the cement slurry comprises from 0.1 to 1 wt.% BWOC zinc oxide.

7. The cement slurry of any previous claim, in which the acrylic acid copolymer comprises 2-acrylamido-2-methylpropane sulfonic acid.

8. The cement slurry of any previous claim, in which the cement precursor material is a hydraulic cement precursor and comprises one or more components selected from the group consisting of calcium hydroxide, silicates, belite (Ca2SiOs), alite (Ca3Si04), tricalcium aluminate (Ca3Ak06), tetracalcium aluminoferrite (Ca4Al2Fe20io), brownmilleriate (4Ca0-Ak03-Fe203),

gypsum (CaSO^ThO) sodium oxide, potassium oxide, limestone, lime (calcium oxide), hexavalent chromium, calcium aluminate, quartz, and combinations thereof.

9. The cement slurry of any previous claim, in which the cement precursor material comprises Portland cement precursor, siliceous fly ash, calcareous fly ash, slag cement, silica fume, quartz, or combinations thereof.

10. The cement slurry of any previous claim, in which the cement precursor material comprises Saudi cement precursor and silica flour.

11. A method of cementing a wellbore, comprising:

pumping a cement slurry comprising water, a cement precursor material, acrylic acid copolymer, zinc oxide, and a phosphonic acid-based thickener into a location to be cemented; and

curing the cement slurry by allowing the water and the cement precursor material to react.

12. The method of claim 11, in which the phosphonic acid-based thickener comprises at least one of diethylenetriamine pentamethylphosphonic acid (DTPMP) or nitrilotris(methylene) triphosphonic acid (NTMP).

13. The method of any of claims 11 or 12, in which the cement slurry has a thickening time at 400°F of greater than 4 hours and less than 60 hours.

14. The method of any of claims 11 to 13, in which the cement slurry comprises:

from 0.4 to 2 wt.% by weight of cement precursor (BWOC) DTPMP;

from 0.4 to 2 wt.% BWOC acrylic acid copolymer; and

from 0.1 to 1 wt.% BWOC zinc oxide.

15. The method of any of claims 11 to 14, in which the acrylic acid copolymer comprises 2-acrylamido-2-methylpropane sulfonic acid.