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1. WO2020159549 - ESPACEURS COMPATIBLES À FAIBLE TENEUR EN SILICE CRISTALLINE

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

[ EN ]

What is claimed is:

1. A method for displacing wellbore fluids, comprising:

providing a spacer fluid comprising water and a spacer additive, wherein the spacer additive comprises a solid scouring material and a biopolymer gum, wherein the solid scouring material comprises crystalline silica in an amount of about 5 wt. % or less, and wherein the spacer fluid is essentially free of clay; and

introducing the spacer fluid into a wellbore to displace at least a portion of a first fluid in the wellbore.

2. The method of claim 1, further comprising combining at least a spacer dry blend and water to form the spacer fluid, wherein the spacer dry blend comprises the solid scouring material and the biopolymer.

3. The method of claim 1, wherein the solid scouring material has a specific gravity of less than 2.5, and wherein the spacer fluid is free of crystalline silica or comprises crystalline silica in an amount of about 1 wt. % or less, not including any components having a specific gravity greater than 2.5.

4. The method of claim 1, wherein the solid scouring material has a Mohs hardness of about 6 or greater, wherein the solid scouring material has a roundness of about 0.6 or less, and wherein the solid scouring material has a sphericity of about 6 or less.

5. The method of claim 1, wherein the solid scouring material comprises at least one material selected from the group consisting of pumice, perlite, other volcanic glasses, fumed silica, fly ash, and combinations thereof, and wherein the biopolymer gum comprises at least one gum selected from the group consisting of xanthan gum, diutan gum, welan gum, scleroglucan gum, and combinations thereof.

6. The method of claim 1, wherein the solid scouring material comprises pumice, and wherein the biopolymer gum comprises diutan gum.

7. The method of claim 1, wherein a weight ratio of the biopolymer gum to the solid scouring material in the spacer additive is about 10:90 to about 1 :99.

8. The method of claim 1, wherein a weight ratio of the biopolymer gum to the solid scouring material in the spacer additive is about 3 :97 to about 2:98.

9. The method of claim 1, wherein the spacer fluid further comprises a solid surfactant composite.

10. The method of claim 9, wherein the solid surfactant composite has a mean particle size of about 5 microns to about 1,500 microns, and wherein the solid surfactant composite comprises a wetting surfactant on a solid carrier.

11. The method of claim 1, wherein the spacer fluid further comprises at least one additive selected from the group consisting of a defoaming agent, a weighting agent, and combinations thereof.

12. The method of claim 1, wherein the first fluid comprises an oil-based drilling fluid.

13. The method of claim 1, further comprising introducing a cement composition into the wellbore behind the spacer fluid.

14. A method for displacing wellbore fluids, comprising:

providing a spacer dry blend comprising a spacer additive, a solid surfactant composite, and a weighting agent having a specific gravity greater than 2.5, wherein the spacer additive comprises pumice and diutan gum in a diutan gum to pumice weight ratio of about 2:98 to about 3 :97, and wherein the solid surfactant composite comprises a surfactant on a solid carrier;

combining at least the spacer dry blend and water to form a spacer fluid, wherein the spacer fluid is essentially free of clay comprising montmorrillonite clay, attapulgite clay, and sepiolite clay; and

introducing the spacer fluid into a wellbore to displace at least a portion of an oil-based drilling fluid in the wellbore.

15. The method of claim 14, further comprising introducing a cement composition into the wellbore behind the spacer fluid.

16. A spacer fluid for use in displacing wellbore fluids, comprising:

water; and

a spacer additive comprising a solid scouring material and a biopolymer gum, wherein the solid scouring material comprises crystalline silica in an amount of about 2.5 wt. % or less,

wherein the spacer fluid is essentially free of clay.

17. The spacer fluid of claim 16, wherein the solid scouring material has a specific gravity of less than 2.5, and wherein the spacer fluid is free of crystalline silica or comprises crystalline silica in an amount of about 1 wt. % or less, not including any components having a specific gravity greater than 2.5.

18. The spacer fluid of claim 16, wherein the solid scouring material has a Mohs hardness of about 6 or greater, wherein the solid scouring material has a roundness of about 0.6 or less, and wherein the solid scouring material has a sphericity of about 6 or less.

19. The spacer fluid of claim 16, wherein the solid scouring material comprises pumice, and wherein the biopolymer gum comprises diutan gum.

20. The spacer fluid of claim 16, wherein the spacer fluid further comprises a solid surfactant composite, wherein the solid surfactant composite comprises a wetting surfactant on a solid carrier.