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1. (WO2015171159) CENDRES DE CANNE À SUCRE DANS DES FLUIDES TAMPONS
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

What is claimed is:

1. A method comprising:

using a spacer fluid comprising sugar cane ash and water to displace a drilling fluid in a wellbore.

2. A method according to claim 1 wherein the drilling fluid comprises an oil-based drilling fluid.

3. A method according to any preceding claim wherein the sugar cane ash is present in an amount of about 0.1% to about 80% by weight of the spacer fluid.

4. A method according to any preceding claim wherein the sugar cane ash is present in an amount of about 40% to about 70% by weight of the spacer fluid.

5. A method according to any preceding claim wherein the spacer fluid further comprises hydrated lime.

6. A method according to any preceding claim wherein the spacer fluid further comprises a cement set activator.

7. A method according to claim 6 wherein the cement set activator comprises calcium chloride.

8. A method according to any preceding claim wherein the spacer fluid further comprises at least one additive selected from the group consisting of cement kiln dust, lime kiln dust, pumice, and any combination thereof.

9. A method according to any preceding claim wherein the spacer fluid comprises at least one additive selected from the group consisting of a free water control additive, a lightweight additive, a foaming agent, a supplementary cementitious material, a weighting agent of any suitable size, a viscosifying agent, a fluid loss control agent, a lost circulation material, a filtration control additive, a dispersant, a defoamer, a corrosion inhibitor, a scale inhibitor, a formation conditioning agent, a water-wetting surfactant, and any combination thereof.

10. A method according to any preceding claim wherein the spacer fluid comprises at least one additive selected from the group consisting of gypsum, fly ash, bentonite, hydroxyethyl cellulose,

sodium silicate, a hollow microsphere, gilsonite, perlite, a gas, an organic polymer, a biopolymer, latex, ground rubber, a surfactant, crystalline silica, amorphous silica, silica flour, fumed silica, nano-clay, salt, fiber, hydratable clay, rice husk ash, micro-fine cement, metakaolin, zeolite, shale, pumicite, Portland cement, Portland cement interground with pumice, barite, slag, lime, and any combination thereof.

1 1. A method according to any preceding claim further comprising pumping the spacer fluid down an interior of a pipe string, out through a bottom of the pipe string, and into a wellbore annulus.

12. A method according to any preceding claim further comprising introducing a cement composition into the wellbore after the spacer fluid, wherein the spacer fluid separates the cement composition from the drilling fluid.

13. A method according to any preceding claim further comprising allowing at least a portion of the spacer fluid to remain in the wellbore.

14. A method according to claim 13 wherein the portion of the spacer fluid consolidates in the wellbore.

15. A method comprising:

using a spacer fluid comprising sugar cane ash, hydrated lime, and water to displace an aqueous drilling fluid in a wellbore annulus; and

introducing a cement composition into the wellbore annulus after the spacer fluid, wherein at least a portion of the spacer fluid consolidates in the wellbore annulus to form a hardened mass.

16. A method according to claim 1 5 wherein the spacer fluid further comprises a cement set activator.

17. A method according to claim 16 wherein the cement set activator comprises calcium chloride.

18. A system comprising:

a cement composition for use in cementing in a wellbore;

a spacer fluid for separating the cement composition from a drilling fluid in the wellbore, wherein the spacer fluid comprises sugar cane ash and water;

mixing equipment for mixing the spacer fluid; and

pumping equipment for delivering the spacer fluid into a wellbore.

19. A system according to claim 18 wherein the spacer fluid further comprises at least one additive selected from the group consisting of cement kiln dust, lime kiln dust, pumice, and any combination thereof.

20. A system according to claim 18 or claim 19 wherein the spacer fluid further comprises a cement set activator.

21. A spacer fluid composition comprising:

sugar cane ash and

water.

22. A composition according to claim 21 wherein the sugar cane ash is present in an amount of about 0.1 % to about 80% by weight of the spacer fluid.

23. A composition according to claim 21 or 22 wherein the spacer fluid further comprises a cement set activator.