The present invention relates to cementing operations and, more particularly, to enable compositions comprising water and cement kiln dust "CKD", and associated methods of use.

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We claim:
1. A method of cementing comprising:
providing a settable composition comprising:
water;
cement kiln dust present in the settable composition in an amount of at least 5%
by weight of dry components in the settable composition; and
an additive comprising at least one material selected from the group consisting of:
shale present in the settable composition in an amount in the range of from 5% to
75% by weight of dry components in the settable composition;
zeolite present in the settable composition in an amount in the range of from 5%
to 65% by weight of dry components in the settable composition;
metakaolin present in the settable composition in an amount in the range of from
10% to 50% by weight of dry components in the settable composition; and
combinations thereof;
introducing the settable composition into a wellbore; and
allowing the settable composition to set to form a hardened mass therein.
2. The method as claimed in claim 1, wherein the water comprises at least
one of the following group: freshwater; saltwater; a brine; seawater; and
combinations thereof.
3. The method as claimed in claim 1, wherein the settable composition
further comprises fly ash.
4. The method as claimed in claim 1, wherein the settable composition
further comprises a hydraulic cement.
5. The method as claimed in claim 4, wherein the hydraulic cement is present
in the settable composition in an amount in the range of from 5% to 90%
by weight of dry components in the settable composition.
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6. The method as claimed in claim 1, wherein the shale comprises vitrified
shale.
7. The method as claimed in claim 1, wherein the zeolite comprises chabazite
and clinoptilolite.
8. The method as claimed in claim 1, wherein the settable composition
further comprises slag cement in an amoimt in the range of from 5% to
75% by weight of dry components in the settable composition.
9. The method as claimed in claim 8, wherein the slag cement comprises slag
and a base.
10. The method as claimed in any one of claims 1 to 5, wherein the settable
composition is foamed and fiirther comprises a gas, and a surfactant.
11. The method as claimed in claim 10, wherein the surfactant comprises a
foaming and stabilizing surfactant composition.
12. The method as claimed in claim 1, wherein the settable composition
fiirther comprises at least one of the following group: a set retarding
additive; an accelerator; a lost circulation material; a filtration control
additive; a dispersant; and combinations thereof.
13. The method as claimed in claim 10, wherein the gas comprises at least one
of the following group: air; nitrogen; and combinations thereof
14. The method as claimed in claim 10, when dependent upon claim 3,
wherein the fly ash is present in the foamed settable composition in an
amount in the range of from 5% to 75% by weight of dry components in
the settable composition.
15. The method as claimed in claim 10, wherein the foamed settable
composition further comprises a source of calcium ions.
16. The method as claimed in claim 15, wherein the source of calcium ions is
a lime.
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17. The method as claimed in claim 16, wherein the lime is hydrated lime.
18. The method as claimed in claim 11, wherein the foaming and stabilizing
surfactant composition comprises at least one of the following group: a
mixture of an ammonium salt of an alkyl ether sulfate, a cocoamidopropyl
betaine surfactant, a cocoamidopropyl dimethylamine oxide surfactant,
sodium chloride, and water; a mixture of an ammonium salt of an alkyl
ether sulfate surfactant, a cocoamidopropyl hydroxysultaine surfactant, a
cocoamidopropyl dimethylamine oxide surfactant, sodium chloride, and
water; a hydrolyzed keratin; a mixture of an ethoxylated alcohol ether
sulfate surfactant, an alkyl or alkene amidopropyl betaine surfactant, and
an alkyl or alkene dimethylamine oxide surfactant; an aqueous solution of
an alpha-olefmic sulfonate surfactant and a betaine surfactant; and
combinations thereof
19. The method as claimed in claim 11, wherein the foaming and stabilizing
surfactant composition comprises a mixture an ammonium salt of an alkyl
ether sulfate, a cocoamidopropyl betaine surfactant, a cocoamidopropyl
dimethylamine oxide surfactant, sodium chloride, and water.
20. The method as claimed in claim 10,
wherein the cement kiln dust is present in the foamed settable composition
in an amount in the range of from 5% to 50% by weight of dry components in
the settable composition;
wherein the foamed settable composition fiirther comprises Portland
cement in an amount in the range of from 20% to 90% by weight dry
components in the settable composition;
wherein the surfactant comprises a mixture an ammonium salt of an alkyl
ether sulfate, a cocoamidopropyl betaine surfactant, a cocoamidopropyl
dimethylamine oxide surfactant, sodium chloride, and water; and
wherein the surfactant is present in the foamed settable composition in an
amount in the range of from 0.8% to 5% by volume of the water present in the
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foamed settable composition.
21. The method as claimed in claim 1, wherein the settable composition is
foamed and further comprises a gas, and a surfactant, further comprising:
foaming the settable composition with the gas to form the foamed settable
composition.
Dated this 07*" day of March, 2008 OdujUW*^^^
AISHWXRYAX
IN/PA-1685
OF K «& S PARTNERS
AGENT FOR THE APPLICANT