Foamers for liquid removal

1. A method of removing a low molecular weight alcohol or alcohol-containing fluid during oil or gas production, comprising:

introducing into a wellbore or a pipeline containing the low molecular weight alcohol or alcohol-containing fluid a composition comprising an effective amount of a compound of formula (I):

wherein:

R is hydrogen or —CH 2 CH 2 —(CF 2 CF 2 ) x —CF 2 CF 3 ;

each x is independently an integer from 1 to 50;

n is 1 or 2;

Cat is a cation selected from the group consisting of betaine, N(R a ) 4 ⊕ , an alkali metal cation and an alkaline earth metal cation, wherein each R a is independently hydrogen or optionally substituted C 1 -C 6 alkyl; and

removing the low molecular weight alcohol or alcohol-containing fluid from the wellbore or the pipeline.

2. The method of claim 1 , wherein the composition further comprises a solvent.

3. The method of claim 2 , wherein the solvent is selected from the group consisting of water, a C 1 -C 6 alcohol, a glycol, a glycol ether and xylenes.

4. The method of claim 1 , wherein the composition further comprises an additive selected from the group consisting of corrosion inhibitors, scale inhibitors, biocides, paraffin dispersants and emulsion breakers.

5. The method of claim 1 , wherein the composition further comprises a surfactant selected from the group consisting of siloxanes, sulfobetaine fluorocarbons, amine oxide fluorocarbons, ethoxylated nonylphenol type fluorocarbons, ethoxylated alcohol type fluorocarbons, fluoropolymers, betaines, amine oxides, ethoxylated nonylphenols, ethoxylated alcohol olefin sulfonates and ether sulfonates.

6. The method of claim 1 , wherein the composition comprises about 10 ppm to about 100,000 ppm of the compound of formula (I).

7. The method of claim 1 , further comprising introducing the composition into the wellbore or pipeline as batch addition.

8. The method of claim 1 , comprising continuously introducing the composition into the wellbore or pipeline.

9. A method of recovering a hydrocarbon fluid from a well, comprising:

introducing into the well containing the hydrocarbon a composition comprising an effective foam-forming amount of a compound of formula (I):

wherein:

R is —CH 2 CH 2 —(CF 2 CF 2 ) x —CF 2 CF 3 ;

each x is independently an integer from 8 to 50;

n is 1 or 2;

Cat is a cation selected from the group consisting of betaine, N(R a ) 4 ⊕ , an alkali metal cation and an alkaline earth metal cation, wherein each R a is independently hydrogen or optionally substituted C 1 -C 6 alkyl; and

removing the hydrocarbon from the well.

10. The method of claim 9 , wherein the hydrocarbon fluid is a naturally present liquid in a gas well.

11. The method of claim 10 , further comprising recovering the gas from the gas well.

12. The method of claim 9 , wherein the hydrocarbon fluid is crude oil and the well is a gas-lifted oil well.

13. A method, comprising:

introducing into a wellbore or a pipeline a composition comprising an effective amount of a compound of formula (I):

wherein:

R is —CH 2 CH 2 —(CF 2 CF 2 ) x —CF 2 CF 3 ;

each x is independently an integer from 8 to 50;

n is 1 or 2;

Cat is a cation selected from the group consisting of betaine, N(R a ) 4 ⊕ , an alkali metal cation and an alkaline earth metal cation, wherein each R a is independently hydrogen or optionally substituted C 1 -C 6 alkyl, wherein at least one R a is optionally substituted C 1 -C 6 alkyl.

14. The method of claim 13 , wherein the composition further comprises a solvent.

15. The method of claim 14 , wherein the solvent is selected from the group consisting of water, a C 1 -C 6 alcohol, a glycol, a glycol ether and xylenes.

16. The method of claim 13 , wherein the composition further comprises an additive selected from the group consisting of corrosion inhibitors, scale inhibitors, biocides, paraffin dispersants and emulsion breakers.

17. The method of claim 13 , wherein the composition further comprises a surfactant selected from the group consisting of siloxanes, sulfobetaine fluorocarbons, amine oxide fluorocarbons, ethoxylated nonylphenol type fluorocarbons, ethoxylated alcohol type fluorocarbons, fluoropolymers, betaines, amine oxides, ethoxylated nonylphenols, ethoxylated alcohol olefin sulfonates and ether sulfonates.

18. The method of claim 13 , wherein the composition comprises about 10 ppm to about 100,000 ppm of the compound of formula (I).

19. The method of claim 13 , further comprising introducing the composition into the wellbore or pipeline as batch addition.

20. The method of claim 13 , wherein the composition comprises a gas hydrate inhibitor.