Granted Patent B2

US 8,022,017 · App. 12/643,521 · Granted Sep 20, 2011

Abstract

Claims (28)

1. A method of inhibiting corrosion from iron and ferrous base materials during the treatment of a subterranean formation which comprises introducing into a gas or oil well a corrosive inhibiting effective amount of a dithiazine of the formula:

wherein R is selected from the group consisting of a C 1 to C 10 saturated or unsaturated hydrocarbyl group or a C 1 to C 10 ω-hydroxy saturated or unsaturated hydrocarbyl group

for a time sufficient to inhibit corrosion of the iron and ferrous base materials.

2. The method of claim 1 , which further comprises introducing into the well, with the dithiazine of formula (I) at least one component selected from the group consisting of:

(a) an alkyl, hydroxyalkyl, alkylaryl or arylamine quaternary salt;

(b) a mono or polycyclic aromatic amine salt;

(c) an imidazoline derivative;

(d) a mono-, di- or trialkyl or alkylaryl phosphate ester; and

(e) a monomeric or oligomeric fatty acid.

3. The method of claim 2 , wherein the at least one component is an alkyl, hydroxyalkyl, alkylaryl or arylamine quaternary salt.

4. The method of claim 3 , wherein the quaternary salt of the at least one component is of the formula [N + R 1 R 2 R 3 R 4 ][X − ] wherein each of R 1 , R 2 , R 3 and R 4 contains 1 to 18 carbon atoms and X is Cl, Br or I.

5. The method of claim 4 , wherein at least one of R 1 , R 2 , R 3 and R 4 is a C 1 -C 6 alkyl group or a hydroxyalkyl group wherein the alkyl group is a C 1 -C 6 alkyl or an alkyl aryl.

6. The method of claim 2 , wherein the at least one component is a mono or polycyclic aromatic amine salt with an alkyl or alkylaryl halide.

7. The method of claim 6 , wherein the salt is of the formula [N + R 1 R 2 R 3 R 4 ][X] wherein R 1 , R 2 , R 3 and R 4 independently contain from 1 to about 18 carbon atoms and X is Cl, Br or I.

8. The method of claim 7 , wherein R 1 , R 2 , R 3 and R 4 are independently selected from a C 1 -C 6 alkyl group or a C 1 -C 6 hydroxyalkyl group or an alkyl aryl group wherein the alkyl group is a C 1 -C 6 alkyl.

9. The method of claim 2 , wherein the at least one component is introduced to dithiazine isolated from a spent fluid, the spent fluid having been formed by reaction of hydrogen sulfide and a triazine of the formula:

10. The method of claim 2 , wherein the at least one component is introduced to a whole spent fluid containing dithiazine.

11. The method of claim 2 , wherein the at least one component is selected from the group consisting of alkylamine benzyl quaternary ammonium salts, benzyl triethanolamine quaternary ammonium salts and benzyl dimethylaminoethanolamine quaternary ammonium salts.

12. The method of claim 2 , wherein the at least one component is a quaternary ammonium or alkyl pyridinium quaternary salt of the formula:

wherein R 1 is an alkyl group or an aryl group having from 1 to about 18 carbon atoms and B is chloride, bromide or iodide.

13. The method of claim 1 , wherein R is —R 1 —OH, where R 1 is an alkylene group.

14. The method of claim 13 , wherein R 1 is a C 1 -C 6 —OH group.

15. The method of claim 14 , wherein R 1 is —CH 2 CH 2 —OH.

16. The method of claim 1 , wherein the dithiazine is a component of a spent fluid, the spent fluid having been formed by reaction of hydrogen sulfide and a triazine of the formula:

17. The method of claim 16 , wherein each R of formula (II) is —CH 2 CH 2 —OH.

18. The method of claim 1 , wherein the dithiazine is isolated from a spent fluid formed by reaction of hydrogen sulfide and a triazine of the formula:

19. The method of claim 1 , wherein the dithiazine is introduced into the well during stimulation.

20. The method of claim 1 , whereby the corrosive effect of an acid solution on metal contacted by an aqueous acid solution is minimized by the addition of the dithiazine to the well.

Assignments (6)