Quaternized dithiazines and method of using same in treatment of wells
View Patent ↗Corrosion of metallic tubulars in an oil, gas or geothermal well may be inhibited by introducing into the well a dithiazine or dithiazine of the formula: wherein R is selected from the group consisting of a C 1 to C 12 saturated or unsaturated hydrocarbyl group or a C 1 to C 10 ω-hydroxy saturated or unsaturated hydrocarbyl group; R 1 is selected from the group consisting of a C 1 -C 24 straight chain or branched alkyl group or a C 1 -C 24 arylalkyl; R 2 is selected from the group consisting of X-R 4 -X, R 4 being a C 1 -C 6 alkyl group; and X is chlorine, bromine or iodine. The dithiazine may he isolated from a whole spent fluid formed by reaction of hydrogen sulfide and a triazine. Alternately, the whole spent fluid containing the dithiazine may be introduced into the well. The dithiazines of formulae (II) and (III) are quaternized derivatives of the dithiazine of formula (I). In addition, the dithiazine or whole spent fluid or quaternized dithiazine may be formulated with at least one component selected from alkyl, alkylaryl arylalkyl or arylamine quaternary salts; mono or polycyclic aromatic amine salts; imidazoline derivative or a quaternary salt thereof; a mono-, di- or trialkyl or alkylaryl phosphate ester; or a monomeric or oligomeric fatty acid.
1. A quaternized dithiazine of the formula:
wherein:
R is —CH 3 or —CH 2 CH 2 OH,
R 1 is benzyl or naphthylmethyl;
R 2 is —CH 2 —CH 2 —CH 2 —CH 2 — or —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —; and
X is —Cl, —Br or —I.
2. The quaternized dithiazine of claim 1 wherein X is —Cl.
3. The quaternized dithiazine of claim 2 having the structural formula (A) wherein R is —CH 2 CH 2 OH and R 1 is naphthylmethyl.
4. The quaternized dithiazine of claim 2 having the structural formula (A) wherein R is CH 3 and R 1 is naphthylmethyl.
5. The quaternized dithiazine of claim 2 having the structural formula (A) wherein R is —CH 2 CH 2 OH and R 1 is benzyl.
6. The quaternized dithiazine of claim 2 , having the structural formula (A) wherein R is —CH 3 and R 1 is benzyl.
7. The quaternized dithiazine of claim 2 having the structural formula (B) wherein R is HO—CH 2 —CH 2 — and R 2 is selected from the group consisting of —CH 2 —CH 2 —CH 2 —CH 2 — and —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —.
8. A method of inhibiting corrosion of 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 quaternized dithiazine of the formula:
wherein:
R is selected from the group consisting of a C 1 to C 12 saturated or unsaturated hydrocarbyl group or a C 1 to C 10 ω-hydroxy saturated or unsaturated hydrocarbyl group;
R 1 is selected from the group consisting of a C 1 -C 24 straight chain or branched alkyl group or a C 1 -C 24 arylalkyl group; and
R 2 is a straight or branched chain C 1 -C 6 alkylene group; and
each X is chlorine, bromine or iodine
for a time sufficient to inhibit corrosion of the iron and ferrous base materials.
9. The method of claim 8 , which further comprises introducing into the well, with the quaternized dithiazine at least one component selected from the group consisting of:
(a) an alkyl, hydroxyalkyl, alkylaryl arylalkyl or arylamine quaternary salt;
(b) a mono or polycyclic aromatic amine salt;
(c) an imidazoline derivative;
(d) a mono-, di- or trialkyl or alkylaryl or arylalkyl phosphate ester; and
(e) a monomeric or oligomeric fatty acid.
10. The method of claim 9 , wherein the at least one component is an alkyl, hydroxyalkyl, alkylaryl arylalkyl or arylamine quaternary salt.
11. The method of claim 10 , wherein the quaternary salt of the at least one component is of the formula [N + R 5 R 6 R 7 R 8 ][X − ] wherein each of R 5 , R 6 , R 7 and R 8 contain 1 to about 18 carbon atoms and X is Cl, Br or I.
12. The method of claim 11 , wherein at least one of R 5 , R 6 , R 7 and R 8 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 or arylalkyl.
13. The method of claim 8 , wherein the quaternized dithiazine is of the structure (A) wherein R is —R 3 —OH and further wherein R 3 is an alkylene group.
14. The method of claim 13 , wherein R is a C 1 -C 6 —OH group.
15. The method of claim 14 , wherein R is —CH 2 CH 2 —OH.
16. The method of claim 8 , wherein the quaternized dithiazine is of the structure (A) wherein R is —CH 2 CH 2 —OH or —CH 3 and R 1 is either 1-naphthyl methylene or benzyl.
17. The method of claim 16 , wherein the quaternized dithiazine is of the formula:
18. The method of claim 17 , wherein X is chlorine.
19. The method of claim 16 , wherein the quaternized dithiazine is of the formula:
20. The method of claim 19 , wherein X is chlorine.
21. The method of claim 16 , wherein the quaternized dithiazine is of the formula:
22. The method of claim 21 , wherein X is chlorine.
23. The method of claim 16 , wherein the quaternized dithiazine is of the formula:
24. The method of claim 23 , wherein X is chlorine.
25. The method of claim 8 , wherein the quaternized dithiazine is prepared by reacting a dithiazine of the formula:
with either a compound of the formula R 1 X or X—R 4 —X wherein R 4 is a C 1 -C 6 alkylene group.
26. The method of claim 25 , wherein the dithiazine is isolated from a spent fluid formed by reaction of hydrogen sulfide and a triazine of the formula:
27. The method of claim 25 , wherein the dithiazine is a component of the spent fluid formed by reaction of hydrogen sulfide and a triazine of the formula:
28. The method of claim 8 , wherein the quaternized dithiazine is of the structure (A) wherein R 1 is a straight chain or branched C 1 -C 12 alkyl group.
29. The method of claim 8 , wherein the quaternized dithiazine is of the structure (A) wherein R 1 is a straight chain or branched C 1 -C 6 alkyl group.
30. The method of claim 8 , wherein the quaternized dithiazine is of the structure (B) wherein R is —CH 3 or —CH 2 CH 2 OH and R 2 is —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 — or —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —.
31. The method of claim 8 , wherein the quaternized dithiazine is introduced into the well during stimulation.
32. The method of claim 8 , whereby the corrosive effect of an acid solution on metal contacted by an aqueous acid solution is minimized by the addition of the quaternized dithiazine to the well.