Multiple hydrophilic head corrosion inhibitors
View Patent ↗Compounds comprising multiple hydrophilic heads and a lipophilic tail may be contacted with a metal or other surface so as to adhere to the surface and inhibit corrosion, among other things. Suitable hydrophilic heads may include quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such corrosion-inhibiting compounds may be introduced into a wellbore penetrating at least a portion of a subterranean formation, for instance in oil and/or gas recovery operations and the like, whereupon the compound may adhere to a metal or other surface downhole so as to inhibit corrosion of the surface. These compounds may be employed in various other environments, such as any metal or other surface that may be exposed to corrosive conditions.
1. A method comprising:
introducing a composition comprising a hydrophilic solvent and a corrosion-inhibiting compound into a wellbore penetrating at least a portion of a subterranean formation; and
contacting a metal surface in the wellbore with the corrosion-inhibiting compound such that the corrosion-inhibiting compound adheres to at least a portion of the metal surface, thereby inhibiting corrosion of the metal surface;
wherein the composition comprises a corrosion-inhibiting compound or a salt thereof, the corrosion-inhibiting compound comprising a lipophilic tail, three or more hydrophilic heads for each lipophilic tail of the compound, a first linking group linking a first one and a second one of the hydrophilic heads, and a second linking group linking the second one and a third one of the hydrophilic heads; and
wherein at least two of the hydrophilic heads are cationic hydrophilic heads comprising a moiety having the chemical formula R 1 R 2 R 3 M + , wherein each of R 1 and R 2 is CH 3 , and R 3 is benzyl; and wherein M is either nitrogen or phosphorous.
2. The method of claim 1 wherein each cationic hydrophilic head comprises a cation moiety independently selected from the group consisting of: quaternary ammonium cation moiety; tertiary ammonium cation moiety; phosphonium cation moiety; and any combination thereof.
3. The method of claim 1 wherein the corrosion-inhibiting compound comprises the reaction product of a reaction process that comprises (i) a first reaction between a long-chain primary amine and an epihalohydrin, and (ii) a second reaction between the product of the first reaction with an amine selected from the group consisting of a secondary amine, a tertiary amine, and any combination thereof.
4. The method of claims 1 wherein M is nitrogen.
5. The method of claim 1 wherein M is phosphorous.
6. The method of claim 1 wherein the first linking group and the second linking group comprise a hydroxypropyl moiety.
7. The method of claim 1 wherein the first linking group and the second linking group comprise a hydrocarbon chain.
8. The method of claim 7 wherein the hydrocarbon chain further comprises one or more functional groups selected from the group consisting of an ether, an ester, a carboxylate, a sulfonate, a sulfonic ester, a carboxyl ester, a hydroxyl, an alkane, an alkene, an alkyne, a long-chain polymer, a short-chain polymer, or any combination thereof.
9. The method of claim 1 wherein each lipophilic tail comprises a C 3 to C 50 hydrocarbon chain.
10. The method of claim 1 wherein the corrosion-inhibiting compound is present in a concentration of from 2 ppm to 50 ppm.
11. The method of claim 3 wherein the reaction process occurs at a temperature in a range of from 20° C. to 80° C.
12. The method of claim 1 wherein inhibiting corrosion of the metal surface further comprises increasing the hydrophobicity of the surface.