US 11,987,746 B2
Ionic liquid corrosion inhibitors
Robert August Zeller, Houston, TX (US); and Philippe Prince, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 17/615,997
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
PCT Filed Jul. 2, 2019, PCT No. PCT/US2019/040232
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2021/002848, PCT Pub. Date Jan. 7, 2021.
Prior Publication US 2022/0243118 A1, Aug. 4, 2022
Int. Cl. C09K 8/54 (2006.01); C23F 11/16 (2006.01); E21B 41/02 (2006.01)
CPC C09K 8/54 (2013.01) [C23F 11/163 (2013.01); E21B 41/02 (2013.01); C09K 2208/32 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
contacting a metal surface with a fluid comprising a corrosion inhibitor additive by injecting the corrosion inhibitor additive using a capillary injection system, wherein the capillary injection system comprises a capillary injection tube connected to a side-pocket mandrel at a lower section of a production tubing;
wherein the corrosion inhibitor additive comprises an ionic liquid;
wherein the ionic liquid comprises an organic cation and an organic anion, wherein the organic anion comprises two anionic moieties, a carboxylate anionic moiety and a phosphonate anionic moiety, wherein the organic cation comprises an ammonium cationic moiety, wherein the ionic liquid has a stoichiometric ratio of anionic moieties to cationic moieties from 1:1 to 1:2;
wherein the two anionic moieties and the ammonium cationic moiety each comprises R1, R2, R3, and R4, wherein each of R1, R2, R3, and R4 comprises a hydrocarbon chain;
wherein the two anionic moieties are bonded via a linking moiety comprising a C1 to C20 hydrocarbon chain;
wherein at least one of R1, R2, R3, R4, and the linking moiety comprises a heteroatom; and
wherein the corrosion inhibitor additive at least partially inhibits corrosion of the metal surface.