Composition for remediating iron sulfide in oilfield production systems

Abstract

A composition for inhibiting corrosion and/or removing hydrocarbonaceous deposits in oil and gas applications is provided. The composition comprises an iron sulfide dissolver, an organic solvent, and a corrosion inhibitor.

1 - 34 . (canceled) 
     
     
         35 . A method of inhibiting corrosion and inhibiting iron sulfide formation at a surface and removing hydrocarbonaceous deposits from the surface, the method comprising:
 adding an iron sulfide dissolver to a fluid which contacts a surface of a wellbore or equipment used in production, processing, transportation, storage or separation of the fluid to inhibit corrosion and/or remove hydrocarbonaceous deposits from the surface,   the iron sulfide dissolver comprising allaric acid, altaric acid, altraric acid, altronic acid, arabinaric acid, arabinonic acid, dihomocitric acid, fructuronic acid, fuconic acid, galactaric acid, galactonic acid, galacturonic acid, glucaric acid, glucoheptonic acid, gluconic acid, glucuronic acid, gulonic acid, homocitric acid, homoisocitric acid, idaric acid, idonic acid, iduronic acid, isocitric acid, mannaric acid, mannonic acid, octulosonic acid, rhamnonic acid, ribonic acid, tagaturonic acid, xylonic acid, or xyluronic acid, or a salt or derivative thereof, or a combination thereof;   the fluid comprising natural gas or a liquid hydrocarbon.   
     
     
         36 . The method of  claim 35 , wherein the iron sulfide dissolver comprises gluconic acid, a salt thereof, or a combination thereof. 
     
     
         37 . The method of  claim 35 , wherein the iron sulfide dissolver comprises sodium gluconate, ammonium gluconate, potassium gluconate, lithium gluconate, magnesium gluconate, calcium gluconate, cesium gluconate, gluconic acid, sodium glucarate, ammonium glucarate, potassium glucarate, lithium glucarate, magnesium glucarate, calcium glucarate, cesium glucarate, glucaric acid, or a combination thereof. 
     
     
         38 . The method of  claim 35 , wherein the iron sulfide dissolver comprises sodium gluconate, ammonium gluconate, potassium gluconate, lithium gluconate, magnesium gluconate, calcium gluconate, cesium gluconate, gluconic acid, or a combination thereof. 
     
     
         39 . The method of  claim 35 , wherein:
 the equipment comprises a pipeline, a storage vessel, downhole injection tubing, a flow line, or an injection line.   
     
     
         40 . A composition for inhibiting corrosion and/or removing hydrocarbonaceous deposits in oil and gas applications, the composition comprising:
 an iron sulfide dissolver comprising allaric acid, altaric acid, altraric acid, altronic acid, arabinaric acid, arabinonic acid, dihomocitric acid, fructuronic acid, fuconic acid,galactaric acid, galactonic acid, galacturonic acid, glucaric acid, glucoheptonic acid, gluconic acid, glucuronic acid, gulonic acid, homocitric acid, homoisocitric acid, idaric acid, idonic acid, iduronic acid, isocitric acid, mannaric acid, mannonic acid, octulosonic acid, rhamnonic acid, ribonic acid, tagaturonic acid, xylonic acid, or xyluronic acid, or a salt or derivative thereof, or a combination thereof;   an organic solvent; and   a corrosion inhibitor comprising one or more of the following compounds:
 (A) an imidazoline of Formula (I): 
                     
  wherein
 R 10  is a C 1 -C 20  alkyl or a C 1 -C 20  alkoxyalkyl group; 
 R 12  and R 13  are independently hydrogen or a C 1 -C 6  alkyl group, 
 R 11  and R 14  are independently hydrogen, C 1 -C 6  alkyl, C 1 -C 6  hydroxyalkyl, or C 1 -C 6  arylalkyl; and 
 X -  is a halide, carbonate, sulfonate, phosphate, or an anion of an organic carboxylic acid; 
 or a tautomer thereof; 
 
 (B) an imidazolinium salt of Formula (II): 
                     
  wherein
 R 10  is a C 1 -C 20  alkyl or a C 1 -C 20  alkoxyalkyl group; 
 R 12  and R 13  are independently hydrogen or a C 1 -C 6  alkyl group, 
 R 11  and R 14  are independently hydrogen, C 1 -C 6  alkyl, C 1 -C 6  hydroxyalkyl, or C 1 -C 6  arylalkyl; and 
 X -  is a halide, carbonate, sulfonate, phosphate, or an anion of an organic carboxylic acid; 
 or a tautomer thereof; 
 
 (C) a bis-quatemized imidazoline compound of Formula (III): 
                     
  wherein:
 R 1  and R 2  are each independently unsubstituted branched, chain or ring alkyl or alkenyl having from 1 to about 29 carbon atoms; partially or fully oxygenized, sulfurized, and/or phosphorylized branched, chain, or ring alkyl or alkenyl having from 1 to about 29 carbon atoms; or a combination thereof; 
 R 3  and R 4  are each independently unsubstituted branched, chain or ring alkylene or alkenylene having from 1 to about 29 carbon atoms; partially or fully oxygenized, sulfurized, and/or phosphorylized branched, chain, or ring alkylene or alkenylene having from 1 to about 29 carbon atoms; or a combination thereof; 
 L 1  and L 2  are each independently absent, H, —COOH, —SO 3 H, —PO 3 H 2 , —COOR 5 , —CONH 2 , —CONHR 5 , or --CON(R 5 ) 2 ; 
 R 5  is each independently a branched or unbranched alkyl, aryl, alkylaryl, alkylheteroaryl, cycloalkyl, or heteroaryl group having from 1 to about 10 carbon atoms; 
 n is 0 or 1, and when n is 0, L 2  is absent or H; 
 x is from 1 to about 10; and 
 y is from 1 to about 5; 
 
 (D) a pyridinium compound of Formula (V): 
                     
  wherein
 R 9  is an alkyl group, an aryl group, or an arylalkyl group, wherein said alkyl groups have from 1 to about 18 carbon atoms; and 
 X -  is a halide; or 
 
 (E) a combination thereof. 
   
     
     
         41 . The composition of  claim 40 , wherein the iron sulfide dissolver comprises gluconic acid, a salt thereof, or a combination thereof. 
     
     
         42 . The composition of  claim 40 , wherein the iron sulfide dissolver comprises sodium gluconate, ammonium gluconate, potassium gluconate, lithium gluconate, magnesium gluconate, calcium gluconate, cesium gluconate, gluconic acid, sodium glucarate, ammonium glucarate, potassium glucarate, lithium glucarate, magnesium glucarate, calcium glucarate, cesium glucarate, glucaric acid, or a combination thereof. 
     
     
         43 . The composition of  claim 40 , wherein the iron sulfide dissolver comprises sodium gluconate, ammonium gluconate, potassium gluconate, lithium gluconate, magnesium gluconate, calcium gluconate, cesium gluconate, gluconic acid, or a combination thereof. 
     
     
         44 . The composition of  claim 40 , wherein the organic solvent comprises an alcohol, a hydrocarbon, a ketone, an ether, an alkylene glycol, a glycol ether, an amide, a nitrile, a sulfoxide, an ester, a polyol, or a combination thereof, and the composition optionally comprises water. 
     
     
         45 . The composition of  claim 40 , wherein the organic solvent comprises methanol, ethanol, propanol, isopropanol, butanol, 2-ethylhexanol, hexanol, octanol, decanol, 2-butoxyethanol, methylene glycol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, diethyleneglycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol dibutyl ether, pentane, hexane, cyclohexane, methylcyclohexane, heptane, decane, dodecane, diesel, toluene, xylene, heavy aromatic naphtha, cyclohexanone, diisobutylketone, diethyl ether, propylene carbonate, N-methylpyrrolidinone, N,N-dimethylformamide, glycerin, or a combination thereof. 
     
     
         46 . The composition of  claim 40 , wherein the organic solvent comprises methanol, ethanol, ethylene glycol, glycerin, or a combination thereof. 
     
     
         47 . The composition of  claim 40 , wherein the composition comprises from about 5 wt. % to about 95 wt.% of the iron sulfide dissolver, from about 5 to about 95 wt.% of the organic solvent, and from about 5 to about 95 wt. % of the corrosion inhibitor. 
     
     
         48 . The composition of  claim 40 , wherein the composition comprises from about 10 wt. % to about 60 wt.% of the iron sulfide dissolver, from about 10 to about 60 wt.% of the organic solvent, and from about 10 to about 60 wt. % of the corrosion inhibitor. 
     
     
         49 . The composition of  claim 40 , wherein the composition comprises from about 15 wt. % to about 30 wt.% of the iron sulfide dissolver, from about 20 to about 40 wt.% of the organic solvent, and from about 15 to about 30 wt. % of the corrosion inhibitor. 
     
     
         50 . The composition of  claim 40 , wherein the composition further comprises at least one of an asphaltene inhibitor, a paraffin inhibitor, a scale inhibitor, an emulsifier, a water clarifier, a dispersant, an emulsion breaker, a hydrogen sulfide scavenger, a gas hydrate inhibitor, a biocide, a pH modifier, and a surfactant. 
     
     
         51 . The composition of  claim 40 , wherein the composition further comprises a scale inhibitor.