Composition for remediating iron sulfide in oilfield production systems

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
• R10 is a C1-C20 alkyl or a C1-C20 alkoxyalkyl group;
• R12 and R13 are independently hydrogen or a C1-C6 alkyl group,
• R11 and R14 are independently hydrogen, C1-C6 alkyl, C1-C6 hydroxyalkyl, or C1-C6 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
• R10 is a C1-C20 alkyl or a C1-C20 alkoxyalkyl group;
• R12 and R13 are independently hydrogen or a C1-C6 alkyl group,
• R11 and R14 are independently hydrogen, C1-C6 alkyl, C1-C6 hydroxyalkyl, or C1-C6 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:
• R1 and R2 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;
• R3 and R4 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;
• L1 and L2 are each independently absent, H, —COOH, —SO3H, —PO3H2, —COOR5, —CONH2, —CONHR5, or --CON(R5)2;
• R5 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, L2 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
• R9 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.