Polymers are provided for use in inhibiting gas hydrate formation and/or corrosion in hydrocarbon-containing fluids. The polymer comprises repeat units derived from a first monomer comprising N-[3-(dibutylamino)propyl]methacrylamide (DBAPAMA) or an alkyl, acetyl, acryloyl or benzyl quaternary salt thereof, N-[3-(diisobutyl)propyl]methacrylamide or an alkyl, acetyl, acryloyl or benzyl quaternary salt thereof, N-[3-(diisopentyl)propyl]methacrylamide or an alkyl, acetyl, acryloyl or benzyl quaternary salt thereof, or a combination thereof; and repeat units derived from a second monomer comprising acrylamide, N-alkylacrylamide, N-alkyl (alkyl)acrylamide, ((dialkylamino)alkyl)acrylamide or an alkyl or benzyl quaternary salt thereof, ((dialkylamino)alkyl)alkylacrylamide or an alkyl or benzyl quaternary salt thereof, acrylic acid, alkyl acrylate, N,N-(dialkylamino)alkyl acrylate or an alkyl or benzyl quaternary salt thereof, N,N-(dialkylamino)alkyl (alkyl)acrylate or an alkyl or benzyl quaternary salt thereof, hydroxyalkyl acrylate, hydroxyalkyl (alkyl)acrylate, acrylamido alkyl sulfonic acid or a salt thereof, a diallyl dialkyl quaternary ammonium salt, or a combination thereof. The second monomer does not comprise the first monomer.

A method for treating surfaces of equipment comprising applying a Self Assembled Monolayer of a moiety to at least one surface of the equipment, wherein the equipment is selected from the group consisting of level sensors, sucker rods, turbine meters, Coriolis meters, magnetic flow meters, down hole pumps, check valves, valves, cables, drill bits, wire lines, and pigs, and the moiety may be present in mono, di or tri headed form or as a bis, gem-bis or tris headed form, and is selected from the group consisting of thiols, amines, silanes, siloxanes, selenides, tellurides, isocyanides, or heterocycles, and equipment having at least one surface comprising such a treated surface.

A method for treating surfaces of equipment comprising applying a Self Assembled Monolayer of a moiety to at least one surface of the equipment, wherein the equipment is selected from the group consisting of level sensors, sucker rods, turbine meters, Coriolis meters, magnetic flow meters, down hole pumps, check valves, valves, cables, drill bits, wire lines, and pigs, and the moiety may be present in mono, di or tri headed form or as a bis, gem-bis or tris headed form, and is selected from the group consisting of thiols, amines, silanes, siloxanes, selenides, tellurides, isocyanides, or heterocycles, and equipment having at least one surface comprising such a treated surface.

Methods for making sulfide scavenging compositions are provided. The method comprises reducing a settling velocity of the sulfide scavenging composition in a fluid stream by adjusting the specific gravity of the sulfide scavenging composition to within about fifteen percent or less of the specific gravity of the fluid stream. Sulfide scavengers using the above method are also disclosed. Methods for removing sulfides from fluid streams are also provided. The methods include adding the above sulfide scavengers to fluid streams.

Methods for making sulfide scavenging compositions are provided. The method comprises reducing a settling velocity of the sulfide scavenging composition in a fluid stream by adjusting the specific gravity of the sulfide scavenging composition to within about fifteen percent or less of the specific gravity of the fluid stream. Sulfide scavengers using the above method are also disclosed. Methods for removing sulfides from fluid streams are also provided. The methods include adding the above sulfide scavengers to fluid streams.

An ecofriendly corrosion inhibitor composition and a method for inhibiting corrosion on a metal surface with the ecofriendly corrosion inhibitor composition are provided. The ecofriendly corrosion inhibitor composition includes 10-30 weight % of fatty acids derived from waste vegetable oils and 70-90 weight % of heavy aromatic naphtha. The fatty acids derived from waste vegetable oils include oleic acid, linoleic acid, and palmitic acid. In the method, the ecofriendly corrosion inhibitor composition is added to a hydrocarbon fluid exposed to the metal surface and the corrosion inhibitor composition inhibits corrosion on the metal surfaces.

An ecofriendly corrosion inhibitor composition and a method for inhibiting corrosion on a metal surface with the ecofriendly corrosion inhibitor composition are provided. The ecofriendly corrosion inhibitor composition includes 10-30 weight % of fatty acids derived from waste vegetable oils and 70-90 weight % of heavy aromatic naphtha. The fatty acids derived from waste vegetable oils include oleic acid, linoleic acid, and palmitic acid. In the method, the ecofriendly corrosion inhibitor composition is added to a hydrocarbon fluid exposed to the metal surface and the corrosion inhibitor composition inhibits corrosion on the metal surfaces.

A method for treating surfaces of equipment comprising applying a Self Assembled Monolayer of a moiety to at least one surface of the equipment, wherein the equipment is selected from the group consisting of level sensors, sucker rods, turbine meters, Coriolis meters, magnetic flow meters, down hole pumps, check valves, valves, cables, drill bits, wire lines, and pigs, and the moiety may be present in di or tri headed form or as a bis, gem-bis or tris headed form, and is a phosphonate, and equipment having at least one surface comprising such a treated surface.

A method for treating surfaces of equipment comprising applying a Self Assembled Monolayer of a moiety to at least one surface of the equipment, wherein the equipment is selected from the group consisting of level sensors, sucker rods, turbine meters, Coriolis meters, magnetic flow meters, down hole pumps, check valves, valves, cables, drill bits, wire lines, and pigs, and the moiety may be present in di or tri headed form or as a bis, gem-bis or tris headed form, and is a phosphonate, and equipment having at least one surface comprising such a treated surface.

Treatment of crude oil with basic ionic liquids (ILs), results in scavenging of any hydrochloric acid (HCl) that is present to remove the HCl. The IL is a quaternary ammonium compound having the formula R.sub.4N.sup.+X.sup. or R.sub.3N.sup.+RN.sup.+R.sub.3, where R is independently an alkyl group, an alkylbenzyl group, a hydroxyalkyl group, or a hydroxyalkylbenzyl group, and R is straight or branched and has 1-22 carbon atoms, R is a straight or branched alkylene or oxyalkylene having 1 to 10 carbon atoms, and where X.sup. is selected from the group consisting of hydroxide, carbonate, alkylcarbonate, bicarbonate or alkoxide, where the alkyl group of the alkyl-carbonate or alkoxide, if present, is straight or branched and has 1 to 8 carbon atoms. The ILs are introduced into the crude oil after the refinery desalters and before the crude distillation tower to prevent or inhibit HCl from distilling to the crude tower overhead.