Composition and process for removing sulfur scale from interstices in petroleum bearing formations and the like to improve the flow of petroleum

Patent · Tue Jul 22 04:00:00 EDT 1980

OSTI ID:5088454

Ashby, R; Kaveggia, F

A composition suitable for the essentially complete dissolution of sulfur scale from petroleum passages comprising: (A) an aqueous acidic solution of a primary acid selected from the class consisting of hydrochloric acid, phosphoric acid, formic acid, citric acid, oxalic acid, and any of said acids intensified with hydrofluoric acid; (B) minor amounts of a vanadium compound selected from at least one member of the class consisting of vanadium pentoxide, vanadyl sulfate, vanadyl chloride and vanadyl phosphate, the vanadium compound being present in the amount of at least about 0.01 weight percent; (C) minor amounts of a second acid selected from at least one member of the class consisting of acetic acid, hydroxymalonic acid, dihydroxymalonic acid, malonic acid, and ethylene-diamine-tetraacetic acid; and (D) the second acid being present in the composition in the amount of at least about 0.5 weight percent.

• Assignee: IFI; ERA-06-000184; EDB-80-121463
• Patent Number(s): US 4213866
• OSTI ID: 5088454
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALCOHOLS
CARBOXYLIC ACIDS
CATALYTIC EFFECTS
CHELATING AGENTS
DESCALING
DICARBOXYLIC ACIDS
DISSOLUTION
ELEMENTS
ENERGY SOURCES
ENHANCED RECOVERY
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GLYCEROL
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
MINERAL RESOURCES
NONMETALS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM DEPOSITS
RECOVERY
RESOURCES
SULFUR
SURFACE FINISHING
SURFACTANTS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
WELLS
WETTING AGENTS