Dissolution of sulfate scales

Patent · Tue Nov 26 04:00:00 EST 1991

OSTI ID:5596540

Hen, J

This patent describes a composition for the removal of sulfate scale from surfaces. It comprises: an aqueous solution of about 0.1 to 1.0 molar concentration of an aminopolycarboxylic acid (APCA) containing 1 to 4 amino groups or a salt thereof, and about 0.1 to 1.0 molar concentration of a second component which is diethylenetriaminepenta (methylenephosphonic acid) (DTPMP) or a salt thereof, or aminotri (methylenephosphonic acid) (ATMP) or a salt thereof as an internal phase enveloped by a hydrocarbon membrane phase which is itself emulsified in an external aqueous phase, the hydrocarbon membrane phase continuing a complexing agent weaker for the cations of the sulfate scale than the APCA and DTPMP or ATMP, any complexing agent for the cations in the external aqueous phase being weaker than that in the hydrocarbon membrane phase.

• Assignee: Mobil Oil Corp., Fairfax, VA (United States)
• Patent Number(s): A; US 5068042
• Application Number: PPN: US 7-558957
• OSTI ID: 5596540
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
023000 -- Petroleum-- Properties & Composition
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AMINES
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CONTROL
CORROSION INHIBITORS
CORROSIVE EFFECTS
DISSOLUTION
HYDROCARBONS
KINETICS
OIL WELLS
OPTIMIZATION
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
REACTION KINETICS
SCALE CONTROL
SULFATES
SULFUR COMPOUNDS
WELLS