Self-breaking retarded acid emulsion

Patent · Tue Feb 20 04:00:00 EST 1979

OSTI ID:6956318

Scherubel, G A

A subterranean formation is acidized with an acid-in-oil emulsion consisting of an aqueous acidizing solution, an oil, an alkyl C/sub 8/ to C/sub 18/ primary fatty amine, and at least one diethanolamide of at least one C/sub 8/ to C/sub 18/ fatty acid. The present invention is an improved acid-in-oil acidizing emulsion, and acidizing method such as an emulsion, the emulsion being of the type containing an effective amount of at least one C/sub 8/ to C/sub 18/ primary amine as a cationic surfactant to increase the normal reaction. The diethanolamine is a nonionic surfactant which causes the emulsion to break as the acidizing capacity of the emulsion becomes substantially depleted, i.e., spent, on the formation. 41 claims.

• Assignee: Dow Chemical Co.
• Patent Number(s): US 4140640
• OSTI ID: 6956318
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
42 ENGINEERING
422000 -- Engineering-- Mining & Underground Engineering-- (1980-)
ACIDIZATION
AMINES
CHEMICAL COMPOSITION
COLLOIDS
DISPERSIONS
EMULSIONS
FLUIDS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
STIMULATION
SURFACTANTS
WELL STIMULATION
WELLS
WORKING FLUIDS