Invert emulsion drilling fluid comprising oligamide composition

Patent · Tue Mar 11 04:00:00 EST 1986

OSTI ID:5717495

Clapper, D K; Perricone, A C; Salisbury, D P

A water-in-oil emulsion fluid is described for use in the drilling, completion or workover of a subterranean well comprising: (1) a liquid hydrocarbon base; (2) an aqueous phase; and (3) a surfactant, the surfactant comprising: an oligamide prepared by reacting from between about 20 mole percent and about 35 mole percent of a polyalkylene polyamine having two or more alkylene groups separated by nitrogen atoms, and from between about 30 mole percent and about 70 mole percent of a fatty acid having from between about 6 to about 20 carbon atoms therein. The polyamine and fatty acid is reacted to form a diamide intermediate product, the diamide intermediate product being further reacted with from between about 15 mole percent to about 35 mole percent of a tricarboxylic acid selected from citric acid and trimellitic acid to form an oligamide. The surfactant, when diluted to 70 percent w/w concentration with a suitable solvent, having an acid value from about 26 to about 46. The surfactant has a total amine value from between about 10 to about 30, the drilling fluid produced with the surfactant having an ES/sub 3/ of at least about 400 volts, and an ES/sub 5/ greater than the ES/sub 4/ thereof, the ES/sub 5/ being greater than about 1,000 volts.

• Assignee: Milchem, Inc., Houston, TX
• Patent Number(s): US 4575428
• OSTI ID: 5717495
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AMIDES
AMINES
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COLLOIDS
DILUTION
DISPERSIONS
DRILLING FLUIDS
ELEMENTS
EMULSIONS
FLUIDS
HYDROGEN COMPOUNDS
NITROGEN
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
QUANTITY RATIO
SOLVENTS
SURFACTANTS
SYNTHESIS
WATER
WELL COMPLETION