High temperature drilling fluids

Patent · Tue Jan 28 04:00:00 EST 1986

OSTI ID:5921507

Stong, R E; Walinsky, S W

This patent describes an aqueous drilling fluid suitable for high-temperature use. This fluid is composed of a water base. Clay is suspended in the base and from about 0.01-25 pounds per barrel total composition of a hydrolyzed terpolymer of maleic anhydride, styrene and a third monomer selected from acrylamide, methacrylamide, acrylic acid and metacrylic acid. The molar ratio of maleic anhydride to styrene to the third monomer is from about 30:10:60 to 50:40:10, and the alkali metal, ammonium and lower aliphatic amine salts thereof, the weight-average molecular weight of the hydrolyzed terpolymer is from about 500-10,000.

• Assignee: Pfizer, Inc., New York, NY
• Patent Number(s): US 4566978
• OSTI ID: 5921507
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLAMIDE
ACRYLIC ACID
ALKYLATED AROMATICS
AMIDES
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CLAYS
DICARBOXYLIC ACIDS
DISPERSIONS
DRILLING FLUIDS
FLUIDS
HYDROCARBONS
HYDROGEN COMPOUNDS
MALEIC ACID
METHACRYLIC ACID
MIXTURES
MOLECULAR WEIGHT
MONOCARBOXYLIC ACIDS
MONOMERS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
QUANTITY RATIO
SOLUTIONS
STYRENE
WATER