High temperature drilling fluids

Patent · Tue Jul 22 04:00:00 EDT 1986

OSTI ID:5310127

Stong, R E; Walinsky, S W

A partially amidated terpolymer is described which consists of: (a) maleic anhydride; (b) styrene; and (c) acrylic or methacrylic acid; Wherein the molecular ratio of the components (a), (b) and (c) is from about 30:10:60 to about 50:40:10; and wherein from about 1-42 percent of carboxylic functionality has been converted to amide functionality by treatment with ammonia, ammonium hydroxide or primary or secondary lower alkyl amines having from about 1-5 carbon atoms in each alkyl group; the weight average molecular weight of the partially amidated terpolymer being from about 500-10,000.

• Assignee: Pfizer, Inc., New York, NY
• Patent Number(s): US 4602067
• OSTI ID: 5310127
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLIC ACID
ALKYLATED AROMATICS
AMIDES
AMINES
AMMONIUM COMPOUNDS
AMMONIUM HYDROXIDES
ANHYDRIDES
AROMATICS
CARBON
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
COPOLYMERS
DICARBOXYLIC ACIDS
DRILLING FLUIDS
ELEMENTS
FLUIDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
MALEIC ACID
METHACRYLIC ACID
MOLECULAR WEIGHT
MONOCARBOXYLIC ACIDS
NATURAL GAS WELLS
NONMETALS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERS
QUANTITY RATIO
STYRENE
TEMPERATURE EFFECTS
WELLS