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Aqueous drilling fluids containing fluid loss additives

Patent ·
OSTI ID:7200107
;
This patent describes a copolymer of (1) from about 80% to about 98% by weight of acrylic acid and (2) from about 2% to about 20% by weight of itaconic acid. The copolymer has a weight average molecular weight of between about 1000,000 to about 1,000,000, is in the form of its free acid or partially or completely sodium, potassium or ammonium neutralized salt and is at least water dispersible. The partially neutralized salt is prepared by reacting carboxylic groups present in the acrylic acid and the itaconic acid with neutralizing agent, the copolymer being useful as a fluid loss control additive for aqueous drilling fluids.
Assignee:
Diamond Shamrock Chemical Co., Dallas, TX
Patent Number(s):
US 4622370
OSTI ID:
7200107
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLIC ACID
ADDITIVES
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
CARBOXYLIC ACIDS
COPOLYMERS
DRILLING FLUIDS
FLUIDS
HYDROGEN COMPOUNDS
LOST CIRCULATION
MOLECULAR WEIGHT
MONOCARBOXYLIC ACIDS
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERS
POTASSIUM COMPOUNDS
QUANTITY RATIO
SODIUM COMPOUNDS
SOLUBILITY
WATER
WELLS