Anionic copolymers for improved control of drilling fluid rheology

Patent · Tue Jul 14 04:00:00 EDT 1987

OSTI ID:6311473

Portnoy, R C

An aqueous drilling fluid is described comprising a water base, calcium ions a clayey material suspended in the water base, calcium ions and from about 0.25 pounds per barrel (ppb) to about 8 ppb based on the total volume of the fluid of a copolymer consisting essentially of acrylic acid and alkali metal vinyl-sulfonate salt and having a molecular weight (Mw) of from 2,000 to 10,000. The monomer mole ratio of the acrylic acid to sulfonate in the copolymer is 1:1 to 19:1.

• Assignee: Exxon Chemical Patents Inc., Linden, NJ
• Patent Number(s): US 4680128
• OSTI ID: 6311473
• 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
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CALCIUM COMPOUNDS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
COPOLYMERS
DISPERSIONS
DRILLING FLUIDS
FLUIDS
HYDROGEN COMPOUNDS
MIXTURES
MOLECULAR WEIGHT
MONOCARBOXYLIC ACIDS
MONOMERS
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
QUANTITY RATIO
RHEOLOGY
SOLUTIONS
SULFONATES
WATER
WELLS