Drilling fluids containing amps, acrylic acid, itaconic acid polymer

Patent · Tue Oct 13 04:00:00 EDT 1987

OSTI ID:5770854

Bardoliwalla, D F

This patent describes an aqueous drilling fluid having present in an amount sufficient to reduce fluid loss of the drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component, there being from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component. The polymer has a weight average molecular weight of between about 50,000 to about 1,000,000 being in its free acid or partially or completely neutralized form and being at least water dispersible. A method is described of drilling a well into a subterranean formation in which an aqueous drilling fluid is circulated into the well. The step of circulating the drilling fluid contains in an amount sufficient to reduce fluid loss of the drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component. There is from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component. The polymer has weight average molecular weight of between about 50,000 to about 1,000,000 in its free acid or partially or completely neutralized form and is at least water dispersible.

• Assignee: Diamond Shamrock Chemicals Co.
• Patent Number(s): US 4699225
• OSTI ID: 5770854
• 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
ALKANES
ALKYL RADICALS
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
DICARBOXYLIC ACIDS
DISPERSIONS
DRILLING FLUIDS
FLUIDS
HYDROCARBONS
ITACONIC ACID
METHYL RADICALS
MIXTURES
MONOCARBOXYLIC ACIDS
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLYMERS
PROPANE
RADICALS
SOLUTIONS
SULFONIC ACIDS
WELLS