Additive systems for control of fluid loss in aqueous drilling fluids at high temperatures

Patent · Tue Dec 02 04:00:00 EST 1986

OSTI ID:6961936

Dickert, Jr, J J; Heilweil, I J

This patent describes a water-based clay drilling fluid containing from 0.25 lbs./bbl. to 6 lbs./bbl. of (A) sulfonate amide polymer 2, a water-soluble sulfonate amide copolymer, having a molecular weight of about 200,000 to 2 million and consisting of a random distribution of units of a formulae in a proportion of 60 wt.% to 80 wt.% of the weight of the copolymer, and a formulae in a proportion of 20 wt.% to 40 wt.% of the weight of the copolymer; and (B) 0.25 lbs./bbl. to 6 lbs./bbl. of an acrylate polymer of a formula wherein the acrylate polymer has a molecular weight less than 50,000, and wherein the weight ratio of the sulfonate amide copolymer to the acrylate polymer is about 3:1.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4626362
• OSTI ID: 6961936
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLATES
ADDITIVES
ALKYL RADICALS
AQUEOUS SOLUTIONS
CARBOXYLIC ACID SALTS
CONTROL
COPOLYMERS
DISPERSIONS
DRILLING FLUIDS
ELEMENTS
ETHYL RADICALS
FLUIDS
HYDROGEN
HYDROGEN COMPOUNDS
LOST CIRCULATION
METHYL RADICALS
MIXTURES
MOLECULAR WEIGHT
NATURAL GAS WELLS
NONMETALS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
QUANTITY RATIO
RADICALS
SOLUTIONS
SULFONATES
TEMPERATURE DEPENDENCE
WATER
WELLS