Defoamer and antifoamer composition and method for defoaming aqueous fluid systems

Patent · Mon Dec 22 23:00:00 EST 1986

OSTI ID:6986289

Zychal, C

This patent describes a defoamer and antifoamer composition for use in aqueous fluid systems used in the drilling and maintenance of oil and gas wells consisting essentially of (1) a high-boiling mixture comprising ethers, alcohols, esters and aldehydes containing at least 40 wt % components having from 6 to 12 carbon atoms and (2) a fatty acid ester. The high-boiling mixture is present in an amount within the range of about 50 wt % to about 90 wt % and the fatty acid ester is present in an amount within the range of about 10 wt % to about 50 wt %. A method is described for defoaming an aqueous fluid system used in the drilling and maintenance of oil and gas wells and preventing the formation of foam in the system. The method comprises adding to the system an effective defoaming and antifoaming amount of a composition consisting essentially of (1) a high-boiling mixture comprising ethers, alcohols, esters and aldehydes and (2) a fatty acid ester. The high-boiling mixture is present in an amount within the range of about 50 wt % to about 90 wt % of the fatty acid ester being present in an amount within the range of about 10 wt % to about 50 wt %.

• Assignee: Amoco Corp., Chicago, IL
• Patent Number(s): US 4631145
• OSTI ID: 6986289
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ADDITIVES
ALCOHOLS
ALDEHYDES
AQUEOUS SOLUTIONS
BOILING POINTS
CARBON
CARBOXYLIC ACID ESTERS
COLLOIDS
DISPERSIONS
DRILLING
DRILLING FLUIDS
ELEMENTS
ESTERS
ETHERS
FLUIDS
FOAMS
HYDROXY COMPOUNDS
MAINTENANCE
MIXTURES
NATURAL GAS WELLS
NONMETALS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WELL DRILLING
WELLS