Method for the separation of gas from oil.

摘要

Water-insoluble polyoxyalkylene graft copolymers are effective anti-foam agents for reducing foaming in crude oil/gas separators The copolymers are of formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="44" wi="79" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>
wherein R is an ethylene, propylene or butene group or a mixture thereof; R' is a hydrocarbyl group containing 1 to 8 carbon atoms; R" is a hydroxyl group, an alkoxy group or an alkyl group containing 1 to 8 carbon atoms;
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) is a number in the range 100 to 250;</ListItem><ListItem>(b) is a number in the range 1 to 6;</ListItem><ListItem>(c) is a number in the range 1 to 10: and</ListItem><ListItem>(d) is a number in the range 10 to 100.</ListItem></UnorderedLists>

They are particularly useful in breaking microgas dispersions and foams resulting from crude oils with a high gas to oil ratio.