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EP0167361A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for the separation of gas from oil

Assignee: BP PLC
•
Filing: 1985-06-27
•
Granted: —
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Expires: 2005-06-27
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Abstract

Abstract Water-insoluble polyoxyalkylene graft copolymers are effective anti-foam agents for reducing foaming in crude oil/gas separators The copolymers are of formula: 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; (a) is a number in the range 100 to 250; (b) is a number in the range 1 to 6; (c) is a number in the range 1 to 10: and (d) is a number in the range 10 to 100. They are particularly useful in breaking microgas dispersions and foams resulting from crude oils with a high gas to oil ratio.

Inventors

  • 👤 Ian Charles Callaghan
  • 👤 Clive Martin Gould
  • 👤 Wogciech Grabowski

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 15:59
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 120 words
A method for separating crude oil containing associated gas into liquid oil and free gas in the presence of an anti-foam agent characterised by the fact that the anti-foam agent is a water-insoluble polysiloxane polyoxyalkylene graft copolymer 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; (a) is a number in the range 100 to 250; (b) is a number in the range 1 to 6; (c) is a number in the range 1 to 10; and (d) is a number in the range 10 to 100.
Claim 2
Independent Claim 120 words
A method for separating crude oil containing associated gas into liquid oil and free gas in the presence of an anti-foam agent characterised by the fact that the anti-foam agent is a water-insoluble polysiloxane polyoxyalkylene graft copolymer 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; (a) is a number in the range 100 to 250; (b) is a number in the range 1 to 6; (c) is a number in the range 1 to 10; and (d) is a number in the range 10 to 100.
Claim 3
Dependent Claim 20 words
A method according to claim 1 wherein the ratio of (a) to (d) is in the range 2:1 to 15:1.
Claim 4
Independent Claim 15 words
A method according to either of the preceding claims wherein R is an ethylene group.
Claim 5
Independent Claim 15 words
A method according to any of the preceding claims wherein R' is a methyl group.
Claim 6
Independent Claim 15 words
A method accordir.g to any of the preceding claims wherein R" is a hydroxyl group.
Claim 7
Dependent Claim 22 words
A method according to claim 5 wherein the ratio of silicon atoms to hydroxyl groups is in the range 2:1 to 16:1.
Claim 8
Independent Claim 23 words
A method according to any of the preceding claims wherein the siloxane content of the copolymer is in the range 30-70% by weight.
Claim 9
Independent Claim 27 words
A method according to any of the preceding claims wherein the copolymer is present in amount 0.1 to 20 ppm expressed on the basis of active ingredient.
Claim 10
Dependent Claim 18 words
A degassed crude oil containing a polysiloxane polyoxyalkylene graft copolymer as defined in any of the preceding claims.

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