Biodegradable foaming agent in drilling and workover operations

Details Biodegradable foaming agent in drilling and workover operations Biodegradable foaming agent in drilling and workover operations

C - Chemistry, Metallurgy

09

K

31/14

C09K 8/38 (2006.01) C09K 8/52 (2006.01) E21B 21/14 (2006.01)

Patent

CA 1093806

"Abstract of the Disclosure" A method for conducting foam drilling and workover operations in a bore hole penetrating a subterranean reservoir employing an aqueous solution of a biodegradable foaming agent composition containing about 0.1 to 1 part by weight of an N-fatty ethyl sulfate salt having the formula: H O R-N-CH2-CH2-O-S-OM O wherein R is a straight chain alkyl radical having from 10 to 16 carbon atoms and M is an alkali metal or ammonium cation, per part per weight of a fatty acid salt having the formula: O R1-C-OM1 wherein R1 is a straight chain alkyl radical having from 9 to 15 carbon atoms and M1 is an alkali metal or ammonium cation. A particularly preferred foaming agent composition contains sodium 2-(N-lauryl) ethyl sulfate and sodium laurate.

306919

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