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

1977-10-17

1978-10-24

Novosad, Stephen J.

Wells

Processes

Producing foam or gas in well by foaming or gas producing...

175 66, 175 69, 252 85C, E21B 2100, C09K 702, C09K 708

Patent

active

041216644

ABSTRACT:
A method for conducting foam drilling and workover oprations 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: ##STR1## 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: ##STR2## wherein R.sub.1 is a straight chain alkyl radical having from 9 to 15 carbon atoms and M.sub.1 is an alkali metal or ammonium cation. A particularly preferred foaming agent composition contains sodium 2-(N-lauryl) ethyl sulfate and sodium laurate.

REFERENCES:
patent: 2870990 (1959-01-01), Bergey
patent: 3174929 (1965-03-01), Andersen
patent: 3229777 (1966-01-01), Rogers
patent: 3269468 (1966-08-01), Phansalkar et al.
patent: 3394768 (1968-07-01), Chocola
patent: 3486560 (1969-12-01), Hutchison et al.
patent: 3529668 (1970-09-01), Bernard
patent: 3995705 (1976-12-01), Fischer et al.
patent: 4036764 (1977-07-01), Fischer et al.
Swisher, "The Chemistry of Surfactant Biodegradation", The Journal of the American Oil Chemists' Society, vol. 40, Nov., 1963, pp. 648-656.

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