COPOLYMER SURFACTANTS FOR USE IN DOWNHOLE FLUIDS

摘要

Various embodiments disclosed relate to hydroxy-terminated poly(alkylene oxide) copolymer surfactants for use downhole, downhole compositions including the same, and methods of using the same. In various embodiments, the present invention provides a method of treating a subterranean formation. The method can include obtaining or providing a composition including a hydroxy-terminated poly(alkylene oxide) copolymer surfactant. The copolymer surfactant can include a first repeating unit having the structure —[R1O]—, wherein at each occurrence R1 is independently a substituted or unsubstituted (C2-C10)alkylene group. The copolymer surfactant can include a second repeating unit having the structure —[R2O]—, wherein at each occurrence R2 is independently a substituted or unsubstituted (C2-C10)alkylene group. The first repeating unit can have a lower molecular weight than the second repeating unit. The first repeating unit and the second repeating unit can have a random copolymer or block copolymer arrangement in the copolymer surfactant. The method can also include placing the composition in a subterranean formation downhole.

主权项

1. A method of treating a subterranean formation, the method comprising:
obtaining or providing a composition comprising a hydroxy-terminated poly(alkylene oxide) copolymer surfactant comprising
a first repeating unit having the structure —[R1O]—, wherein at each occurrence R1 is independently a substituted or unsubstituted (C2-C10)alkylene group; anda second repeating unit having the structure —[R2O]—, wherein at each occurrence R2 is independently a substituted or unsubstituted (C2-C10)alkylene group;wherein the first repeating unit has a lower molecular weight than the second repeating unit, the first repeating unit and the second repeating unit have a random copolymer or block copolymer arrangement in the copolymer surfactant, and at least one of
a) the copolymer surfactant has a Davies HLB value of at least about 15, andb) the copolymer surfactant has a molecular weight of about 2,000 to about 25,000 and a total weight of the first repeating units is about 10 wt % to about 95 wt % of the copolymer surfactant; and placing the composition in a subterranean formation downhole.