| 摘要 |
A method and composition for treating subterranean formation by reducing formation permeability by injecting into the formation through a well bore, a first polymer solution including a polymer selected from the group consisting of poly(vinylalcohol-co-vinylcarboxyl), <IMAGE> I poly(vinylalcohol-co-vinylether), <IMAGE> II wherein: R is H, alkyl, alkyl sulfonate or aryl groups having not more than 10 carbon atoms; X is NR2, OH, OR, O-, alkylammonium, or alkylsulfonate; and a, b, and c are mole fractions of each co-monomer unit such that a+b+c=1, a>0, and b>0, which is crosslinked with an ion selected from the group consisting of multivalent transition metals of the Group IIIa-VIa, VII, and Ib-Vb of the Periodic Table.
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