| 摘要 |
<p>Water dispersible, hydrophilic, organic polymers having a molecular weight greater than 100,000 and containing carboxyl functionality, are cross-linked using a composition comprising water, a tetravalent zirconium compound, an alpha-hydroxy acid and an amine. By contacting subterranean formations with such cross-linked polymers, the permeability of the formations is reduced which, in the case of oil wells, improves secondary and tertiary oil recovery techniques.</p> |
