| 摘要 |
<p>Process for modifying the permeability of rock formations through the injection of a gellable solution, characterized in that the gellable aqueous solution comprises: 1) water, 2) a water-soluble polymer having a molecular weight of from 100,000 to 1,000,000 selected from: - a polyacrylamide as such or a partly hydrolysed polyacrylamide, - acrylamide copolymers with other monomers which can be copolymerized with acrylamide, 3) a crosslinking composition essentially comprising at least one phenol derivative and at least one aldehyde.</p> |
