| 摘要 |
An aqueous gellable composition having a delayed gelling time is disclosed, which contains a water-soluble polymer crosslinkable with Cr<3><+> and a crosslinking/retardant system containing a Cr<3><+> ion and a salicylic acid ligand, wherein said ligand can be in free form, or in the form of a complex with Cr<3><+>, or partially in free form and partially in complexed form. Such a composition is useful for modifying the permeability in petroleum reservoirs, within a wide range of temperatures, of from about 60 DEG C to 120 DEG C, or higher temperatures. |
