Aqueous gellable composition, useful for modifying the...

Details Aqueous gellable composition, useful for modifying the... Aqueous gellable composition, useful for modifying the...

E - Fixed Constructions

21

B

E21B 33/138 (2006.01) C09K 8/512 (2006.01) C09K 8/88 (2006.01)

Patent

CA 2063876

An aqueous gellable composition having a delayed gelling time is disclosed, which contains a water-soluble polymer crosslinkable with Cr3+ and a crosslinking and gel- retarding system containing a Cr3+ ion and a salicylic acid ligand, wherein said ligand can be in free form, or in the form of a complex with Cr3+, or partially in free form and partially in complexed from. Such a composition is useful for modifying the permeability in petroleum reservoirs, within a wide range of temperatures, of from about 60°C to 120°C, or higher temperatures.

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