Process for altering the relative permeability if a...

Details Process for altering the relative permeability if a... Process for altering the relative permeability if a...

2006-08-01

2006-08-01

Robertson, Jeffrey B. (Department: 1712)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S221000, C507S224000, C507S225000, C507S235000, C507S238000

Reexamination Certificate

active

07084094

ABSTRACT:
A process for treating a hydrocarbon-bearing formation having at least one hydrocarbon bearing zone and at least one water bearing zone wherein the ratio of the permeability of the hydrocarbon bearing zone(s) to the permeability of the water bearing zone(s) is in the range of from 1:20 to 3:1 comprising: a) sequentially injecting into the formation: (i) an aqueous polymer solution comprising 0.01 to 0.5 weight percent of a water-soluble polymer having from 0.01 to 7.5 mole % of crosslinkable carboxylate and/or phosphonate groups and a molecular weight in the range of 250,000 to 12,000,000; and (ii) an aqueous solution of a crosslinking agent; and b) back-producing the aqueous polymer solution over the crosslinking agent so that the polymer crosslinks within the formation to form a gel which is collapsible to allow hydrocarbon flow.

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