Patent ID: 7874363
Filing Date: 2011-01-25
Classification: C09K,E21B

Abstract:
1. A method for placing an aqueous polymer in the water conduits of the production zone of a gas or oil reservoir to form a barrier to shut off or reduce unwanted production of water, through a well-bore tubing and/or annulus of a well in communication with the production zone of the gas or oil reservoir, comprising: injecting water into the production zone to establish an injection rate into the production zone of at least 200 L/min., and injecting the aqueous polymer into the production zone at said injection rate, said aqueous polymer comprising phenolformaldehyde containing 1-2 weight % of at least one of sodium bisulphite, sodium metabisulphite and mixtures thereof additionally containing 10 weight % anhydrous sodium sulphate.