Patent ID: 11945996
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 9:
10. A method of water shutoff, comprising:
injecting a treatment fluid comprising a polymer, crosslinker, and a nitrogen-generating compound comprising a nitrite-containing compound through a wellbore into a water zone in a subterranean formation;
providing an acid to the water zone;
reacting the nitrite-containing compound in the water zone to give nitrogen gas in the water zone, the reaction being activated by the acid;
generating foam in the water zone via the nitrogen gas giving the polymer as foamed polymer in the water zone; and
sealing the water zone with the foamed polymer, wherein sealing the water zone comprises the foamed polymer restricting water flow from the water zone into the wellbore.