US 11,787,993 B1
In-situ foamed gel for lost circulation
Ayman Raja Al-Nakhli, Dammam (SA); Wajdi Mohammed Buhaezah, Dammam (SA); Saleh A. Haidary, Dammam (SA); and Rami A. Sindi, Dammam (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Mar. 28, 2022, as Appl. No. 17/705,956.
Int. Cl. E21B 21/00 (2006.01); C09K 8/512 (2006.01); E21B 33/138 (2006.01); C09K 8/504 (2006.01)
CPC C09K 8/512 (2013.01) [C09K 8/5045 (2013.01); E21B 21/003 (2013.01); E21B 33/138 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of treating lost circulation, comprising:
providing a treatment fluid comprising a polymer and at least one nitrogen-generating compound comprising a nitrite-containing compound through a wellbore into a lost circulation zone in a subterranean formation, wherein the polymer comprises polyacrylamide homopolymer or polyacrylamide copolymer, or both;
generating nitrogen gas in the lost circulation zone by a reaction of the at least one nitrogen-generating compound, wherein the reaction is activated by a temperature of the subterranean formation or by an acid, or both;
generating foam from the nitrogen gas and the treatment fluid in the lost circulation zone to give foamed polymer in the lost circulation zone;
plugging the lost circulation zone with the foamed polymer; and
bonding the foamed polymer to rock in the lost circulation zone via an adsorption system comprising a silane, wherein the treatment fluid comprises the adsorption system.