CPC C09K 8/512 (2013.01) [C09K 8/5045 (2013.01); E21B 21/003 (2013.01); E21B 33/138 (2013.01)] | 22 Claims |
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.
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