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US 10,294,403 B2Granted
Additive of chemically-modified cellulose nanofibrils or cellulose nanocrystals
AssigneeHalliburton Energy Services, Inc.
InventorsLee J. Hall, Jay P. Deville, Orlando J. Rojas, Carlos A. Carrillo, Carlos L. Salas
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Abstract
A wellbore treatment fluid comprising: a base fluid; and additive comprising a first polymer bundle selected from the group consisting of cellulose nanofibrils, cellulose nanocrystals, and combinations thereof, wherein one or more functional groups of the first polymer are chemically modified A method of treating a portion of a wellbore comprising: introducing the treatment fluid into the wellbore.
Claims17
A method of treating a portion of a wellbore comprising:
- introducing a treatment fluid into the wellbore, the treatment fluid comprising:
- (A) a base fluid;
- and
- (B) an additive comprising a first polymer bundle consisting of cellulose nanofibrils;
- wherein one or more functional groups of the first polymer bundle are chemically modified;
- wherein the one or more functional groups comprise primary or secondary alcohols;
- wherein the chemical modification comprises grafting of a second polymer onto the first polymer bundle;
- wherein the second polymer is selected from the group consisting of cationic cellulose nanofibrils;
- substituted methyl cellulose;
- chitosan;
- chitin;
- quaternary amino groups, including cationic polyacrylamides, cationic starch, poly(diallyldimethyl ammonium chloride), or epichlorohydrin/dimethylamine polymers;
- nonionic or anionic polymers, including polyethylene glycol or lignins;
- and any combinations thereof.
11 more elements
A system comprising:
- a wellbore that penetrates a subterranean formation;
- and
- a treatment fluid comprising:
- (A) a base fluid;
- and
- (B) an additive comprising a first polymer bundle consisting of cellulose nanofibrils;
- wherein one or more functional groups of the first polymer bundle are chemically modified;
- wherein the one or more functional groups comprise primary or secondary alcohols;
- wherein the chemical modification comprises grafting of a second polymer onto the first polymer bundle;
- wherein the second polymer is selected from the group consisting a cationic cellulose nanofibrils;
- substituted methyl cellulose;
- chitosan;
- chitin;
- cationic polyelectrolytes containing primary, secondary, tertiary or quaternary amino groups, including cationic polyacrylamides, cationic starch, poly(diallyldimethyl ammonium chloride), or epichlorohydrin/dimethylamine polymers;
- nonionic or anionic polymers, including polyethylene glycol or lignins;
- and any combinations thereof.
13 more elements
Dependencies are inferred from the claim text.