Composition including functionalized polysaccharide for treatment of subterranean formations

1. A method of treating a subterranean formation, comprising:

placing in a subterranean formation a composition comprising a functionalized polysaccharide comprising:

a hydroxy(C 1 -C 5 )alkyl functionalization;

a polyhydroxy(C 2 -C 5 )alkyl functionalization; and

wherein:

the hydroxy(C 1 -C 5 )alkyl functionalization is an HE functionalization having the structure R 1 —O—CH 2 —CH 2 —;

the polyhydroxy(C 2 -C 5 )alkyl functionalization is a DHP functionalization having the structure R 2 —O—CH 2 —CH(OR 3 )—CH 2 —;

at each occurrence, R 1 and R 2 are each independently selected from the group consisting of R 5 —O—CH 2 —CH 2 — and R 6 —O—CH 2 —CH(OR 7 )—CH 2 —;

at each occurrence, R 3 is independently selected from the group consisting of —H, R 5 —O—CH 2 —CH 2 —, and R 6 —O—CH 7 —CH(OR 7 )—CH 2 —; and

at each occurrence, R 5 , R 6 , and R 7 are each independently selected from the group consisting of —H, H—O—CH 2 —CH 2 —, and H—O—CH 2 —CH(OH)—CH 2 —.

2. The method of claim 1 , wherein as compared to a corresponding composition that is free of the functionalized polysaccharide, the composition comprising the functionalized polysaccharide experiences lower friction.

3. The method of claim 1 , wherein at a loading of about 10 pounds of the functionalized polysaccharide per thousand gallons at a flow rate of about 20 gallons per minute, as compared to a corresponding composition that is free of the functionalized polysaccharide, the composition comprising the functionalized polysaccharide provides about 50% to about 100% greater friction reduction.

4. The method of claim 1 , further comprising:

fracturing the subterranean formation with the composition comprising the functionalized polysaccharide and a proppant to form a fracture; and

depositing the proppant into the fracture.

5. The method of claim 1 , further comprising fracturing the subterranean formation with the composition comprising the functionalized polysaccharide.

6. The method of claim 1 , wherein an average number of the hydroxy(C 1 -C 5 )alkyl functionalizations per saccharide monomer of the functionalized polysaccharide is about 0.01 to about 10.

7. The method of claim 1 , wherein an average number of the polyhydroxy(C 2 -C 5 )alkyl functionalization per saccharide monomer of the functionalized polysaccharide is about 0.1 to about 10.

8. The method of claim 1 , wherein:

at each occurrence, R 5 and R 6 are each independently selected from the group consisting of H—O—CH 2 —CH 2 — and H—O—CH 2 —CH(OH)—CH 2 —.

9. The method of claim 1 , wherein the functionalized polysaccharide is a functionalized linear cellulose.

10. The method of claim 1 , wherein at each occurrence, R 5 and R 6 are each H—O—CH 2 —CH 2 — and R 7 is —H.

11. The method of claim 10 , wherein at each occurrence, R 3 is —H.

12. The method of claim 1 , wherein at each occurrence, R 5 and R 6 are each H—O—CH 2 —CH(OH)—CH 2 — and R 7 is —H.

13. The method of claim 12 , wherein at each occurrence, R 3 is —H.

14. A method of treating a subterranean formation, the method comprising:

placing in a subterranean formation a composition comprising a proppant and a functionalized linear cellulose comprising:

a hydroxyethyl functionalization;

a dihydroxypropyl functionalization; and

wherein:

an average number of the hydroxyethyl functionalizations per saccharide monomer of the cellulose is about 1.5 to about 3;

an average number of the dihydroxypropyl functionalizations per saccharide monomer of the cellulose is about 0.1 to about 1;

the hydroxy(C 1 -C 5 )alkyl functionalization is an HE functionalization having the structure R 1 —O—CH 2 —CH 2 —;

the polyhydroxy(C 2 -C 5 )alkyl functionalization is a DHP functionalization having the structure R 2 —O—CH 2 —CH(OR 3 )—CH 2 —;

at each occurrence, R 1 and R 2 are each independently selected from the group consisting of R 5 —O—CH 2 —CH 2 — and R 6 —O—CH 2 —CH(OR 7 )—CH 2 —;

at each occurrence, R 3 is independently selected from the group consisting of —H, R 5 —O—CH 2 —CH 2 —, and R 6 —O—CH 2 —CH(OR 7 )—CH 2 —; and

at each occurrence, R 5 , R 6 , and R 7 are each independently selected from the group consisting of —H, H—O—CH 2 —CH 2 —, and H—O—CH 2 —CH(OH)—CH 2 —;

fracturing, the subterranean formation with the composition to form a fracture; and

depositing the proppant into the fracture.

15. The method of claim 14 , wherein at each occurrence, R 5 and R 6 are each H—O—CH 2 —CH 2 — and R 7 is —H.

16. The method of claim 15 , wherein at each occurrence, R 3 is —H.

17. The method of claim 14 , wherein at each occurrence, R 5 and R 6 are each H—O—CH 2 —CH(OH)—CH 2 — and R 7 is —H.

18. The method of claim 17 , wherein at each occurrence, R 3 is —H.

19. A system comprising:

a tubular disposed in a subterranean formation; and

a pump configured to pump a composition comprising a functionalized polysaccharide in the subterranean formation through the tubular, wherein the composition comprising the functionalized polysaccharide comprises:

a hydroxy(C 1 -C 5 )alkyl functionalization;

a polyhydroxy(C 2 -C 5 )alkyl functionalization; and

wherein:

the hydroxy(C 1 -C 5 )alkyl functionalization is an HE functionalization having the structure R 1 —O—CH 2 —CH 2 —;

the polyhydroxy(C 2 -C 5 )alkyl functionalization is a DHP functionalization having the structure R 2 —O—CH 2 —CH(OR 3 )—CH 2 —;

at each occurrence, R 1 and R 2 are each independently selected from the group consisting of R 5 —O—CH 2 —CH 2 — and R 6 —O—CH 2 —CH(OR 7 )—CH 2 —;

at each occurrence, R 3 is independently selected from the group consisting of —H, R 5 —O—CH 2 —CH 2 —, and R 6 —O—CH 2 —CH(OR 7 )—CH 2 —; and

at each occurrence, R 5 , R 6 and R 7 are each independently selected from the group consisting of —H, H—O—CH 2 —CH 2 —, and H—O—CH 2 —CH(OH)—CH 2 —.

20. The system of claim 19 , wherein the composition further comprises a proppant.