Phosphonated polysaccharides and gels and process for making same

Patent metadata

Field	Value
Publication number	US-10239960-B2
Application number	US-201615179103-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Jun 10, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Products and processes that are related to phosphonated polysaccharide compositions, including phosphonated polysaccharide gels, having a substituent degree of substitution with a lower limit of 0.02 and an upper limit of 3, and having a weight average molecular weight with an upper limit of 5,000,000 g/mole, as well as to oil field application or fracturing fluid compositions comprising such phosphonated polysaccharide compositions.

First claim

What is claimed is:

1. A polysaccharide composition comprising at least one phosphonated guar or at least one phosphonated guar derivative, having a substituent degree of substitution with a lower limit of 0.05 and an upper limit of 3, and having a weight average molecular weight with an upper limit of 5,000,000 g/mole; wherein the composition is cross-linked with a metal cation to form a phosphonated polysaccharide gel, wherein the metal cation is selected from compounds of iron and wherein the binding energy is at least 40 kJ/mol.

2. The composition of claim 1 wherein the lower limit of the substituent degree of substitution is 0.055.

3. The composition of claim 1 wherein the lower limit of the substituent degree of substitution is 0.07.

4. The composition of claim 1 wherein the lower limit of the substituent degree of substitution is 0.9.

5. The composition of claim 1 wherein the lower limit of the substituent degree of substitution is 1.

6. The composition of claim 1 wherein the lower limit of the substituent degree of substitution is 1.5.

7. The composition of claim 1 wherein the at least one phosphonated guar derivative is a phosphonated hydroxypropyl guar.

8. The composition of claim 1 wherein the at least one phosphonated guar derivative is selected from phosphonated carboxymethyl guar (CMG); phosphonated hydroxyethyl guar (HEG); phosphonated hydroxypropyl guar (HPG); phosphonated carboxymethylhydroxypropyl guar (CMHPG); phosphonated hydrophobically modified guar (HM guar); phosphonated hydrophobically modified carboxymethyl guar (HMCM guar); phosphonated hydrophobically modified hydroxyethyl guar (HMHE guar); phosphonated hydrophobically modified hydroxypropyl guar (HMHP guar); phosphonated hydrophobically modified carboxymethylhydroxypropyl guar (HMCMHP guar); or any combination thereof.

9. The composition of claim 1 wherein the at least one phosphonated guar derivative is selected from phosphonated cationic carboxymethyl guar (CMG), phosphonated cationic hydroxyethyl guar (HEG), phosphonated cationic hydroxypropyl guar (HPG), phosphonated cationic carboxymethylhydroxypropyl guar (CMHPG), phosphonated cationic hydrophobically modified hydroxypropyl guar (cationic HMHP guar), phosphonated hydrophobically modified cationic guar (HM cationic guar) or any combination thereof.

10. The composition of claim 1 further comprising one or more biocides, one or more surfactants, one or more scale inhibitors, one or more stabilizers or any of the foregoing.

11. The composition of claim 1 wherein the weight average molecular weight has an upper limit of 3,000,000 g/mole.

12. The composition of claim 1 wherein the weight average molecular weight has an upper limit of 2,000,000 g/mole.

13. The composition of claim 1 wherein the weight average molecular weight has an upper limit of 950,000 g/mole.

14. The composition of claim 1 wherein the weight average molecular weight has an upper limit of 800,000 g/mole.

15. The composition of claim 1 wherein the weight average molecular weight has a lower limit of 50,000 g/mole.

16. A method of treating a subterranean formation, comprising:
providing an oilfield application fluid comprising the phosphonated polysaccharide composition of claim 1 ; and
introducing the oilfield application fluid into a wellbore penetrating the subterranean formation.

17. The method of claim 16 wherein the step of introducing the oilfield application fluid into the wellbore penetrating the subterranean formation comprises introducing the oilfield application fluid at a pressure sufficient to create, expand or sustain a fracture in the subterranean formation.

18. The method of claim 16 wherein the oilfield application fluid further comprises one or more surfactants, one or more scale inhibitors, one or more stabilizers or any combination of the foregoing.

Assignees

• Rhodia Operations

Inventors

• Timbart Laurianne
• Lizarraga Gilda
• Woodward Gary
• Kesavan Subramanian
• Wilson David James

Classifications

• C09K8/90 Primary

  of natural origin, e.g. polysaccharides, cellulose · CPC title

• C08B37/00 Primary

  Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof (cellulose D21; {microbiological processes C12P}) · CPC title

• C09K8/605

  containing biocides · CPC title

• C08B37/0096

  Guar, guar gum, guar flour, guaran, i.e. (beta-1,4) linked D-mannose units in the main chain branched with D-galactose units in (alpha-1,6), e.g. from Cyamopsis Tetragonolobus; Derivatives thereof · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title