Polysaccharide lost circulation materials for wellbore operations

Patent metadata

Field	Value
Publication number	US-11427746-B2
Application number	US-201816500063-A
Country	US
Kind code	B2
Filing date	Nov 9, 2018
Priority date	Nov 9, 2018
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

Described herein are plugging materials with polysaccharides that can be used in wellbore operations. A plugging material can include hydraulic cement, amorphous silica, polysaccharides, a retarder, clay, and an aqueous base, where the material is injectable into a wellbore. The polysaccharides can be cross-linked with borate. The retarder can be at least one of an organo phosphoric acid, a modified sulfonated styrene-maleic anhydride polymer, lignosulfonate, or a polyacrylic acid.

First claim

What is claimed is:

1. A plugging material comprising:
hydraulic cement,
amorphous silica,
polysaccharides cross-linked with borate,
a retarder,
clay, and
an aqueous base, the material being injectable into a wellbore, wherein the polysaccharides cross-linked with borate break down at temperatures above 160° F. after injection into the wellbore to release freed borate that increases gel strength and thickening time of the hydraulic cement in the plugging material.

2. The material of claim 1 , wherein the polysaccharides are cross-linked.

3. The material of claim 1 , wherein the retarder comprises a modified sulfonated styrene-maleic anhydride polymer.

4. The material of claim 1 , further comprising at least one of a resin, a latex, a stabilizer, a pozzolan, a microsphere, an aqueous superabsorber, a viscosifying agent, a suspending agent, a dispersing agent, an extender, a salt, an accelerant, a surfactant, a stimulating agent, a defoamer, a settling-prevention agent, a weighting material, an elastomer, a vitrified shale, an expansion additive, a gas migration control additives a formation conditioning agent, an acid, or and a base.

5. The material of claim 1 , wherein the hydraulic cement comprises at least one of Portland cement, a pozzolana cement, a gypsum cement, a high alumina content cement, a slag cement, a high magnesia content cement, a shale cement, an acid or a base cement, a fly ash cement, a zeolite cement system, a kiln dust cement system, a microfine cement, a metakaolin, or a pumice.

6. The material of claim 1 , wherein the aqueous base comprises at least one of fresh water, brackish water, or saltwater.

7. The material of claim 1 , wherein the pH of the aqueous base is adjusted with sodium hydroxide.

8. The material of claim 1 , wherein the material has a density of less than about 12 pounds per gallon.

9. The material of claim 1 , wherein the thickening time to 70 Bc at 320° F. and 5000 psi is increased to at least two hours.

10. The material of claim 1 , wherein the material has a 10-second static gel strength of at least 6 lbf/100 ft 2 at 180° F., and a 10-minute static gel strength of at least 14 lbf/100 ft 2 at 180° F.

11. The material of claim 1 , wherein the material has a 10-second static gel strength of at least 15 lbf/100 ft 2 at 180° F., and a 10-minute static gel strength of at least 45 lbf/100 ft 2 at 180° F.

12. The material of claim 1 , wherein the material has an ultimate compressive strength over 100 psi at 340° F.

13. The material of claim 1 , wherein the material transitions from 100 lbf/100 ft 2 to 500 lbf/100 ft 2 in 30 minutes or less, at 320° F. and 5000 psi.

14. The material of claim 1 , wherein the polysaccharides are present in an amount of about 1 percent by weight of cement to about 10 percent by weight of cement.

15. The material of claim 1 , wherein the retarder is present in an amount of about 7 percent by weight of cement to about 15 percent by weight of cement.

16. The material of claim 1 , wherein the material is positionable in the wellbore to substantially seal one or more permeable zones in the wellbore, and prevent a loss of circulation of drilling fluids and cement slurries through the permeable zones.

17. A method comprising:
providing a material comprising hydraulic cement, amorphous silica, polysaccharides cross-linked with borate, a retarder, clay, and an aqueous base;
contacting a lost circulation zone in a wellbore with the material, and
allowing the material to set in the lost circulation zone, wherein the polysaccharides cross-linked with borate break down at temperatures above 160° F. after injection into the wellbore to release freed borate that increases gel strength and thickening time of the hydraulic cement in the material.

18. The method of claim 17 , wherein the retarder comprises a modified sulfonated styrene-maleic anhydride polymer.

19. The method of claim 17 , wherein the thickening time to 70 Bc at 320° F. and 5000 psi is increased to at least two hours.

20. The method of claim 17 , wherein the material has a 10-second static gel strength of at least 6 lbf/100 ft 2 at 180° F., and a 10-minute static gel strength of at least 14 lbf/100 ft 2 at 180° F.

Assignees

• Halliburton Energy Services Inc

Inventors

• Sen Tamal Kumar
• Patil Sandip Prabhakar
• Singh Sheetal

Classifications

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B14/10

  Clay {(sepiolite C04B14/042; grog C04B18/025)} · CPC title

• C09K8/426 Primary

  for plugging · CPC title

• C04B24/38

  Polysaccharides or derivatives thereof {(C04B24/243 takes precedence)} · CPC title

• C04B2103/20

  Retarders · CPC title