Synthetic polymer based fluid loss pill

Patent metadata

Field	Value
Publication number	US-10487258-B2
Application number	US-201615770470-A
Country	US
Kind code	B2
Filing date	Oct 28, 2016
Priority date	Oct 30, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

Compositions herein may include an aqueous fluid, a crosslinked polyvinylpyrrolidone (PVP), and a betaine based polymer. Methods herein may include pumping a selected amount of a fluid loss pill into a formation, the fluid loss pill including a crosslinked PVP and a betaine based polymer.

First claim

What is claimed:

1. A composition comprising:
an aqueous base fluid;
a crosslinked polyvinylpyrrolidone (PVP); and
a betaine based polymer, wherein the betaine based polymer is a copolymer of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium and polyacrylamide, and
wherein the betaine based polymer has a content of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium ranging from about 8% to about 12%.

2. The composition of claim 1 , wherein the aqueous base fluid is a halide brine.

3. The composition of claim 1 , wherein the aqueous base fluid is a formate brine.

4. The composition of claim 1 , wherein the crosslinked PVP is present in the composition at a concentration that ranges from about 0.5 lb/bbl (1.4 kg/m 3 ) to about 15 lb/bbl (42.7 kg/m 3 ).

5. The composition of claim 1 , wherein a ratio between the crosslinked PVP and the betaine based polymer is 12 to 10.

6. The composition of claim 1 , wherein the crosslinked PVP has a percentage of intermolecular crosslinking that ranges from 0.25% to 10%.

7. The composition of claim 1 , wherein the fluid loss pill is thermally stable to temperatures up to 400° F.

8. The composition of claim 1 , wherein the fluid loss pill is thermally stable for at least 7 days.

9. The composition of claim 1 , wherein the fluid loss pill has a density of about 13.5 ppg to about 16.5 ppg.

10. A method for reducing fluid loss, the method comprising:
pumping a selected amount of a fluid loss pill into a formation, the fluid loss pill comprising:
an aqueous base fluid;
a crosslinked polyvinylpyrrolidone (PVP); and
a betaine based polymer, wherein the betaine based polymer is a copolymer of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium and polyacrylamide, and

wherein the betaine based polymer has a content of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium ranging from about 8% to about 12%.

11. The method of claim 10 , wherein the aqueous base fluid comprises at least a brine selected from a group of halide brines.

12. The method of claim 10 , wherein the aqueous base fluid comprises at least a brine selected from a group of formate brines.

13. The method of claim 10 , wherein the crosslinked PVP is present in the fluid loss pill at a concentration that ranges from about 0.5 lb/bbl (1.4 kg/m 3 ) to about 15 lb/bbl (42.7 kg/m 3 ).

14. The method of claim 10 , wherein a ratio between the crosslinked PVP and the betaine based polymer is 12 to 10.

15. The method of claim 10 , wherein the crosslinked PVP has a percentage of intermolecular crosslinking that ranges from 0.25% to 10%.

16. The method of claim 10 , wherein the fluid loss pill is thermally stable to temperatures up to 400° F.

17. The method of claim 10 , wherein the fluid loss pill is thermally stable for at least 7 days.

18. The method of claim 10 , wherein the pill has a density of about 13.5 ppg to about 16.5 ppg.

19. A method for forming a fluid loss pill, the method comprising:
forming a pre-mix of a crosslinked polyvinylpyrrolidone (PVP) and a glycol;
mixing a desired amount of a first brine with the pre-mix;
adding a second brine; and
adding at least a betaine based polymer,
wherein the betaine based polymer is a copolymer of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium and polyacrylamide, and
wherein the betaine based polymer has a content of 2-(methacryloyoxy) ethyl) dimethyl-(3-sulfopropyl) ammonium ranging from about 8% to about 12%.

20. The method of claim 19 , wherein the pill has a density of about 13.5 ppg to about 16.5 ppg.

21. The method of claim 19 , wherein the crosslinked PVP has a percentage of intermolecular crosslinking that ranges from 0.25% to 10%.

22. The method of claim 19 , wherein the fluid loss pill is thermally stable to temperatures up to 400° F.

23. The method of claim 19 , wherein the fluid loss pill is thermally stable for at least 7 days.

Assignees

• Mi Llc

Inventors

• Panamarathupalayam Balakrishnan
• Toomes Richard

Classifications

• C08F220/585

  and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS] · CPC title

• C08L39/06

  Homopolymers or copolymers of N-vinyl-pyrrolidones · CPC title

• C09K8/5086 Primary

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08F26/10

  N-Vinyl-pyrrolidone · CPC title

• C09K8/12

  containing synthetic organic macromolecular compounds or their precursors · CPC title