Coil tubing cleanout fluid

Patent metadata

Field	Value
Publication number	US-11060011-B2
Application number	US-201616320774-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Aug 24, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Coil tubing cleanout fluids comprising a clay are provided. A method may comprise introducing a cleanout fluid into a wellbore wherein the cleanout fluid comprises a carrier fluid and a clay; and entraining solid particles in the cleanout fluid wherein the solid particles are disposed in the wellbore.

First claim

What is claimed is:

1. A method comprising:
introducing a cleanout fluid into a wellbore through a coil tubing wherein the cleanout fluid comprises a carrier fluid and a clay;
contacting the cleanout fluid with a screened-out zone in the wellbore, the screened-out zone comprising a mass of solid particles which fully block the wellbore;
entraining at least a portion of solid particles from the mass of solid particles in the cleanout fluid, and
flowing the entrained solid particles from the wellbore through an annulus defined by a region of space between an inner diameter of the wellbore and an outer diameter of the coil tubing.

2. The method of claim 1 wherein the clay comprises a smectite clay.

3. The method of claim 1 wherein the clay comprises a hectorite clay.

4. The method of claim 1 wherein the clay is present in an amount of about 0.1% to about 2% by weight of the cleanout fluid.

5. The method of claim 1 wherein the cleanout fluid further comprises a gelling agent selected from the group consisting of guar gum, hydroxyl propyl guar, carboxymethyl hydroxypropyl guar, carboxymethyl cellulose, hydroxyethyl cellulose, and combinations thereof.

6. The method of claim 1 wherein the cleanout fluid has a viscosity of at least 100 cP.

7. The method of claim 1 wherein the cleanout fluid is further introduced into the wellbore through the annulus.

8. The method of claim 1 further comprising returning the cleanout fluid with the entrained solid particles to a wellhead.

9. The method of claim 8 further comprising removing the entrained solid particles from the cleanout fluid after the step of returning the cleanout fluid to the wellhead.

10. A method comprising:
providing a cleanout fluid comprising:
a carrier fluid;
hectorite clay; and
carboxymethyl cellulose;

introducing the cleanout fluid into a wellbore through a coil tubing;
contacting the cleanout fluid with a screened-out zone in the wellbore, the screened-out zone comprising a mass of solid particles which fully block the wellbore;
entraining at least a portion of the solid particles from the mass of solid particles in the cleanout fluid; and
flowing the cleanout fluid with the entrained solid particles out of the wellbore through an annulus defined by a region of space between an inner diameter of the wellbore and an outer diameter of the coil tubing.

11. The method of claim 10 wherein the carrier fluid is an aqueous carrier fluid.

12. The method of claim 10 wherein the carrier fluid is an oil based carrier fluid.

13. The method of claim 10 wherein the hectorite clay is present in an amount of about 0.1% to about 2% by weight of the cleanout fluid.

14. The method of claim 10 wherein the cleanout fluid further comprises a crosslinking agent.

15. The method of claim 10 wherein the cleanout fluid has a viscosity of at least 100 cP.

16. The method of claim 10 wherein the wellbore has a temperature of greater than 150° F.

17. The method of claim 10 further comprising removing the entrained solid particles from the cleanout fluid after flowing the cleanout fluid with the entrained solid particles out of the wellbore.

18. The method of claim 17 further comprising returning the cleanout fluid to the wellbore through the coil tubing.

Assignees

• Halliburton Energy Services Inc

Inventors

• Singh Dipti
• Sanders Michael Wayne

Classifications

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/52 Primary

  Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning · CPC title

• E21B37/00

  Methods or apparatus for cleaning boreholes or wells (E21B21/00 takes precedence) · CPC title