Anti-accretion additives for wellbore fluids and methods of use thereof

Patent metadata

Field	Value
Publication number	US-10253238-B2
Application number	US-201615349605-A
Country	US
Kind code	B2
Filing date	Nov 11, 2016
Priority date	Nov 13, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Accretion inhibiting wellbore fluid compositions a ay contain a multiester, a sorbitan ester surfactant, and a base fluid, wherein the composition is in the form of a metastable emulsion. Methods may include emplacing a wellbore fluid into a wellbore, the wellbore fluid containing a multiester, and a sorbitan ester surfactant, wherein the wellbore fluid forms a metastable emulsion.

First claim

What is claimed is:

1. A wellbore fluid composition comprising:
a multiester,
a sorbitan ester surfactant, and
a base fluid;
wherein the composition is in the form of a metastable emulsion and a total concentration of the sorbitan ester surfactant and the multiester ranges from 2.5 to 40 ppb.

2. The wellbore fluid composition of claim 1 , wherein the metastable emulsion separates within a time selected from the range of 5 minutes to 1 hour after mixing the multiester, the sorbitan ester surfactant, and the oleaginous solvent components with the base fluid.

3. The wellbore fluid composition of claim 1 , further comprising an oleaginous solvent.

4. The wellbore fluid composition of claim 3 , wherein the ratio of sorbitan ester:multiester:oleaginous solvent surfactant ranges from 1:3:3 to 1:5:5.

5. The wellbore fluid composition of claim 3 , wherein the HLB of the oleaginous solvent is in the range of 2 to 5.

6. The wellbore fluid composition of claim 1 , wherein the concentration of the multiester is in the range of 0.5 v % to 3 v %.

7. The wellbore fluid composition of claim 1 , wherein the multiester has a HLB within a range of 7 to 11.

8. The wellbore fluid composition of claim 1 , wherein the base fluid is an aqueous fluid.

9. The wellbore fluid composition of claim 1 , wherein the base fluid is an oleaginous fluid.

10. The wellbore fluid composition of claim 1 , wherein the HLB of the sorbitan ester surfactant is in the range of 7 to 9.5, or in the range of 12.5 to 20.

11. The wellbore fluid composition of claim 1 , wherein the total concentration of sorbitan ester surfactant and multiester combined ranges from about 5 to 30 ppb.

12. A method comprising:
emplacing a wellbore fluid into a wellbore, the wellbore fluid comprising:
a multiester, and
a sorbitan ester surfactant,
wherein the wellbore fluid forms a metastable emulsion and a total concentration of the sorbitan ester surfactant and the multiester ranges from 2.5 to 40 ppb.

13. The method of claim 12 , wherein the wellbore fluid further comprises an oleaginous solvent.

14. The method of claim 13 , wherein the ratio of sorbitan ester:multiester:oleaginous solvent surfactant ranges from 1:3:3 to 1:5:5.

15. The method of claim 13 , wherein the HLB of the oleaginous solvent is in the range of 2 to 5.

16. The method of claim 12 , further comprising combining the wellbore fluid with an aqueous base fluid prior to emplacement in the wellbore.

17. The method of claim 12 , further comprising combining the wellbore fluid with an aqueous base fluid present in the wellbore.

18. The method of claim 12 , wherein the metastable emulsion separates within a time selected from the range of 5 minutes to 1 hour after mixing the multiester, the sorbitan ester surfactant, and the oleaginous solvent components with a base fluid.

19. The method of claim 12 , wherein the HLB of the sorbitan ester surfactant is in the range of 7 to 9.5, or in the range of 12.5 to 20.

20. The method of claim 12 , wherein the total concentration of sorbitan ester surfactant and multiester combined may be in the range of 5 to 30 ppb.

Assignees

• Mi Llc
• Schlumberger Norge As

Inventors

• Cliffe Stephen
• Grinrod Anders

Classifications

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title

• C09K8/52 Primary

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

• C09K2208/12

  Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title