Methods and compositions related to gelled layers in oil and/or gas wells

Patent metadata

Field	Value
Publication number	US-10294757-B2
Application number	US-201514811133-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Jul 28, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

Methods and compositions for the prevention of the formation, breakdown, and/or removal of gelled layers in an oil and/or gas well are provided. In some embodiments, the compositions and methods comprise a concentrate, as described in more detail herein, where the concentrate comprises two or more surfactants. In certain embodiments, the compositions and methods comprise an emulsion or a microemulsion. The emulsion or microemulsion may include a surfactant, optionally a solvent, and optionally a freezing point depression agent or other components.

First claim

What is claimed is:

1. A method for breaking down and/or removing a gelled layer in an oil and/or gas well having a wellbore, comprising:
injecting a concentrate comprising surfactant, wherein the surfactant comprises and alkoxylated polimine;
forming the gelled layer in the presence of an acid and an acid corrosion inhibitor, wherein the acid corrosion inhibitor comprises propargyl alcohol; and
breaking down and/or removing the gelled layer.

2. The method according to claim 1 , wherein the concentrate is combined with a first type of dilution fluid prior to and/or during the injecting step to form a concentrate solution.

3. The method according to claim 2 , wherein the concentrate is combined with a second type of dilution fluid prior to and/or during the injecting step to form a concentrate solution.

4. The method according to claim 2 , wherein the first type of dilution fluid comprises a freezing point depression agent.

5. The method according to claim 4 , wherein the freezing point depression agent is present in the concentrate solution in an amount between 0 wt % and about 80 wt % versus the total concentrate solution.

6. The method according to claim 3 , wherein the first and/or second type of dilution fluid comprises a base.

7. The method according to claim 6 , wherein the base is present in the first and/or second type of dilution fluid in an amount between about 1 wt % and about 60 wt % versus the first and/or second type of dilution fluid composition.

8. The method according to claim 3 , wherein the first and/or second type of dilution fluid comprises an aqueous phase.

9. The method according to claim 8 , wherein the aqueous phase comprises water.

10. The method according to claim 8 , wherein the aqueous phase is present in the first and/or second type of dilution fluid in an amount between about 1 wt % and about 90 wt % versus the first and/or second type of dilution fluid composition.

11. The method according to claim 2 , wherein the step of combining addition of the concentrate to the first type of dilution fluid form an emulsion or a microemulsion.

12. The method according to claim 3 , wherein the first and/or second type of dilution fluid comprises an acid corrosion inhibitor.

13. The method according to claim 12 , wherein the acid corrosion inhibitor is present in the first and/or second type of dilution fluid in an amount between about 0 wt % and about 10 wt % versus the first and/or second type of dilution fluid composition.

Assignees

• Flotek Chemistry Llc

Inventors

• Fursdon-Welsh Angus
• Silas James
• Smith-Gonzalez Monica

Classifications

• E21B37/06 Primary

  using chemical means for preventing or limiting {, e.g. eliminating,} the deposition of paraffins or like substances · CPC title

• C09K8/52

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

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K8/74

  combined with additives added for specific purposes · CPC title

• C09K8/602

  containing surfactants · CPC title