Activators for inorganic oxide breakers

Patent metadata

Field	Value
Publication number	US-10563115-B2
Application number	US-201515551238-A
Country	US
Kind code	B2
Filing date	May 5, 2015
Priority date	May 5, 2015
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

Of the methods provided herein, is a method comprising: providing a treatment fluid comprising an aqueous base fluid, an inorganic oxidizer and an activator selected from the group consisting of N-acyl caprolactam based activators, substitutes benzoyl caprolactam based activators and mixtures thereof are provided; and preparing the treatment fluid for use in a down-hole operation, where the down-hole operation is either a gel breaking operation or a formation conditioning operation.

First claim

What is claimed is:

1. A method comprising:
providing a treatment fluid comprising:
an aqueous base fluid;
an oxidizing agent selected from the group consisting of peroxides, persalts, persulfates, perborates, percarbonates, perphosphates, hypochlorite salts, and combinations thereof; and
an activator selected from the group consisting of N-acyl caprolactam based activators substitutes benzoyl caprolactam based activators and combinations thereof;

introducing the treatment fluid into a treatment zone of a subterranean formation to remove contaminants from at least a portion of the treatment zone to form a cleaned out portion of the subterranean formation;
providing a gelling fluid comprising a continuous aqueous phase and gravel, wherein the continuous phase comprises: an aqueous base fluid and a gel component; and
introducing the gelling fluid into the treatment zone, wherein the treatment fluid is introduced to break the gel component of the gelling fluid.

2. The method of claim 1 ,
wherein introducing the gelling fluid into the treatment zone is prior to the step of introducing the treatment fluid.

3. The method of claim 1 , wherein the oxidizing agent is encapsulated prior to introducing the oxidizing agent into the treatment zone of the well for use in the down-hole operation.

4. The method of claim 1 , wherein the activator is encapsulated prior to introducing the activator into the treatment zone of the well for use in the down-hole operation.

5. The method of claim 1 , further comprising a foamed treatment fluid comprising a foaming agent and a gas.

6. The method of claim 1 , wherein the N-acyl caprolactam activators are selected from the group consisting of benzoyl caprolactam, formyl caprolactam, acetyl caprolactam, octanoyl caprolactam, propanoyl caprolactam, butanoyl caprolactam, nonanoyl caprolactam, pentanoyl caprolactam, decanoyl caprolactam, undecanoyl caprolactam, 3,5,5-tri-methylhexanoyl caprolactam, propinoyl caprolactam, hexanoyl caprolactam, and combinations thereof.

7. The method of claim 1 , wherein the substituted benzoyl caprolactam activators are selected from the group consisting of methylbenzoyl caprolactam, ethylbenzoyl caprolactam, ethoxybenzoyl caprolactam, propylbenzoyl caprolactam, propoxybenzoyl caprolactam, isopropylbenzoyl caprolactam, isopropoxybenzoyl caprolactam, butylbenzoyl caprolactam, butoxybenzoyl caprolactam, tert-butylbenzoyl caprolactam, tert-butoxybenzoyl caprolactam, pentylbenzoyl caprolactam, pentoxybenzoyl caprolactam, hexylbenzoyl caprolactam, hexoxybenzoyl caprolactam, 2,4,6-trichlorobenzoyl caprolactam, pentafluorobenzoyl caprolactam, dichlorobenzoyl caprolactam, dimethoxybenzoyl caprolactam, 4-nitrobenzoyl caprolactam, 3-chlorobenzoyl caprolactam, 4-chlorobenzoyl caprolactam 2,4-dichlorobenzoyl caprolactam, terephthaloyl dicaprolactum, and combinations thereof.

8. The method of claim 1 , wherein the oxidizing agent compound is present in the treatment fluid in an amount in the range of from about 0.1% to about 10% wt/vol.

9. The method of claim 1 , wherein the activator is present in the treatment fluid in an amount of from about 0.001% to about 20% wt/vol.

10. The method of claim 1 wherein the N-acyl caprolactam based activator is a N-acyl caprolactam derivative represented by the formula:

wherein R 1 is H, an alkyl, aryl, alkaryl, or alkoxyaryl group containing from 1 to 12 carbons; and wherein the substituted benzoyl caprolactam based activator is a substituted benzoyl caprolactam derivative having the formula:

where R 1 , R 2 , R 3 , R 4 , and R 5 contain from 1 to 12 carbon atoms and are members selected from the group consisting of H, halogen, alkyl, alkoxy, alkoxyaryl, alkaryl, alkaryloxy, and substituents having the structure:

wherein R 6 is selected from the group consisting of H, alkyl, alkaryl, alkoxy, alkoxyaryl, alkaryloxy, and aminoalkyl; X is O, NH, or NR 7 , wherein R 7 is H or a C 1 -C 4 alkyl group; and R 8 is an alkyl, cycloalkyl, or aryl group containing from 3 to 11 carbon atoms; provided that at least one R substituent is not H.

11. The method of claim 1 , wherein subsequent to the step of removing contaminates from at least a portion of the treatment zone to form a cleaned portion of the subterranean formation, the method further comprises:
providing a consolidation agent; and
introducing the consolidation agent to at least a portion of the cleaned portion of the treatment zone such that the consolidation agent adheres to at least a plurality of unconsolidated particulates in the cleaned portion of the treatment zone.

12. The method according to claim 1 , wherein the treatment zone where the down-hole operation is located has a temperature less than about 80° C.

13. The method according to claim 1 , wherein the treatment zone where the down-hole operation is located has a temperature less than about 60° C.

14. The method according to claim 1 , wherein the treatment fluid is introduced into the well using one or more pumps.

15. The method according to claim 1 , wherein the components of the treatment fluid are mixed using a blender system.

16. The method according to claim 1 , wherein the continuous aqueous phase has a viscosity from 10 cP to 75 cP.

17. A method comprising:
providing a treatment fluid comprising:
an aqueous base fluid;
an oxidizing agent selected from the group consisting of peroxides, persalts, persulfates, perborates, percarbonates, perphosphates, hypochlorite salts, and combinations thereof; and
an activator selected from the group consisting of N-acyl caprolactam based activators substitutes benzoyl caprolactam based activators and combinations thereof, and
wherein the oxidizing agent and activator are encapsulated prior to introducing the oxidizing agent and activator into a treatment zone of a subterranean formation;

introducing the treatment fluid into the subterranean formation to remove contaminates from at least a portion of the treatment zone to form a cleaned portion of the subterranean formation;
providing a gelling fluid comprising a continuous aqueous phase and gravel, wherein the continuous phase comprises: an aqueous base fluid and a gel component; and
introducing the gelling fluid into the treatment zone, wherein the treatment fluid is introduced to break the gel component of the gelling fluid.

Assignees

• Halliburton Energy Services Inc

Inventors

• Salla Rajender
• Pravesh Jag

Classifications

• C09K8/504

  Compositions based on water or polar solvents (C09K8/502 takes precedence) · CPC title

• E21B21/003

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

• C09K8/57 Primary

  Compositions based on water or polar solvents (C09K8/565 takes precedence) · CPC title

• C09K8/516

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• C09K8/518

  Foams · CPC title