Oxidative breakers in a silicone based suspension

Patent metadata

Field	Value
Publication number	US-10696887-B2
Application number	US-201715595878-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	Mar 14, 2013
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An oxidative breaker system for use in reducing the viscosity of a polysaccharide-based or derivatized polysaccharide-based suspension includes a silicone carrier fluid, an oxidizer, and a suspension aid. The suspension aid is preferably fumed silica. The oxidizer may be selected from the group consisting of alkali metal peroxide, transition metal peroxide, persulfate compound, bromide compound, and bromate compound. In highly preferred embodiments, the oxidizer is magnesium peroxide or calcium peroxide. Alternative carrier fluids and suspension agents are also included in the art. Also disclosed is a method for breaking a polysaccharide-based suspension with the inventive oxidative breaker system.

First claim

It is claimed:

1. A method for reducing the viscosity of a polysaccharide-based fluid in a downhole environment, the method comprising the steps:
providing an oxidative breaker system, wherein the step of providing the oxidative breaker system comprises the step of mixing an oxidizer with a suspension aid in a silicone carrier fluid, wherein the silicone carrier fluid comprises a blend of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane with high molecular weight cross-linked polydimethylsiloxane and octamethylcyclotetrasiloxane;
placing the oxidative breaker system in contact with the polysaccharide-based fluid; and
oxidizing the polysaccharide-based fluid with the oxidative breaker system to reduce the viscosity of the polysaccharide-based fluid.

2. The method of claim 1 , wherein the suspension aid comprises fumed silica.

3. A method for reducing the viscosity of a polysaccharide-based fluid in a downhole environment, the method comprising the steps:
providing an oxidative breaker system, wherein the step of providing the oxidative breaker system comprises the step of mixing an oxidizer with a suspension aid in a silicone carrier fluid, wherein the silicone carrier fluid comprises about 80% blend of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane; and about 20% blend of high molecular weight cross-linked polydimethylsiloxane and octamethylcyclotetrasiloxane;
placing the oxidative breaker system in contact with the polysaccharide-based fluid; and
oxidizing the polysaccharide-based fluid with the oxidative breaker system to reduce the viscosity of the polysaccharide-based fluid.

4. The method of claim 3 , wherein the suspension aid comprises fumed silica.

5. A method for reducing the viscosity of a polysaccharide-based fluid in a downhole environment, the method comprising the steps:
providing an oxidative breaker system, wherein the step of providing the oxidative breaker system comprises the step of mixing an oxidizer with a suspension aid in a silicone carrier fluid, wherein the silicone carrier fluid comprises a cross-linked silicone fluid and the suspension aid comprises fumed silica;
placing the oxidative breaker system in contact with the polysaccharide-based fluid; and
oxidizing the polysaccharide-based fluid with the oxidative breaker system to reduce the viscosity of the polysaccharide-based fluid.

6. The method of claim 5 , wherein the silicone carrier fluid comprises: about 80% by weight mixture of cyclotetrasiloxane and cyclopentasiloxane; and about 20% by weight mixture of high molecular weight silicone elastomers in cyclopentasiloxane.

7. The method of claim 5 , wherein the silicone carrier fluid comprises a polydimethylsiloxane-polyoxypropylene copolymer.

Assignees

• Flotek Chemistry Llc

Inventors

• Dismuke Keith Ingram
• Philpot David
• Hill Randal M
• Pennypacker Rondell
• Hill Steven
• Sifferman Thomas R

Classifications

• C09K8/524

  organic depositions, e.g. paraffins or asphaltenes · CPC title

• C09K8/58

  Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids · CPC title

• C09K8/03 Primary

  Specific additives for general use in well-drilling compositions · CPC title

• C09K2208/26

  Gel breakers other than bacteria or enzymes · CPC title