Internal breaker

Details Internal breaker Internal breaker

2004-11-17

2008-09-23

Moore, Margaret G (Department: 1796)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C507S111000, C507S112000, C507S120000, C507S140000

Reexamination Certificate

active

07427582

ABSTRACT:
A wellbore fluid including a peroxide degradable polymer and an encapsulated peroxide source. The peroxide degradable polymer may be a polysaccharide. The peroxide source may include an inorganic peroxide, including zinc and alkaline earth metal peroxides, such as magnesium peroxide. The encapsulating material may be a polymer, including enteric polymers. The release of peroxide, from peroxide sources generally, can be controlled by means of pH such that peroxide source can be activated, and peroxide released, by a change in pH. In a wellbore, this pH change can be effected by using produced fluids to lower the pH of a more basic wellbore fluid.

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