Encapsulated internal filter cake breakers with improved release properties
US10273398B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 31, 2014 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Jan 8, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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 a metal crosslinked acrylic polymer. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.