Encapsulated enzyme breaker and method for use in treating subterranean formations
US5604186A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Feb 15, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/922
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method of preparing an encapsulated enzyme breaker and method of use in treating a subterranean formation. An encapsulated breaker is prepared by coating an enzyme on a cellulose substrate. A micron-sized particulate is admixed with the enzyme solution to prevent undesired agglomeration of the substrate. The enzyme solution coated substrate is covered with a membrane comprising a partially hydrolyzed acrylic crosslinked with either an aziridine prepolymer or a carbodiimide. The membrane contains imperfections through which an aqueous fluid may pass into the breaker to contact the enzyme and diffuse the enzyme outward from the breaker particle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.