Particulate polyvinyl alcohol plugging agents
US11549046B2 · kind B2 · utility
0Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2021 |
| Grant date | Jan 10, 2023 |
| Priority date | — |
| Expiry date | Jan 28, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/261
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A particulate plugging agent, such as a diverting agent and/or loss circulation material, using a particular polyvinyl alcohol with a certain amount of monovalent metallic salt, which is water-soluble and has a buffer effect even if the environment is acidic, and thus stable, which in particular finds use in various subsurface oil production operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.