Environmentally safe well plugging composition
US5476543A · kind A · utility
17Cited by
8References
5Claims
0Family size
Inventor
Key dates
| Filing date | Jul 19, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Jul 19, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31844
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition for plugging wells that is biodegradable and environmentally safe comprising bentonite particles coated with a water soluble coating of biodegradable natural resin, such as certified three pound Confectioners White Lac Glaze in Specially Denatured Ethyl Alcohol (SDA) Formula 35A, 190 proof. The bentonite may be in the form of chips or compressed pellets. When exposed to water, the soluble coating dissolves at a uniform rate, exposing the bentonite to water whereupon it expands to form a tough but flexible water impermeable seal of a semi-solid, gel-like mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.