Flexible grout composition and method
US4886550A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Oct 3, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/70
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A flexible grout composition is used to cement a conduit within a bore hole to prevent fluid loss, for sealing and grouting well casings, plugging abandoned wells, and waterproofing earthen structures. The flexible grout composition consists essentially of water, a water-swellable clay, such as bentonite; optionally a particulate filler; and a dispersing agent for the water-swellable clay, such as sodium acid pyrophosphate (SAPP). The grout composition is mixed with water to form a slurry and the slurry is pumped into its intended location, for example, within the annulus defined between an outer surface of a conduit or casing disposed within a bore hole, and the surrounding earthen formation formed, for example, by drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.