Emplacement of filter packs and seals for groundwater monitoring
US5078212A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1990 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Sep 6, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for emplacement of dry particulate filter pack and seal material into a borehole to form a monitoring zone for groundwater monitoring which allows the material to be emplaced in dry form. The method involves inserting a tube into the borehole to a depth above a desired monitoring zone and consecutively injecting a first layer of seal material, a layer of filter material and a second layer of seal material, while supplying gas to the tube to prevent groundwater from contacting particulate material while in the tube. The apparatus comprises an injector, including a container and valve assembly adapted for connection to a pressurized gas supply, that allows sequential placement of seal material and filter material while continuously supplying gas to the injection tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.