Method for plugging wellbores with polycarboxylic acid shear thickening composition
US4542791A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1984 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | Nov 16, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/502
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for plugging a porous formation in a well bore which comprises pumping a shear-thickening composition into drill pipe in the well under conditions of low shear to the point desired to be plugged at which point the composition is forced through the orifices of a drill bit at the end of the drill pipe and subjected to high shear of at least about 1,000 sec..sup.-1 which forms a paste in the well bore which plugs the porous formation. The shear-thickening composition comprises a water-in-oil emulsion having granular bentonite dispersed in the continuous oily phase, wherein the oily phase has a polyamine derivative surfactant dissolved therein, and the aqueous phase comprises an aqueous solution of a polyacrylamide and a polycarboxylic acid. This process may be used for plugging wells having depths in excess of 8,000 feet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.