Method of plugging a well
US4275788A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1980 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Jan 28, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for forming a plug in a well bore by establishing a two-phase system within the well bore. The two-phase system includes a less dense phase which bears against the upper surface of a higher density phase to provide an interface between the two phases that is positioned at a desired location in the well-bore for formation of a plug. A hardenable plug material is injected at the interface between the two phases with the plug material having a density which is intermediate the densities of the less dense and more dense phases. The plug material is then permitted to harden to form a bond within the well bore. In the formation of the plug, the plug material floats on the more dense phase with the plug material being squeezed between the less dense and the higher density phases. Thus, the plug material is compressed and is also forced laterally into contact with the surface of the well bore to bond more securely to the well-bore surface during hardening of the plug material. The two-phase system within the well bore may be made up of a more dense liquid and a less dense liquid; the latter floats on the more dense liquid and an interface is formed between the two liquids. Also, t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.