Method and apparatus for the completion of an oil or gas well and the like
US4718496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1987 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Jan 5, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/117
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for isolating a formation, isolating a damaged section of casing, and for pressure testing the apparatus when located in a cased well bore. The apparatus includes a first packer that is in sealing engagement with the casing for isolating the formation, second and third packers that are spaced to span the damage to the casing, a first valve for closing the passageway through the packers, and a second valve for applying pressure between the first and second packers to test the seals formed thereby. Also provided is an improved method for isolating a damaged section of casing, isolating a formation, and pressure testing the apparatus when located in a cased well bore. The method includes extending the aforementioned apparatus into the well bore, closing the first valve to close the flow through the packers, opening a second valve, and applying pressure to test the seals of the first and second packers. The method also includes the step of applying pressure down an annulus formed between a conduit upon which the apparatus is suspended and the casing to test the seal of the upper packer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.