Junction isolation apparatus and methods for use in multilateral well treatment operations
US6712148B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Jun 4, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/27
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Specially designed apparatus is utilized to provide convenient isolation of a wellbore junction from pressure and corrosion during an acid fracturing stimulation process performed in a main or branch wellbore portion downhole from the junction. The apparatus has an outer tubular portion which may be installed, in a single trip into the main wellbore, in a straddling and sealing relationship with the junction, and an inner tubular structure sealingly and removably received within the outer tubular structure. Fracturing acid may be pumped directly down the main wellbore, and then to the formation to be stimulated, via the interior of the outer tubular structure, after the removal of the inner tubular structure subsequent to its use in facilitating a downhole pressure test of a lower end seal portion of the outer tubular structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.