Cased hole perforating alternative
US7520335B2 · kind B2 · utility
18Cited by
20References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2004 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Jul 1, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Casing is scored but not penetrated in one embodiment of a method that allows access to the formation without perforating or section milling the casing. In the run in condition the casing is impervious, to allow cement to be pumped through it to seal the annular space between the casing and the wellbore. After the cement is delivered and displaced through a shoe, the casing is expanded in the regions where it was scored to create openings that go against the wellbore wall. In between the expanded sections the cemented casing offers isolation between adjacent formations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.