Casing exit joint with easily milled, low density barrier
US7726401B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2008 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | May 21, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/0035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A casing exit joint with an easily milled and low density barrier. A casing exit joint for use in drilling a lateral wellbore outwardly from a parent wellbore includes a generally tubular window structure having a window formed through a sidewall of the structure. An outer sleeve is disposed external to the window structure, so that the sleeve overlies the window. A hardenable substance supports the sleeve against deflection toward the window. A method of drilling a lateral wellbore extending outwardly from a parent wellbore includes the steps of: providing a casing exit joint including a hardenable substance positioned in a sidewall of the casing exit joint; then installing the casing exit joint in the parent wellbore; and then cutting through the hardenable substance in order to provide access for drilling the lateral wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.