Stage tool for wellbore cementing
US9121255B2 · kind B2 · utility
32Cited by
39References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2010 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Mar 27, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stage tool for wellbore annular cementing may be opened for cementing by hydraulic actuation of a sliding sleeve valve from over a fluid port. After sufficient cement has been introduced, the stage tool fluid port can be closed by compressing two telescopically arranged parts of its tubular body to further overlap each other and overlie the fluid port. This permits the stage tool to be closed without employing a plug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.