Isolation packer and methods of cementing from a floating vessel
US4286658A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1978 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Nov 8, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/146
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The extended length isolation packer of the present invention comprises upper and lower tubular body assemblies which are interconnected by a middle body. The upper tubular body assembly has an upper packer assembly and a closing positioner attached to its outer surface. The lower tubular body assembly has a lower packer assembly attached to its outer surface. An upper inner mandrel is concentrically disposed within said upper tubular body assembly and has a port disposed therein for communicating an inner cavity of said upper inner mandrel with the annular cavity between the isolation packer and an oil well casing. A lower inner mandrel is concentrically disposed within said lower tubular body assembly and communicates with said upper inner mandrel through said middle body. A fluid bypass is provided through annular cavities between the inner mandrels and the tubular body assemblies. The extended length provided by the lower tubular body assembly effectively doubles the distance between upper and lower packer assemblies providing for much greater allowable error in positioning the isolation packer within an oil well casing. Additionally, attached to a drill string, with the extend…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.