Multiple stage cementing tool with inflation packer and methods of use
US3948322A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1975 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Apr 23, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cementing tool for providing multiple stage cementing of an oil well including a cylindrical outer case, a longitudinally sliding sleeve valve located therein, an inflatable packer assembly disposed about the outer case with annular check valve means interposed between the interior of the inflatable packer and passages communicating with the interior of the cementing tool. Annular sleeve valve means is interposed between the check valve means and the exterior of the tool and is releasable upon the application of a predetermined pressure differential across the sleeve valve means in response to the application of pressure to the interior of the tool to open the interior of the tool to the annulus between the tool and the oil well bore above the inflated packer. The inflatable packer assembly includes a relatively thin, tubular solid metallic membrane having physical properties allowing it to contain the inflatable pressure and to expand as the inflation pressure is applied to the interior of the packer. An annular resilient sealing member is formed on the exterior of the packer member to afford a fluid-tight seal between the inflated packer and the wall of the oil well bore. In on…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.