Casing perforator
US4165784A · kind A · utility
Inventor
Key dates
| Filing date | Sep 26, 1977 |
| Grant date | Aug 28, 1979 |
| Priority date | — |
| Expiry date | Sep 26, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/112
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention involves a tool for connection to a conventional drill string and operation therewith for punching holes in a standard casing located within a well bore to pass water or gas therethrough for recovery at the well bore surface, the invention involving a pivotally arranged blade that can be extended by air, water, or mud that has passed through the drill string to impinge on a trigger end of that blade, a point end thereof engaging the casing wall whereafter, by forcing the drill string and tool downwardly, the blade pointed end will puncture the casing, removal of the blade from the casing wall involving only ceasing passing of air or fluid against the blade trigger and lifting of the drill string and connected tool. The tool also involves a backup arrangement for connection to the tool body to increase the diameter thereof to allow the tool to be used in a number of different sizes of casings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.