Pivot gun having charges which slidingly engage a stationary detonating cord and apparatus for deploying the charges
US5095801A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1991 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Mar 8, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/118
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pivot gun through-tubing perforating apparatus, which is adapted to be lowered through a tubing in a borehole, includes a perforating gun section and a deployment head section. The perforating gun section includes a plurality of charges which rotate or pivot about an axis during deployment, and a stationary detonating cord. When each charge rotates during deployment, a top of each charge slidingly engages with a stationary detonating cord. The deployment head includes a first explosive bolt, a second explosive bolt, and a piston having a contact finger which is adapted to contact either one of three switch contacts. When the contact finger contacts a first and second switch contact, the first explosive bolt is connected to a voltage source and each of the charges are short circuited to ground potential. In this condition, the charges cannot detonate, and, when the first explosive bolt detonates, the charges begin to deploy in response to movement of the piston. When the contact finger moves from the first and second switch contact to a third switch contact, the short circuit to the charges is removed, and the charges are reconnected to the voltage source. In addition, the second …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.