Shock attenuating apparatus and method
US5117911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus attenuates a shock, such as an impact load from an explosion, by undergoing plastic deformation and by serially dissipating energy from a plurality of surfaces. In a particular embodiment, the plastic deformation and serial energy dissipation occur in and from a hollow unitary body having a cylindrical wall in which are defined a plurality of longitudinally spaced circumferential grooves. A method of attenuating shock from an explosion in an oil gas well comprises: lowering into the well an explosive connected to a shock attenuating member; detonating the explosive whereby an impact load with a shock wave is generated; and collapsing without severing the member in response to the impact load and dissipating energy of the shock wave from a plurality of surfaces of the member so that the shock wave is attenuated along the member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.