Shock absorber for use in a wellbore including a frangible breakup element preventing shock absorption before shattering allowing shock absorption after shattering
US5366013A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | May 5, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/1195
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shock absorber, adapted to be disposed above a perforating gun in a tool string and adapted to be disposed in a wellbore, includes a crushable element disposed between an inner and outer housing, a frangible breakup element, and a detonating cord disposed within the frangible breakup element and connected to the perforating gun. In operation, a detonation wave propagates within the detonating cord on its way toward the perforating gun. However, before the detonation wave reaches the perforating gun, the detonation wave propagates through the frangible breakup element. In response to the passage of the detonation wave through the frangible breakup element, the frangible element shatters into a multitude of pieces. Before the frangible element shatters, the frangible element absolutely prevents any shock from being absorbed by the shock absorber of the present invention. As a result, preloading effects are avoided. However, after the frangible element shatters, the shock absorber of the present invention is ready to absorb the shock resultant from the detonation of the perforating gun. After the frangible element shatters, in response to the detonation wave passing therethrough, th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.