Guided drilling system with shock absorber
US5778987A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1996 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Apr 29, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is provided a guided drilling system and an in-the-hole shock absorber adapted thereto. The guided drilling system includes a drill string configured to continuously and accurately bore a hole in the ground without the need to periodically break the connection of the drill string. In order to protect the components of the drilling system a hollow core shock absorber for percussive drill strings has been designed. A centrally disposed coil spring transmits the necessary thrust to a percussive hammer while providing a resilient cushion for vibration displacement. Pressurized fluid flows through the center of the shock absorber through a poppet valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.