Hydraulically actuated safety sub
US10858894B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2018 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Jan 24, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety joint having threads with a first handedness, for example right-handed threads, to connect the safety joint to an upper drill pipe portion and a lower drill pipe portion. The safety joint includes a releasable threaded connection having a second handedness inverse of the first handedness. The safety joint also includes a hydraulically actuated piston sleeve that locks rotation across the releasable threaded connection. Disconnecting the upper drill pipe portion from the lower drill pipe portion is achieved by moving the piston sleeve to a position wherein the piston sleeve does not transmit rotation across the releasable threaded connection, and rotating the upper drill pipe portion in the first handedness direction to unscrew the releasable threaded connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.