Safety slip ram
US6543546B2 · kind B2 · utility
10Cited by
12References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2002 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Jun 13, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pair of ram blocks are provided such that when they are actuated hydraulically to move together, they present an opening which has a series of gripping members downwardly biased. Removal of tubulars or tools from the well bore works against the bias to retract the grippers so that removal can be accomplished. However, if there is an accidental release, the bias pushes the grippers toward the tubular or tool to grip it to prevent loss into the well bore. The ram blocks can be retracted for run-in to the well bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.