Auxiliary workover rig
US4684306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1984 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Jul 23, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An auxiliary rig is used in combination with a primary drilling or workover rig. The primary drilling rig typically includes an elongated upstanding drill tower, a base and a crown block. The auxiliary rig of the present invention includes a racking tower detachably mounted with the upper end of the drill tower to form an extension to the drill tower for receiving interconnected pairs of tubular members to reduce the tripping time of the tubular members into and out of the well. A movable slip and controller therefor of the auxiliary rig are operably guided by the racking tower for releasably supporting the pairs of tubular members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.