Vertically adjustable pipe racking apparatus
US3978993A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1975 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Jun 24, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/155
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A multi-stage, well-drilling mast assembly, particularly adapted to mobile drilling platforms, such as drilling vessels, the assembly having a main stage mast and an auxiliary mast, both pivoted to the platform for swinging movements between horizontal and vertical positions. The main stage carries well pipe hoisting equipment, and the auxiliary stage carries rack equipment for vertically storing well pipe, and racker equipment for moving the well pipe between the rack and the center line of the mast assembly. The racker equipment includes an upper racker arm and a lower racker arm, the lower racker arm being vertically adjustable and having a vertically moveable head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.