Drilling rig mast lift systems and methods
US8875911B2 · kind B2 · utility
3Cited by
20References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2010 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Dec 15, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B15/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Systems and methods for rig assembly and for erecting a mast of a rig and such systems with roller apparatus to facilitate movement of a mast section from a mover. In a first embodiment, the method includes erecting a rig mast section on a substructure, the substructure including a first substructure box spaced-apart from a second substructure box, the first substructure box comprising a first upper box above a first lower box and the second substructure box comprising a second upper box above a second lower box.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.