Wiper device for stripping drilling fluid from rig drill string
US6155358A · kind A · utility
Inventor
Key dates
| Filing date | Oct 22, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Oct 22, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The wiper device comprises an elongated conveyor arm which can pivot in a horizontal plane and freely move forward and backward through a limited travel (which movement capabilities are collectively termed "floating" capability). The arm carries a wiper pad assembly on its outer end. The wiper pad assembly can therefore float with the arm to accommodate lateral and to and fro sway of the drill string within the confines of the rig rotary table bushing, when the wiper pads are engaged with the drill string. The arm can be advanced and withdrawn to convey the wiper pad assembly between the operative stripping position over the bushing and a retracted position off to one side of the bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.