Rotary control device with self-contained hydraulic reservoir
US11686173B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2021 |
| Grant date | Jun 27, 2023 |
| Priority date | — |
| Expiry date | Jul 10, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/0021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved rotating control device, having a spool and removable bearing assembly, provides a self-contained hydraulic reservoir that can be operated with standard air pressures from an air hose or other readily available source, eliminating traditional surface hydraulic power units (HPUs). Hydraulically operated pistons can be spring biased to close latching elements around the bearing assembly. Hydraulic fluid can be forced from the self-contained hydraulic reservoir through flow paths to hydraulic cylinders to force the pistons to retract radially outward to release the bearing assembly for removal. The bearing assembly can include a lubricant reservoir to supply gravity-fed or pressurized lubrication for internal roller bearings. The bearing assembly can further include a rotary seal in several embodiments that efficiently reduces risks of dropping bolts on personnel and in the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.