Wellhead hydraulic drive unit
US6854515B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 31, 2002 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Jan 13, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a wellhead hydraulic drive unit to operate various styles of downhole pumps, which is installed as an integral part of a wellhead thereby eliminating the need for a stuffing box. The wellhead hydraulic drive unit comprises a hollow hydraulic cylinder having a piston positioned therein, a hydraulic fluid supply attached to the hydraulic cylinder for raising the piston within the hydraulic cylinder, a hollow ram slideably received within the inner wall of the hydraulic cylinder and connected to the piston for reciprocation in response to the piston; and a production tube inserted through the ram for enabling well fluid to be discharged from the well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.