Actuator assembly and method for actuating downhole assembly
US6659200B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2000 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Oct 4, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An actuator assembly is a valveless, high pressure, positive displacement, axial drive system including a hydraulic fluid reservoir and a hydraulic enclosure in an actuator housing with a bi-directional pump assembly driven by an electric motor and a piston assembly disposed within the hydraulic enclosure. The bi-directional pump accurately displacing the piston a given distance to exert a large drive or actuation force and to maximize that actuation force given a limited electrical current transmitted to the motor. Because the pump is bi-directional, the piston can be repositioned after actuation by reversing the direction of flow through the pump without using valves to direct the hydraulic fluid flow. The actuator assembly may also include a piston repositioning assembly connected to the hydraulic enclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.