Solenoid operated safety valve and submersible pump system
US4798247A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Jul 15, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/128
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A power supply and control arrangement for a submersible pump and solenoid operated safety valve system. A surface control unit is connected to a downhole control unit by a three conductor cable. A single phase 400 Hz signal from the surface unit is rectified downhole and operates the solenoid to open the safety valve but is too high a frequency to affect the pump motor. A downhole detector senses full open condition of the safety valve and sends a signal to the surface where it is received by a monitor. The monitor interrupts the 400 Hz signal and applies a three phase 60 Hz signal to all three conductors of the cable to operate the pump motor and be rectified downhole to hold the solenoid and safety valve open. Loss of the valve open signal by the monitor interrupts the 60 Hz signal and disables the system until it is reset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.