Actuation method
US4878053A · kind A · utility
4Cited by
45References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Apr 14, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface valve-actuator combination for well production tubing is described. The valve is urged to closed position but held open by a battery-operated latch of the actuator. A receiver-relay in the battery-actuator circuit maintains a switch closed to permit the latch to be energized as long as the receiver-relay receives an electromagnetic signal transmitted from the earth's surface. The latch is deenergized upon interruption of the signal and/or if the battery power is insufficient to energize the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.