Pressure-operated oil and gas well swabbing device
US4986727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1988 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jul 20, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B9/1256
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An oil well swabbing device having a pressure activated valve for use in closing a fluid passage therein when the swabbing device is submerged under liquid in a well casing corresponding to a predetermined valve closing pressure; the pressure-activated valve comprising a pressure collapsible bladder such as a bellows or diaphragm, a valve and seat interposed in the fluid passage, and an actuator rod connecting the valve to the pressure collapsible bladder such that the valve is closed when the bladder is collapsed to a degree corresponding to the predetermined valve closing pressure. Improved speed brakes, catchers, and position indicators for oil well swabbing devices are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.