Full-opening annulus pressure operated sampler valve with reverse circulation valve
US4063593A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1977 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Feb 16, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/0813
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A normally open oil well sampler valve which provides a fully open testing flow path therethrough is presented, wherein the sampler valve is closed under hydraulic control after a predetermined pressure increase in the well annulus pressure. The sampler includes two spaced apart ball valves having a sample chamber therebetween. The operating mechanism moves the ball valves from the open to the closed position simultaneously, and provides a hydraulic lock as well as a mechanical lock to prevent the balls from reopening in the well. The apparatus further includes a circulation valve which is opened after the closing of the sampler valve. One of the ball valves of the apparatus may be selectively removed to provide a single ball, safety closure valve when a well fluid sample is not desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.