Oil well testing valve with liquid spring
US4109724A · kind A · utility
29Cited by
10References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Oct 27, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S137/906
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A testing valve and its method of operation is disclosed for use in testing an oil well formation wherein the valve includes a liquid spring and operating means for operating the valve responsive to changes in the well annulus pressure. Volume adjusting mechanisms are also disclosed for compensation for a change in the volume of liquid as the valve is subjected to pressure and temperature gradients of the well as the tool is lowered in a well to testing depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.