Wellbore mechanism for liquid and gas discharge
US6637510B2 · kind B2 · utility
57Cited by
15References
3Claims
0Family size
Inventor
Key dates
| Filing date | Nov 12, 2001 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Nov 12, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wellbore pump comprises a plunger having a passage which may be open or closed by a valve operated by a piston which is biased in the open position by a spring of selected strength such that the wellbore pressure may overcome the spring to close the valve when the accumulated hydrostatic pressure reaches a certain value. When the valve closes the reservoir pressure forces the plunger to the surface and causes the accumulated liquids to be pumped out of the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.