Method and apparatus for removing fluid from production tubing into the well
US5782305A · kind A · utility
63Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Nov 18, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1632
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and apparatus are provided for draining or removing well fluid from a production tubing string into a well borehole while pulling the tubing string from the well. A special length of tubing is provided near the lower end of the tubing string with a drain port communicating the interior and exterior of the tubing. The drain port is initially plugged and sealed with a knock out plug. When it is desired to remove the tubing string from the well and drain its fluid into the borehole, a drop sleeve is dropped from the surface to shear and open the knock out plug. A sleeve stop catches the drop sleeve for re-use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.