Chemical injection system for downhole treating
US5117913A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Sep 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S166/902
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A chemical injection assembly and apparatus for treating production fluids in a bore-hole. The system includes a fixed packer having an opening passing therethrough for receiving a production tubing string, a closable orifice in the packer that is actuated by the tubing string and appropriate seals for preventing fluid transfer within the packer. When the tubing string is inserted into the packer, a collar on the tubing string engages a shiftable sleeve that places an orifice in the shifting sleeve in alignment with the orifice in the injection sleeve so that chemical treatment fluid from the surface can be forced down the bore-hole casing through the closable orifice in the packer and into the production fluid at the perforations near the producing formations. The treated fluids then enter the tail pipe of the packer and up the tubing string to the surface. When it is desired to plug the well, a plug is inserted into the tail pipe and the tubing string is withdrawn. As the tubing string is withdrawn, the collar on the tubing string engages a collar on the shiftable sleeve moving it to a second position where it blocks the orifice in the injection sleeve thus preventing any transfe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.