Subsurface well apparatus and method
US4284141A · kind A · utility
5Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1973 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jun 11, 1993 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Subsurface well apparatus and method of operating same, wherein a controlled ball valve or closure means is provided, with means for mounting same in a well tubing for normally opening and closing flow through the well tubing, and wherein a fluid flow control assembly having a replacement ball valve therewith is adapted to be dropped in or otherwise lowered through the well tubing so as to position same above said controlled ball valve for subsequent operation of said replacement valve to thereafter serve as a replacement for said controlled valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.