Method and apparatus for completing and backside pressure testing of wells
US5979553A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | May 1, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | May 1, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2934
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for completing and backside pressure testing petroleum product wells for production, with one or more differential pressure valves being present at spaced intervals within a tubing string and with a well fluid transfer device being located in the tubing string. Either after or preferably before well casing perforation, after setting of the tubing string, casing pressure is elevated to a backside test pressure, above differential pressure causing closure of the differential pressure responsive valves to ensure the integrity of seals and packers. Casing pressure is then increased to a transfer valve opening pressure, above backside test pressure, to open unidirectional flow communication of well fluid from the well casing to the production tubing. After the casing annulus has been unloaded of standing fluid to a desired level and with all regulating valves closed by differential pressure or has been balanced with formation pressure, the casing is perforated for immediate start up of well fluid production by formation pressure or other suitable production operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.