| 摘要 |
In a cased wellbore having one or more cased and cemented drainholes extending therefrom such that the elliptical shaped opening or junction of each drainhole with the primary well is sealed and cut flush with the inside of the primary well casing, an inventive method is disclosed for: (a) isolating each perforated and/or drainhole completion within the primary wellbore, (b) providing flow control means for each completion to permit selective testing, stimulation, production, or abandonment, and (c) facilitating selective re-entry into any cased drainhole for conducting additional drilling, completion, or remedial work. In a preferred embodiment, a production liner is permanently attached within the primary well casing such that packers straddle permanent flow control devices and precut liner windows which are positioned adjacent to perforated completions and drainhole entrance openings, respectively. Orientation key slots built into internal seal bore/latch down profile collars positioned below each precut window are used in conjunction with a novel wireline conveyed video camera tool to properly align the base of each precut liner window to the bottom of each elliptical shaped drainhole opening. |
