| 摘要 |
In a wellbore having at least one lateral or branch wellbore extending therefrom, a selective re-entry tool is presented for running on a completion string to enable an operator to select the branch desired so as to enter such desired branch with a coil tubing workstring (or the like) and perform an appropriate operation (e.g., stimulation, fracture, cleanout, shifting, etc.). In a preferred embodiment, the selective re-entry tool includes an outer stationary sub and an inner longitudinally shiftable mandrel or sleeve. Preferably, this sleeve is connected to a rectangular box which is spaced from an exit sub having a pair of exit openings. A flapper is pivotally connected at the intersection between the exit opening to the box by a pair of rails or pivot pins. Laterally extending ears on opposed sides of the flapper are received in a respective pair of elongated ramped guide slots formed on opposed lateral surfaces of the box. During operation, a known shifting tool will shift the inner sleeve upwardly or downwardly causing the box to similarly move (with respect to the outer sub). Longitudinal movement of the box will cause the ears on the flapper to move along the guide slots whereby the flapper will pivot between a first position which guides a coiled tubing through one of the exit openings to a second position which guides the coiled tubing through the other exit opening.
|
