Method for isolating multi-lateral well completions while...

E - Fixed Constructions – 21 – B

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E21B 7/06 (2006.01) E21B 23/03 (2006.01) E21B 29/06 (2006.01) E21B 41/00 (2006.01) E21B 43/14 (2006.01) E21B 47/00 (2012.01)

Patent

CA 2233086

In a cased wellbore (10) having one or more cased and cemented drainholes (24) extending therefrom such that the elliptical shaped opening (46) or junction of each drainhole (24) with the primary well (10) is sealed and cut flush with the inside of the primary well casing (18), an inventive method and system is disclosed for. (a) isolating each perforated and/or drainhole completion (108, 126) within the primary wellbore (10), (b) providing flow control means (162, 164) for each completion (108, 126) to permit selective testing, stimulation, production, or abandonment, and (c) facilitating selective re-entry into any cased drainhole (24) for conducting additional drilling, completion, or remedial work.

Dans un puits de forage (10) tubé présentant un ou plusieurs puits de drainage (24) tubés, fixés par cimentation et s'étendant à partir du puits initial de manière à ce que l'ouverture (46) de forme elliptique ou jonction de chaque puits de drainage (24) avec le puits (10) initial soit scellée et coupée affleurante avec l'intérieur du tubage (18) du puits initial, on a prévu un procédé et système inventifs destinés: (a) à isoler chaque complétion (108, 126) perforée et/ou puits de drainage dans le puits (10) de forage initial, (b) à monter des moyens (162, 164) de régulation du débit pour chaque complétion (108, 126) afin de permettre sélectivement un essai, une stimulation, une production ou un abandon, et (c) à faciliter une rentrée sélective dans tout puits de drainage (24) tubé, afin d'effectuer un forage, une complétion ou un ouvrage de protection additionnels.

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