Fracturing with telescoping members and sealing the annular...

E - Fixed Constructions – 21 – B

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E21B 43/10 (2006.01) E21B 33/14 (2006.01) E21B 43/112 (2006.01)

Patent

CA 2761583

A fracturing operation is done in open hole. The annular space is spanned by telescoping members that are located behind isolation valves. A given bank of telescoping members can be uncovered and the telescoping members extended to span the annular space and engage the formation in a sealing manner. Pressurized fracturing fluid can be pumped through the telescoped passages and the portion of the desired formation fractured. In a proper formation, cementing is not needed to maintain wellbore integrity. In formations that need annular space isolation, the string in a preferred embodiment can have an external material that grows to seal the annular space in lieu of a traditional cementing operation.

L'invention concerne une opération de fracturation dans un trou ouvert. L'espace annulaire est étendu au moyen d'éléments télescopiques disposés derrière des soupapes d'isolement. Un jeu donné d'éléments télescopiques peut être découvert et déployé pour étendre l'espace annulaire et venir en contact avec la formation de manière étanche. Un liquide de fracturation sous pression peut être pompé dans les passages télescopés et la partie requise de la formation, fracturée. Dans une formation convenable, il n'est pas nécessaire de cimenter. Dans le cas d'une formation nécessitant l'isolement de l'espace annuaire, la colonne peut, selon un mode de réalisation préféré, comporter un matériau extérieur qui vient étanchéifier l'espace annulaire sans recours à un cimentage classique.

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