Method of isolating open perforations in horizontal...

E - Fixed Constructions – 21 – B

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E21B 33/134 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2625753

An improved method for building a plug in a horizontal wellbore using a fluid pill pumped into the wellbore at the end of a fracturing treatment. The fluid pill includes a high concentration of an ultra lightweight proppant, such as a neutrally buoyant proppant or an ultra lightweight proppant mixture. The fluid pill is pumped down the wellbore until it almost reaches fractures within a zone of interest. The pumping is then ceased or reduced, allowing the fractures to partially close. The ultra lightweight proppant remains suspended within the fluid pill while stationary. The pumping is then resumed at a very slow rate or as a short pump burst, thus causing the proppant in the fluid pill to bridge off until a bridge plug is formed.

Une méthode améliorée de bâtir un bouchon dans un puits de forage horizontal à l'aide d'un comprimé fluidique pompé dans le puits de forage à la fin d'un traitement de fracturation. Le comprimé fluidique comprend une concentration élevée d'un agent de soutènement ultra-léger, tel qu'un agent de soutènement qui flotte de manière sensiblement neutre ou un mélange d'agents de soutènement ultra-léger. Le comprimé fluidique est pompé dans le puits de forage jusqu'à ce qu'il atteigne presque les fractures dans une zone d'intérêt. On cesse ou on réduit ensuite le pompage, afin de permettre aux fractures de se fermer partiellement. L'agent de soutènement ultra-léger demeure suspendu dans le comprimé fluidique pendant qu'il est immobile. On reprend ensuite le pompage à un débit très lent ou comme secousses courtes de la pompe, faisant ainsi en sorte que l'agent de soutènement dans le comprimé fluidique se détache jusqu'à la formation d'un bouchon charnière.

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