Dissolvable downhole trigger device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/00 (2006.01) E21B 23/01 (2006.01)

Patent

CA 2669732

A trigger device for setting a downhole tool is disclosed. The trigger device includes a retaining member that prevents the downhole tool from setting until it is properly positioned within the well. Regardless of the type of downhole tool or the type of trigger device, the retaining member includes a dissolvable material that dissolves when contacted by a solvent. The dissolvable material is preferably one that dissolves at a known rate so that the amount of time necessary for the downhole tool to set is pre-determined. Preferably, the solvent is a water- based or hydrocarbon-based drilling fluid or mud.

L'invention concerne un dispositif d'actionnement destiné à un ouitl de fond de trou. Ce dispositif d'actionnement comprend un élément de retenue empêchant l'actionnement de l'outil de fond de trou avant que cet outil ne soit correctement positionné à l'intérieur du puits de forage. Quel que soit le type de l'outil de fond ou le type de dispositif d'actionnement, l'élément de retenue de l'invention comprend une matière soluble qui se dissout au contact d'un solvant. Cette matière soluble est de préférence une matière qui se dissout à une vitesse connue de sorte que la durée nécessaire pour actionner un tel outil de fond puisse être prédéterminée. De préférence, le solvant est un fluide ou une boue de forage à base d'eau ou à base d'hydrocarbures.

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