Patent ID: 8726996
Filing Date: 2014-05-20
Classification: E21B

Abstract:
1. A downhole tool assembly for use in a wellbore comprising: a tubular body carrying an explosive which is selectively detonated to create a dynamic underbalance or overbalance effect in the wellbore, the tubular body having opposite ends provided with plug assemblies including plug elements movable between a normally collapsed state and an actuable expanded state, wherein each plug assembly includes an elongated hollow cylinder connected to the tubular body and an elongated hollow mandrel is connected to and extends through and beneath the cylinder, wherein the plug elements are adapted to be actuated to the expanded state between the tubular body and an outer extent of the wellbore before the creation of the dynamic underbalance or overbalance effect to isolate a discrete segment of the wellbore to which the dynamic underbalance or overbalance effect is confined, wherein further the plug elements self-deploy to the expanded state upon detonation of the explosive or other activation of the plug elements, the tubular body having an internal chamber adapted to be exposed to the wellbore upon detonation of the explosive or other rupturing of the tubular body.