Patent ID: 8113119
Filing Date: 2012-02-14
Classification: E21B,F42C,F42D

Abstract:
1. A method of assembling an explosive tool, comprising: installing a detonator inside an explosive tool, wherein the explosive tool is configured for attaching to a work string; installing a charge inside the explosive tool, wherein the detonator is operable to ignite the charge by thermal energy propagation between the detonator and the charge; installing a pressure actuated safety that is configured to prevent propagation of sufficient thermal energy between the detonator and the charge to ignite the charge when the pressure actuated safety is at surface pressure that is less than a predefined pressure thresold and to not prevent propagation of sufficient thermal energy between the detonator and the charge to ignite the charge when the pressure actuated safety is at at least a predefined pressure threshold; installing a temperature actuated safety that is configured to prevent propagation of sufficient thermal energy between the detonator and the charge to ignite the charge when the temperature actuated safety is at a temperature that is less than a predefined temperature threshold and to not prevent propagation of sufficient thermal energy between the detonator and the charge to ignite the charge when the temperature actuated safety is subjected to at least the predefined temperature threshold.