US 2013/0277109 A1 · Surface Safe Explosive Tool

Abstract

An explosive tool comprises a body structure, a charge, a detonator to ignite the charge via propagation of thermal energy, a pressure actuated safety to prevent propagation of sufficient thermal energy to ignite the charge when the pressure actuated safety is subjected to a surface pressure and to not prevent propagation of sufficient thermal energy to ignite the charge when the pressure actuated safety is subjected to at least a predefined pressure threshold, and a temperature actuated safety to prevent propagation of sufficient thermal energy to ignite the charge when the temperature actuated safety is subjected to a surface temperature and to not prevent propagation of sufficient thermal energy to ignite the charge when the temperature actuated safety is subjected to at least a predefined temperature threshold. The charge, the detonator, the pressure actuated safety, and the temperature actuated safety are contained within the body structure.

Claims20

Dependent claims

An explosive tool, comprising:

a body structure;
a detonator disposed within a first chamber within the body structure;
a charge disposed within a second chamber within the body structure;
a port configured to provide communication between the first chamber and the second chamber;
a pressure actuated safety configured to block the communication through the port in response to a pressure below a predetermined pressure threshold and allow the communication through the port in response to a pressure at or above the predetermined pressure threshold;
and
a temperature actuated safety configured to block the communication through the port in response to a temperature below a predetermined temperature threshold and allow the communication through the port in response to a temperature at or above the predetermined temperature threshold,
wherein at least a portion of the pressure actuated safety is positioned within a portion of the temperature actuated safety when the pressure actuated safety is configured block communication through the port and when the temperature actuated safety is configured to block communication through the port.

5 more elements

A method of detonating a charge in an explosive tool, the method comprising:

disposing an explosive tool within a wellbore, wherein the explosive tool comprises:
a pressure actuated safety blocking communication through a port, and
a temperature actuated safety blocking the communication through the port, wherein at least a portion of one of the pressure actuated safety or the temperature actuated safety is positioned within the other component within the port;
exposing the temperature actuated safety to a temperature above a predetermined temperature threshold;
exposing the pressure actuated safety to a pressure above a predetermined pressure threshold;
unblocking the communication through the port in response to exposing the temperature actuated safety to the temperature above the predetermined temperature threshold and exposing the pressure actuated safety to the pressure above the predetermined pressure threshold;
detonating the detonator in a first chamber in fluid communication with the port;
propagating energy from the first chamber through the unblocked port;
and
detonating a charge in a second chamber in fluid communication with the first chamber through the port in response to propagating the energy through the port.

7 more elements

Dependencies are inferred from the claim text.

Surface Safe Explosive Tool

Life of this patent

Surface Safe Explosive Tool

Life of this patent

Abstract

Claims20