In a gas generator, a closing member includes: a first region exposed to a side of a second combustion chamber in a closed state, a second region in contact with a partition member from a side of the first combustion chamber in the closed state, and an engagement region that engages an engaged member fixed in a housing in the closed state; and the closing member is configured to have one or a plurality of communication holes be in a closed state by the closing member being supported at the partition member in the second region due to combustion pressure of a first gas generating agent and to have the closed state released by at least a part of the closing member, the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of a second gas generating agent acting on the first region.

In a gas generator, a closing member includes: a first region exposed to a side of a second combustion chamber in a closed state, a second region in contact with a partition member from a side of the first combustion chamber in the closed state, and an engagement region that engages an engaged member fixed in a housing in the closed state; and the closing member is configured to have one or a plurality of communication holes be in a closed state by the closing member being supported at the partition member in the second region due to combustion pressure of a first gas generating agent and to have the closed state released by at least a part of the closing member, the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of a second gas generating agent acting on the first region.

A pyrotechnic igniter includes at least one pyrotechnic material designed to be ignited by a heating element, a case enclosing the at least one pyrotechnic material, and a plastic overmoulding of the case, forming a fixation interface of the igniter and designed to be inserted into a fixation orifice of a support up to an inserted position. The fixation interface of the plastic overmoulding includes at least one deformable part designed to elastically deform during passage into the fixation orifice and assume during an elastic return a blocking position against the support when the igniter is in the inserted position in order to prevent any withdrawal of the igniter.

A pyrotechnic igniter includes at least one pyrotechnic material designed to be ignited by a heating element, a case enclosing the at least one pyrotechnic material, and a plastic overmoulding of the case, forming a fixation interface of the igniter and designed to be inserted into a fixation orifice of a support up to an inserted position. The fixation interface of the plastic overmoulding includes at least one deformable part designed to elastically deform during passage into the fixation orifice and assume during an elastic return a blocking position against the support when the igniter is in the inserted position in order to prevent any withdrawal of the igniter.

This disclosure provides a stackable propellant module for use inside of a gas generation canister. The modules are designed to enable them to be individually fired rather than as a unitary mass, as done in conventional configurations. This enables the generation of a controlled pressure profile rather than an uncontrolled pressure profile determined by the environmental conditions downhole, such as temperature and pressure.

This disclosure provides a stackable propellant module for use inside of a gas generation canister. The modules are designed to enable them to be individually fired rather than as a unitary mass, as done in conventional configurations. This enables the generation of a controlled pressure profile rather than an uncontrolled pressure profile determined by the environmental conditions downhole, such as temperature and pressure.

An ejector for ejecting a combustion product including, an igniter including an ignition charge and an ignition portion, a pyrotechnic agent, and a cup made of metal, the cup including a bottom surface and a peripheral wall, the peripheral wall being contiguous with a peripheral edge of the bottom surface and disposed to surround the ignition portion, the cup further including an accommodating space accommodating therein the pyrotechnic agent, the bottom surface of the cup including a through hole being defined by a plurality of through-hole peripheral edges, and the adjacent through-hole peripheral edges being connected together at a predetermined connection point, and the through hole including a narrow part, in which a width of the through hole defined by each of parts of the two through-hole peripheral edges of the plurality of through-hole peripheral edges decreases gradually with an increasing distance from a center of the bottom surface toward the peripheral edge of the bottom surface, and the narrow part being located closer to the peripheral edge of the bottom surface than a non-narrow part, which is defined by each of other parts of the two through-hole peripheral edges, is located.

An ejector for ejecting a combustion product including, an igniter including an ignition charge and an ignition portion, a pyrotechnic agent, and a cup made of metal, the cup including a bottom surface and a peripheral wall, the peripheral wall being contiguous with a peripheral edge of the bottom surface and disposed to surround the ignition portion, the cup further including an accommodating space accommodating therein the pyrotechnic agent, the bottom surface of the cup including a through hole being defined by a plurality of through-hole peripheral edges, and the adjacent through-hole peripheral edges being connected together at a predetermined connection point, and the through hole including a narrow part, in which a width of the through hole defined by each of parts of the two through-hole peripheral edges of the plurality of through-hole peripheral edges decreases gradually with an increasing distance from a center of the bottom surface toward the peripheral edge of the bottom surface, and the narrow part being located closer to the peripheral edge of the bottom surface than a non-narrow part, which is defined by each of other parts of the two through-hole peripheral edges, is located.

A power charge and method for actuating a wellbore tool with a power charge. The power charge may include a first volume containing a first energetic material and a second volume containing a second energetic material positioned within the first energetic material. The second energetic material may be a faster burning material compared to the first energetic material. The wellbore tool may include a power charge cavity, an initiator positioned in an initiator holder adjacent to the power charge within the power charge cavity, and a gas diverter channel for directing to an expansion chamber gas pressure generated by combustion of the power charge, to actuate the wellbore tool. The method may include inserting the initiator into the intiator holder within the power charge cavity and initiating combustion of the first energetic material and the second energetic material.

A power charge and method for actuating a wellbore tool with a power charge. The power charge may include a first volume containing a first energetic material and a second volume containing a second energetic material positioned within the first energetic material. The second energetic material may be a faster burning material compared to the first energetic material. The wellbore tool may include a power charge cavity, an initiator positioned in an initiator holder adjacent to the power charge within the power charge cavity, and a gas diverter channel for directing to an expansion chamber gas pressure generated by combustion of the power charge, to actuate the wellbore tool. The method may include inserting the initiator into the intiator holder within the power charge cavity and initiating combustion of the first energetic material and the second energetic material.