Abstract: A firing head assembly may include a tubular housing; a valve slidably disposed within the tubular housing; a lock mandrel disposed in the tubular housing between the valve and the tubular housing second end; a firing pin holder disposed in the tubular housing between the lock mandrel and the tubular housing second end; an engagement mechanism operably contacting the lock mandrel and the firing pin holder latch. The valve may have a piston end exposed to the lumen. The lock mandrel may be restrained from axial movement by a shear element. The firing pin holder may include a firing pin and latch. The engagement mechanism may be switchable between an engaged arrangement and a disengaged arrangement. The engagement mechanism may be configured to transition from the engaged arrangement to the disengaged arrangement in response to an axial movement of the lock mandrel.

Abstract: A well abandonment system includes a jet cutter assembly. The jet cutter assembly includes a first sub including a first bulkhead and a jet cutter tool. The jet cutter tool includes a radial shaped charge and a detonator to detonate the radial shaped charge. A first end of the jet cutter tool is connected to the first sub and a second end of the jet cutter tool is connected to the second sub. The jet cutter assembly may include bulkheads that facilitate electrical communication along a length of the jet cutter assembly. A shock absorber is connected to the jet cutter tool in order to mitigate or prevent shock from impacting the jet cutter upon activation of a perforating gun or components of a tool string that is connected to the jet cutter. The shock absorber may include at least one of a sleeve, biasing member, or wireline.

Abstract: A firing head assembly may include a tubular housing; a valve slidably disposed within the tubular housing; a lock mandrel disposed in the tubular housing between the valve and the tubular housing second end; a firing pin holder disposed in the tubular housing between the lock mandrel and the tubular housing second end; an engagement mechanism operably contacting the lock mandrel and the firing pin holder latch. The valve may have a piston end exposed to the lumen. The lock mandrel may be restrained from axial movement by a shear element. The firing pin holder may include a firing pin and latch. The engagement mechanism may be switchable between an engaged arrangement and a disengaged arrangement. The engagement mechanism may be configured to transition from the engaged arrangement to the disengaged arrangement in response to an axial movement of the lock mandrel.

Abstract: A firing head assembly may include a tubular housing; a valve slidably disposed within the tubular housing; a lock mandrel disposed in the tubular housing between the valve and the tubular housing second end; a firing pin holder disposed in the tubular housing between the lock mandrel and the tubular housing second end; an engagement mechanism operably contacting the lock mandrel and the firing pin holder latch. The valve may have a piston end exposed to the lumen. The lock mandrel may be restrained from axial movement by a shear element. The firing pin holder may include a firing pin and latch. The engagement mechanism may be switchable between an engaged arrangement and a disengaged arrangement. The engagement mechanism may be configured to transition from the engaged arrangement to the disengaged arrangement in response to an axial movement of the lock mandrel.

Abstract: A firing head assembly may include a tubular housing; a valve slidably disposed within the tubular housing; a lock mandrel disposed in the tubular housing between the valve and the tubular housing second end; a firing pin holder disposed in the tubular housing between the lock mandrel and the tubular housing second end; an engagement mechanism operably contacting the lock mandrel and the firing pin holder latch. The valve may have a piston end exposed to the lumen. The lock mandrel may be restrained from axial movement by a shear element. The firing pin holder may include a firing pin and latch. The engagement mechanism may be switchable between an engaged arrangement and a disengaged arrangement. The engagement mechanism may be configured to transition from the engaged arrangement to the disengaged arrangement in response to an axial movement of the lock mandrel.

Abstract: Methods are disclosed for assembling a perforating gun string in a wellbore. One method includes assembling a first perforating gun assembly into a lubricator, connecting the lubricator to a blowout preventer coupled to a wellhead, lowering the first perforating gun assembly on a conveyance into the blowout preventer, engaging the first perforating gun assembly with sealing rams of the blowout preventer, detaching the conveyance from the first perforating gun assembly and removing the conveyance from the blowout preventer, disconnecting the lubricator from the blowout preventer, assembling a second perforating gun assembly into the lubricator, re-connecting the lubricator to the blowout preventer, lowering the second perforating gun assembly into the blowout preventer and attaching the second perforating gun assembly to the first perforating gun assembly, and repeating the process to form a perforating gun string.