An apparatus for use in a well bore is described herein. The apparatus includes a one-piece housing having a length in an axial direction from a first end to a second end, and end wall and a sidewall defining a cavity within the housing. The apparatus also includes a frame inside the cavity. The frame includes a charge receptacle, a detonator receptacle, a first electrical contact and a second electrical contact. The apparatus further includes a conductive material coupled with the first electrical contact.

An interchangeable module configured to be used in an integrated perforating gun and setting tool system, the interchangeable module having a body having a chamber, a first electrical connection located at a first end of the chamber, and a second electrical connection located at a second end of the chamber. The first end is opposite to the second end. An addressable switch located inside the chamber, the addressable switch has a digital address. A connection unit located inside the chamber and configured to electrically connect the addressable switch to an initiating device. The interchangeable module is configured to be used (1) between a first gun cluster and a second gun cluster and (2) between a distal gun cluster and a setting tool, and the first and second electrical connections are electrically connected to the addressable switch.

A safety mechanism and method for downhole perforating are disclosed. In one example, a mechanical firing head includes a firing pin carried on a pin carrier within a housing. The firing pin is movable from a retracted position to a firing position for striking an explosive initiator. A retention member retains the firing pin in the retracted position with the safety member in the armed position. A safety member is biased to a safety position that additionally blocks movement of the firing pin. The safety member is moveable to an armed position that unblocks movement of the firing pin in response to an arming pressure supplied to the housing bore. The retention member releases the firing pin in response to a firing pressure supplied to the housing in excess of the firing pressure.

A perforating gun system may include a first gun carrier and a second gun carrier connected to the first gun carrier. A perforating gun assembly may be provided in each gun carrier, the perforating gun assembly including a top connector, a plurality of charge holders, and at least one bottom connector. Upon rotation of the top connector, the one or more charge holders of the first gun carrier may be aligned in a zero-degree phasing with the plurality of charge holders in the second gun carrier, and the position of the top connector may be locked along the length of the second gun carrier.

Components for a perforation gun system are provided including combinations of components that facilitate electrically linking multiple perforation guns to one another with wireless electrical contacts. The perforation gun system includes a bulkhead pin contact assembly. The perforation gun system may further include a wireless detonator and a conductor positioned in a connector of the perforation gun.

A braking and setting device is configured to slow down a movement of a tool in a well and to fix the tool relative to the well. The braking and setting device includes two or more arms configured to extend from the tool, toward the well, to brake the movement of the tool along a longitudinal axis X; a movable piston configured to be hosted fully within the tool and to move only when a well fluid acts on a base portion of the movable piston, while a tip portion of the movable piston pushes away the two or more arms; and an actuation mechanism configured to establish a fluid communication between the well fluid and the base portion of the movable piston. The movable piston moves exclusively due to a force exerted by the well fluid on the movable piston.

An interchangeable module configured to be used in an integrated perforating gun and setting tool system, the interchangeable module having a body having a chamber, a first electrical connection located at a first end of the chamber, and a second electrical connection located at a second end of the chamber. The first end is opposite to the second end. An addressable switch located inside the chamber, the addressable switch has a digital address. A connection unit located inside the chamber and configured to electrically connect the addressable switch to an initiating device. The interchangeable module is configured to be used (1) between a first gun cluster and a second gun cluster and (2) between a distal gun cluster and a setting tool, and the first and second electrical connections are electrically connected to the addressable switch.

A perforating gun may include a gun carrier extending in an axial direction and a tandem seal adapter (TSA). The gun carrier having a maximum outer carrier diameter. The TSA may include a first TSA region having a first TSA outer diameter, a second TSA region having a second TSA outer diameter, and a shoulder surface formed between an outer surface of the first TSA region and an outer surface of the second TSA region. The second TSA outer diameter may be larger than the first TSA outer diameter and smaller than the maximum outer carrier diameter. A portion of the gun carrier may abut with the shoulder surface.

A dynamic underbalance sub for use in a wellbore may include a sub housing, a first chamber provided in an interior of the sub housing, an opening extending through the sub housing and configured such that the first chamber is in fluid communication with an exterior of the sub housing, a second chamber provided in the interior of the sub housing, and a pressure-isolating wall provided between the first chamber and the second chamber.

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.