A tool string disposable in a wellbore includes a plug configured to seal against an inner surface of a tubular string disposed in the wellbore, and a setting tool coupled to the plug that includes a piston slidably disposed in a setting tool housing of the setting tool and including a central passage, and a combustible assembly disposed in the passage of the piston, wherein the combustible assembly includes a housing and combustible material disposed in the combustible assembly housing, wherein, in response to a pressurization of the central passage of the piston of the setting tool, the setting tool is configured to actuate the plug to seal against the inner surface of the tubular string.

A method including (a) lowering a first tool string into a first wellbore, the tool string including a first perforating gun and a gun switch configured to detonate the first perforating gun, (b) detonating the first perforating gun in response to transmitting a first gun firing signal from a control system to the gun switch, (c) retrieving the tool string from the first wellbore following (c), (d) lowering a second tool string including the gun switch used in the first tool string and a second perforating gun into at least one of the first wellbore and a second wellbore that is different from the first wellbore following (d), and (e) detonating the second perforating gun of the second tool string in response to transmitting a second gun firing signal from the control system to the gun switch.

A downhole apparatus comprises a casing string with a fluid barrier connected in the casing string. A degradable plug is positioned in the casing string above the fluid barrier. The degradable plug and fluid barrier define upper and lower ends of a buoyancy chamber in the casing string. The degradable plug may be degraded to leave an open bore through the casing string after the casing string is lowered into a wellbore.

An apparatus for setting a plug in a borehole penetrating a subsurface formation includes a tool mandrel defining a chamber having a port and a power charge disposed in the chamber for emitting a pressurized gas upon ignition. The apparatus also includes an outer sleeve at least partially surrounding the tool mandrel and defining an annulus between the outer sleeve and the tool mandrel where the annulus is in communication with the port. The apparatus further includes a piston disposed in the annulus and having an outer surface facing uphole within the annulus, the piston being in mechanical communication with a setting sleeve of the plug, wherein displacement of the setting sleeve causes setting of a slip and a seal of the plug.

A setting tool for setting an auxiliary tool in a well includes a housing holding a floating piston assembly, the floating piston assembly having a first end and a second end, which is opposite to the first end, an isolation valve assembly in fluid communication with an interior of the housing, where the isolation valve assembly is facing the second end of the floating piston assembly, and a frangible disc located at the first end of the floating piston assembly, to prevent a high-pressure gas to pass through a bore of the floating piston assembly. The floating piston assembly separates the frangible disc from the isolation valve assembly.

A system combining a setting tool and a frac plug into one assembly thus producing a much shorter and more reliable assembly. More specifically, a downhole assembly comprising a plug section, which itself comprises a top sub, a bottom sub, a slip, and an elastomeric element. The downhole assembly further comprises a power section comprising a body comprising a power charge and one or more ignitors, a firing head, a shearing pin, and a setting tool piston. Additionally, the downhole assembly comprises a check valve, wherein the check valve is positioned downhole from the power charge and inside the setting tool piston; a mandrel comprising a hydraulic chamber and a ball, wherein the mandrel is positioned inside and adjacent to the setting tool piston and the top sub; and a dog.

A setting tool having a tool body, a chamber configured to contain a non-explosive fuel configured to generate gas and plasma, a cavity, a bleed sub located between the chamber and the cavity. The bleed sub is configured to bleed pressure from the chamber to the cavity after the non-explosive fuel has been initiated. The setting tool also includes a piston disposed within the cavity oriented to stroke in a first direction after the non-explosive fuel has been initiated. The piston may divide the cavity into an upper volume that may receive the pressure increase from the bleed sub and a lower volume. The setting tool may also include a shaft mechanically connected to the piston within the lower volume of the cavity. The shaft may include a dampening conduit configured to drain a fluid from the lower volume after the non-explosive fuel has been initiated.

A setting tool comprising a first and a second cylindrical body with inner bores, a third cylindrical body engaged to the first cylindrical body and having an inner cavity with an axial opening adapted to accept a power charge and a having a distal end with a shoulder engaged with the second cylindrical body, a fourth cylindrical body coupled to the third cylindrical body and having a transverse slot, a fifth cylindrical body fixed to the second cylindrical body and having an inner bore wherein the fourth cylindrical body is engaged therewith and further having a radial face within the second cylindrical body, a disc shaped impact dampening material with a hollow center having the fourth cylindrical body is located there through and coupled to the radial face of the fifth cylindrical body, and a sixth cylindrical body coupled to the fifth cylindrical body and having a transverse slot.

Methods for actuating a downhole device in a wellbore. An example of the method is positioning a downhole device in a wellbore, the downhole device comprising a reactive metal and a reaction-inducing fluid; wherein the reaction-inducing fluid is isolated from the reactive metal. The method further includes removing the isolation of the reactive metal such that it reacts with the reaction-inducing fluid to generate a hydrogen gas, and actuating the downhole device with the hydrogen gas.

There is an igniter system for igniting an energetic material. The igniter system includes a housing having a bore; an igniter located inside the bore; a ground wire directly connected to the igniter; and a signal wire directly connected to the igniter. The ground wire and the signal wire form an electrical circuit with the igniter for igniting the energetic material.