Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: A coated article comprises a substrate and a self-healing coating disposed on a surface of the substrate, the self-healing coating comprising a metallic matrix; and a plurality of micro- or nano-sized particles dispersed in the metallic matrix; the micro- or nano-sized particles comprising an active agent disposed in a carrier comprising a micro- or nano-sized metallic container, a layered structure, a porous structure, or a combination comprising at least one of the foregoing.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: A pump for a reductant insertion assembly, comprises a housing configured to receive a reductant. A pumping element is disposed within the housing. The pumping element configured to pressurize the reductant and communicate the pressurized reductant out of the housing. The housing and/or the pumping element comprises aluminum, and the pump further comprises a corrosion resistant layer disposed on at least a portion of a surface of the housing and/or the pumping element that is configured to contact the reductant. The corrosion resistant layer comprising a fluoropolymer.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: Devices and methods for detecting chemicals are disclosed. A device configured for use in a wellbore includes a sensor including a quantum tunneling composite (QTC) material configured to exhibit a change in electrical resistance responsive to the sensor contacting a target chemical. The sensor includes electrical resistance measuring circuitry operably coupled to the QTC material and configured to measure the electrical resistance of the QTC material and output a sensor signal indicating the electrical resistance. A method comprises deploying the sensor into the wellbore, measuring the electrical resistance of the QTC material, and determining the presence of the target chemical responsive to detecting changes in the electrical resistance of the QTC material. Another method includes selecting at least one of the QTC material and an active material to interact with a target wellbore chemical to change the electrical resistance of the QTC material.

Abstract: A coated article comprises a substrate and a self-healing coating disposed on a surface of the substrate, the self-healing coating comprising a metallic matrix; and a plurality of micro- or nano-sized particles dispersed in the metallic matrix; the micro- or nano-sized particles comprising an active agent disposed in a carrier comprising a micro- or nano-sized metallic container, a layered structure, a porous structure, or a combination comprising at least one of the foregoing.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: A coated article comprises a substrate and a self-healing coating disposed on a surface of the substrate, the self-healing coating comprising a metallic matrix; and a plurality of micro- or nano-sized particles dispersed in the metallic matrix; the micro- or nano-sized particles comprising an active agent disposed in a carrier comprising a micro- or nano-sized metallic container, a layered structure, a porous structure, or a combination comprising at least one of the foregoing.

Abstract: Devices and methods for detecting chemicals are disclosed. A device configured for use in a wellbore includes a sensor including a quantum tunneling composite (QTC) material configured to exhibit a change in electrical resistance responsive to the sensor contacting a target chemical. The sensor includes electrical resistance measuring circuitry operably coupled to the QTC material and configured to measure the electrical resistance of the QTC material and output a sensor signal indicating the electrical resistance. A method comprises deploying the sensor into the wellbore, measuring the electrical resistance of the QTC material, and determining the presence of the target chemical responsive to detecting changes in the electrical resistance of the QTC material. Another method includes selecting at least one of the QTC material and an active material to interact with a target wellbore chemical to change the electrical resistance of the QTC material.

Abstract: Devices and methods for detecting chemicals are disclosed. A device configured for use in a wellbore includes a sensor including a quantum tunneling composite (QTC) material configured to exhibit a change in electrical resistance responsive to the sensor contacting a target chemical. The sensor includes electrical resistance measuring circuitry operably coupled to the QTC material and configured to measure the electrical resistance of the QTC material and output a sensor signal indicating the electrical resistance. A method comprises deploying the sensor into the wellbore, measuring the electrical resistance of the QTC material, and determining the presence of the target chemical responsive to detecting changes in the electrical resistance of the QTC material. Another method includes selecting at least one of the QTC material and an active material to interact with a target wellbore chemical to change the electrical resistance of the QTC material.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: A coated article comprises a substrate and a self-healing coating disposed on a surface of the substrate, the self-healing coating comprising a metallic matrix; and a plurality of micro- or nano-sized particles dispersed in the metallic matrix; the micro- or nano-sized particles comprising an active agent disposed in a carrier comprising a micro- or nano-sized metallic container, a layered structure, a porous structure, or a combination comprising at least one of the foregoing.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings.

Abstract: Devices and methods for detecting chemicals are disclosed. A device configured for use in a wellbore includes a sensor including a quantum tunneling composite (QTC) material configured to exhibit a change in electrical resistance responsive to the sensor contacting a target chemical. The sensor includes electrical resistance measuring circuitry operably coupled to the QTC material and configured to measure the electrical resistance of the QTC material and output a sensor signal indicating the electrical resistance. A method comprises deploying the sensor into the wellbore, measuring the electrical resistance of the QTC material, and determining the presence of the target chemical responsive to detecting changes in the electrical resistance of the QTC material. Another method includes selecting at least one of the QTC material and an active material to interact with a target wellbore chemical to change the electrical resistance of the QTC material.