Abstract: A downhole tool, a well system, and a method are provided. The downhole tool, in one aspect, includes a downhole feature, and expandable metal positioned proximate the downhole feature, the expandable metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this aspect, further includes a radioisotope generator positioned proximate the expandable metal, the radioisotope generator comprising a radioisotope heater unit or a radioisotope thermoelectric generator configured to increase or decrease a rate of reaction of the hydrolysis.

Abstract: A downhole tool, a well system, and a method are provided. The downhole tool, in one aspect, includes a downhole feature, as well as expandable metal positioned proximate the downhole feature, the expandable metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this one aspect, may further include a first electrode coupled between the expandable metal and a first terminal of a thermoelectric generator, the first electrode configured to provide a voltage to the expandable metal to increase or decrease a rate of reaction of the hydrolysis, and a second electrode coupled between the downhole feature and a second terminal of the thermoelectric generator, wherein the thermoelectric generator includes a hot side thermal conductor and a cold side thermal conductor separated by a thermoelectric module, the thermoelectric module including a plurality of n-type semiconductors and p-type semiconductors connected with each other.

Abstract: Energy harvesting devices can be deployed in a wellbore to transform external energy in the wellbore to electric power for consumption by electric devices disposed in the wellbore. A method includes deploying an energy harvesting device downhole in a wellbore, transforming, with the energy harvesting device, external energy in the wellbore to electric power and supplying the electric power from the energy harvesting device to an electric device disposed in the wellbore.

Abstract: Systems and methods of the present disclosure relate to storing carbon dioxide (CO2) underground. A method includes contacting a metal tool with the CO2 and forming hydrated metal carbonates (HMCs) on the tool due to contact of the CO2 with the metal of the tool. Expansion of the tool occurs due to formation of the HMCs.

Abstract: Provided is a downhole tool, a well system, and a method. The downhole tool, in one aspect, includes an expandable metal member positioned about a structure, the expandable metal member comprising a metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this embodiment, further includes a dissimilar cathodic electric conductor isolated within the expandable metal member, the dissimilar cathodic electric conductor configured to initiate a galvanic corrosion effect to increase an expansion rate of the expandable metal member when a reactive fluid comes into contact with the dissimilar cathodic electric conductor and the expandable metal member.

Abstract: A variety of methods/systems/apparatus/compositions are disclosed, including, in one embodiment, a downhole tool (for use in a borehole) having a mandrel, a sealing element including metal particles disposed about the mandrel, and a piston to move a containment component of the downhole tool in an axial direction to move the metal particles in the axial direction, thereby displacing the metal particles in a radial direction toward a borehole wall to expand the sealing element in the radial direction to form a seal between the downhole tool and the borehole wall.

Abstract: A variety of methods/systems/apparatus/compositions are disclosed, including, in one embodiment, a downhole tool (for use in a borehole) having a mandrel, a sealing element including metal particles disposed about the mandrel, and a piston to move a containment component of the downhole tool in an axial direction to move the metal particles in the axial direction, thereby displacing the metal particles in a radial direction toward a borehole wall to expand the sealing element in the radial direction to form a seal between the downhole tool and the borehole wall.

Abstract: Provided is a downhole tool, a well system, and a method. The downhole tool, in one aspect, includes an expandable metal member positioned about a structure, the expandable metal member comprising a metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this embodiment, further includes a dissimilar cathodic electric conductor isolated within the expandable metal member, the dissimilar cathodic electric conductor configured to initiate a galvanic corrosion effect to increase an expansion rate of the expandable metal member when a reactive fluid comes into contact with the dissimilar cathodic electric conductor and the expandable metal member.

Abstract: Systems and methods of the present disclosure relate to storing carbon dioxide (CO2) underground. A method includes contacting a metal tool with the CO2 and forming hydrated metal carbonates (HMCs) on the tool due to contact of the CO2 with the metal of the tool. Expansion of the tool occurs due to formation of the HMCs.

Abstract: A system for a wellbore can include a tubing string positioned downhole in a wellbore and a porous gravel pack. The porous gravel pack can be positioned in an annulus defined at least in part by a surface of the tubing string. The porous gravel pack can be made up of a plurality of grains. Each grain can include a core surrounded at least in part by a sheath. The core can comprise an expandable material that can expand in response to coming in contact with a fluid. The sheath can surround the core and can be deformable in response to the core expanding in response being exposed to a fluid.

Abstract: A tubing string may include a swellable metal material for providing a seal downhole. The swellable metal material may react with a silica material and a water-based fluid to cause the swellable metal material to swell and form a seal within a flow path defined in part by the tubing string.

Abstract: A system for a wellbore can include a tubing string positioned downhole in a wellbore and a porous gravel pack. The porous gravel pack can be positioned in an annulus defined at least in part by a surface of the tubing string. The porous gravel pack can be made up of a plurality of grains. Each grain can include a core surrounded at least in part by a sheath. The core can comprise an expandable material that can expand in response to coming in contact with a fluid. The sheath can surround the core and can be deformable in response to the core expanding in response being exposed to a fluid.

Abstract: A tubing string may include a swellable metal material for providing a seal downhole. The swellable metal material may react with a silica material and a water-based fluid to cause the swellable metal material to swell and form a seal within a flow path defined in part by the tubing string.