Abstract: Downhole tools comprising a body, wherein at least a portion of the body is degradable when exposed to a wellbore environment; and at least one oil-degradable sealing element composed of an oil-degradable elastomer, wherein the oil-degradable sealing element degrades in the wellbore environment. The oil-degradable elastomer is selected from the group consisting of an oil-degradable natural rubber, an oil-degradable synthetic rubber, and any combination thereof.

Abstract: Downhole tools comprising a body and at least one sealing element, wherein at least a portion of the body is degradable when exposed to a wellbore environment; and a retention mechanism configured to retain the sealing element in place during degradation of the portion of the body that is degradable, wherein the downhole tool is capable of actuating to fluidly seal two sections of the wellbore with the sealing element.

Abstract: An example wellbore isolation device includes a mandrel and one or more solid sealing elements disposed about the mandrel and plastically deformable to seal against an inner wall of a casing or an inner wall of a wellbore. A slip wedge is disposed about the mandrel on a first axial end of the one or more solid sealing elements, and a radial shoulder positioned on the mandrel at a second axial end of the one or more sealing elements. At least the slip wedge applies a compressive force on the one or more solid sealing elements and thereby plastically deforms the one or more solid sealing elements into sealing engagement with the inner wall of the casing or the wellbore.

Abstract: Downhole tools including at least one component made of a doped magnesium alloy solid solution that at least partially degrades in the presence of an electrolyte. The downhole tool is selected from the group consisting of a wellbore isolation device, a completion tool, a drill tool, a testing tool, a slickline tool, a wireline tool, an autonomous tool, a tubing conveyed perforating tool, and any combination thereof.

Abstract: An example downhole tool for use in a wellbore lined with casing includes a wellbore isolation device that provides a plurality of components including a mandrel that defines a central flow passage that allows fluid flow in at least one direction through the wellbore isolation device, the wellbore isolation device providing an inner diameter and an outer diameter. A minimum production flow area is provided across the wellbore isolation device and is determined by at least one of: a flow area across the wellbore isolation device that is at least 1/16 a total flow area of the casing at a location of the wellbore isolation device within the wellbore, and a flow area resulting from the inner diameter being at least 25% of the outer diameter. At least the mandrel is made of a slowly degradable material that degrades when exposed to a wellbore environment.

Abstract: A device for generating electrical energy from mechanical motion includes a buoy housing and at least one force modifier disposed at least partially within the interior of the buoy housing. The force modifier receives an input force and applies a modified force to another component. The force modifier includes a hydraulic system and the hydraulic system includes a first hydraulic piston having a first area and a second hydraulic piston having a second area, where the first area and the second area are not equal.

Abstract: A device generates electrical energy from mechanical motion in a downhole environment. The device includes a magnetostrictive element and an electrically conductive coil. The magnetostrictive element has a first end and a second end. The first and second ends are coupled between two connectors. The magnetostrictive element is configured to experience axial strain in response to radial movement of at least one of the connectors relative to the other connector. The electrically conductive coil is disposed in proximity to the magnetostrictive element. The coil is configured to generate an electrical current in response to a change in flux density of the magnetostrictive element.

Abstract: A device generates electrical energy from mechanical motion in a downhole environment. The device includes a magnetostrictive element and an electrically conductive coil. The magnetostrictive element has a first end and a second end. The first and second ends are coupled between a rotor and a bearing. The magnetostrictive element is configured to experience axial strain in response to radial movement of at least one of the rotor or the bearing with reference to the other. The electrically conductive coil is disposed in proximity to the magnetostrictive element. The coil is configured to generate an electrical current in response to a change in flux density of the magnetostrictive element.

Abstract: A device for generating electrical energy from mechanical motion includes a buoy housing and at least one force modifier disposed at least partially within the interior of the buoy housing. The force modifier receives an input force and applies a modified force to another component. The force modifier includes a hydraulic system and the hydraulic system includes a first hydraulic piston having a first area and a second hydraulic piston having a second area, where the first area and the second area are not equal.

Abstract: An example wellbore isolation device includes a mandrel and one or more solid sealing elements disposed about the mandrel and plastically deformable to seal against an inner wall of a casing or an inner wall of a wellbore. A slip wedge is disposed about the mandrel on a first axial end of the one or more solid sealing elements, and a radial shoulder positioned on the mandrel at a second axial end of the one or more sealing elements. At least the slip wedge applies a compressive force on the one or more solid sealing elements and thereby plastically deforms the one or more solid sealing elements into sealing engagement with the inner wall of the casing or the wellbore.

Abstract: Downhole tools including at least one component made of a doped magnesium alloy solid solution that at least partially degrades in the presence of an electrolyte. The downhole tool is selected from the group consisting of a wellbore isolation device, a completion tool, a drill tool, a testing tool, a slickline tool, a wireline tool, an autonomous tool, a tubing conveyed perforating tool, and any combination thereof.

Abstract: Downhole tools comprising a body, wherein at least a portion of the body is degradable when exposed to a wellbore environment; and at least one oil-degradable sealing element composed of an oil-degradable elastomer, wherein the oil-degradable sealing element degrades in the wellbore environment. The oil-degradable elastomer is selected from the group consisting of an oil-degradable natural rubber, an oil-degradable synthetic rubber, and any combination thereof.

Abstract: The device generates electrical energy from mechanical motion. The device includes at least one magnetostrictive element and at least one force modifier. The force modifier is coupled to the magnetostrictive element. The force modifier receives an input force and applies a modified force to the magnetostrictive element.

Abstract: An example downhole tool for use in a wellbore lined with casing includes a wellbore isolation device that provides a plurality of components including a mandrel that defines a central flow passage that allows fluid flow in at least one direction through the wellbore isolation device, the wellbore isolation device providing an inner diameter and an outer diameter. A minimum production flow area is provided across the wellbore isolation device and is determined by at least one of: a flow area across the wellbore isolation device that is at least 1/16 a total flow area of the casing at a location of the wellbore isolation device within the wellbore, and a flow area resulting from the inner diameter being at least 25% of the outer diameter. At least the mandrel is made of a slowly degradable material that degrades when exposed to a wellbore environment.

Abstract: Downhole tools comprising a body and at least one sealing element, wherein at least a portion of the body is degradable when exposed to a wellbore environment; and a retention mechanism configured to retain the sealing element in place during degradation of the portion of the body that is degradable, wherein the downhole tool is capable of actuating to fluidly seal two sections of the wellbore with the sealing element.

Abstract: A device for converting wave energy includes a surface float, a heave plate, at least one load carrying structure that is mechanically coupled to at least one component of at least one generator on the surface float and the heave plate. The heave plate has an asymmetric geometry to facilitate a first level of resistance to movement in an upward direction and a second level of resistance in a downward direction. The first level of resistance is higher than the second level of resistance. The at least one load carrying structure includes a flexible tether. The at least one component is configured to experience force changes caused by hydrodynamic forces acting on the surface float and heave plate.

Abstract: A device for generating electricity includes a buoyant structure, a heave plate, at least one load carrying structure that is mechanically coupled to both the buoyant structure and the heave plate, and at least one magnetostrictive element. The magnetostrictive element is configured to to experienceforce changes applied by the load carrying structure caused by hydrodynamic forces acting on the device.

Abstract: An apparatus for harvesting energy is described. The apparatus includes a vibration component and a moving mass. The vibration component has a first and second end and further includes a magnetostrictive material. The vibration component further includes a conduction coil wrapped around the magnetostrictive material. The moving mass is coupled to the second end of the vibration assembly. The mass is configured to move in an oscillating path in response to forces acting on the vibration energy harvesting apparatus, inducing strain on the magnetostrictive material. The strain on the magnetostrictive material changes a magnetic property of the magnetostrictive material, inducing electrical energy in the conduction coil wrapped around the magnetostrictive material. Other embodiments of the apparatus are also described.

Abstract: An apparatus for harvesting electrical power from mechanical energy is described. The apparatus includes: a flux path. The flux path includes: a magnetic material having a magnetic property that is a function of stress on the magnetic material; a first magnetically conductive material proximate the magnetic material; a magnet in the flux path, wherein a magnetomotive force of the magnet causes magnetic flux; and a component configured to transfer changes in load caused by an external source to the magnetic material.

Abstract: Systems include buoys, tethers, and power take-off (PTO) modules to generate electrical energy from the mechanical energy of ocean waves.