Abstract: Passive load balancing in a fluid bearing for a rotational device is provided using disclosed devices, systems, and methods. In particular, fluid bearing apparatus may include an outer member with an inner member disposed concentrically within the outer member. A fluid inlet may provide fluid communication with a surrounding space between the inner and outer members. A bearing may be connected to the inner member and may extend into the surrounding space. The apparatus may also include a piston located in the surrounding space between the bearing and the fluid inlet. A supporting fluid is located between the piston and a surface of the bearing to transmit force from the piston to the bearing.

Abstract: A jar includes the following: a mandrel; an outer housing slidably disposed about the mandrel; a low pressure chamber having a first port and formed between the mandrel and the outer housing; a high pressure chamber having a second port and formed between the mandrel and the outer housing; a fluid passage between the first and second port; and a valve disposed in the fluid passage.

Abstract: An apparatus comprises a mandrel having a longitudinal axis and further comprises a plurality of pivoting elements spaced apart along a circumference of a cross-section of the mandrel. Each of the pivoting elements is pivotable around a transversal axis that is perpendicular to the longitudinal axis.

Abstract: Passive load balancing in a fluid bearing for a rotational device is provided using disclosed devices, systems, and methods. In particular, fluid bearing apparatus may include an outer member with an inner member disposed concentrically within the outer member. A fluid inlet may provide fluid communication with a surrounding space between the inner and outer members. A bearing may be connected to the inner member and may extend into the surrounding space. The apparatus may also include a piston located in the surrounding space between the bearing and the fluid inlet. A supporting fluid is located between the piston and a surface of the bearing to transmit force from the piston to the bearing.

Abstract: An energy harvesting rotating control device includes an inner member and a locking member. The inner member is configured to rotate about a longitudinal axis. The locking member is configured to move toward the longitudinal axis of the inner member and engage a shoulder of the inner member. An actuator is configured to move the locking member when actuated by an electrical power source. The locking member engaging the shoulder of the inner member limits the movement of the inner member.

Abstract: Embodiments disclosed herein relate to a jar including the following: a mandrel; an outer housing slidably disposed about the mandrel; a ball stop housing disposed below the outer housing; a lower sub disposed below the ball stop housing; and a ball stop assembly disposed in the ball stop housing. The ball stop assembly includes a ball stop pivotally disposed in the ball stop assembly.

Abstract: Embodiments disclosed herein relate to a jar including the following: a mandrel; an outer housing slidably disposed about the mandrel; a ball stop housing disposed below the outer housing; a lower sub disposed below the ball stop housing; and a ball stop assembly disposed in the ball stop housing. The ball stop assembly includes a ball stop pivotally disposed in the ball stop assembly.

Abstract: An apparatus comprises a mandrel having a longitudinal axis and further comprises a plurality of pivoting elements spaced apart along a circumference of a cross-section of the mandrel. Each of the pivoting elements is pivotable around a transversal axis that is perpendicular to the longitudinal axis.

Abstract: Apparatuses and methods comprising a cementing head comprising a stationary body comprising a toothed ring; a rotating body disposed below the stationary body, the rotating body comprising an armature disposed inside the toothed ring; a battery disposed on the rotating body; and a wire connected to the armature and the battery.

Abstract: Embodiments disclosed herein relate to a jar including the following: a mandrel; an outer housing slidably disposed about the mandrel; a ball stop housing disposed below the outer housing; a lower sub disposed below the ball stop housing; and a ball stop assembly disposed in the ball stop housing. The ball stop assembly includes a ball stop pivotally disposed in the ball stop assembly.

Abstract: A downhole valve assembly is attached to a drillstring and includes an upper drillstring connection, a lower drillstring connection, and a tubular body comprising a through bore, and further includes a weight activated mechanism configured to close the through bore when the drillstring is lifted.

Abstract: Apparatus and methods for providing fluid and projectiles to downhole tubulars includes a manifold. The manifold may include a housing, a cartridge disposed within the housing, and an actuator. The cartridge includes multiple throughbores for selectively allowing a fluid flow to pass through, and storing a projectile. The actuator is adapted to move the multiple throughbores of the cartridge out of and into the fluid flow to release the stored projectile into the fluid flow. The manifold may include multiple projectiles that are stored laterally relative to each other for radial translation and release into the fluid flow.

Abstract: A downhole valve assembly is attached to a drillstring and includes an upper drillstring connection, a lower drillstring connection, and a tubular body comprising a through bore, and further includes a weight activated mechanism configured to close the through bore when the drillstring is lifted.

Abstract: Apparatus and methods for cementing tubulars in a borehole are disclosed In some embodiments, the apparatus includes a housing, a cartridge disposed within the housing, and an actuator. The housing includes a fluid entry port and a fluid exit port The cartridge includes a first chamber and is moveable between a first and a second position In the first position, the first chamber is out of fluid communication with the entry port and the exit port. In the second position, the first chamber is in fluid communication with the entry port and the exit port. The actuator is adapted to move the cartridge between the first and second positions.

Abstract: A high pressure turbomachine includes a casing having an interior chamber, an opening into the interior chamber, and a generally annular wall section extending about the opening and having an outer circumferential surface. A closure device is engageable with the casing and includes a body having an inner circumferential overlap surface defining an opening. The closure body is configured to receive at least a portion of the casing annular wall section within the body opening such that the closure body overlap surface extends about the annular wall section outer surface so that the body substantially closes the casing opening. When the casing chamber contains high pressure fluid, the casing wall section expands radially outwardly such that the casing section outer surface pushes generally radially outwardly against the closure body overlap surface, the closure body being configured to either minimize or substantially prevent casing wall radial expansion.