Abstract: The invention relates to a hydraulic pump wherein a barrel is in sliding connection with a shaft and is driven in rotation by the shaft. A housing is formed in the barrel, the shaft sliding in the housing while projecting from the front face of the barrel. The housing and the shaft defining between them a balancing chamber, the balancing chamber being connected to a delivery aperture in such a way that fluid in the balancing chamber exerts a compressive force on the barrel which tends to press the barrel against a port plate.

Abstract: Disclosed techniques include a method of removing wellbore liquid from a wellbore that extends within a subterranean formation, comprising positioning a pump downhole in the wellbore, electrically powering the pump, expanding and contracting a membrane by pumping a fluid with the pump, wherein expanding and contracting the membrane creates a pressure for removing the wellbore liquid from the well, and removing the wellbore liquid from the well using the pressure.

Abstract: A hydraulic depth-control device for a submersible body comprises: a variable-volume ballast space, a pressure accumulator comprising a hydraulic chamber and a gas chamber, which chambers are separated by a deformable or mobile wall, the gas chamber containing a gas at an absolute pressure higher than atmospheric pressure, a hydraulic pump coupled to an electric motor, the hydraulic pump having a suction inlet connected to the ballast space and a delivery outlet connected to the hydraulic chamber of the pressure accumulator, a return hydraulic circuit connecting the hydraulic chamber of the pressure accumulator to the ballast space via an electrically operated valve, and a hydraulic fluid arranged in the ballast space, the hydraulic pump, the hydraulic chamber of the pressure accumulator and the return hydraulic circuit.

Abstract: The invention relates to a hydraulic pump wherein a barrel is in sliding connection with a shaft and is driven in rotation by the shaft. A housing is formed in the barrel, the shaft sliding in the housing while projecting from the front face of the barrel. The housing and the shaft defining between them a balancing chamber, the balancing chamber being connected to a delivery aperture in such a way that fluid in the balancing chamber exerts a compressive force on the barrel which tends to press the barrel against a port plate.

Abstract: A hydraulic depth-control device for a submersible body comprises: a variable-volume ballast space, a pressure accumulator comprising a hydraulic chamber and a gas chamber, which chambers are separated by a deformable or mobile wall, the gas chamber containing a gas at an absolute pressure higher than atmospheric pressure, a hydraulic pump coupled to an electric motor, the hydraulic pump having a suction inlet connected to the ballast space and a delivery outlet connected to the hydraulic chamber of the pressure accumulator, a return hydraulic circuit connecting the hydraulic chamber of the pressure accumulator to the ballast space via an electrically operated valve, and a hydraulic fluid arranged in the ballast space, the hydraulic pump, the hydraulic chamber of the pressure accumulator and the return hydraulic circuit.

Abstract: Disclosed techniques include a method of removing wellbore liquid from a wellbore that extends within a subterranean formation, comprising positioning a pump downhole in the wellbore, electrically powering the pump, expanding and contracting a membrane by pumping a fluid with the pump, wherein expanding and contracting the membrane creates a pressure for removing the wellbore liquid from the well, and removing the wellbore liquid from the well using the pressure.

Abstract: A fluid pumping device for placing inside a casing extending into a drilling well in order to pump a fluid present in a lower zone of the casing and delivering it to an upper zone of the casing. The fluid pumping device comprises an assembly of cylindrical elements placed end to end, the cylindrical elements of this assembly comprising: a seal to cooperate with the casing to ensure a tight seal between the lower zone and the upper zone; a hydraulic pump; an electric motor for driving the hydraulic pump, lubricated by a hydraulic fluid; and a compensator to balance the pressure of the hydraulic fluid lubricating the electric motor with the pressure of the fluid in the lower zone of the casing.

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: Device for pumping fluid located under conditions of high ambient temperature and pressure which must deliver at high pressure including a hydraulic delivery pump (11) linked to a hydraulic motor (40), characterized in that the hydraulic motor (40) is connected to the hydraulic delivery pump (10) by a shaft (41), the shaft (41) passing through a leaktight rotating seal (50) which separates the hydraulic fluid (42) returned from the hydraulic motor (40) from the lubricating fluid (5) for the hydraulic pump (10).

Abstract: A hydraulic pump able to function in one or the other rotating direction is of the type including a rotating barrel bearing pistons applied against a valve plate provided with two symmetrical opposed drillings. The valve plate provided with two symmetrical and opposed drillings, one connected to one of the output openings of the pump, the other one connected to the other output opening, is jointly linked to a double piston having two sections of equal surfaces, one of these surfaces being connected with one of the two output openings, the other one being connected with the other output opening so that valve plate is always applied against barrel bearing pistons by the discharge pressure in any rotating direction of the pump.

Abstract: A hydraulic pump rotates in both directions of rotation, and includes a casing, a common drive shaft mounted so as to be able to rotate relative to the casing, two swashplates borne by the common drive shaft, these two swashplates being symmetric and opposite each other and each including one supply crescent, a respective hollow piston pressing against each swashplate via the intermediary of a slipper shoe and designed to slide in a respective cylinder connected to the casing, the crescent of the swashplate being in each case arranged so as to pass over the hollow piston during a suction phase of the hollow piston, each cylinder being fitted with a check valve on the discharge side, such that only one of the two swashplates provides an output when the drive shaft rotates in one direction, the other swashplate providing an output when the shaft rotates in the other direction.

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: Device for pumping fluid located under conditions of high ambient temperature and pressure which must deliver at high pressure including a hydraulic delivery pump (11) linked to a hydraulic motor (40), characterised in that the hydraulic motor (40) is connected to the hydraulic delivery pump (10) by a shaft (41), the shaft (41) passing through a leaktight rotating seal (50) which separates the hydraulic fluid (42) returned from the hydraulic motor (40) from the lubricating fluid (5) for the hydraulic pump (10).

Abstract: A deliquification pump for deliquifying a well comprises a fluid end pump adapted to pump a fluid from a wellbore. In addition, the deliquification pump comprises a hydraulic pump adapted to drive the fluid end pump. The hydraulic pump includes a first internal pump chamber and a first pump assembly disposed in the first chamber. The first pump assembly includes a piston having a first end, a second end, and a throughbore extending between the first end and the second end. In addition, the first pump assembly includes a first wobble plate including a planar end face axially adjacent the second end of the piston and a slot extending axially through the first wobble plate. The first wobble plate is adapted to rotate about the central axis relative to the housing to axially reciprocate the piston and cyclically place the throughbore of the piston in fluid communication with the slot.

Abstract: An automatic-locking hydraulic jack has a piston (1, 30) that slides into a cylinder (3-2, 32). Locking of the piston is achieved by elastic deformation of either the inside wall (2) of the cylinder or of the outside wall of the piston (30) so as to ensure that the one is tightly clamped over the other. The locking of the jack is maintained by pressure that causes the elastic deformation of the inside wall of the cylinder (3-2) or of the outside wall of the piston (30), until the jack is unlocked by neutralizing the elastic deformation.

Abstract: Automatic-locking hydraulic jack of the type that includes a piston (1, 30) that slides into a cylinder (3-2, 32), in which the locking of the piston is achieved by elastic deformation of either the inside wall (2) of the cylinder or of the outside wall of the piston (30) so as to ensure that the one is tightly clamped over the other, characterized by the fact that the locking of the jack is achieved permanently by way of pressure that causes the elastic deformation of the inside wall of the cylinder (3-2) or of the outside wall of the piston (30), whereby the unlocking of the jack is achieved by neutralizing this permanent deformation.

Abstract: Spring barrel pump characterized by the fact that the bores (2) in which the pistons (4) move are provided by way of the spring barrel (1) diametrically to its axis (XX).