A device is taught for pumping fluid from a downhole reservoir up to surface. The device comprises a conduit extending through at least a portion an axial bore of the rotor unit and in communication with one or more recirculation inlets for receiving a recirculation stream of fluid and directing under pressure through the conduit, wherein an inside diameter and length of the conduit define a flow restriction; and one or more recirculation outlets defined in a stator unit downstream of the pump fluid intake, for delivering the recirculation stream of the fluid under pressure from the conduit and directing it at the pump fluid intake. A method is also taught for washing particulate from an intake end of a pump.

The present invention is constructed for use with oil field pumps. The disclosed fluid pump is an apparatus that can replace conventional mechanical jack pumps, which are often problematic and inefficient during use. The present invention is a down hole fluid pump, which carries fluid upward by means of, a two phase flow of a compressed gas, and fluid. The fluid may be an admixture of petroleum oil and water. The compressed gas is generally air, but other gases may be applied. The inventive pump comprises multiple air lines, which allow serial connectivity with multiple oil wells. Multiple donut shaped magnets comprise the inventive fluid pump assembly, which facilitate effective and efficient fluid pump operation.

The present invention is constructed for use with oil field pumps. The disclosed fluid pump is an apparatus that can replace conventional mechanical jack pumps, which are often problematic and inefficient during use. The present invention is a down hole fluid pump, which carries fluid upward by means of, a two phase flow of a compressed gas, and fluid. The fluid may be an admixture of petroleum oil and water. The compressed gas is generally air, but other gases may be applied. The inventive pump comprises multiple air lines, which allow serial connectivity with multiple oil wells. Multiple donut shaped magnets comprise the inventive fluid pump assembly, which facilitate effective and efficient fluid pump operation.

A device is taught for pumping fluid from a downhole reservoir up to surface. The device comprises a conduit extending through at least a portion an axial bore of the rotor unit and in communication with one or more recirculation inlets for receiving a recirculation stream of fluid and directing under pressure through the conduit, wherein an inside diameter and length of the conduit define a flow restriction; and one or more recirculation outlets defined in a stator unit downstream of the pump fluid intake, for delivering the recirculation stream of the fluid under pressure from the conduit and directing it at the pump fluid intake. A method is also taught for washing particulate from an intake end of a pump.

A hydraulic pumping system can include an actuator including a piston rod that displaces in response to pressure in the actuator, a seal assembly that seals about the piston rod and is exposed to the pressure in the actuator, and another seal assembly that seals about the piston rod, is exposed to pressure in a well and includes multiple separate seal cartridges, each of the seal cartridges including a dynamic seal that slidingly and sealingly engages the piston rod. Another hydraulic pumping system can include an actuator including a piston rod that displaces in response to pressure in the actuator, a seal assembly that seals about the piston rod and is exposed to the pressure in the actuator, and another seal assembly that seals about the piston rod, is exposed to pressure in a well and includes a labyrinth ring comprising multiple ring layers.

A method of disposing of fluids produced from a wellbore extending into a subsurface formation, the subsurface formation having a production zone and a disposal zone, at least a portion of the wellbore lined with a string of production casing. The method includes placing a wellbore tubular conduit within the casing; placing a pump in fluid communication with the wellbore tubular conduit, the pump having an inlet and a discharge, the inlet in fluid communication with a source of produced fluids; and injecting the produced fluids through a plurality of perforations positioned about the casing into a disposal zone of the subsurface formation. A system for disposing of fluids produced from a wellbore extending into a subsurface formation is also provided.

A pumping method can include displacing a rod string with pressure applied to an actuator by a pressure source including an accumulator and a separate gas volume in communication with the accumulator. A sensor indicates whether a fluid is in the gas volume. A pumping system can include an actuator, a pump connected between the actuator and an accumulator, a hydraulic fluid contacting a gas in the accumulator, a separate gas volume in communication with the accumulator, and a sensor that detects the hydraulic fluid in the gas volume. Another pumping system can include an actuator, a pump connected between the actuator and an accumulator that receives nitrogen gas from a nitrogen concentrator assembly while a hydraulic fluid flows between the pump and the actuator, a separate gas volume in communication with the accumulator, and a sensor that detects a presence of the hydraulic fluid in the gas volume.