Downhole roller vane motor and roller vane pump

Roller vane pump suitable for pumping oil and/or from a subterranean reservoir to the ground surface, or for pumping up water from a service reservoir comprising a generally tubular housing (1) and a rotor (3) mounted for rotation within said housing to define an annular space there between, said housing having radially inwardly projecting wall means (2) extending longitudinally along said housing and dividing said annular space into a plurality of chambers (6a,b) each of said chambers having a first portion (6a) and a second portion (6b) such that said first portion is upstream of said second portion viewed in a clockwise direction, said rotor having a plurality of recesses (4) therein spaced around the circumference of said rotor and extending substantially over its length, a plurality of cylindrical rollers (5) disposed in said recesses so as to be displaceable in said recesses from a generally radially projecting position into substantially sealing engagement with the housing (1) to a generally retracted position when traversing the radially extending wall means (2), there being a central conduit (10) extending axially within said rotor (3) for the entering flow of pressurized fluid there through, outlet ports (9") in said rotor (3) communicating between said central conduit (10) and said recesses (4), there being inlet ports (7") in said housing (1) at or near the front edges of said inwardly projecting wall means (2) when viewed in the clockwise direction, said inlet ports open into an annular space defined by said housing and a wall of the borehole, said recesses being substantially wider than the diameters of said roller (5) therein, the central conduit (10) in the rotor (3) being closed at its lower end, an electromotor attached to said rotor (3) for rotating said rotor to pump oil or water by the rollers (5) from the annular space (8) outside the housing (1) through the inlet ports (7") through the chambers (6a,b), the recesses (4) and the outlet ports (9") to the central conduit (10) in the rotor and further through the well tubing to the ground surface.

Roller vane pump for pumping oil and/or water from a subterranean reservoir to the ground surface or for pumping up water from a service reservoir, comprising a generally tubular housing (1) and a rotor (3') mounted for rotation within said housing to define an annular space there between, said housing having radially inwardly projecting wall means (2) extending longitudinally along said housing and dividing said annular space into a plurality of chambers (6a',b') each of said chambers having a first portion (6a') and a second portion (6b') such that said first portion is upstream of said second portion viewed in a clockwise direction, said rotor having a plurality of recesses (4') therein spaced around the circumference of said rotor and extending substantially over its length, a plurality of cylindrical rollers (5') disposed in said recesses so as to be displaceable in said recesses from a generally radially projecting position into substantially sealing engagement with the housing (1') to a generally retracted position when traversing the radially extending wall means (2'), there being a central conduit (10') extending axially within said rotor (3') for the entering flow of pressurized fluid there through, inlet ports (9') in said rotor communicating between said central conduit (10) and recesses (4'), there being outlet ports (7') in said housing (1') at or near the front edges of said inwardly projecting wall means (2') when viewed in the clockwise direction, said outlet ports open into an annular space defined by said housing and a wall of the borehole, said recesses being substantially wider than the diameters of said rollers (5') therein, such that in the use of the pump liquid is sucked in through sad inlet ports (9') from the central conduit (10') into chamber portion (6a') near the recesses (4') and is discharged through outlet ports (7') disposed at or near the front edges of the radically inwardly projecting wall means (2') when viewed in a clockwise direction to the space outside the housing (1') until said rollers (5") are forced into the retracted position by the radially inwardly projecting wall means (2') and successive rollers (5') clear the radially inwardly projecting wall means (2') and assume the extended position where upon said process is repeating whereby said central conduit (10') in the rotor (3') is closed off at its downstream, upper side.