Wellbore conveyor device

Abstract

The present invention refers to a wellbore conveyor device for conveying a medium ( 9 ) from a wellbore ( 8 ), comprising: a drive ( 2 ); a pump ( 3 ); a shaft ( 4 ) which connects the drive ( 2 ) to the pump ( 3 ); a mechanical seal unit ( 5 ), comprising a mechanical seal ( 50 ) with a rotating seal ring ( 51 ) and a stationary seal ring ( 52 ), the mechanical seal ( 50 ) sealing on the shaft ( 4 ); and an independent supply means ( 6 ) which supplies the mechanical seal ( 50 ) with a barrier medium, the independent supply means ( 6 ), the drive ( 2 ), the pump ( 3 ), the shaft ( 4 ) and the mechanical seal unit ( 5 ) forming a compact conveying unit which is fully submersible in the wellbore.

1 . Wellbore conveyor device for conveying a medium from a wellbore, comprising:
 a drive;   a pump;   a shaft which connects the drive to the pump;   a mechanical seal unit, including a mechanical seal with a rotating seal ring and a stationary seal ring, the mechanical seal sealing on the shaft; and   an independent supply means which supplies the mechanical seal with a barrier medium;   the independent supply means, the drive, the pump, the shaft and the mechanical seal unit forming a compact conveying unit which is fully submersible in the wellbore.   
     
     
         2 . Device according to  claim 1 , wherein the independent supply means is arranged at an end of the compact conveying unit. 
     
     
         3 . Device according to  claim 1 , wherein the drive is arranged in axial direction (X-X) of the wellbore conveyor device between the independent supply means and the mechanical seal unit. 
     
     
         4 . Device according to  claim 1 , wherein the independent supply means comprises a first chamber for receiving the barrier medium, a second chamber which is connected to an outside of the wellbore conveyor device, so that a pressure corresponding to the pressure of the medium to be conveyed prevails in the second chamber, and a bellows which separates the first chamber from the second chamber in a media-tight manner. 
     
     
         5 . Device according to  claim 4 , further comprising a piston element which is arranged on the bellows so the bellows and the piston element form a cup-shaped unit, the first chamber is arranged in the interior of the cup-shaped unit, and the second chamber is arranged between the outside of the cup-shaped unit and a housing of the independent supply means. 
     
     
         6 . Device according to  claim 4 , wherein the independent supply means further comprises a biasing element for permanently biasing the barrier medium in the first chamber. 
     
     
         7 . Device according to  claim 1 , wherein the drive is an electric drive. 
     
     
         8 . Device according to  claim 7 , further comprising a connection line which connects the independent supply means to the mechanical seal unit, the connection line extending through the electric drive ( 2 ). 
     
     
         9 . Device according to  claim 4  wherein the independent supply means further comprises a third chamber, the third chamber being sealed in a media-tight manner relative to the first and second chamber. 
     
     
         10 . Device according to  claim 9 , wherein a third pressure (P 3 ) in the third chamber is equal to or greater than a first pressure (P 1 ) in the first chamber and equal to or greater than a second pressure (P 2 ) in the second chamber and/or that the third chamber surrounds the first chamber and/or the second chamber. 
     
     
         11 . Device according to  claim 1 , further comprising a separator for separating gaseous constituents from the medium to be conveyed, the separator being integrated into the compact conveying unit.