Reciprocating downhole pump

Abstract

A reciprocating downhole pump for use in a subterranean well for lifting produced fluids to the surface. The reciprocating downhole pump is inverted in that the pump has a pump cylinder with an upper part and a lower part, wherein the upper part is configured for connection to a production tubing and the lower part is configured for receiving energy to drive the pump. A pump piston and a pump intake is arranged above the pump piston. The pump has one or more standing valves arranged above the pump piston. The pump is driven by a hydraulic piston rod.

1 . A reciprocating downhole pump for use in a subterranean well for lifting produced fluids to the surface, the reciprocating downhole pump comprising a pump cylinder comprising an upper part and a lower part, wherein the upper part is configured for connection to a production tubing and the lower part is configured for receiving energy to drive the pump;
 a pump piston;   a pump intake arranged above the pump piston; and   one or more standing valves arranged above the pump piston.   
     
     
         2 . The reciprocating downhole pump of  claim 1 , wherein the pump intake is equipped with one or more radial standing valves. 
     
     
         3 . The reciprocating downhole pump of  claim 1 , wherein the pump piston is supported by an energy storing unit. 
     
     
         4 . The reciprocating downhole pump of  claim 1 , wherein the pump piston is equipped with a pump shaft. 
     
     
         5 . A reciprocating downhole pump for use in a subterranean well for lifting produced fluids to surface, the reciprocating downhole pump comprising:
 a pump cylinder comprising an upper part and a lower part, wherein the upper part is configured for connection to a production tubing and the lower part is configured for receiving energy to drive the pump;   an inlet/outlet for wellbore fluids;   a pump piston equipped with one or more traveling valves;   one or more standing valves arranged above the pump piston;   wherein the pump piston is located above the inlet/outlet for wellbore fluids.   
     
     
         6 . The reciprocating downhole pump of  claim 5 , wherein the pump piston is supported by an energy storing unit. 
     
     
         7 . The reciprocating downhole pump of  claim 5 , wherein the pump piston is equipped with a pump shaft. 
     
     
         8 . A pump system for operation in a subterranean well with any deviation between 0 degrees and 90 degrees, wherein the system comprises:
 a reciprocating downhole pump according to any of the preceding  claims 1 - 7 ; and   a hydraulic pipe providing a confined space for a hydraulic pump rod driving the reciprocating downhole pump, wherein the hydraulic pipe is connected to a lower part of the reciprocating downhole pump below the pump piston.   
     
     
         9 . The system according to  claim 8 , wherein the hydraulic pump rod is configured to generate the reciprocating movement of the pump piston. 
     
     
         10 . The system according to  claim 8 , wherein the pump piston is equipped with a pump shaft and wherein the lower end of the pump shaft is attached to a lower displacement body of the hydraulic pump rod. 
     
     
         11 . The system according to  claim 8 , wherein the hydraulic pipe is equipped with an inlet/outlet for wellbore fluids.