Rotary Hydraulic Pump with ESP Motor

Abstract

A submersible pumping system includes an electric motor and a pump driven by the electric motor. The pump includes a rotatable shaft driven by the motor, one or more piston assemblies configured for linear reciprocating motion and a mechanism for converting the rotational movement of the shaft to linear reciprocating movement in the piston assemblies. In one aspect, the mechanism for converting the rotational movement of the shaft includes a tilt disc assembly. In another aspect, the mechanism for converting the rotational movement of the shaft includes a camshaft assembly.

What is claimed is: 
     
         1 . A submersible pumping system comprising:
 an electric motor; and   a pump driven by the electric motor, wherein the pump comprises:
 a shaft driven by the motor configured for rotational movement; 
 one or more piston assemblies configured for linear reciprocating movement; and 
 wherein the reciprocating pistons are configured to linearly reciprocate in response to the rotational movement of the shaft. 
   
     
     
         2 . The submersible pumping system of  claim 1 , wherein the pump further comprises a tilt disc connected to the reciprocating pistons and to the shaft, wherein the tilt disc assembly converts the rotational movement of the shaft into the linearly reciprocating motion of the reciprocating pistons. 
     
     
         3 . The submersible pumping system of  claim 2 , wherein the tilt disc assembly further comprises:
 a drive plate; and   a rocker plate.   
     
     
         4 . The submersible pumping system of  claim 3 , wherein the drive plate is connected to the rotating shaft at a non-perpendicular angle. 
     
     
         5 . The submersible pumping system of  claim 4 , wherein the rocker plate is adjacent to the drive plate. 
     
     
         6 . The submersible pumping system of  claim 5 , wherein the rocker plate does not rotate with the shaft. 
     
     
         7 . The submersible pumping system of  claim 6 , wherein the rocker plate further comprises:
 a central bearing; and   one or more piston rod recesses.   
     
     
         8 . The submersible pumping system of  claim 2 , wherein the pump further comprises a cylinder block and wherein the cylinder block comprises:
 one or more intake ports;   an intake valve in each of the one or more intake ports; and   a discharge valve in each of the one or more cylinders.   
     
     
         9 . The submersible pumping system of  claim 1 , wherein the pump further comprises a camshaft assembly, wherein the camshaft assembly converts the rotational movement of the shaft into the linearly reciprocating motion of the reciprocating pistons. 
     
     
         10 . The submersible pumping system of  claim 9 , wherein the camshaft assembly comprises:
 a camshaft;   a plurality of lobes on the camshaft; and   a plurality of connecting rods connected between the lobes on the camshaft and the piston assemblies.   
     
     
         11 . The submersible pumping system of  claim 10 , wherein the pump comprises a plurality of cylinders, wherein each of the piston assemblies reciprocates within a within a separate one of the plurality of cylinders. 
     
     
         12 . The submersible pumping system of  claim 11 , wherein the pump further comprises a plurality of manifolds, wherein each of the plurality of cylinders intersects a manifold 
     
     
         13 . The submersible pumping system of  claim 12 , wherein the pump further comprises a plurality of check valves within each of the plurality of manifolds. 
     
     
         14 . The submersible pumping system of  claim 12 , wherein the lobes on the camshaft have a stepped profile that causes the piston assemblies to sequentially reciprocate in a manner that produces a progressive cavity within each of the plurality of manifolds. 
     
     
         15 . The submersible pumping system of  claim 1 , further comprising a seal section positioned between the pump and the motor. 
     
     
         16 . A pump useable within a submersible pumping system, the pump comprising:
 a cylinder block, wherein the cylinder block includes a plurality of cylinders;   a rotatable shaft;   a tilt disc assembly, wherein the tilt disc assembly comprises:
 a drive plate connected to the rotatable shaft and configured for rotation with the shaft; and 
 a rocker plate that is not configured for rotation with the shaft; and 
   a plurality of piston assemblies, wherein each of the plurality of piston assemblies comprises:
 a plunger that is configured for reciprocating linear motion in a corresponding one of the plurality of cylinders; and 
 a piston rod connected to the plunger and to the rocker plate. 
   
     
     
         17 . The pump of  claim 16 , wherein the cylinder block further comprises:
 a plurality of intake ports;   an intake valve in each of the plurality of intake ports; and   a discharge valve in each of the plurality of cylinders.   
     
     
         18 . A pump useable within a submersible pumping system, the pump comprising:
 a plurality of manifolds;   a plurality of banks of cylinders, wherein each of the plurality of banks of cylinders corresponds to a separate one of the plurality of manifolds;   a plurality of cylinders within each of the plurality of banks of cylinders, wherein each of the plurality of cylinders is in fluid communication with the corresponding one of the plurality of manifolds;   a rotatable camshaft; and   a plurality of pistons assemblies, wherein each of the piston assemblies comprises:
 a piston, wherein each piston is located within a separate one of the plurality of cylinders; and 
 a connecting rod, wherein the connecting rod connects the piston to the camshaft. 
   
     
     
         19 . The pump of  claim 18 , wherein the pump further comprises a plurality of check valves within each of the plurality of manifolds. 
     
     
         20 . The pump of  claim 18 , wherein the camshaft has a stepped profile that causes the piston assemblies to sequentially reciprocate in a manner that produces a progressive cavity within each of the plurality of manifolds.