Crude Oil Lifting System and Method Utilizing Vane Pump for Conveying Fluid

Abstract

A crude oil lifting system and a method utilizing a vane pump for conveying a fluid. The crude oil lifting system comprises: an oil pipe and an oil pump connected to the oil pipe. The oil pump is the vane pump. The vane pump is provided with a cylindrical stator. The stator has arranged therein a drive shaft and a rator sleeved onto the drive shaft. The drive shaft is arranged within the stator along the direction parallel to the length of the stator. An intake plate is arranged at the lower end of the stator. A discharge plate is arranged at the upper end of the stator. The intake plate, the discharge plate, and the stator form a cylindrical cavity. The rotor is arranged between the intake plate and the discharge plate. An intake opening for taking in the crude oil is arranged on the intake plate. A discharge opening for discharging the crude oil is arranged on the discharge plate. The method utilizing the vane pump for conveying the fluid performs lifting by taking in and discharging the fluid in the directions of the ends of the stator.

1 . A crude oil lifting system, characterized in that it comprises a oil pipe and a oil well pump connected to the oil pipe, said oil well pump is a vane pump, said vane pump comprises a plurality of tube shaped stators successively engaged with one another from bottom to top according to a direction from head to tail, a driving shaft provided through the plurality of stators parallel to the length direction of the plurality of stators, at the lower end of each said stator is provided with a suction disc, and at the upper end of each stator is provided with a discharging disc, each said stator forms a tube shaped inner chamber with adjacent suction disc and discharging disc, in each inner chamber is provided with a rotor encasing said driving shaft, said rotor is located between said suction disc and said discharging disc, on said suction disc is arranged a suction inlet for sucking crude oil, and on said discharging disc is arranged a discharging outlet for discharging crude oil, wherein between the two adjacent stators, the discharging disc for a lower stator simultaneously acts as the suction disc for the upper stator, and the discharging outlet for the lower stator simultaneously acts as the suction inlet for the upper stator, said vane pump has a channel for conveying fluid from bottom to top, and the channel for conveying fluid is located in the inner chamber of each said tube shaped stator. 
     
     
         2 . The crude oil lifting system according to  claim 1 , characterized in that each said rotor is provided with vanes along the circumferential direction, in each said stator, said vanes contact seal the inner chamber of said stator, said vane pump also includes a tube shaped pump case arranged to encase the outside of the plurality of stators, each said suction disc and discharging disc are respectively provided with a shaft hole through which said driving shaft pass, in each said shaft hole provided with a bearing, each said suction disc and discharging disc are all located in the pump case and are respectively connected to the driving shaft via a bearing. 
     
     
         3 . The crude oil lifting system according to  claim 1 , characterized in that said vane pump is connected under said oil pipe, and said vane pump is anchored on the inner wall of the oil layer casing pipe through an anchor. 
     
     
         4 . The crude oil lifting system according to  claim 1 , characterized in that said crude oil lifting system also comprises a Christmas tree provided at the well head of the oil well, a driving head supported and fixed on the Christmas tree and located on the top of the oil pipe, a sucker rod reaching into said oil pipe and connected between the driving head and the driving shaft of said vane pump. 
     
     
         5 . The crude oil lifting system according to  claim 1 , characterized in that each said stator has two suction inlets and two discharging outlets. 
     
     
         6 . The crude oil lifting system according to  claim 1 , characterized in that the number of said stator is two. 
     
     
         7 . A method for conveying fluid using vane pump, said vane pump has a tube shaped stator, in said stator is provided with a driving shaft, characterized in that said method for conveying fluid using vane pump carries out the suction and discharging of the fluid from the end direction of said stator so as to perform lifting, a plurality of tube shaped stators are arranged in said vane pump, and are successively engaged from bottom to top according to a direction from head to tail, each said stator performs the suction and discharging of fluid from the end direction of said stator in order to perform lifting, the fluid is sucked into the vane pump by the lowest stator and discharged out of the vane pump by the highest stator, between two adjacent stators, the fluid discharged from the lower stator is sucked into the upper stator, the fluid sucked by the upper stator is sucked in the stator above the upper stator such that a suction and discharging relay is formed until the fluid sucked is discharged by the highest stator. 
     
     
         8 . The method for conveying fluid using vane pump, characterized in that each said stator uses two suction inlets to sucking fluid, and uses two discharging outlets to discharging fluid.