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Since the invention of the screw pump in 1930, the technology of the screw pump has been continuously improved and improved. Especially the development of the synthetic rubber technology and the bonding technology has made the screw pump widely used in the oil exploitation. Currently in the field of polymer flooding oil, screw pump has become a commonly used artificial lift method.  composition of the screw pump system and the working principle of the pump  1. System Components  Screw pump production system mainly consists of drive, wellhead, downhole screw pump and the middle of the tubing. According to their different driving methods, can be divided into electric, hydraulic and motorized three types of screw pump production system. Ground-driven (motorized) screw pump is the most widely used, this section introduces the motor screw pump system.  motor screw pump oil production system from the bottom of the screw pump, sucker rod, sucker rod stabilizer and ground-driven system and other components.  When the principle of screw pump work, driven by the ground rod sucker rod rotation, connected to the bottom of the rod pumping rotor along with the rotation, the well liquid through the lower suction pump, discharged from the top, and out of the wellhead from the tubing, Then through the ground pipeline to the metering station.  This oil production is the most convenient way, the actual use of underground wells do not need to install the drain device, once the pump rotor from the pump cylinder, the oil casing will be connected to each other, so played a drain effect. At the same time, this device is also lower cost of use, is a shallow well oil recovery method is more desirable.  2 screw pump structure and working principle  (1) screw pump structure  Single screw pump is composed of the stator and rotor. The rotor is made of high-strength, precision-machined, chrome-plated steel; the stator is the pump barrel and is made of a solid, oil-resistant, corrosion-resistant synthetic rubber and then permanently bonded to the steel housing. In addition to single-screw pump, screw pump and more screw pump (twin screw, three screw and five screw pump, etc.), mainly for the delivery of oil.  (2) The working principle of the screw pump  Screw pump is discharged by the cavity, that is, the rotor and stator formed between the closed compartment of each other, when the rotor rotates, the closed cavity in the axial direction by the suction end To the discharge side of the direction of migration. The closed chamber disappears at the discharge end, and the crude oil in the cavity is pushed uniformly from the suction end to the discharge end. At the same time, a new low-pressure cavity is reconstructed at the suction end to suck the crude oil. In this way, the closed cavity continues to form, migrate and disappear, and the crude oil is continuously filled, squeezed and discharged, so that the crude oil in the well is continuously drawn in and lifted to the wellhead through the oil pipe.