Machine and pump integrated all-metal screw pump oil extraction device with external rotor

Abstract

The invention relates to a screw pump oil extraction device, in particular to a machine and pump integrated all-metal screw pump oil extraction device with an external rotor, and belongs to the technical field of oil extraction machinery. The device comprises a shell, a machine-pump integrated all-metal screw pump located in the shell, a dynamic seal located at the lower end of the machine-pump integrated all-metal screw pump and a motion conversion mechanism located at the lower end of the dynamic seal. According to the machine and pump integrated all-metal screw pump oil extraction device with the external rotor, the whole length of a unit is reduced through integrated arrangement of a machine and a pump, so that the trafficability of medium and short curvature radius horizontal well deflecting sections is improved, so that the situations that the unit is stuck due to scaling and the drilling and well repairing cannot be carried out due to overlong underground use time are avoided; meanwhile, by the adoption of the all-metal screw pump, the device can be suitable for the heavy oil thermal recovery working condition; and besides, the motion conversion mechanism can realize self cooling and lubrication while completing conversion of fixed-axis rotation of a motor rotor into eccentric rotation of a screw pump rotor relative to a screw pump bushing, so that the service life of the motion conversion mechanism is greatly prolonged.

Description

technical field [0001] The invention relates to a screw pump oil extraction device, in particular to an all-metal screw pump oil extraction device with an external rotor and an integrated pump, belonging to the technical field of oil extraction machinery. Background technique [0002] In recent years, low-speed high-torque submersible permanent magnet synchronous motors directly drive screw pumps for oil production as a new technology, which has been gradually applied in oil fields. The transmission mode of the system has changed, and the planetary gear reducer and its protector are omitted. The working principle is as follows: : The submersible permanent magnet synchronous motor is installed at the bottom of the downhole system, on which is a motor protector, and the protector shaft is connected with the rotor of the screw pump, thereby completing the oil extraction operation directly driven by the motor. Although the low-speed high-torque submersible permanent magnet synch...

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Problems solved by technology

At present, there are unconventional oil reservoirs with considerable reserves in the world that can be lifted efficiently through heavy oil thermal recovery methods such as steam injection, electric heating, and solvent injection. The severe deformation occurs within a short period of time, which leads to failure and makes the screw pump unable to complete the lifting task. Therefore, the screw pump of the existing submersible direct drive screw pump device cannot be applied to the thermal recovery of heavy oil.

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