Intelligent control device and operation method of downhole direct drive screw pump

Abstract

The invention discloses an intelligent control device for a down-hole direct-driven screw pump and an operation method thereof. The intelligent control device is designed for intelligent control of a screw pump and improvement of production efficiency. A pressure transducer, a protector and a down-hole direct-driven motor are arranged below and connected with a pump suction inlet of the device, wherein the motor is connected with a ground intelligent control unit through a signal cable. The intelligent control device can be manually operated, started and stopped and is capable of realizing adjustment of a rotating speed and displacement; in automatic operation, basic production parameters of the screw pump should be input in advance, and then a minimum submergence pressure value and a restart pressure value are set according to a differential pressure range in production of an oil well; and in production, the depth of a working fluid level, submergence and total fluid volume of an oil reservoir can be obtained through acquisition of the basic parameters of the oil well in real time, and then the rotating speed of the motor and the displacement of the pump are adjusted. With the intelligent control device and the operation method thereof in the invention, the screw pump and the direct-driven motor are protected from damage; the frequency of workover treatment is reduced; production efficiency is improved; energy is saved; consumption and operation cost are reduced; and intelligent oil extraction is realized.

Description

technical field [0001] The invention relates to an intelligent control device of an underground direct-drive screw pump and an operation method thereof, and belongs to the technical field of oil extraction in the petroleum and natural gas industry. Background technique [0002] Downhole direct-drive screw pump oil production technology is a technology that has been developed and applied rapidly in recent years. It is suitable for the production of general oil wells and high-viscosity, high-sandy oil wells. It does not require sucker rods, and there is no problem of partial wear of tubing rods. Due to low permeability or reservoirs developed in the middle and late stages, the formation fluid supply capacity is insufficient, the fluid production rate of the oil well is low, the dynamic fluid level is deep and the submergence degree is small. If the pump fails to pump liquid, the stator and rotor inside the pump will be dry-grinded, which will damage the screw pump and even bur...

AI Technical Summary

Problems solved by technology

Due to low permeability or reservoirs developed in the middle and late stages, the formation fluid supply capacity is insufficient, the fluid production rate of the oil well is low, the dynamic fluid level is deep and the submergence degree is small. If the pump cannot pump liquid, the stator and rotor inside the pump will be dry-grinded, which will damage the screw pump and even burn out the motor.

The existing current protection and other devices only start the protection after dry grinding occurs, and cannot predict the protection in advance

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