The submersible electric centrifugal pump is composed of three parts: the underground part, the ground part and the middle part of the underground and the ground.
The underground part is the main unit of submersible electric centrifugal pump, which is composed of four parts, which are multi-stage centrifugal pump, oil and gas separator, protector and submersible motor. Is the main pumping equipment. The assembling method is: multistage centrifugal pump in the upper part of oil and gas separator, protector of submersible motor in the middle, in the lower part, if necessary, the connection test device can also be in the lower part of submersible motor, such as pressure gauge connection, in order to grasp the situation of underground pressure.
The ground part is composed of control panel, transformer and auxiliary equipment. Control panel can be used for manual or automatic switch to control the submersible electric pump work, while protecting the submersible motor, to prevent the motor, cable system short-circuit and motor overload. The transformer is used to increase the power network voltage (380 V) to the voltage required by the motor to work. Auxiliary equipment including cable roller, guide wheel and wellhead bearing, etc..
The middle part is composed of a special structure of cable and tubing, which is transported from the ground to the underground. Two kinds of cable, round and flat cable. In the underground, the round cable and the oil pipe are fixed together, and the flat cable is fixed together with a pump, a separator and a protector. The flat cable is used to reduce the size of the set, and the cable is fixed on the oil pipe, the pump, the separator and the protector with the steel band.
Submersible electric centrifugal pump is powered by the ground power through the transformer, control panel and cable, the power transmission to the downhole submersible motor, so that the submersible motor driven multi-stage centrifugal pump rotation, the crude oil to the ground up.
Multistage centrifugal pump working principle and ground centrifugal pump, when the impeller rotates at a high speed motor drive shaft, full of liquid in the impeller under the action of centrifugal force from the impeller center along the flow between the leaves thrown to the impeller around. Because the liquid is subjected to the action of the blade, the pressure and the speed increase simultaneously, and the impeller is led to the second stage through the guide shell passage. In this way, all of the impeller and the guide shell are passed through, which further increases the pressure energy of the liquid. After each impeller step by step, it will get a certain lift, the underground liquid will be lifted to the ground.
