Gas-liquid separation device and separation method for electric submersible pump

Abstract

The invention discloses a gas-liquid separation device and a separation method for a submersible electric pump, wherein the gas-liquid separation device comprises a separator main body, a slip, a fishing mechanism and a gas collecting mechanism, wherein the separator main body comprises a mandrel, a conical seat and a central pipe from top to bottom. The central tube is further provided with blades, a spiral channel extending spirally in the vertical direction is formed between the blades and the outer wall surface of the central tube, and the central tube is provided with a constant diameterportion and a gradual contractile portion connected with the lower end of the constant diameter portion. The cross-sectional area of the constant diameter portion is constant, and the cross-sectionalarea of the gradual contractile portion gradually decreases from top to bottom. The slip can fit with the conical seat, the mandrel is sleeved with the fishing mechanism, and a diversion channel whichis in communication with the spiral channel is arranged between the fishing mechanism and the mandrel. A collecting opening of the gas collecting mechanism is adjacent to the upper portion of the mandrel, and is isolated from an inlet of the submersible electric pump. The gas-liquid separation device and the separation method for the submersible electric pump have better performance.

Description

technical field [0001] The invention relates to the field of oil well gas-liquid separation, in particular to a gas-liquid separation device and a separation method for a submersible electric pump. Background technique [0002] Electric submersible pumps have the characteristics of large displacement, high head, and high degree of automation, and have been widely used in oil fields at home and abroad. When the electric submersible pump pumps gas-liquid mixed fluid, the gas entering the pump will occupy a certain space of the centrifugal pump, which will cause the characteristic curve of the submersible electric pump to deviate, the head, displacement and efficiency of the pump will decrease, and the current fluctuation will intensify when the motor is running. The production is not stable, and when it is serious, it will cause air lock, cavitation and other phenomena, and its lifting effect will be seriously affected. [0003] At present, the oil production system of electr...

AI Technical Summary

Problems solved by technology

However, at present, the separation load range of the rotary separator is narrow, and the separation efficiency drops sharply after the maximum gas-liquid ratio is exceeded. In severe cases, air resistance occurs, and a large amount of gas is stirred and broken between the blades, resulting in uneven force on the blades and vibration of the device. Shorten stable working time and frequent maintenance

In addition, the flow of downhole liquid creates great resistance to the rotary separator, and the energy consumption increases sharply

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