Double-tube two-stage axial flow downhole degassing device

Abstract

The invention provides a double-tube type two-stage axial flow downhole degassing device, which is installed between an oil well pump and a screen pipe, and is firstly used for gas-liquid two-phase separation before the output liquid of an oil and gas well enters the pump. Based on its double-tube special structure and two-stage axial flow technology, the degassing device realizes the separation of output liquid, gas and liquid, thereby improving the efficiency of the mechanical mining system; the liquid inlet keeps the screen tube and the inner liquid cylinder connected, and realizes the The speed of the produced liquid is increased; the axial flow tube assembly implements two-stage axial flow gas-liquid separation, and the axial flow tube adopts a standardized and block design to ensure efficient and thorough degassing of the produced liquid; the inner liquid cylinder ensures that the produced liquid Inject into the axial flow tube at a high initial velocity, and form a double-tube annular space together with the outer liquid cylinder, and transport the degassed liquid of the axial flow tube; the degassed liquid is first reversely integrated into a steady flow by the rectifier, and then It is discharged into the outer liquid cylinder by the drainer, and finally sent to the oil well pump after being accelerated by the deflector, and the gas is decelerated and boosted by the exhauster that can avoid backflow, and then discharged into the wellbore.

Description

Technical field [0001] The invention is suitable for downhole degassing devices of oil and gas wells and unconventional gas wells, and particularly relates to a device for separating gas and oil, gas, oil and water or gas and water before the produced liquid is pumped. Background technique [0002] In the pumping system of oil and gas wells, the efficiency of downhole pumps plays a key role in the efficiency of the entire system. During the production operation of oil and gas wells, it is inevitable that the gas in the downhole produced fluid will be pumped together with the liquid. The existence of these gases directly leads to the low efficiency of the pumping system; in addition, for the pumping of oil and gas wells with high gas-to-liquid ratio In the oil process, if the necessary degassing measures are not adopted, it is easy to cause a large amount of gas to enter the oil pump before the gas-liquid two-phase produced liquid is sufficiently separated, which causes the occurr...

AI Technical Summary

Problems solved by technology

[0004] In summary, foreign downhole gas-liquid separation and reinjection technologies have many problems such as limited performance and difficult manufacturing, while domestic research is only in the ground test stage

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