The petroleum industry includes two parts: oil extraction and oil refining. Extraction of underground oil, there are "self-spraying oil extraction", "gas lift oil extraction" and "mechanical oil extraction" and other methods. When the bottom of the oil well pressure to reach the conditions of self-injection, the bottom of the well oil can only rise to a certain height, there is still a distance from the wellhead, it is necessary to inject gas from the casing and tubing between the annular space into the well, so that the petroleum fluid is pressed into the tubing and lifted to the ground, this method of oil extraction is called "gas lift oil extraction". Centrifugal compressor is used in oilfield gas injection process, this compressor has high pressure, high power and high speed.
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