Oily sewage treatment system

Abstract

The invention provides an oily sewage treatment system. The oily sewage treatment system comprises a production separator, an air conveying line, an oil conveying line, a production water conveying line and a coalescence oil removal device, wherein the oil conveying line is provided with a first connecting point, the production water conveying line is provided with a first access point and a second access point, and a first control valve is arranged between the first access point and the second access point; the coalescence oil removal device is arranged between the first access point and thesecond access point in a bypass way, and is provided with an inlet, a water outlet and an oil collection bag; a distributor, a flow arrangement device, a coalescence separation module, and a reinforced settlement module are arranged in the coalescence oil removal device along the flowing direction of the production water; a second control valve is connected between the inlet of the coalescence oilremoval device and the first access point of the production water conveying line; a third control valve is connected between the water outlet of the coalescence oil removal device and the second access point of the production water conveying line; a fourth control valve is connected between the oil collection bag of the coalescence oil removal device and the first connecting point of the oil conveying line.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an oily sewage treatment system. Background technique [0002] The incoming fluid from the downhole production manifold in land oilfields is a three-phase mixture of water, oil and gas at high temperature and high pressure. The oil is discharged to the oil recovery tank, the gas is sent to the heat exchanger, and the separated production water enters the buffer tank after deoiling treatment, and then is pumped back to the production liquid header, and the oil in the production water is discharged to the production liquid header. The content must meet the corresponding environmental standards. [0003] Since the produced product undergoes severe emulsification during the process of phase change during cooling by the heat exchanger, water-in-oil and oil-in-water emulsions are formed, while the separation of oil and water in the production separator is simply gravity Settling or en...

AI Technical Summary

Problems solved by technology

[0004] As oilfield exploitation enters the middle stage, the downhole pressure decreases, the produced product and production operation pressure decrease, and the gas phase flow rate increases. The emulsification phenomenon caused by the heat exchange phase change and pipeline transmission process is more serious, which exceeds the existing technology and equipment. Separation ability, resulting in the oil content of the purified production water discharged from the production water transmission line exceeding the standard

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