Low temperature oil-contaminated water processing method

Abstract

The invention relates to a low-temperature oily sewage treatment method, the water temperature of which ranges between 24 and 34 DEG C. Crude oil produced fluid is processed through low-temperature demulsification to obtain oily sewage which is then transported to a waste disposal plant; an oil removal flotation agent is added in the oily sewage in a pipeline through a chemical adding device; the oil removal flotation agent and the oily sewage are mixed in a static mixer, and then enter in air flotation equipment; after air-flotation treatment, oil slick at the upper part is collected by an oil collector; then the mixed liquid is processed through suspension, sedimentation and mechanical filtration; the oil removal flotation agent can be cation polyacrylamides, or cationic polymer which is modified from polyacrylamide, or polyether deoiling agents which are generated when epoxy chloropropane reacts with fatty alcohol. The low-temperature oily sewage treatment method leads the sewage to realize that the oil in the water is less than 5mg / L and the suspended substance content is less than 5mg / L, achieves the standard of oilfield injection water, saves the energy, reduces the consumption, saves the water resource, and lowers the oil production cost.

Description

Technical field: [0001] The invention relates to a method for treating low-temperature oily sewage in an oilfield with a water temperature between 24°C and 34°C. technical background: [0002] Many oilfields in eastern my country are old oilfields that have been developed for decades. The surface gathering and transportation process is a three-pipe hot water accompanying process. There are problems such as high energy consumption of the system, backward process, aging equipment, thermal imbalance of branches and main lines, and serious corrosion. . Combined with the renewal of surface pipeline equipment, improvement of economic efficiency, and reduction of production energy consumption, old oilfields need to be adjusted and transformed. The effective technical route is to realize single-pipe non-heating gathering and transportation for off-station processes in onshore oilfields. To realize non-heating gathering and transportation, it is necessary to study and overcome the fo...

AI Technical Summary

Problems solved by technology

[0002] Many oilfields in eastern my country are old oilfields that have been developed for decades. The surface gathering and transportation process is a three-pipe hot water accompanying process. There are problems such as high energy consumption of the system, backward process, aging equipment, thermal imbalance of branches and main lines, and serious corrosion.

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