Oil-water separation process for high-oil-content emulsified produced water

Abstract

The invention provides an oil-water separation process for high-oil-content emulsified produced water. Separated high-oil-content emulsified produced water in a gas collection station is stored in a buried sewage tank, oil-water separation of floating oil easy to separate is completed through natural sedimentation, produced water enters and exits from a produced water treatment station in an automobile transportation mode, demulsification is conducted by adding a low-temperature demulsifier, oil-water separation is completed under the cooperation of an oil-water separator and a three-phase separator, and the treated produced water enters an in-station produced water treatment system, and is treated and reinjected. The problem that oil and water are transported together without a gatheringand transportation pipe network is solved, light oil prone to floating in the gas collection station is pulled away, water is gathered and transported nearby, and the operation cost is saved. The oil-water separator and the three-phase separator are arranged in the produced water treatment station, so that the problem of high-oil-content emulsified produced water treatment is solved, floating oiland most emulsified oil in produced water are further removed through two-stage demulsifying oil-water separation, the oil content of the produced water is less than 0.1%, and the subsequent treatmentload is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of gas field produced water treatment, and in particular relates to an oil-water separation process for highly oily emulsified produced water. Background technique [0002] The oil content in the produced water in the Sulige area is relatively high, ranging from 8 to 32% by volume. With the gas field drainage and gas recovery measures, high molecular substances such as foam drainage agents and corrosion inhibitors enter the produced water, forming a large amount of three-phase emulsion of oil, water and mud. [0003] At present, sedimentation and oil removal tanks are used in the station to separate dirty oil. The water entering the station has high oil content and serious emulsification. It is difficult to separate oil and water in static sedimentation, which seriously affects the normal operation of the produced water treatment system in the downstream processing station. [0004] In the prior art, the pr...

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Problems solved by technology

[0005] However, there are at least the following problems in the prior art: during the air flotation process, most of the oil and suspended matter adhere to the air bubbles, and during the movement of the air bubbles, it is easy to make the oil and suspended matter come into contact with the ions that are easy to scale. Scaling in the air flotation treatment equipment, or even damage to the air flotation treatment equipment

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