Treatment device and treatment method for CO2 flooding produced water

Abstract

The invention discloses a treatment device and a treatment method for CO2 flooding produced water. The device comprises a test device main box body, a plurality of hollow ventilation test columns arearranged in the test device main box body, a water inlet is arranged at the top of each ventilation test column, a sewage sampling port is arranged at the bottom of each ventilation test column, an electromagnetic coil is wound on the surface of the outer wall of each ventilation test column, and an aeration head is arranged below the internal of each ventilation test column. The treatment devicehas the characteristics of high flexibility, small occupied area and good scale prevention and corrosion control treatment effects, and can be used for effectively carrying out oil removal, scale removal and corrosion control treatment on CO2 flooding produced water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method of using frequency conversion electromagnetic magnetization and aeration as CO 2 The treatment device of the flooding water treatment method, and the treatment of CO by this device 2 A method of flooding produced water for treatment. Background technique [0002] During oil field development, different oil displacement methods such as water flooding, polymer flooding, and ASP flooding are used for oil displacement. Specifically, oil displacement is: injecting water and oil displacement agent into the ground through the injection well. Since the oil displacement agent can improve the thickening ability of crude oil and reduce the interfacial tension of crude oil, it has the ability to wash oil, thereby dissolving the crude oil in the formation. ,carry. In this process, the oil-displacing agent and crude oil form an oil-water-gas mixture (ie, production fluid), ...

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Problems solved by technology

[0005] However, at present, there is no treatment system dedicated to the produced water of carbon dioxide flooding in oilfields. The produced water from carbon dioxide flooding is mixed with the produced water from water flooding and then treated by the water flooding produced water treatment system

For the water flooding produced water treatment system, this is equivalent to increasing the carbon dioxide content in the water flooding produced water, which will lead to frequent scaling and corrosion under the scale of the treatment equipment, which in turn will cause a large number of pipelines and water treatment equipment for produced water. Corrosion and perforation, can not be used normally

It can be seen that the original water flooding equipment can no longer adapt to the carbon dioxide flooding produced water in terms of scaling and corrosion.

In addition, the treatment system of conventional water flooding produced water occupies a large area, and the treatment process (natural settlement + coagulation settlement + quartz sand filtration and other physical methods and / or chemical methods such as scale inhibitors and corrosion inhibitors) has poor flexibility , Corrosion control and descaling effects are poor, and the cost of chemicals is high. After use, it may cause secondary pollution to the surrounding environment. It is difficult to meet normal production and environmental protection requirements such as oilfield anti-scaling, corrosion control, and reducing the frequency of equipment and pipeline replacement.

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