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Method for treating oil extraction wastewater of oilfield

A technology for oil extraction wastewater and treatment method, which is applied in biological water/sewage treatment, illumination water/sewage treatment, water/sewage multi-stage treatment, etc. problems, to achieve the effect of optimizing the wastewater treatment process, reducing the cost of wastewater, and simplifying the process of wastewater treatment

Inactive Publication Date: 2019-04-09
北京鑫晟环能科技发展有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent discloses an oilfield wastewater treatment process. However, the oilfield wastewater treatment process is complex, the treated water quality is poor, and the cost of treating water quality is high, which cannot meet market demand.

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  • Method for treating oil extraction wastewater of oilfield

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Embodiment 1

[0027] At present, the oil production sewage is extracted from the oil layer together with the crude oil, and then goes through the whole process of crude oil collection and primary processing. This wastewater has the following characteristics:

[0028] (1) The water temperature is high. Generally, the sewage temperature is around 50 degrees. Individual oilfields are different, such as 60-70 degrees in the northern oilfield, and about 30 degrees in the northwest oilfield.

[0029] (2) High degree of mineralization. Different oil fields and different sewage treatment stations in the same oil field have great differences in salinity, ranging from hundreds of milligrams per liter to hundreds of thousands of milligrams per liter.

[0030] (3) A certain amount of gas is dissolved. Such as oxygen, carbon dioxide, hydrogen sulfide, etc., as well as organic matter such as some naphthenic acids.

[0031] (4) Contains a certain amount of suspended solids. Such as mud and sand: inc...

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Abstract

The invention discloses a method for treating oil extraction wastewater of an oilfield. The method comprises the following steps: (1) injecting wastewater into an adjustment pond with oilfield flooding to gather wastewater and adjust water quality; (2) feeding the adjusted wastewater into a facultative tank, performing hydrolytic acidification on the wastewater; (3) feeding the wastewater treatedin the step (2) into an aerobic tank, performing aerobic breathing on the active sludge in the wastewater to remove pollutants; (4) feeding the wastewater treated in the step (3) into an MBR membranetank, separating sewage and sludge of the wastewater; (5) filtering the water quality treated in the step (4); (6) feeding the filtered water quality into a clear water tank; and (7) sterilizing and disinfecting the water quality injected into the clear water tank. The invention aims at providing a wastewater treatment method with simple flow, the water quality can reach standard after treatment,the wastewater treatment flow can be simplified, and the production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater, in particular to a method for treating oilfield wastewater from oil production. Background technique [0002] Because oilfield sewage contains the above-mentioned harmful substances, if it is discharged without treatment, it will have a serious impact on the environment: the crude oil floating on the water will isolate the air, reduce the dissolved oxygen in the water, and adhere to the surface of aquatic organisms and the respiratory system , killing it. Anaerobic decomposition of oil deposited on the bottom of the water will produce highly toxic hydrogen sulfide. Heavy crude oil adheres to the sediment, which will affect the habitat and reproduction of aquatic organisms; oilfield sewage contains some highly toxic organic substances, which will pollute water bodies and soil; organic and inorganic substances in oilfield sewage are eutrophic for bacteria in water As a result, the water qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/32C02F3/1268C02F3/30C02F9/00C02F2001/007C02F2303/04
Inventor 唐安中张志海张诚
Owner 北京鑫晟环能科技发展有限公司
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