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Treatment method and equipment for oilfield produced water

A technology of treatment equipment and treatment methods, applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of secondary pollution, high labor intensity, poor safety, etc. Reduce the impact on the environment, the equipment occupies a small area, and achieve the effect of recycling

Active Publication Date: 2012-12-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, oily sewage is treated by oil separation, dosing, demulsification, coagulation, precipitation (or air flotation), filtration and strong oxidation, supplemented by scale inhibition, corrosion inhibition, sterilization, or membrane treatment. The method is complicated, the recovery rate of oil is low, it is easy to clog, the amount of sludge is large, the labor intensity is high, the safety is poor, the cost of chemicals is high, membrane fouling is easy to occur, and there are problems such as secondary pollution.

Method used

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  • Treatment method and equipment for oilfield produced water
  • Treatment method and equipment for oilfield produced water
  • Treatment method and equipment for oilfield produced water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] as per figure 1 The process shown is for the treatment of the produced water in the oil field. The oil content of the oilfield produced water is 2300mg / L.

[0112] 1) Demulsification treatment

[0113] The produced water from the oil field is input into the raw sewage regulating tank 1, and the produced water is left standing in the regulating tank 1 to initially remove the sediment and part of the oil slick in the sewage, and then the effluent from the regulating tank is input into the demulsification reaction tank 3 through the flow meter 12;

[0114] The demulsifier polyaluminum chloride flows out from the demulsifier tank 2, and is sent into the demulsification reaction tank 3 through the flow meter 12, and is mixed with the produced water of the oil field to perform demulsification reaction, and the emulsified oil in the sewage is demulsified to make the demulsification in the produced water The oil phase and the water phase are separated from each other to obtai...

Embodiment 2

[0128] During the demulsification process, the demulsification agent polyaluminum chloride was used in an amount of 50 mg / L oilfield produced water, and the demulsification reaction time was 30 minutes, and the rest was the same as that of Example 1.

[0129] During the cyclone separation process, the first stage cyclone separator 4 ( Figure 4 shown) includes a water inlet pipe 401, a swirl pipe 40, an oil overflow pipe 41 and an underflow pipe 42, wherein the swirl pipe 40 is composed of a cylindrical pipe 402 and a conical pipe 405' that are sequentially connected from top to bottom and connected internally. . Wherein, the oil overflow pipe 41 is arranged in the cylindrical pipe 402, communicates with the cylindrical pipe 402 and extends to its top along the height direction; the water inlet pipe 401 is provided on the side wall of the cylindrical pipe 402; The bottom of 405 is connected, and the water flow after cyclone separation is exported.

[0130] The oil overflow p...

Embodiment 3

[0138] Except that the inlet pressure of the first-stage cyclone separator 4 is 150kPa, the oily sewage with higher density flowing out from the bottom flow pipe 42 of the first-stage cyclone separator 4 enters the second-stage cyclone after being treated by a booster pump. Separator 5, except that the control inlet pressure is 150kPa, all the other are identical with embodiment 1, adopt infrared spectrophotometry method to detect its oil content through the water after filtering, and oil content in water is 4.9mg / L, and oil removal rate is 99.8 %.

[0139] The oil content in the water filtered by fiber balls is less than 5mg / L, which meets the "Recommended Water Quality Standards for Injection of Clastic Reservoirs" (SY / T5329-1994), and can be directly used for oilfield water injection.

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Abstract

The invention relates to a treatment process of oilfield produced water. The treatment process using two-stage oil-water hydrocyclone separation with backflow as a main part is adopted. The treatment process comprises the steps as follows: firstly, adding a demulsifier to perform demulsification pretreatment; next, carrying out two-stage oil-water hydrocyclone separation; and finally carrying out a deep treatment by combination of air floatation and fiber filtration. After the treatment process provided by the invention is carried out, oil in the oilfield produced water can be recycled, and the produced water meets the Recommended Standard of Water Quality of Hidden Water Injection of Clastic Rocks (SY / T5329-1994) and can be used for water injection in oilfields. The treatment process provided by the invention not only reduces the influence of the oilfield produced water on environment, but also recycles resources.

Description

technical field [0001] The invention relates to an oily water treatment process, in particular to a treatment process for oil field produced water. Background technique [0002] With the development of the petrochemical industry, the discharge of oily wastewater is increasing day by day. For example, most of my country's oil fields have entered the middle and late stages of oil exploitation in the process of oil exploitation, and the water content of the extracted crude oil has exceeded 80%, and some oil fields even reach as high as 90%, resulting in a large amount of oily sewage. These oily sewage may cause environmental pollution and even endanger human health. So it is necessary to deal with it. [0003] Oily sewage has the characteristics of high viscosity, complex composition, strong emulsification stability and difficult treatment. Oily sewage not only contains a large amount of oil and suspended particles, but also a large amount of other pollutants such as surfact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 杨敏周宁玉高迎新安伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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