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Method and device for treating oilfield wastewater

A technology for oil extraction sewage and treatment equipment, which is applied in mining wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of large dosage of chemicals and insignificant reduction in COD, and achieves good results and increased Decontamination effect, effect of increasing water supply pressure

Active Publication Date: 2019-06-18
QINHUANGDAO SANGGE ELECTRICAL CONTROL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of oxidative viscosity reduction degradation is that it is easy to use and does not produce secondary pollution. However, most of the reported patents and literatures regard it as a single oilfield sewage treatment method, so there are often problems such as large dosage of chemicals, adjustment of pH, COD Disadvantages such as insignificant decline

Method used

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  • Method and device for treating oilfield wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A sewage treatment device for oilfield extraction, such as figure 1 As shown, it includes a dealkalizing device 2, an electrochemical treatment device 5, an air flotation machine 6, a dissolved air pump 7, an inclined tube sedimentation tank 15, a first water tank 14, a pressure pump 13, a dual filter material filter 12, and dynamic membrane filtration Device 11 and the second pool 10, the dealkalizing device 2, the electrochemical treatment device 5, the air flotation machine 6, the inclined tube sedimentation tank 15, the first pool 14, the double filter material filter 12, the dynamic membrane filter 11 and The second pool 10 is provided with a feed port and a feed port. The feed port of the dealkalizing device 2 is in communication with the feed port of the electrochemical treatment device 5, and the discharge port of the electrochemical treatment device 5 is connected to the gas The feed port of the floater 6 is in communication, the discharge port of the air floate...

Embodiment 2

[0036] A method for processing oilfield wastewater from oil production is carried out by using the device provided in Example 1. Specific steps are as follows:

[0037] (1) Dealkalizing treatment: input poly-oily wastewater and ternary oily wastewater into the dealkalizing device, and use a DC power supply to establish a DC electric field in the ternary oily wastewater. Metal sodium ions move in the electric field along the current direction and set in the DC electric field. Cationic membrane, the left side of the cation membrane is sewage, and the right side is tap water. Insert a conductive electrode in the sewage on the left to connect to the negative electrode of the power supply, and insert a conductive electrode into the negative electrode of the power supply in the tap water on the right. Enriched. The ionization reaction of the two-sided electrode on the water can transfer more than 90% of the caustic soda in the sewage to the tap water, so that the concentration in the ...

Embodiment 3

[0044] A method for processing oilfield wastewater from oil production is carried out by using the device provided in Example 1. Specific steps are as follows:

[0045] (1) Dealkalizing treatment: input poly-oily wastewater and ternary oily wastewater into the dealkalizing device, and use a DC power supply to establish a DC electric field in the ternary oily wastewater. Metal sodium ions move in the electric field along the current direction and set in the DC electric field. Cationic membrane, the left side of the cation membrane is sewage, and the right side is tap water. Insert a conductive electrode in the sewage on the left to connect to the negative electrode of the power supply, and insert a conductive electrode into the negative electrode of the power supply in the tap water on the right. Metal sodium ions penetrate the ion membrane into the tap water in the direction of the electric field. Enriched. The ionization reaction of the two-sided electrode on the water can tran...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to an oil field produced water treatment method and device. The oil field produced water treatment method sequentially comprises the steps of dealkalization treatment, electrochemical treatment, coagulating sedimentation and filtration. In the electrochemical treatment process, catalysis agentia is added to sewage, and then the sewage is sent to an electrochemical treatment device for treatment, wherein the catalysis agentia is dosed in the way that 45-55 mg of hydrogen peroxide and 350-450 mg of aluminum sulfate are adopted for every one liter of sewage. The oil field produced water treatment device comprises a dealkalization device, an electrochemical treatment device, an air floatation machine, a settling pond, a first pool, a filtering device and a second pool which are sequentially communicated, wherein a dosing hole is formed at the position of a feed inlet of the electrochemical treatment device. By the adoption of the sewage treatment method, PAM, crude oil and water are separated quickly, CODcr in water is reduced to a level below 80 mg / L finally, and the content of PAM is reduced to 5 mg / L. The occupied space of the oil field produced water treatment device is reduced by about 70%, and the device is easier to operate and low in energy consumption.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method and a treatment device of oilfield oil extraction sewage. Background technique [0002] In recent years, most of my country's oil fields have successively entered the tertiary recovery stage. The composite ternary reinjection technology of tertiary oil recovery in oil fields can greatly increase the crude oil recovery rate, which is essential for stable production and lower decline rate of oilfields. However, due to the high alkaline and high viscosity characteristics of ternary oily sewage, the effect of conventional treatment methods is not good (the effect of coagulation and sedimentation is not good, the filter is easily clogged and the biochemical treatment is invalid), and the technical problems of sewage treatment have directly affected The further application of ternary mining technology affects the stability of crude oil production. The existing o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F103/10
CPCC02F1/001C02F1/24C02F1/4672C02F1/4698C02F1/52C02F9/00C02F2103/10
Inventor 王汉勤宋洪华李春祥张凡振苏兴红尤奎宇刘海蛟
Owner QINHUANGDAO SANGGE ELECTRICAL CONTROL EQUIP CO LTD
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