Treatment method and treatment apparatus for oil filed produced water

A treatment method and technology of produced water, which is applied in the fields of mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of backward produced water treatment technology, achieve good water production effect and reduce operating costs Low, stable operation effect

Active Publication Date: 2017-03-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the existing oilfield produced water treatment technology is obviously backward and cannot keep up with the rapid development of the petroleum industry, which has become one of the key factors to curb the further development of the petroleum industry.

Method used

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  • Treatment method and treatment apparatus for oil filed produced water
  • Treatment method and treatment apparatus for oil filed produced water
  • Treatment method and treatment apparatus for oil filed produced water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Retrieve the activated sludge from the sedimentation tank of Station No. 72 of the No. 2 Oil Production Plant of Xinjiang Oilfield, and carry out film acclimation. After the system runs stably, a continuous experiment is carried out with produced water, with a treatment capacity of 1m 3 / hr. Air oxidation hydraulic retention time 2hr, coagulation tank PAC dosage 700mg / L, PAM dosage 1.5mg / L, multiphase air flotation hydraulic retention time 45min, vertical flow sedimentation tank PAC dosage 60mg / L, hydraulic retention The time is 1.5hr, the electrocatalytic oxidation current is 450A, and the hydraulic retention time is 50min. The experimental results are shown in Table 2, and the removal rate of the system is shown in Table 3.

[0047] Table 2 system process effluent water quality

[0048]

[0049]

[0050] It can be seen from the experimental results in Table 2 that all the oil was removed, the removal rate of suspended solids reached 99.3%, and the CO...

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Abstract

The present invention provides a treatment method and a treatment apparatus for oil filed produced water. The treatment method specifically comprises that produced water is treated by using an air oxidation / coagulation air flotation / biological fluidized bed / vertical flow precipitation / electrocatalytic oxidation combination technology, and belongs to the field of environmental protection. The treatment apparatus comprises an air oxidation groove, a coagulation groove, a multi-phase inclination plate air floatation machine, a biological fluidized bed reactor, a vertical flow type precipitation pool, and an electrocatalytic oxidation reactor. According to the present invention, after the produced water is treated, the oil content is reduced to 0 from 96 and the removal rate is 100%, the suspended solid is reduced to 2 mg / L from 306 mg / L and the removal rate is 99.3%, the CODcr is reduced to 10 mg / L from 832 mg / L and the removal rate is 90.4%, the BOD5 is reduced to 15 mg / L from 236 mg / L and the removal rate is 93.6%, and various indicators achieve the grade 1 standard of Integrated wastewater discharge standard GB 8978-1996.

Description

technical field [0001] The invention belongs to the field of oilfield produced water treatment, and in particular relates to a method and device for treating produced water with air oxidation / coagulation air flotation / biological fluidized bed / vertical sedimentation / electrocatalytic oxidation combined technology. Background technique [0002] At present, most of my country's oil fields have entered the middle and late stages of oil development, and have entered the stage of tertiary oil recovery. The water content in the produced fluid is 70-80%, and some oil fields have even reached 90%, and the produced water is very large. Polymer flooding and ASP flooding are the most important tertiary oil recovery technologies, and have been widely promoted in many oil fields. [0003] The composition of oilfield produced water is complex. It not only contains crude oil, but also dissolves various salts and gases in the formation in the high-temperature and high-pressure oil layer, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
Inventor 孙承林于永辉王维杨旭卫皇曌李敬美荣欣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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