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Method for pre-oxidizing oil field waste water by using air

A technology for pre-oxidation treatment and oilfield sewage. It is applied in the directions of oxidized water/sewage treatment, mining wastewater treatment, etc. It can solve problems such as power consumption and danger, and achieve the effects of easy regulation, simple operation, and easy promotion and application.

Inactive Publication Date: 2010-05-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to consume a large amount of chemical oxidants in the process of sewage treatment, which is extremely dangerous for oil fields producing oil and gas; electrochemical "pre-oxidation" refers to the purpose of electrolysis of sewage to achieve pre-oxidation, such as the patent CN 1562781A "An Electrolytic Treatment of Oilfield Sewage method", but this method requires power consumption
[0009] At present, in China, relevant researchers have carried out aeration treatment on oilfield sewage, but the purpose is to make the sewage after aeration treatment replace clear water to prepare polymer solution, and the present invention is to make the reducing substances in sewage such as Fe 2+ 、H 2 S, HS - and S 2- Oxidation, and separation from sewage by flocculation and sedimentation, improving the thermodynamic stability of sewage, and finally achieving the purpose of stabilizing water quality. Therefore, there is no report on "pre-oxidation" treatment of oilfield sewage by using air (oxygen)

Method used

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  • Method for pre-oxidizing oil field waste water by using air
  • Method for pre-oxidizing oil field waste water by using air
  • Method for pre-oxidizing oil field waste water by using air

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment adopts the method of the present invention alone, utilizes air to carry out preoxidation to oil field sewage, and sewage flow rate is 238m 3 / h, the air is pressed into the sewage treatment process with an air compressor. Air forms free oxygen or dissolved oxygen in oilfield sewage; using the oxidation ability of free oxygen or dissolved oxygen, ferrous ions in oilfield sewage are oxidized into iron ions, and iron ions are hydrolyzed to form Fe x (OH) m (3x-m)+ Colloidal precipitation, while oxidizing sulfide to elemental sulfur; elemental sulfur is then removed by flocculation, sedimentation and filtration.

[0032] The water quality in the station and the wellhead water quality were monitored, and the results are shown in Table 1.

[0033] The result in the embodiment 1 of table 1

[0034]

[0035]

[0036] As can be seen from Table 1, the method of the present invention can not only treat the sewage into the up-to-standard inje...

Embodiment 2

[0038] In this example, the electrochemical method and the combined method of air and electrochemistry are used to treat oilfield sewage, and the sewage flow rate is 154m 3 / h. The current consumption required by the electrochemical method is 5760A; the method of combining air and electrochemistry is used, that is, the air is first sucked into the sewage treatment system by using the Venturi principle, and then the electrochemical method is used for "pre-oxidation", and the required current is only 295A is required.

[0039] The air and the anode will reduce the reducing substances in the sewage, such as H 2 S, HS - , S 2- , Fe 2+ and FeS etc. oxidized to colloidal Fe x (OH) (3x-m) m+ and elemental S, the bacteria were completely killed, followed by flocculation, sedimentation, and filtration to monitor the water quality in the station and the wellhead water quality, the results are shown in Table 2:

[0040] Table 2 Example 2 Experimental Results

[0041]

...

Embodiment 3

[0044] In this example, the chemical method and the combination of air and chemistry are used to treat oilfield sewage, and the sewage flow rate is 338m 3 / h. The chemical method needs to consume 12.19kg of KClO per hour 3 ;Adopt the method of combining air and chemistry, that is, first use the impact force of the settling tank to overflow to carry the air into the sewage treatment system, and then use chemical methods to carry out "pre-oxidation", the KClO that needs to be consumed 3 Only 0.455kg.

[0045] Air and chemical oxidants will reduce the reducing substances in sewage, such as H 2 S, HS - , S 2- , Fe 2+ and FeS etc. oxidized to colloidal Fe x (OH) (3x-m) m+ and elemental S, the bacteria were completely killed, followed by flocculation, sedimentation, and filtration to monitor the water quality in the station and the wellhead water quality, and the results are shown in Table 3:

[0046] Table 3 Example 3 Experimental Results

[0047]

[0048] It ca...

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Abstract

The invention discloses a method for pre-oxidizing oil field waste water by using the air, which comprises the following steps: introducing the air into oil field waste water to form free oxygen or dissolved oxygen in the oil field waste water; oxidizing the ferroins in the oil field waste water to form ferric ions by using the oxidization action of the free oxygen or dissolved oxygen, hydrolyzing the ferric ions to form Fex(OH)m(3x-m) and colloidal precipitate and oxidizing sulfides to form sulfur; and removing the sulfur by flocculation, sedimentation and filtration. The method has the advantages that: thermodynamic stability of the treated oil field waste water is improved, so that the water quality can keep constant and the suspended material content keeps constant and meets standards at a well mouth in the process of delivering the oil field waste water to a water distributing station and the well mouth; in the pre-oxidization process, no chemical is used, no extra sludge is produced, no pollution is produced and resources and cost are saved, so the pre-oxidization process is a 'green chemical' process; and the pre-oxidization process in which the operation is simple, convenient and safe, is easy to regulate and realize automation, has high adaptability to water volume and is convenient to promote and use.

Description

technical field [0001] The invention relates to a method for pre-oxidizing oilfield sewage by using air, and belongs to the field of oilfield produced water treatment. Background technique [0002] In the process of crude oil extraction in oilfields, the water-containing crude oil extracted from the ground is called "production fluid" or "production fluid", and the water separated from the production fluid is called "oilfield produced water", also known as "oilfield output water". water” or “oilfield sewage”. [0003] After the oilfield enters the stage of water injection development, a large amount of oilfield sewage will be produced. Oilfield sewage is a multi-phase system integrating suspended solids, oil, dissolved gas and dissolved salts. It contains suspended solids, colloidal particles, dispersed oil, slick oil, emulsified oil and other impurities, and forms fine colloids in a sol state with water. particle. For the consideration of environmental protection and res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/74C02F103/10
Inventor 游革新王宏姚文迪王婧
Owner SOUTH CHINA UNIV OF TECH
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