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Electrolytic method for treating sewage in oil field

A technology for oilfield sewage and electrolytic treatment, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and achieves the effects of wide adaptability, easy promotion and application, and simple operation

Inactive Publication Date: 2005-01-12
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the application of electrolysis method to the treatment of oilfield sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using electrolytic pre-oxidation method to treat the sewage of an oilfield sewage station, the flow rate is 200m 3 / h, the electrolysis voltage between each pair of cathode and anode is 3.18V, the electrolysis current is 5736A, 12 pairs of electrodes are connected in parallel, and the total electrode area is 3.84m 2 , the distance between each pair of cathode and anode plates is 14 mm, the anode material is aluminum, and the cathode material is platinum. The anode will reduce the reducing substances in the sewage, such as Fe 2+ , S 2- Plasma and FeS colloidal oxidation to colloidal Fe n (OH) m (3n-m)+ And elemental S, the bacteria are completely killed, followed by flocculation, sedimentation, and filtration, so that the sewage can be treated into standard injection water that fully meets the requirements of SY / T5329-94, and the water quality is stable.

[0026] The results of this embodiment are shown in Table 1 below:

[0027] Sulfur

Embodiment 2

[0029] The sewage flow rate of the oilfield sewage station is 360m 3 / h, treated by electrolytic pre-oxidation. The electrolysis voltage between each pair of cathode and anode is 3.37V, the electrolysis current is 9834A, 21 pairs of electrodes are connected in parallel, and the total electrode area is 6.72m 2 , the distance between each pair of cathode and anode plates is 20 mm, the anode material is stainless steel, and the cathode material is aluminum. The anode will reduce the reducing substances in the sewage, such as Fe 2+ , S 2- Plasma and FeS colloidal oxidation to colloidal Fe n (OH) m (3n-m)+ And elemental S, the bacteria are completely killed, followed by flocculation, sedimentation, and filtration, so that the sewage can be treated into standard injection water that fully meets the requirements of SY / T5329-94, and the water quality is stable.

[0030] The results of this embodiment are shown in Table 2:

[0031] Sulfur

Embodiment 3

[0033] The sewage flow rate of the oilfield sewage station is 430m 3 / h, treated by electrolytic pre-oxidation. The electrolysis voltage between each pair of cathode and anode is 6.82V, and the electrolysis current is 6393A; this step consists of 26 pairs of electrodes, a total of 13 pairs of electrodes in the first group are connected in parallel, and a total of 13 pairs of electrodes in the second group are connected in parallel, and then the two groups of electrodes are connected in series connection; the total electrode area is 8.32m 2 , the distance between each pair of cathode and anode plates is 25 mm, the anode material is graphite, and the cathode material is stainless steel. The anode will reduce the reducing substances in the sewage, such as Fe 2+ 、HS - 、H 2 S plasma and FeS colloids are oxidized to colloidal Fe n Oh) m (3n-m)+ And elemental S, the bacteria are almost completely killed, followed by flocculation, sedimentation, and filtration, so that the sewa...

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PUM

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Abstract

The invention provide a method for processing oil field sewage by electrolysing. The method includes following steps: 1. electrolysing, 2. flocculating, 3. subsiding 4. filtering. The electrolysing step related by this invention does not need importing other medicament so does not create extra mud.

Description

technical field [0001] The invention relates to a method for electrolytically treating oil field sewage. Background technique [0002] In the process of oilfield production and development, oily sewage should be produced at the same time, such as oilfield produced water, trench water, well washing water and other oilfield sewage. Oilfield sewage contains impurities such as suspended solids, colloids, dispersed oil, slick oil, and dissolved substances. These sewage must be further treated before further use. Oilfield sewage treatment is to try to remove suspended solids, colloids, dispersed oil and slick oil. [0003] At present, oilfield sewage is mainly treated by a "three-stage" process, that is, oil recovery in large tanks, flocculation and sedimentation, and bed filtration. The oilfield sewage treated according to this process cannot all meet the requirements of various standards (SY / T5329-94) for oilfield injection water. Even if some indicators can meet the standard...

Claims

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Application Information

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IPC IPC(8): C02F1/461
Inventor 游革新刘改山
Owner SOUTH CHINA UNIV OF TECH
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