Process of treating oil-bearing sewage for ternary combination flooding in oil field

A ternary composite, treatment process technology, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, neutralized water/sewage treatment, etc. Difficult to remove, etc.

Active Publication Date: 2007-11-07
大庆德美特尔能源科技有限公司
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Problems solved by technology

[0002] With the implementation of ASP flooding, the stability of oil-water emulsion in oily sewage has been significantly enhanced, and the treatment capacity of oily sewage treatment facilities built in the oil field has been significantly reduced, and the water quality of some oily sewage treatment stations has seriously exceeded the standard.
[0003] The components of ternary sewage are very complex, mainly including crude oil, suspended solids (sediment, organic matter, colloid, asphaltene and paraffin and other heavy oils and colloids) that have not been separated in production, and a large amount of polymers, alkali, Chemical agents such as surfactants, these chemicals interact with oil and suspended solids in water, which increases the difficulty of oil-water separation and solid-liquid separation
[0004] The polymer in the sewage i

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  • Process of treating oil-bearing sewage for ternary combination flooding in oil field

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the implementation method.

[0026] Take the oil containing less than 3000mgL -1 , The polymer content is 140-650mg / L, the surfactant content is 14-350mg / L, and the alkali content is 228-1500mg / L.

[0027] According to the oily sewage treatment process of oilfield three-element compound flooding of the present invention, firstly, the sewage is pretreated in the settling tank, and the sewage is stagnated in the settling tank for 7-8 hours, and most of the suspended matter in the sewage is removed by the principle of gravity settlement. oil; then, the sewage treated by gravity sedimentation is sent to the oil-water separator, and in the oil-water separator, the sewage is treated by a composite process combining cyclone and air flotation to remove the emulsified oil in the sewage and in the pretreatment When the slick oil is not removed, the oil content in the sewage is not more than 30mgL -1 , the...

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Abstract

The present invention discloses process of treating oil-bearing sewage for ternary combination flooding in oil field. The process includes the following steps: 1. gravitational settling of the sewage; 2. combined cyclonic and air floating treatment for oil-water separation; 3. regulating pH value of sewage and adding inorganic flocculant and organic flocculant; 4. further settling; and 5. filtering in a double filter material filter and a modified fiber ball filter. The process can treat sewage to reach the requirement for using as recirculated polymer flooding water with oil content not more than 30 mg/1, suspended matter content not more than 30 mg/1 and granularity midvalue not greater than 5 micron.

Description

technical field [0001] The invention relates to a process for treating oily sewage by three-element compound flooding in an oil field. Background technique [0002] With the implementation of ASP flooding, the stability of the oil-water emulsion in oily sewage was significantly enhanced, and the treatment capacity of the oily sewage treatment facilities built in the oil field was significantly reduced, and the water quality of some oily sewage treatment stations seriously exceeded the standard. [0003] The components of ternary sewage are very complex, mainly including crude oil, suspended solids (sediment, organic matter, colloid, asphaltene and paraffin and other heavy oils and colloids) that have not been separated in production, and a large amount of polymers, alkali, Chemical agents such as surfactants, these chemicals interact with oil and suspended solids in water, which increases the difficulty of oil-water separation and solid-liquid separation. [0004] The polym...

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Application Information

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IPC IPC(8): C02F9/04C02F1/24C02F1/66C02F1/52
Inventor 高雁鸣阎敏侯华业
Owner 大庆德美特尔能源科技有限公司
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