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Method for treating low-permeability oilfield reinjection water

A technology for oil field re-injection water and treatment method, which is applied in the field of low-permeability oil field re-injection water treatment, can solve problems such as no effective method, and achieve the effects of reducing energy consumption, improving removal efficiency, and reducing sludge load

Inactive Publication Date: 2011-06-29
武汉江扬环境科技股份有限公司
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Problems solved by technology

There is currently no effective method

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  • Method for treating low-permeability oilfield reinjection water
  • Method for treating low-permeability oilfield reinjection water
  • Method for treating low-permeability oilfield reinjection water

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing:

[0020] Such as figure 1 Shown, the present invention comprises the following steps:

[0021] Technical scheme of the present invention comprises the following steps:

[0022] (1) The oil production sewage enters the grease trap, and the floating oil and sediment are removed by inclined plate degreasing, and the hydraulic retention time is 3 hours;

[0023] (2) The water from the grease trap goes to the electrocoagulation air flotation pool. The electrocoagulation air flotation pool contains two parts: electrocoagulation and electrolysis air flotation; the electrocoagulation area uses a certain number of aluminum plate electrodes, which are placed at a certain angle in the lower position of the pool; The anode of the electrolytic air flotation area adopts graphite electrodes, and the cathode adopts stainless steel metal electrodes, which are placed in parallel at the botto...

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Abstract

The invention relates to a method for treating low-permeability oilfield reinjection water, which comprises steps as follows: (1) oil extraction sewage enters an oil separator, floating oil and sediment are removed by inclined-plate oil removal, and the hydraulic power stays for 3 hours; (2) effluent water of the oil separator is condensed in a floatation tank under de-electrifying condition, thereby removing polymers and emulsified oil; (3) the water quantity and water quality of the sewage are conditioned in a conditioning tank to prevent rapid changes of the activated sludge load when the water quality of the sewage greatly fluctuates, and the hydraulic power stays for 10 hours; and (4) a membrane module of a membrane bioreactor is additionally arranged in an aerobic tank, so that all the activated sludge is entrapped in the reactor. The invention has the following advantages: good quality of effluent water, which can meet the water-quality index (A1 standard) for low-permeability oilfield reinjection water; and high resistance to pollution: the sewage is pretreated by oil separation and electrocoagulation floatation before being treated by the MBR (membrane bioreactor), so as to remove most oil and other pollutants which can greatly damage the membrane element, thereby well protecting the membrane element and ensuring that the membrane equipment can stably operate for a long time.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a low-permeability oilfield reinjection water treatment method. Background technique [0002] Oilfield oil production wastewater usually has a high oil content, BOD 5 The / COD is between 0.12 and 0.125, which belongs to refractory biodegradable sewage, which generally contains sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria, etc., which can easily lead to a large number of bacteria. Chemical corrosion and fouling of pipeline equipment can easily be caused by the degree of oxidation. [0003] At present, for low-permeability oilfields, it is still difficult for domestic oilfield wastewater treatment stations to stably make the treated sewage meet the water quality requirements of low-permeability oil layers, especially ultra-low-permeability oil layer reinjection water. Most low-permeability oilfield reinjection water treatment processes are generally...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 朱跃敏高祥肖瑞
Owner 武汉江扬环境科技股份有限公司
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