Processing method for produced water for ultra-low permeable oil field reinjection

A treatment method and produced water technology, which are applied in biological water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that the suspended solids content and the median particle size of the effluent water quality cannot meet the requirements. , complex operation and high cost, to achieve the effect of prolonging service life, high biochemical reaction efficiency and reducing operating cost

Inactive Publication Date: 2010-03-17
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of complex operation, high cost and the suspended solid content and particle size median value in the effluent water quality of the existing method for treating oilfield produced water cannot meet the "5, 1, 1" standard of ultra-low permeability oilfield reinjection water problem, and provide a treatment method of produced water for reinjection in ultra-low permeability oilfield

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  • Processing method for produced water for ultra-low permeable oil field reinjection
  • Processing method for produced water for ultra-low permeable oil field reinjection

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specific Embodiment approach 1

[0010] Specific embodiment one: the processing of the produced water for reinjection in the ultra-low permeability oil field in this embodiment is realized according to the following steps: 1. Add coagulant or flotation agent to the produced water of the oil field to be treated, and carry out coagulation and sedimentation treatment to obtain Supernatant; 2. The pH value of the supernatant is 6-9, the temperature is 15-40°C, the salinity is 4000-6000mg / L, the suspended solid content is 30-60mg / L, and the suspended solid particle size is 0.1~10μm, oil content 30~150mg / L, COD Cr Under the condition of 300-600mg / L, it is passed into the activated sludge-biofilm reaction tank, and the hydraulic retention time is 6-10h; 3. The oilfield produced water treated in step 2 is passed into the sedimentation tank for sedimentation treatment, and then After passing through a 0.001-0.02 μm ultrafiltration membrane, the treatment of the produced water for reinjection in the ultra-low permeabil...

specific Embodiment approach 2

[0011] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the activated sludge-biofilm in the step two activated sludge-biofilm reaction tank adopts the following methods to domesticate and obtain: a, to the activated sludge-biofilm reaction tank Add filler in the middle, the volume of filler is 18%~28% of the volume of activated sludge-biofilm reaction tank; b, sludge is added into activated sludge-biofilm reaction tank; c, domestication culture; Wherein step b uses The concentration of sludge in the activated sludge-biofilm reaction tank is 3000-5000mg / L. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that the volume of the filler in step 1a is 24% of the volume of the activated sludge-biofilm reaction tank. Other steps and parameters are the same as in the second embodiment.

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Abstract

A processing method for produced water for ultra-low permeable oil field reinjection relates to a waste water processing method which solves the problems of complex operation, high cost, solid content suspended in effluent quality and incapability of medium particle size for achieving the 5, 1, 1 standard of produced water of the ultra-low permeable oil field existing in the existing method for processing oil field produced water. The processing method comprises the following steps: 1. preparing a supernatant; 2. carrying out acclimatization treatment in an activated sludge-biomembrane reaction tank, and then introducing the supernatant; and 3. after precipitation, carrying out hyperfiltration. The processing method adopts an activated sludge-biomembrane compound technology as a reactive agent, can give consideration to long-and-short sludge age, aerobic/anaerobic/anoxic environments, simultaneously removes nutritive materials and hard-degradable organic material in water and has highbiochemical reaction efficiency; the processing method has simple operation and low cost; after the processing method of the invention is adopted, effluence can stably achieve the water quality standard-the 5, 1, 1 standard of produced water of the ultra-low permeable oil field.

Description

technical field [0001] The invention relates to a sewage treatment method. Background technique [0002] With the development of oilfields in the middle and later stages, oilfield produced water (up to 80% to 90%) is a complex multiphase system containing crude oil, suspended solids, bacteria, iron, sulfides, and salts, which has seriously affected the The quality of crude oil, most of the oilfield produced water is directly discharged into the external environment or reinjected into the formation after being treated up to the standard. However, for low-permeability and ultra-low-permeability oil layers, the conventional treatment methods used in oil fields (such as gravity sedimentation, cyclone centrifugal separation, air flotation, and fine filtration, etc.) are difficult to stably meet the recommended water quality indicators for clastic reservoir injection water. and Analysis Methods" (SY / T5329-94) in A 1 water quality requirements. At present, the relatively success...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F3/12C02F3/10C02F3/28
CPCY02W10/10
Inventor 田禹苏欣颖董晶颢
Owner HARBIN INST OF TECH
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