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Advanced treatment method for sewage water from oil production

A technology for advanced treatment of oil extraction sewage, applied in the direction of flotation water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., which can solve the problems of high sewage treatment costs, unstable effluent quality, and frequent cleaning and other problems, to achieve the effect of reducing membrane fouling, less chemical cleaning times, and long running time

Inactive Publication Date: 2009-02-18
HARBIN INST OF TECH +1
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the prior art that the effluent water quality of the multi-stage fine filtration method is unstable and the membrane flux of the simple ultrafiltration method is low, frequent cleaning, and high cost of sewage treatment, and provides a kind of advanced treatment of oil production sewage method

Method used

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specific Embodiment approach 1

[0008] Specific Embodiment 1: The advanced treatment method of oil production sewage in this embodiment is carried out according to the following steps: 1. Pretreatment: firstly, the oil production sewage is subjected to settlement treatment for 9 to 25 hours, and then coagulant is added for coagulation and sedimentation treatment, and then sent into The air flotation tank is treated, and then filtered through the first-level single-layer quartz sand filter and the second-level single-layer quartz sand filter; second, microfiltration treatment: the filtered water treated in step one is pumped into the microfiltration equipment, at 0.01 ~ 1 trillion Under the operating pressure of Pa, carry out dead-end filtration; 3. Advanced treatment of circulating ultrafiltration membrane: send the filtered water treated in step 2 to circulating ultrafiltration membrane equipment for filtration, and the membrane of circulating ultrafiltration equipment runs for 1 to 8 hours , carry out water...

specific Embodiment approach 2

[0009] Specific implementation mode 2: The oil recovery wastewater in this embodiment is the primary oil recovery wastewater, the secondary oil recovery wastewater or the tertiary oil recovery wastewater.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the coagulation and sedimentation treatment time in step 1 is 4 to 15 hours. Others are the same as in the first embodiment.

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Abstract

The invention relates to an oil extraction sewage depth-processing method, and relates to a sewage processing process. The invention resolves the problems of the multi-level precise-filter method in the prior art that the produced water quality is unstable, the flux of the pure hyper-filtration method film is rather low, the cleaning is frequent and the sewage processing cost is high. The method comprises the following steps: pre-treating, micro-filtration treating and cycling hyper-filtration film depth treating. The invention adopts the method integrating the conventional craftwork and the integrated film craftwork to effectively improve the flux of the hyper-filtration film, to prolong the film running period and to reduce the sewage processing cost. The sewage after being processed with the method can reach the A1-level water-injection standard in Recommended Index and Analysis Method for the Water Quality Injected in Clastic Rock Reservoirs (SY / T5329-94).

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, the water content of the produced crude oil is as high as 60-70%, and some oilfields have reached as high as 90%. Among them, the average annual oilfield production water in Daqing Oilfield is as high as 3×10 8 tons, sewage mainly contains: total suspended solids 50-200 mg / L, chemical oxygen demand (potassium dichromate method) 100-500 mg / L, salinity 2500-6000 mg / L, total oil 100-1000 mg / L. When water injection is carried out for oilfields with the same geological conditions, clean water is mainly used as water injection in China, and most of the oil production wastewater is directly discharged into the external environment or reinjected into other formations after being treated up to the standard. However, for low-permeability and ultra-low-permeability oil layers, conventional treatment methods for prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/40C02F9/02C02F1/52C02F1/24
Inventor 于水利徐俊梁红莹左行涛
Owner HARBIN INST OF TECH
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