Method for treating oil field produced waste water containing polymer

A technology for oil extraction sewage and treatment methods, which is applied in the fields of light water/sewage treatment, oxidized water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., which can solve the problems of the influence of changes in HPAM content and the lack of guarantee of effluent quality.

Inactive Publication Date: 2006-10-25
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer-containing oil recovery sewage treated by the process of the present invention can reach the water injection standard of oil layers with various permeability, and it also solves the problem that the treatment effect of the existing process is greatly affected by the change of HPAM content and the quality of the effluent is not guaranteed.

Method used

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specific Embodiment approach 1

[0004] Specific Embodiment 1: In this embodiment, sewage treatment is carried out according to the following steps: (1) sedimentation and separation of oil extraction wastewater containing polymers; (2) secondary filtration of the sedimentation effluent; (3) oxidation treatment of the filtered effluent (4) Carry out fine filtration treatment to oxidation effluent at last. The secondary filtration is deep bed filtration of fruit shells and filtration of double-layer filter materials. The oxidation treatment process is as follows: filtered water enters the oxidation reactor, the light source ultraviolet lamp is arranged in the reactor along the longitudinal axis, hydrogen peroxide is pumped in from the bottom of the reactor, ozone is generated by the ozone generator, and passes through the bottom of the reactor. The gas distribution device is passed into the reactor. The oxidation reactor is a concentrating photochemical reactor. The fine filtration treatment process is as fol...

specific Embodiment approach 2

[0005] Specific implementation mode two: this embodiment will describe in detail the treatment method of polymer-containing oil recovery wastewater: (1) polymer-containing oil recovery wastewater first enters a combined sedimentation separation tank, and oil-water separation and sedimentation separation of particulate matter are carried out in the tank to remove Slick oil, unstable emulsified oil and easily settled particles in the sewage; (2) The settled effluent enters the shell deep bed filter and double-layer filter material filter for secondary filtration to further remove the oil and particles in the sewage , the above-mentioned sedimentation-secondary filtration treatment process is the current sewage treatment process of some oil production plants in Daqing Oilfield; (3) The filtered water then enters the advanced oxidation reactor, and the oil in the sewage in the reactor will be completely removed, HPAM macromolecules It is oxidized and degraded into small molecules, ...

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Abstract

The invention discloses a polymer-containing oil production sewage treatment method, which relates to a sewage treatment process, in particular to a polymer-containing oil production sewage treatment process. The invention carries out sewage treatment according to the following steps: sedimentation and separation of oil production sewage containing polymer; secondary filtration of sedimentation effluent; oxidation treatment of filtered effluent; and fine filtration treatment of oxidized effluent. The present invention introduces a new high-efficiency treatment process on the basis of partially retaining the current treatment process in the oil field, which not only utilizes the processing capacity of the current process, but also realizes the advanced treatment of sewage, improves the adaptability of the entire process to water quality fluctuations, and ensures The water quality of the treated sewage can reach the water injection standard of oil layers with various permeability. The polymer-containing oil production sewage treated by the process of the invention can reach the water injection standard of oil layers with various permeability, and well solves the problem that the treatment effect of the existing process is greatly affected by the change of HPAM content and the quality of the effluent is not guaranteed.

Description

Technical field: [0001] The invention relates to a sewage treatment process, in particular to a polymer-containing oil extraction sewage treatment process. Background technique: [0002] Polymer flooding technology (adding a certain amount of polymer to the injected water) is the most widely used tertiary oil recovery technology in my country. For example, in 2000, the production of polymer flooding in Daqing Oilfield reached 900×10 4 tons, accounting for 17% of its total production. Polymer-containing oil recovery wastewater is produced along with the development of polymer flooding, and with the promotion of this technology, the amount of wastewater continues to increase. The biggest difference between polymer-containing oil extraction wastewater and conventional oil extraction wastewater is that it contains a large amount of residual polymer-polyacrylamide (HPAM for short). In some oil extraction plants in Daqing Oilfield, the content of HPAM in oil extraction wastewater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/72C02F1/32
Inventor 孙德智任广萌尤宏
Owner HARBIN INST OF TECH
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