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Method for treating oil-field secondary produced water

A treatment method and technology for produced water, which are applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problems of HPAM content changes and unguaranteed water quality.

Inactive Publication Date: 2015-04-29
KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • 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 implementation mode 1: In this implementation mode, sewage treatment is carried out according to the following steps: (1) Sedimentation and separation of the secondary production water of the oil field; (2) Secondary filtration of the sedimentation effluent; (3) Oxidation treatment of the filtered effluent; (4) Finally, finely filter the oxidized effluent. 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 2: This implementation mode will describe in detail the treatment method of polymer-containing oil extraction wastewater: (1) The polymer-containing oil extraction wastewater first enters the combined sedimentation separation tank, and the 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 primary and secondary filtration treatment process is the current sewage treatment process of some oil production plants in Daqing Oilfield; (3) The filtered water will then enter the advanced oxidation reactor, and the oil in the sewage in the reactor will be completely removed, HPAM macromolecules It is oxi...

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Abstract

The invention discloses a method for treating oil-field secondary produced water, and relates to a sewage treating technology, particularly to a technology for treating the oil-field secondary produced water. The method comprises sewage treatment steps as follows: settling separation is performed on the oil-field secondary produced water; secondary filtration is performed on settled water; oxidization treatment is performed on filtered water; finally, fine filtration treatment is performed on oxidized water. Under the condition that existing oil-field treatment procedures are partially reserved, a new efficient treatment procedure is introduced, the treatment capability of an existing technology is utilized, deep treatment of sewage is realized, the adaptability of the whole technology to water quality fluctuations is improved, and the quality of the treated sewage can reach water injection standards of oil reservoirs with various permeability. The polymer-containing secondary oil recovery sewage treated with the technology can reach the water injection standards of the oil reservoirs with the various permeability, and problems that the treatment effect of the existing technology is greatly affected by the HPAM content change and the produced water quality cannot be guaranteed are well solved.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a treatment process for oilfield secondary production water. Background technique [0002] Polymer flooding technology (adding a certain amount of polymer to the injected water) is the most widely used secondary and tertiary oil recovery technology in China. For example, in 2000, the polymer flooding production in Daqing Oilfield reached 900×104 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 wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 曹惠忠李卓坪
Owner KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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