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Ternary combination flooding produced liquid oil-containing sewage treatment technique

A ternary compound and treatment process technology, which is applied in the fields of flotation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Solve problems such as improving the economic and social benefits of the oil field, increasing the formation pressure, and reducing the amount of chemical added.

Active Publication Date: 2008-02-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a process for the treatment of oily sewage in the production fluid of ASP flooding, which solves the problem that the conventional oily sewage treatment process cannot satisfy the treatment of oily sewage in the produced fluid of ASP flooding

Method used

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  • Ternary combination flooding produced liquid oil-containing sewage treatment technique
  • Ternary combination flooding produced liquid oil-containing sewage treatment technique
  • Ternary combination flooding produced liquid oil-containing sewage treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: refer to accompanying drawing. Wastewater produced by ASP flooding 1 (flow 1m 3 / h) First enter the settling tank 2 (tank volume 4m 3 ), the residence time in the sewage tank is 4h. Add degreaser 3 (AM and trimethyl monoallyl ammonium chloride copolymer) to the pipeline, adjust the flow rate of the metering pump to control the dosing concentration of degreaser 3 to 80mg / L. The degreasing agent 3 is mixed with the effluent of the settling tank 2 through the static mixer 4, and then enters the air flotation device 5 to remove oil, and then enters the next stage of treatment. Add flocculant 7 polymerized ferric sulfate and coagulant 8 anionic polyacrylamide (molecular weight 6 million) to the pipeline, adjust the metering pump flow to control the dosing concentration of flocculant 8 and coagulant 9 to 200mg / L and 10mg / L respectively . The flocculant 8, the coagulant 9 and the effluent after air flotation are mixed by the static mixer 9 and then enter the ...

example 1

[0032] Example 1 data table Table 1

[0033] transport

Embodiment 2

[0034]Embodiment 2: refer to accompanying drawing. Wastewater produced by ASP flooding 1 (flow rate 2m 3 / h) First enter the settling tank 2 (tank volume 10m 3 ), the residence time in the tank is 5h. Add the polyether degreasing agent 3 produced by the reaction of epichlorohydrin and polyhydric fatty alcohol into the pipeline, and adjust the flow rate of the metering pump to control the dosing concentration of the degreasing agent 3 to 60mg / L. The degreasing agent is mixed with the effluent of the settling tank 2 through the static mixer 4, and then enters the air flotation device 5 to remove oil, and then enters the next stage of treatment. Add flocculant 7 aluminum sulfate and coagulant 8 anionic polyacrylamide (molecular weight 6 million) to the pipeline, adjust the flow rate of the metering pump to control the dosing concentration of flocculant 7 and coagulant 8 to 400mg / L and 15mg / L respectively. The flocculant 7, the coagulant 8 and the effluent after air flotation a...

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Abstract

The invention discloses a treatment technique for oil sewage in produced liquid in 3-dimension complex drive in oil fields. The produced liquid in 3-dimension complex drive in oil fields contains a mass of polymers, alkali and surfactant, thus water-in-oil emulsion formed in the sewage is quite stable and treatment of the oil and suspended substances is quite difficult. The technique uses methods of natural sedimentation, oil removal by floatation, coagulation sedimentation and mechanical filtration by adding oil removal agent, flocculant and coagulant aid to treat the oil sewage in the produced liquid in 3-dimension complex drive, so as to realize that oil content in the water after the treatment of the sewage is less than 20 mg / L and the content of the suspended substances is less than 20 mg / L to meet the standards of injection water of the 3-dimension complex drive in the oil fields. The technique solves the problems of the oil sewage treatment in the produced liquid in 3-dimension complex drive in the oil fields and has effective economic and social benefits for saving water resource, reducing tertiary recovery cost and protecting the environment.

Description

technical field [0001] The invention relates to the technical field of oilfield oil extraction sewage treatment. In particular, the invention relates to a process for treating oily sewage in oily liquid produced by three-element compound flooding, and belongs to the treatment method for tertiary oil recovery sewage in oilfields. Background technique [0002] At present, the main oil fields (Daqing, Shengli, Dagang, etc.) in the eastern part of my country have entered the late stage of secondary oil recovery. The decline rate of crude oil production is accelerating, and the economic benefits are declining. It is imperative to apply tertiary oil recovery technology to improve recovery. Polymer flooding can increase the recovery rate by 10% (compared to water flooding). This technology has been popularized and applied in Daqing, Shengli, Dagang, Henan and other oil fields, and achieved good economic benefits. ASP flooding is another new technology to enhance oil recovery after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/24C02F1/40
Inventor 马自俊赵振兴王临红黄浪欧阳坚
Owner PETROCHINA CO LTD
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