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A method for treating sewage produced by three-element compound flooding in an oil field

A ternary composite, treatment method technology, applied in mining wastewater treatment, flotation water/sewage treatment, neutralization water/sewage treatment, etc. Water purifier dispersed floc separation and other issues

Active Publication Date: 2017-03-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to indoor research and field conditions, it is found that high concentration of polyacrylamide causes high viscosity of sewage, which greatly reduces the efficiency of oil-water separation and mud-water separation in the settling tank, and affects the dispersion, coagulation and separation of flocs of water purifier, and also Causes poor performance of the filter tank
Silicon in sewage can form a series of derivatives such as dimers, polymers, colloidal silicon, silica gel, and silica scale, resulting in increased suspended solids in water and unstable water quality.

Method used

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  • A method for treating sewage produced by three-element compound flooding in an oil field
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  • A method for treating sewage produced by three-element compound flooding in an oil field

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This example provides a treatment method for wastewater produced by ASP flooding in an oil field. The process flow of the treatment method is as follows figure 1 As shown, the sewage is taken from an ASP flooding production sewage treatment test station in Daqing Oilfield, and its composition is: oil 210.2mg / L, suspended matter 126.5mg / L, polyacrylamide 318.5mg / L, surfactant 48.5mg / L, pH value is 9.6, soluble silicon is 85.4mg / L, viscosity is 1.38mPa·s, water temperature is 40°C, the treatment method includes the following steps:

[0050] The above sewage was exposed to oxygen for 3 hours at 40°C;

[0051] Add 400mg / L oxidation viscosity reducer (potassium persulfate) to react for 3 hours, then add pH adjuster (sodium hydroxide) 2000mg / L, silicon remover (magnesium chloride) 60mg / L, flocculate and settle for 2 hours, and the treated sewage contains oil 31.4mg / L, suspended matter 36.5mg / L, soluble silicon 19.1mg / L;

[0052] The settled sewage is filtered through the q...

Embodiment 2

[0055] This example provides a treatment method for sewage produced by ASP flooding in an oil field. The sewage is simulated sewage produced by ASP flooding prepared indoors, and its main components are 231.8mg / L of oil, 156.2mg / L of suspended matter, Polyacrylamide 421.8mg / L, surfactant 54.5mg / L, pH value 9.8, soluble silicon 369.4mg / L (as SiO 2 meter), after shear emulsification, viscosity 1.82mPa s, this processing method comprises the following steps:

[0056] Sewage was exposed to oxygen for 2.5 hours at 40°C;

[0057] Add 420mg / L of oxidation viscosity reducer (potassium persulfate / ferrous sulfate, S 2 o 8 2- and Fe 2+ The mass ratio is 6:1) to react for 3 hours, then add pH regulator (sodium hydroxide) 1000mg / L, silicon remover (magnesium chloride) 40mg / L, flocculate and settle for 2 hours, the treated sewage contains 28.7mg / L of oil and 35.9% of suspended solids mg / L, soluble silicon 46.2mg / L;

[0058] After settling, the sewage is filtered through the quartz san...

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Abstract

The invention provides a treating method of produced sewage in alkaline-surfactant-polymer flooding of an oil field. The treating method comprises the following steps: carrying out sedimentation air floatation oil removal on the produced sewage in alkaline-surfactant-polymer flooding of the oil field, wherein sedimentation air floatation is carried out for 2-4h at the temperature of incoming water; adding a viscosity reducer into the sewage after sedimentation air floatation by virtue of a pipeline static mixer, and reacting for 2-4h; then sequentially adding a pH regulator and a silicon removal agent, and carrying out flocculation sedimentation on a silica body and suspended matters in the produced sewage in alkaline-surfactant-polymer flooding of the oil field; and enabling the sewage after sedimentation to enter a double-filter-material filter to finish treatment on the produced sewage in alkaline-surfactant-polymer flooding of the oil field. The treating method of the produced sewage in alkaline-surfactant-polymer flooding of the oil field is capable of fully degrading polyacrylamide and removing the silica body and the suspended matters, and the sewage after treatment can satisfy the requirement for sewage reinjection of the oil field.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for treating sewage produced by three-element compound flooding in an oil field, and belongs to the technical field of oil field recovery. Background technique [0002] ASP flooding technology can greatly increase oil recovery on the basis of water flooding and polymer flooding, and is an important tertiary oil recovery technology in the later stage of development of high water-cut oilfields. Daqing Oilfield has successively carried out pilot field tests and industrial field tests of strong alkali ASP flooding and weak alkali ASP flooding technologies, and will enter the stage of industrialization promotion. According to the field test situation, the treatment of produced fluid and produced sewage of ASP flooding has become one of the restrictive factors for the promotion of ASP flooding technology. [0003] Since the ASP flooding uses polyacrylamide, anionic surfactant, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/001C02F1/24C02F1/52C02F1/66C02F1/72C02F9/00C02F2101/10C02F2101/38C02F2103/10C02F2301/08
Inventor 刘国良马自俊赵振兴欧阳坚张付生
Owner PETROCHINA CO LTD