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Processing method of tertiary oil recovery produced water containing polyacrylamide

A polyacrylamide and treatment method technology, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of chemical effect, less dosage and strong processing capacity

Inactive Publication Date: 2011-11-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been used for the treatment of tertiary oil recovery water containing polyacrylamide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take the 300ml water sample of the three-way oil flooding produced water in Daqing Oilfield as a treatment sample, wherein the polyacrylamide content in the water sample is 873mg / L, and the suspended solids (referring to the water sample passing through the filter membrane with a pore size of 0.45 μm are retained on the filter membrane and Drying at 103-105°C to constant weight of solid matter (including impurities such as sediment) has a content of 234mg / L and a viscosity of 1.83×10 -4 Pa·S, the initial pH value is 9. After adjusting the pH value of the water sample to 7.5 with hydrochloric acid with a mass concentration of 10%, put the water sample into a 500mL electrolytic cell, insert the electrode plate, the electrode plate is an aluminum plate, and the water entry area of ​​the single electrode plate is 15cm 2 , The distance between the two electrode plates is 2cm. . The chemical flocculant is polyaluminium chloride, and the addition amount is 75mg. Turn on the...

Embodiment 2

[0018] Take a 300ml water sample from polymer flooding produced water from an oilfield as a sample to be treated. The content of polyacrylamide in the water sample is 671mg / L, the content of suspended solids is 197mg / L, and the initial pH value is 8. After adjusting the pH value of the water sample to 7.5 with hydrochloric acid with a mass concentration of 10%, put the water sample into a 500mL electrolytic cell, insert the electrode plate, the electrode plate is an aluminum plate, and the water entry area of ​​the single electrode plate is 15cm 2 , The distance between the two electrode plates is 2cm. The chemical flocculant is made of polysilicate iron, and the addition amount is 90mg. Turn on the power supply of the electroflocculation device, the pulse power frequency is 0.15Hz, the on-off ratio is 0.7, and the current density is 80A / m 2 , stirred for 2 hours under the condition of 80r / min, filtered after settling for 2h, and measured the content of polyacrylamide and sus...

Embodiment 3

[0020] Take 1.5L water sample of simulated polyacrylamide-containing wastewater as the sample to be treated, wherein the content of polyacrylamide in the water sample is 1000mg / L. After adjusting the pH value of the water sample to 7 with a mass concentration of 10% hydrochloric acid, add the water sample to a 2L electrolytic cell, insert the electrode plate, the electrode plate is an aluminum plate, and the water entry area of ​​a single electrode plate is 120cm 2 , the distance between the two electrode plates is 1cm. The chemical flocculant is polyaluminum silicate, and the addition amount is 150mg. Turn on the power supply of the electroflocculation device, the pulse power frequency is 0.3HZ, the on-off ratio is 0.5, and the current density is 120A / m 2 , stirred at 80r / min for 2.5h, settled for 1h and filtered, and measured the content of polyacrylamide and suspended solids in the filtrate. It was determined that the content of polyacrylamide was 81mg / L, and the removal ...

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Abstract

The invention discloses a processing method of tertiary oil recovery produced water containing polyacrylamide, belonging to the processing technology of the oilfield produced water. The method comprises the following steps: using acid or alkali to adjust the pH value of tertiary oil recovery produced water; installing an electrocoagulation device and adding flocculant in the adjusted tertiary oilrecovery produced water, performing electrical-chemical combined flocculation process under the specified ratio of power-on time to power-off time, current density of the plate electrode and stirringcondition to obtain the preprocessed tertiary oil recovery produced water; and using a nano-Al2O3.SiO2-polysulfone composite membrane device to separate the preprocessed tertiary oil recovery produced water and obtain the processed water, wherein the processed water meets oilfield reinjection demands. The invention has the advantages that the electrical-chemical combined flocculation process is adopted, the devices are simple, the operation is simple and the processing ability is strong.

Description

technical field [0001] The invention relates to a treatment method for tertiary oil recovery water containing polyacrylamide, which belongs to the treatment technology of oilfield produced water. Background technique [0002] With the continuous exploitation of oil fields and the continuous development of oil recovery technology, most oil fields in my country have entered the tertiary oil recovery period. Tertiary oil recovery is a technology that adds energy to the formation to drive oil recovery by changing the water injection characteristics of the oilfield by adding polymers to the water, such as adding polyacrylamide for polymer flooding, adding alkali, surfactant and polyacrylamide for three-way oil flooding . The molecular weight of the added polyacrylamide is as high as tens of millions, and after the molecular chain is broken due to shear force and other effects during the oil recovery process, the molecular weight is also more than one million. This is accompanie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 张裕卿安璇单星
Owner TIANJIN UNIV
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