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Oil extraction wastewater polymer preparation processing method

A technology for oil extraction sewage and treatment method, which is applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of harsh operating conditions, high cost, and difficulty in equipment maintenance and use, etc. Achieve the effect of increasing initial viscosity and ensuring stability

Inactive Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN101367586 and CN101948201A adopt reverse osmosis and nanofiltration membrane equipment to reduce sewage mineralization, thereby improving the viscosity of polymer solution prepared by oilfield sewage; CN101357790 utilizes the high temperature of sewage itself, and uses low-temperature evaporation technology to eliminate the impact of impurity ions in sewage on polymer viscosity ;The water quality after these two methods is good, and the viscosity of the prepared polymer is higher than that of clear water, but the operating conditions are harsh, the equipment maintenance is difficult and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The water quality of an oil production sewage is shown in Table 1. First, 15mg / L chlorine dioxide is added to the sewage. After 0.5h, the sewage enters the diatomite filter through the pump. The filtration rate of the filter is 3m / h, and the operating pressure is 0.2 mPa, the filtered sewage is used for ion exchange equipment, the resin is softened cathodic resin 001×7, the operating speed is 18m / h, the sewage after resin treatment is used to prepare polymer, the concentration of polymer solution is 1500mg / L, and the investigation is carried out at 80 ℃ Table 2 shows the initial viscosity of the prepared polymer solution and the stability of the solution viscosity within 30 days before and after oil production wastewater treatment.

[0040] Table 1 Experimental water quality

[0041] Analysis Project

Oilfield sewage

Treated Oilfield Sewage

Turbidity (NTU)

20.6

0.1

suspended matter

36

ND

pH

7.26

7.08

Co...

Embodiment 2

[0045] Take another certain oil production sewage, the water quality is shown in Table 3, first add 10mg / L chlorine dioxide to the sewage, after 1.0h, the sewage enters the diatomite filter through the pump, and the filtration rate of the filter is 2m / h. The operating pressure is 0.32mPa, and the filtered sewage is used for ion exchange equipment. The resin is softened cationic resin (001×7), and the operating speed is 15m / h. L, to investigate the initial viscosity of the prepared polymer solution before and after the treatment of oil production wastewater at 80°C and the stability of the solution viscosity within 25 days. The results are shown in Table 4.

[0046] Table 3 Experimental Water Quality

[0047] Analysis Project

Oilfield sewage

Treated Oilfield Sewage

Turbidity (NTU)

14.5

0.02

pH

7.58

7.43

Conductance (uS / cm)

7321

7601

Ca 2+ (mg / L)

161.0

0.4

Mg 2+ (mg / L)

103.2

ND

...

Embodiment 3

[0051] For the treatment of an oil extraction sewage, the water quality is shown in Table 5. First, 30mg / L chlorine dioxide is added to the sewage, and after 0.5h of action, it enters the diatomite filter. The filtration rate of the filter is 5m / h, and the operating pressure 0.40mPa, the filtered sewage is used for ion exchange equipment, the resin is softened cathodic resin (001×7), the operating speed is 20m / h, and the polymer is prepared from the sewage treated by the resin, and the concentration of the polymer solution is 1500mg / L. The initial viscosity of the prepared polymer solution and the stability of the solution viscosity within 30 days were investigated at 80°C before and after oil production wastewater treatment. The results are shown in Table 6.

[0052] Table 5 Experimental water quality

[0053] Analysis Project

Oilfield sewage

Treated Oilfield Sewage

Turbidity (NTU)

7.2

0.1

pH

8.58

7.18

Conductance (uS / cm)...

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Abstract

The invention relates to an oil extraction wastewater polymer preparation processing method; reducing substances Fe<2+> and S2 causing serious influence on polymer solution viscosity in oil extraction wastewater are oxidized by an oxidant, sulfate reducing bacteria in the oil extraction wastewater is killed, organic matters in the oil extraction wastewater are absorbed by use of strong lipophilicity and super strong adsorption property of a diatomite filter, suspended impurities in the oil extraction wastewater can be removed by filtration, and high valent metal cations casing great influence on preparation polymer solution viscosity can be removed by ion exchange resin equipment. According to the oil extraction wastewater polymer preparation processing method, suspended matters, oil, the organic matters, the sulfate reducing bacteria, the high valent metal cations and the like causing serious influence on polymer solution viscosity in the oil extraction wastewater are removed, the initial viscosity of polymer solution prepared by the wastewater is improved, and the stability of the viscosity of the polymer solution is guaranteed.

Description

technical field [0001] The invention relates to the field of oil field sewage treatment (the field of polymer solution preparation of oil production sewage), in particular to a method for processing oil production sewage by compounding and polymerizing. In particular, it refers to the method of preparing polymer solution after oil extraction wastewater is treated. Background technique [0002] Polymer flooding is an tertiary oil recovery technology widely used in oilfields. Its main mechanism is to increase the viscosity of the water phase by adding polymers to the injected water, thereby expanding the swept volume of the injected water and improving its displacement efficiency. Since the 1980s, oil fields have basically used clear water to prepare polymer solutions to inject into formations. With the continuous expansion of oil production scale, the consumption of fresh water is increasing. After treatment, it is discharged outside, which not only increases the ground oper...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
Inventor 平春霞张英雄曹宗仑邢琳
Owner CHINA PETROLEUM & CHEM CORP
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