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Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity

A technology for preparing polymers and photochemical oxidation, applied in chemical instruments and methods, light water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of long process, short life, expensive filters, etc.

Inactive Publication Date: 2006-07-19
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the treatment of produced water in low-permeability oilfields, because low-permeability oilfields have stricter water quality requirements, usually only the use of fine filtration and membrane separation technology can meet the requirements, thus making the process longer
Moreover, because the filter is expensive, has a short life, and needs to be cleaned repeatedly, it is difficult to popularize and apply

Method used

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  • Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity
  • Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity
  • Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Effect of Aeration on Viscosity of Polymer Solution Prepared from Sewage

[0033] In the photochemical reactor made of stainless steel, 3 partitions with holes are placed in parallel, and two layers of UV254nm and UV185nm lamps with a height of 350cm are installed, and water is fed by a water pump. When the ratio of aeration gas to water is 0.2~1 / 1, the photochemical reaction time is 5min, the reaction temperature is 45℃, the injection water quality is petroleum 14.1mg / l, pH6.8, volatile phenol 2.6mg / l, sulfide 2.2mg / l , SS 14.6mg / l and Fe2+2.5mg / l, the photochemical reaction treatment was carried out under different aeration rates respectively. After the treatment, 1500mg / l PAM was added to the treated sewage to make a polymer solution, and the viscosity of the injected liquid was detected in 15 minutes. The results are listed in Table 1.

[0034] Table 1. The effect of aeration on the viscosity of polymer solution prepared in sewage

[0035]

...

Embodiment 2

[0038] Effect of Injection Time on Viscosity of Polymer Solution Prepared from Sewage

[0039] In the photochemical reactor made of stainless steel, 3 partitions with holes are placed in parallel, and two layers of UV254nm and UV185nm lamps with a height of 350cm are installed, and water is fed by a water pump. The ratio of aeration gas to water is 0.6 / 1, the photochemical reaction time is 5min, and the reaction temperature is 45°C. The injection water quality is petroleum 14.1mg / l, pH 6.8, volatile phenol 2.6mg / l, sulfide 2.2mg / l, SS 14.6 mg / l and Fe 2+ Under the condition of 2.5mg / l, the aeration photochemical reaction treatment experiment was carried out. After the photochemical reaction treatment, 1500mg / l PAM was added to the sewage to prepare the polymer solution, and the viscosity of the injected liquid was detected at different preparation injection times.

[0040] Table 2. The effect of injection time on the viscosity of polymer solution prepared in ...

Embodiment 3

[0044] Effect of Photochemical Reaction Time on Viscosity of Polymer Solution Prepared from Sewage

[0045] In the photochemical reactor made of stainless steel, 3 partitions with holes are placed in parallel, and two layers of UV254nm and UV185nm lamps with a height of 350cm are installed, and water is fed by a water pump. The aeration gas water ratio is 0.6 / 1, the photochemical reaction time is 3-15min, the reaction temperature is 45°C, the water quality is petroleum 14.1mg / l, pH 6.8, volatile phenol 2.6mg / l, sulfide 2.2mg / l, SS 14.6mg / l and Fe 2+ Under the condition of 2.5mg / l, the aeration photochemical reaction treatment experiment was carried out, and 1500mg / l PAM was added to the treated sewage with different photochemical reaction time to prepare polymer solution, and the change of viscosity of the injection liquid was detected. The results are listed in Table 3.

[0046] Table 3. Effect of photochemical reaction treatment time on viscosity of polymer sol...

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Abstract

The disclosed sewage treatment method increase sewage matched polymer solution viscosity for tertiary oil recovery comprises: connecting the optical chemical reactor, a catalysis reaction filter tank and a pipeline mixer by turns; inputting the sewage into the reactor for aeration on bottom; lifting the outlet water into said filter tank for catalysis oxidation and filter to output water on bottom to enter into said pipeline mixer; adding PAM from dissolved-drug tank in front of the mixer by a metering pump, mixing and preparing polymer reinjection liquid, and using high-pressure pump to inject into strata for oil recovery. This invention eliminates lots of high-active material in sewage, improves injection liquid viscosity, and is simple and cheap with no secondary pollution.

Description

technical field [0001] The invention relates to injection of a polymer solution prepared from oil field tertiary oil recovery sewage, in particular to a sewage treatment and polymer injection method for photochemical oxidation of tertiary oil recovery to improve the viscosity of oil field sewage prepared polymer solution. Background technique [0002] Since the 1980s, the oil field has basically used clear water to prepare polymers to inject into the formation. In this way, on the one hand, groundwater must be exploited, and on the other hand, the remaining sewage in the oilfield must be discharged to meet the standard. With the increasingly stringent environmental protection regulations, the total amount of groundwater exploitation and sewage discharge All will be limited, and the contradiction between the application of existing tertiary oil recovery technology and the treatment of residual sewage will become more prominent, which restricts the development of polymer floodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/02C02F1/32C02F1/72C02F103/10
CPCY02W10/10Y02W10/37
Inventor 肖羽堂
Owner NANKAI UNIV
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