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Viscosity reduction reaction device for high-concentration polyacrylamide in sewage of oilfield and viscosity reduction method

A technology of polyacrylamide and oilfield sewage, applied in water/sewage treatment, chemical instruments and methods, light water/sewage treatment, etc., can solve the problem of increased viscosity of oil well production fluid, low concentration of polyacrylamide, and low viscosity reduction rate To achieve obvious environmental benefits, reasonable device design, and heat reduction effects

Active Publication Date: 2015-04-08
NORTHEAST GASOLINEEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the addition of polyacrylamide not only improves the recovery rate of oilfield production, but also has a very bad impact on ground engineering.
The increase in the viscosity of the oil well produced fluid increases the difficulty of oil-water separation, increases the cost of separation, and the oil content of the produced water seriously exceeds the standard. At the same time, due to the long-term retention of polyacrylamide in the surface water body and groundwater, it causes serious pollution to the groundwater and affects the environment. had a bad effect
The existing method of reducing the viscosity of oilfield sewage by ultraviolet light mainly adopts the method of synergistic addition of photocatalyst or oxidant. The amide concentration is very low (below 125mg / L), and the viscosity reduction rate can only reach about 60%. For the treatment of oilfield sewage with high concentration polyacrylamide (above 200mg / L), the viscosity reduction rate of this method is very low

Method used

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  • Viscosity reduction reaction device for high-concentration polyacrylamide in sewage of oilfield and viscosity reduction method
  • Viscosity reduction reaction device for high-concentration polyacrylamide in sewage of oilfield and viscosity reduction method
  • Viscosity reduction reaction device for high-concentration polyacrylamide in sewage of oilfield and viscosity reduction method

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Experimental program
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Effect test

Embodiment 1

[0037] Prepare 100 mL of 100 mg / L polyacrylamide aqueous solution and transfer it to a quartz reactor. Turn on the high-pressure mercury light for 30 minutes, take samples every 5 minutes, measure the viscosity of the solution with a rotational viscometer, and draw the change curve of viscosity and viscosity reduction rate with time. μ is the viscosity of polyacrylamide after degradation (its unit is centipoise, cP), μ 0 is the initial viscosity of polyacrylamide. After 10 minutes of reaction, the viscosity of the solution decreased significantly, and the viscosity reduction rate reached 74%; after 30 minutes of reaction, the viscosity reduction rate reached 93.4%, and the solution viscosity was the same as that of distilled water (0.88cP). Viscosity reduction effect such as figure 1 , figure 2 shown.

Embodiment 2

[0039] Prepare 100 mL of 200 mg / L polyacrylamide aqueous solution and transfer it to a quartz reactor. Turn on the high-pressure mercury light for 30 minutes, take samples every 5 minutes, measure the viscosity of the solution with a rotational viscometer, and draw the change curve of viscosity and viscosity reduction rate with time. μ is the viscosity of polyacrylamide after degradation, μ 0 is the initial viscosity of polyacrylamide. After 10 minutes of reaction, the viscosity reduction rate reached 91.6%; after 30 minutes of reaction, the viscosity reduction rate reached 95.9%, and the solution viscosity decreased to the same viscosity as distilled water 0.88cP. Viscosity reduction effect such as image 3 , Figure 4 shown.

Embodiment 3

[0041]Prepare 100 mL of 400 mg / L polyacrylamide aqueous solution and transfer it to a quartz reactor. Turn on the high-pressure mercury light for 30 minutes, take samples every 5 minutes, measure the viscosity of the solution with a rotational viscometer, and draw the change curve of viscosity and viscosity reduction rate with time. μ is the viscosity of polyacrylamide after degradation, μ 0 is the initial viscosity of polyacrylamide. After 10 minutes of reaction, the viscosity reduction rate reached 88.8%; after 30 minutes of reaction, the viscosity reduction rate reached 97.8%, and the solution viscosity dropped to 0.89cP, which was very similar to the viscosity of distilled water (0.88cP). Viscosity reduction effect such as Figure 5 , Image 6 shown.

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Abstract

The invention relates to a viscosity reduction reaction device for high-concentration polyacrylamide in sewage of an oilfield and a viscosity reduction method. The device comprises an oilfield sewage treating device, an ultraviolet lamp, a circulating condensate trap, tinfoil-adhered black box, a power supply, a ballast and a trigger; any viscosity reduction catalyst or oxidant is not fed in oilfield sewage; the ultraviolet lamp is positioned in the circulating condensate trap; when the ultraviolet lamp works, condensed water is continuously poured into the circulating condensate trap to prevent the ultraviolet lamp from releasing excessive heat to cause temperature raise, so as to ensure that the photodegradatlon of high-concentration polyacrylamide is performed under the normal temperature; the power supply supplies power to the ultraviolet lamp; the oilfield sewage treating device and the circulating condensate trap in which the ultraviolet lamp is positioned are arranged in the tinfoil-adhered black box to avoid the influence of other light sources on the reaction. According to the device, the viscosity reduction can be performed under normal temperature and normal pressure, any secondary pollution is not caused, and moreover, the cost is relatively low, the operation is easy, and the novel way is provided for the treatment for the oilfield sewage.

Description

technical field [0001] The invention relates to a viscosity-reducing reaction device and a viscosity-reducing method for high-concentration polyacrylamide in oilfield sewage, belonging to the field of oilfield sewage treatment. Background technique [0002] Polyacrylamide is a general term for homopolymers and various copolymers of acrylamide, and is an organic polymer compound with relatively active chemical properties. Due to the high activity of the amido group on the side chain of the polyacrylamide molecule, it endows polyacrylamide with many excellent properties such as flocculation, thickening, shear resistance, drag reduction, and dispersibility. Polyacrylamide was first widely used in the field of water treatment, including raw water treatment, sewage treatment, industrial water treatment, urban domestic sewage treatment, etc. It is still the most widely used water treatment agent in the field of water treatment at home and abroad. [0003] The application of polya...

Claims

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Application Information

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IPC IPC(8): C02F1/32
CPCC02F1/32C02F2103/10C02F2201/322C02F2201/3228
Inventor 王明吉王洋李金莲林红岩李丽丽闫超王春财
Owner NORTHEAST GASOLINEEUM UNIV
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