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Low-phosphorus multipolymer scale inhibitor, synthesis method, detection method and application

A technology of low-phosphorus terpolymer and multi-polymer copolymer, applied in chemical instruments and methods, measuring devices, descaling and water softening, etc., can solve the problem of loss of dispersion and chelation, intolerance to hard water and high temperature, and large molecular weight To achieve the effect of prolonging the production life, reducing pipeline blockage, and ensuring oilfield production

Pending Publication Date: 2022-01-28
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

However, the biggest problem faced by acrylic polymerization inhibitors is that, first, violent polymerization is easy to occur during polymerization, which causes excessive molecular weight and flocculation, and loses dispersion and chelation.
Second, when there are only carboxyl groups, it is easy to form chelates with heavy metal ions, and it is not resistant to hard water and high temperature

Method used

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  • Low-phosphorus multipolymer scale inhibitor, synthesis method, detection method and application
  • Low-phosphorus multipolymer scale inhibitor, synthesis method, detection method and application
  • Low-phosphorus multipolymer scale inhibitor, synthesis method, detection method and application

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preparation example Construction

[0032] The synthetic method of the low-phosphorous multi-component copolymer scale inhibitor provided by the embodiments of the present invention comprises:

[0033] The ternary monomers IA, MA, and AM were added in a ratio of 2:2:0.5, and 8% of an initiator was added to polymerize at 85° C. for 3 hours to obtain a terpolymer.

[0034] The synthetic method of the low-phosphorous multi-component copolymer scale inhibitor provided by the embodiments of the present invention also includes:

[0035] The quaternary monomers IA, MA, AM, and SAS are added according to the ratio of 2:2:0.5:0.75, the initiator dropping time is 1.0h~1.5h, the amount of initiator is 9.0%, and the polymerization time is 4h, and the reaction temperature is Polymerize at 80°C to synthesize low phosphorus tetrapolymer scale inhibitor.

[0036] Such as figure 1 As shown, the low-phosphorus tetrapolymer copolymer antiscalant detection method provided by the embodiments of the present invention includes:

[...

Embodiment 1

[0044] In the early stage of the research on the ternary polymer, it was obtained that the reaction time was 2h, the amount of the initiator added was 6% (the dropping time was within 2h), the reaction temperature was 80°C, and the pH of the solution was 6-7. Under the reaction conditions, IA :MA:AM=2:1:0.5 The scale inhibition efficiency can reach 79.66% based on the feeding ratio. In later experiments, it was found that this ratio was not the optimal feed ratio and reaction conditions.

[0045] Under the experimental conditions of polymerization temperature 80°C, polymerization time 3h, ternary monomer ratio IA:MA:AM=2:1:0.5, change the mass fraction of the initiator, and measure the change of the scale inhibition efficiency of the polymer ,

[0046] Depend on figure 2 , image 3 , Figure 4 It can be concluded that the best conditions are: the polymerization time is 3h, the reaction temperature is 85℃, and the amount of initiator is 8.0%.

[0047] Consistent with the ...

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Abstract

The invention belongs to the technical field of oilfield development water treatment, and discloses a low-phosphorus multipolymer scale inhibitor, a synthesis method, a detection method and application. The low-phosphorus multipolymer scale inhibitor is prepared by the steps of adding 8% of an initiator into ternary monomers IA, MA and AM according to a ratio of 2: 2: 0.5, and polymerizing at 85 DEG C for 3 hours to obtain a ternary polymer; and polymerizing the quaternary monomers IA, MA, AM and SAS according to a ratio of 2: 2: 0.5: 0.75 in the presence of an initiator at 80 DEG C for 4 hours to synthesize the low-phosphorus quadripolymer scale inhibitor. The detection method of the low-phosphorus quadripolymer scale inhibitor comprises the steps of carrying out characterization analysis on a synthesized low-phosphorus quadripolymer scale inhibitor product by utilizing an infrared spectrum; and meanwhile, conducting purification and suction filtration on the synthesized low-phosphorus quadripolymer scale inhibitor, drying a polymer for one hour through a drying oven, and measuring the scale inhibition rate. The scale inhibitor is low in phosphorus content, resistant to high temperature, high in scale inhibition efficiency and capable of well solving the problem of serious pipeline scaling in oilfield development.

Description

technical field [0001] The invention belongs to the technical field of oilfield development water treatment, and in particular relates to a low-phosphorus multi-component copolymer scale inhibitor, a synthesis method, a detection method and an application. Background technique [0002] At present, the development of most oilfields has entered the high water-cut stage of the third oil recovery, which contains a large amount of salt-forming ions, which breaks the balance of formation water, and a large amount of sewage is used for reinjection treatment, resulting in a large amount of calcium, magnesium, strontium, and barium in the rock formation. Plasma, correspondingly brings problems such as calcium and magnesium scaling and corrosion of pipelines. In severe cases, it will cause failures such as pipeline blockage, pump stuck, and water injection pressure increase, which will lead to a decrease in water injection efficiency, and the scaling problem of pipelines will become m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14G01N21/3577C02F103/10
CPCC02F5/14G01N21/3577C02F2103/10
Inventor 刘佳范兆廷周洋
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY