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Polymer sterilizing flocculant for oil field as well as preparation method and application of polymer sterilizing flocculant

A flocculant and polymer technology, applied in the field of oil field polymer bactericidal flocculants and their preparation, can solve the problems of different compounding concentrations, increasing difficulty, complicated operation, etc. simple effect

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using, it needs to be added twice, the operation is complicated, and different water requires different compound concentrations, which increases the difficulty of on-site operation
The function of each agent in the above technologies is relatively single, and the same agent can only have bactericidal or flocculation effects

Method used

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  • Polymer sterilizing flocculant for oil field as well as preparation method and application of polymer sterilizing flocculant
  • Polymer sterilizing flocculant for oil field as well as preparation method and application of polymer sterilizing flocculant
  • Polymer sterilizing flocculant for oil field as well as preparation method and application of polymer sterilizing flocculant

Examples

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preparation example Construction

[0025] According to the first aspect of the present invention, the present invention provides a kind of preparation method of oil field macromolecule bactericide flocculant, described preparation method comprises the following steps:

[0026] (1) In the presence of co-solvent A and lye, aliphatic secondary amines and chlorinated alkenes undergo the first step of substitution reaction to generate tertiary amines.

[0027] (2) In the presence of an organic solvent, the second-step substitution reaction of the tertiary amine generated in step (1) and sodium chloroalkylbenzenesulfonate occurs to generate a quaternary ammonium salt.

[0028] (3) In the presence of cosolvent B, buffer salt and initiator, the quaternary ammonium salt generated in step (2) is polymerized to obtain the crude product of the bactericidal flocculant.

[0029] (4) Adding a reducing agent dropwise to the bactericidal flocculant mixture obtained by the polymerization reaction in step (3), removing excess ini...

Embodiment 8

[0143] Example 8 Field application of bactericidal flocculant C

[0144] Union Station G 12 The incoming water is produced water from an oil production plant in Shengli Oilfield, and the treatment scale is 4000m 3 / d, the content of sulfate-reducing bacteria in the produced water is 60 / ml, and the content of suspended solids is 80 mg / L. Utilize the bactericidal flocculant C of the present invention to combine station G 12 The produced water was sterilized and flocculated. The dosage of bactericidal flocculant C was 40kg / d. After the treatment, the content of sulfate-reducing bacteria was reduced to 0 / ml, and the bactericidal rate was 100%. The bactericidal effect was good and met the process requirements. After treatment, the content of suspended solids is reduced to 5mg / L, the removal rate of suspended solids is 94%, and the flocculation effect is good, meeting the technological requirements.

Embodiment 9

[0145] Field application of embodiment 9 bactericidal flocculant D

[0146] Union Station C 4 The incoming water is produced water from an oil production plant in Shengli Oilfield, and the treatment scale is 3000m 3 / d, the content of sulfate-reducing bacteria in the produced water is 25 / ml, and the content of suspended matter is 60 mg / L. Utilize the bactericidal flocculant D of the present invention to combine station C 4 The produced water is treated with bactericidal flocculation, and the dosage of bactericidal flocculant D is 30kg / d. After treatment, the content of sulfate-reducing bacteria is reduced to 0 / ml, and the bactericidal rate is 100%. The bactericidal effect is good and meets the process requirements. After treatment, the content of suspended solids was reduced to 8mg / L, the removal rate of suspended solids was 87%, and the flocculation effect was good, meeting the technological requirements.

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to an oil field polymer sterilization flocculant as well as a preparation method and application thereof. The preparation method comprises the following steps: in the presence of a cosolvent A and alkali liquor, carrying out a first-step substitution reaction on aliphatic secondary amine and chlorinated olefin to generate tertiary amine, and carrying out a second-step substitution reaction on the tertiary amine and sodium chloroalkyl benzene sulfonate to generate quaternary ammonium salt; and in the presence of a cosolvent B, a buffer salt and an initiator, carrying out polymerization reaction on the quaternary ammonium salt generated in the step (2) to obtain the bactericidal flocculant. Based on 1 mole part of the fatty secondary amine, the use amount of the chlorinated olefin is 0.7-1.3 mole parts, and the use amount of the sodium chloroalkyl benzene sulfonate is 0.8-1.2 mole parts. The sterilizing and flocculating agent has the characteristics of simple synthesis process, low cost and no secondary pollution, and has a sterilizing and flocculating two-in-one function. The sterilization rate of sulfate reducing bacteria reaches 99% or above, and the removal rate of suspended solids in oil-containing sewage reaches 80% or above.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an oilfield macromolecule bactericidal flocculant and its preparation method and application. Background technique [0002] The oilfield development enters the middle and late stages, and the energy of the formation gradually decreases. The primary oil recovery technology can no longer meet the production needs. The current oil recovery technology is mainly secondary oil recovery and tertiary oil recovery. Both the secondary oil recovery and the tertiary oil recovery need to inject a large amount of water into the formation to replenish the formation. In the absence of energy, since the injected water is recycled, the components in the water become more and more complex, and it is easy to breed various bacteria, mainly including sulfate-reducing bacteria, saprophytic bacteria and iron bacteria. Among them, sulfate-reducing bacteria have the greatest impact on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/50C02F1/56C02F103/10
CPCC02F1/50C02F1/56C02F2103/10C02F2209/10
Inventor 潘永强曹功泽于丹丹冯逸茹王冠黄文斌岳胜辉袁长忠宋清新徐闯
Owner CHINA PETROLEUM & CHEM CORP
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