Degradable water clarifier for polymer flooding produced water and preparation method thereof

A technology for clear water agent and water use, which is applied in the petroleum industry and can solve the problems of intractable sludge

Active Publication Date: 2021-05-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After aging, the precipitate will eventually generate highly elastic polymer-containing sludge ( figure 1 Middle right picture), this type of sludge is extremely difficult to handle

Method used

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  • Degradable water clarifier for polymer flooding produced water and preparation method thereof
  • Degradable water clarifier for polymer flooding produced water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, the preparation of degradable water clearing agent

[0044] First, weigh 57g of N,N-dimethylacrylamide, 3g of diallylamine and 40g of ethanol into the reactor, raise the temperature to 55°C, and add 0.3g of initiator azobisisobutyl Nitrile reaction 8h, obtain N,N-dimethylacrylamide and diallylamine oligomer ethanol solution; Then, add 1.24g polyethylene glycol diacrylate (average molecular weight is 400mol / g, and its molar number is the same as The molar ratio of the secondary amino groups in the oligomer is 0.1:1), the temperature is raised to 70°C, and the chain-extended oligomer is obtained after reaction for 2 h; finally, 15.9 g of anhydrous formic acid (the molar number of which is the same as that of the chain-extended oligomer The molar ratio of the tertiary amine groups in the compound is 0.6:1), and the degradable water purifying agent 1 is obtained after reacting at 70°C for 1 hour.

Embodiment 2

[0045] Embodiment 2, the preparation of degradable water clearing agent

[0046] First, weigh 57g of N-(3-dimethylaminopropyl)methacrylamide, 3g of diallylamine and 40g of ethanol into the reactor, raise the temperature to 55°C, and add 0.3g of nitrogen to trigger Agent tert-butyl hydroperoxide was reacted for 8h to obtain N-(3-dimethylaminopropyl) methacrylamide and diallylamine oligomer ethanol solution; then, add 1.24g polyethylene glycol diacrylate (The average molecular weight is 400 mol / g, and the ratio of the number of moles to the number of moles of the secondary amino groups in the oligomer is 0.1:1), the temperature is raised to 70°C, and the chain-extended oligomer is obtained by reacting for 2 hours; finally, add 9.25 Water formic acid (the molar ratio of the molar number to the tertiary amine group in the chain-extended oligomer is 0.6:1), reacted at 70°C for 1 hour to obtain the degradable water purifying agent 2.

Embodiment 3

[0047]Embodiment 3, the preparation of degradable water clearing agent

[0048] First, weigh 57g of dimethylaminoethyl methacrylate, 3g of diallylamine and 40g of ethanol into the reactor, raise the temperature to 55°C, and add 0.3g of initiator azobisisobutyl Nitrile reaction 8h, obtain N,N-dimethylacrylamide and diallylamine oligomer ethanol solution; Then, add 1.24g polyethylene glycol diacrylate (average molecular weight is 400mol / g, and its molar number is the same as The molar ratio of the secondary amino groups in the oligomer is 0.1:1), the temperature is raised to 70°C, and the chain-extended oligomer is obtained after reaction for 2 hours; finally, 10 g of anhydrous formic acid is added, and its molar number is the same as that of the chain-extended oligomer The molar ratio of the tertiary amine groups is 0.6:1, and the degradable water purifying agent 3 is obtained after reacting at 70°C for 1 hour.

[0049] The performance evaluation results of the water purifiers...

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Abstract

The invention discloses a degradable water clarifier for polymer flooding produced water and a preparation method thereof. The preparation method of the degradable water clarifier comprises the following steps: carrying out polymerization reaction on polymerizable tertiary amine and polymerizable primary amine and/or polymerizable secondary amine in an inert atmosphere in the presence of an initiator to obtain a polymerizable tertiary amine and polymerizable primary amine and/or polymerizable secondary amine oligomer; adding a degradable chain extender, heating, and carrying out a chain extension reaction to obtain a chain extension oligomer; and adding a cationization reagent into the chain extension oligomer, and carrying out a reaction. The degradable water clarifier disclosed by the invention can be degraded in hot water and has a good oil removal rate when being used for treating polymer flooding produced water, and formed polymer-containing flocs have self-digestion performance.

Description

technical field [0001] The invention relates to a degradable water clearing agent for polymer flooding produced water and a preparation method thereof, belonging to the technical field of petroleum industry. Background technique [0002] Oily sludge is a complex by-product produced in the development and production process of oilfields, especially for the polymer-containing oily sludge produced in the process of producing fluids in polymer flooding oilfields. In order to ensure the normal production of oilfields and protect the ecological environment, oily sludge is needed Source reduction technology, try to avoid the generation of sludge and / or the oily sludge can be self-digested in the process of oily sludge generation, releasing crude oil and free water. [0003] At present, oilfield sewage treatment adopts a combination of chemical agents and physical technology (gravity sedimentation, inclined plate oil removal, cyclone air flotation, filtration). The chemical agents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/60C08F220/34C08F222/20C08F222/14C02F1/56C02F103/10
CPCC08F220/54C08F220/60C08F220/34C08F222/103C02F1/56C02F2103/10C08F226/02C08F222/1063C08F222/104C08F222/102
Inventor 张健王秀军胡科靖波华朝
Owner CHINA NAT OFFSHORE OIL CORP
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