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Application of degradable water clarifier

A technology of water clearing agent and medicament, applied in the field of degradable water clearing agent, which can solve the problems of reducing the effective utilization rate of equipment and pipelines, increasing power consumption, increasing liquid flow volume, etc.

Active Publication Date: 2021-06-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crude oil emulsion increases the volume of liquid flow, reduces the effective utilization rate of equipment and pipelines, increases power consumption in the transportation process, causes scaling and corrosion of metal pipelines and equipment, and increases fuel consumption in the heating process

Method used

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  • Application of degradable water clarifier
  • Application of degradable water clarifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1, the preparation of degradable water clearing agent

[0046] 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

[0047] Embodiment 2, the preparation of degradable water clearing agent

[0048]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

[0049] Embodiment 3, the preparation of degradable water clearing agent

[0050] 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.

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Abstract

The invention discloses application of a degradable water clarifier. The degradable water clarifier is prepared according to the following steps: in an inert atmosphere, in the presence of an initiator, carrying out polymerization reaction on polymerizable tertiary amine and polymerizable primary amine and / or polymerizable secondary amine to obtain a polymerizable tertiary amine and polymerizable primary amine and / or polymerizable secondary amine oligomer; adding a degradable chain extender, conducting 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 is used for treating oilfield produced liquid, has the capabilities of charge compensation, interfacial film breakdown and reversed-phase aggregation, and can be independently used as an oil-phase water clarifier, a reversed-phase demulsifier, a water clarifier / flocculant, an air flotation agent and an aged oil dehydrating agent or compounded with other agents. The degradable water clarifier can be degraded in hot water and has a good oil removal rate when being used for treating polymer flooding produced water, and the formed polymer-containing floc has self-digestion property.

Description

technical field [0001] The invention relates to the application of a degradable water purifying agent, which belongs to the field of oil field development. Background technique [0002] During the oil field development process, through formation pores, pipelines, pumps, valves and disturbances caused by sudden degassing, water-containing crude oil will form complex and highly stable emulsions such as water-in-oil and oil-in-water, especially in tertiary oil recovery After the technology is applied, the stability of the emulsion will be stronger. Crude oil emulsion increases the volume of liquid flow, reduces the effective utilization rate of equipment and pipelines, increases power consumption in the transportation process, causes scaling and corrosion of metal pipelines and equipment, and increases fuel consumption in the heating process. In order to achieve efficient oil-water separation, oil return to water, and water reinjection, it is necessary to take certain measures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F226/04C08F222/20C08F220/60C08F220/34C08F222/14C02F1/40C02F103/10
CPCC08F220/54C08F220/60C08F220/34C02F1/40C02F2103/10C08F226/04C08F222/1063C08F222/102C08F222/103
Inventor 王秀军张健胡科靖波华朝王姗姗
Owner CHINA NAT OFFSHORE OIL CORP
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