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Emulsion type reverse demulsifier for offshore oilfield and preparation method of emulsion type reverse demulsifier

An anti-phase demulsifier and offshore oilfield technology, applied in the field of emulsion-type inverse demulsifier for offshore oilfields and its preparation, can solve problems such as easy to hang on the wall, unable to quickly sweep oil beads, and difficult to compound

Active Publication Date: 2021-06-08
中海油(天津)油田化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it has the characteristics of the widest range of applications, fast degreasing speed, and high degreasing rate, the cationic water purifier can effectively destroy the electric double layer, attract electrostatic attraction, and lead to the aggregation of oil droplets, but the cationic polyquaternium inverse demulsifier The oil-water interface cannot be damaged. It is necessary to increase the molecular weight and enhance the sweeping ability to improve the oil removal efficiency, resulting in tight flocs and easy to hang on the wall
[0003] The non-ionic inverse demulsifiers used for demulsification of O / W emulsions mainly include block polyethers. By reducing the strength of the interfacial film, the coalescence of oil beads is realized. The non-ionic inverse demulsifiers have high oil removal efficiency, The oil-water interface is good, the fluidity of the upper oil droplets is good, and the characteristics of not sticking to the wall, but the polyether type inverse demulsifier has a low molecular weight, and cannot quickly sweep the coalesced oil droplets on the accumulation of oil droplets, resulting in a slow separation of oil and water. The effect of deep water purification is not as good as cationic polyquaternary ammonium salt reverse demulsifier
Cationic polyquaternary ammonium salt reverse phase demulsifier and nonionic polyether reverse phase demulsifier can effectively improve the floc shape when used together, but the two are difficult to compound and easy to separate. It needs to be stirred and mixed before use. The limited processing space in offshore oilfields makes it difficult to apply in offshore oilfields

Method used

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  • Emulsion type reverse demulsifier for offshore oilfield and preparation method of emulsion type reverse demulsifier
  • Emulsion type reverse demulsifier for offshore oilfield and preparation method of emulsion type reverse demulsifier
  • Emulsion type reverse demulsifier for offshore oilfield and preparation method of emulsion type reverse demulsifier

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Embodiment 1

[0029] The preparation of embodiment 1 emulsion type inverse demulsifier

[0030] Pour 50g of distilled water into the four-necked flask first, and after the temperature is controlled to 40°C, start stirring, then slowly drop 35g of the melted diethanolamine resin polyether dry agent into the four-necked flask, and continue stirring for 6 hours after the addition is completed. Then add 25 g of a copolymer of dimethyl diallyl ammonium chloride and acrylamide (effective content 19%), and continue to stir for 2 hours; when the water bath rises to 55° C., start stirring, and dropwise add ethylene glycol into the aqueous phase solution. Add 10 g of alcohol monobutyl ether, and continue stirring for 2 hours after the dropwise addition; then add 8.5 g of ammonium sulfate to the aqueous phase solution, and after it is completely dissolved, continue stirring for 3 hours to obtain emulsion-type inverse demulsifier 1.

Embodiment 2

[0031] The preparation of embodiment 2 emulsion type inverse demulsifier

[0032] First pour 50g of distilled water into the four-necked flask, and after the temperature is controlled to 40°C, start stirring, then slowly drop 40g of the melted diethanolamine resin polyether dry agent into the four-necked flask, and continue to stir for 6 hours after the dropping is completed. Then add 20 g of a copolymer of dimethyl diallyl ammonium chloride and acrylamide (effective content 19%), and continue to stir for 2 hours; when the water bath rises to 55° C., start stirring, and dropwise add ethylene glycol into the aqueous phase solution. Add 10 g of alcohol monobutyl ether, and continue to stir for 2 hours after the dropwise addition; then add 8.5 g of ammonium sulfate to the aqueous phase solution, and after it is completely dissolved, continue to stir for 3 hours to obtain emulsion-type inverse demulsifier 2.

Embodiment 3

[0033] The preparation of embodiment 3 emulsion type inverse demulsifier

[0034] First pour 50g of distilled water into the four-necked flask, and after it is controlled to 40°C, start stirring, then slowly drop 45g of the melted diethanolamine resin polyether dry agent into the four-necked flask, and continue to stir for 6 hours after the addition is completed. Then add 15 g of a copolymer of dimethyl diallyl ammonium chloride and acrylamide (effective content 19%), and continue to stir for 2 hours; when the water bath rises to 55° C., start stirring, and dropwise add ethylene glycol into the aqueous phase solution. Add 10 g of alcohol monobutyl ether, and continue to stir for 2 hours after the dropwise addition; then add 8.5 g of ammonium sulfate to the aqueous phase solution, and after it is completely dissolved, continue to stir for 3 hours to obtain emulsion-type inverse demulsifier 3.

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Abstract

The invention discloses an emulsion type reverse demulsifier for an offshore oilfield and a preparation method of the emulsion type reverse demulsifier. The method comprises the following two steps: step 1, compounding and dissolving cationic polyacrylamide and alcohol amine resin polyether; and step 2, preparing the emulsion type reverse demulsifier. According to the invention, cationic polyacrylamide and diethanol amine resin polyether are taken as raw materials for compounding, and a solubilizer and a stabilizer are added, so that the emulsion type reverse demulsifier for the offshore oilfield is prepared. The reverse demulsifier disclosed by the invention has a good treatment effect when being used for treating oily sewage generated by a high-water-content oil field.

Description

technical field [0001] The invention belongs to the technical field of petroleum industry, and in particular relates to an emulsion-type reverse-phase demulsifier for offshore oil fields and a preparation method thereof. Background technique [0002] At present, the inverse demulsifiers developed for O / W emulsions at home and abroad mainly include low molecular electrolytes, alcohols, surfactants, and high molecular polymers. Among them, high molecular polymer reverse phase demulsifiers are widely used, and can be divided into cationic, anionic and nonionic reverse phase demulsifiers according to their chargeability. The cationic high molecular polymer anti-phase demulsifier is mainly cationic polyquaternary ammonium salt type, and the polymerizable quaternary ammonium salt monomer is used as the main raw material to undergo free radical polymerization to obtain a polyquaternary ammonium salt anti-phase demulsifier. The common polymerizable quaternary ammonium salt monomers...

Claims

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Application Information

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IPC IPC(8): B01D17/05
CPCB01D17/047
Inventor 王永军魏强郭海军王勇张国欣代红成张勇李羽
Owner 中海油(天津)油田化工有限公司
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