Method for preparing polyacrylamide nano microsphere system

The technology of polyacrylamide and nano-microspheres is applied in the field of preparation of low-cost polyacrylamide nano-microsphere systems, which can solve the problems of limited popularization and application, high price, and high cost of polyacrylamide nano-microspheres, and achieves a wide range of sources, The effect of reducing the dosage and reducing the production cost

Inactive Publication Date: 2010-08-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, polyacrylamide nanospheres are usually synthesized at one time by microemulsion polymerization. In this process, a large amount of expensive emulsifiers and oil-solubl...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] First weigh 86.50g diesel oil, then add emulsifier compounded by 26.10g Span20 and 8.70g Tween80, mix evenly with an electromagnetic stirrer, then mix 48.70g acrylamide (AM), 0.01g methylenebisacrylamide ( MBA), 0.03g of ammonium persulfate (APS), and 29.82g of water were added into the water phase, and after the whole system was mixed uniformly and became transparent or translucent, it was transferred to a 30°C constant temperature water bath with In a four-necked flask with a stirring rod, pass N 2 Deoxygenation was performed for 10 minutes, and finally, 0.20 g of a 20% sodium sulfite (SS) aqueous solution was added to the flask while stirring to initiate free radical polymerization of acrylamide.

[0012] After the exothermic peak of the reaction passed, the reaction was continued for 30 minutes to obtain the first polymerization product.

[0013] Weigh the 70.0 gram aqueous phase (that is, contain 26.571g H 2 O, 43.394g AM, 0.009g MBA and 0.027g APS), it was added...

Embodiment 2

[0017] First weigh 40.00g white oil, then add emulsifier compounded by 4.00g Span20 and 16.00g Tween85, mix evenly with an electromagnetic stirrer, and then mix 20.00g acrylamide (AM), 0.01g polyethylene glycol diacrylic acid Ester (PEGD), 0.01g of potassium persulfate (KPS), and 19.93g of water were added into the water phase, and after the whole system was mixed uniformly and became transparent or translucent, it was transferred to a 30°C constant temperature water bath. In a four-necked flask with a stirring rod, pass N 2 Deoxygenation was carried out for 10 minutes, and finally 0.05 g of a 20% sodium bisulfite (SHS) aqueous solution was added to the flask while stirring to initiate free radical polymerization of acrylamide.

[0018] After the exothermic peak of the reaction passed, the reaction was continued for 30 minutes to obtain the first polymerization product.

[0019] Weigh again the 39.95g aqueous phase (promptly containing 19.93g H) in the same ratio as in the fi...

Embodiment 3

[0024] First weigh 90.00g of peanut oil, then add the emulsifier compounded by 20.00g of Span80 and 20.00g of Tween60, mix evenly with an electromagnetic stirrer, then mix 47.00g of acrylamide (AM), 0.01g of methylenebisacrylamide ( MBA), 0.02g polyethylene glycol diacrylate (PEGD), 0.04g ammonium persulfate (APS), 22.83g water prepared water phase was added to it, after the whole system was mixed evenly and became transparent or translucent, put It was transferred into a four-necked flask with a stirring bar placed in a constant temperature water bath at 30°C in advance, and passed through N 2 Deoxygenation was performed for 10 minutes, and finally 0.10 g of a 20% sodium thiosulfate (STS) aqueous solution was added to the flask while stirring to initiate free radical polymerization of acrylamide.

[0025] After the exothermic peak of the reaction passed, the reaction was continued for 30 minutes to obtain the first polymerization product.

[0026] Weigh again the 62.91g aque...

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Abstract

The invention provides a method for preparing low-cost polyacrylamide nano microspheres by two times of microemulsion polymerization. The prepared polyacrylamide nano microspheres are used for improving an oil recovery factor. The method comprises: firstly, preparing a dispersion of polyacrylamide nano microspheres by microemulsion polymerization; secondly, adding a monomer and aqueous solution of an initiator into the product of the primary polymerization serving as a dispersion medium to form microemulsion by using an emulsifier in the dispersion medium; and finally, initiating polymerization again to obtain high-content polyacrylamide nano microspheres. As no oil soluble solvent and emulsifier are added for the secondary polymerization, the synthesis cost of the polyacrylamide nano microspheres can be reduced considerably. The prepared polyacrylamide nano microsphere system can be directly diluted by water to form polymer microsphere aqueous solution at required concentration and can be used alone or in combination with other oil-field chemicals in fields of profile control, water plugging, fuel scavenge and the like for improving recovery operation.

Description

Technical field: [0001] The invention relates to a preparation method of a low-cost polyacrylamide nano-microsphere system for improving oil recovery. Background technique: [0002] At present, most of the oilfields are in the stage of high water-cut exploitation of water flooding development, the heterogeneity of the reservoir is serious, the water flow advantage channel is well developed, the injected water is ineffective circulation, and the oil layer sweep coefficient is low, resulting in the low oil recovery and the late stage. Reservoir flooding, equipment corrosion, excessive sewage treatment load and other problems. In addition, with the increasing consumption of crude oil and high international oil prices, many offshore oil fields, low-permeability, high-salinity reservoirs and other harsh conditions began to be developed, while most of the existing profile control and water shutoff Agents and related supporting technologies are not suitable for such reservoirs. ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F2/30
Inventor 张贵才王磊葛际江赵楠蒋平孙铭勤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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