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Polyacrylamide microgel as well as preparation method and application thereof

A technology of polyacrylamide and acrylamide, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the particle size of polyacrylamide oil displacement agent is small, it cannot block the large pores of the reservoir, and it is not suitable for the reservoir and other problems, to achieve good oil displacement effect, large particle size, and reduce industrial costs

Active Publication Date: 2011-07-20
北京石大万嘉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above methods all require multiple steps to obtain the product, the process is complicated, the energy consumption is high, and the particle size of the obtained polyacrylamide oil displacement agent is small, which cannot block the large pores in the oil reservoir, so it is not suitable for long-term water displacement. flooded reservoir

Method used

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  • Polyacrylamide microgel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 30 parts by weight of Span80 and 300 parts by weight of white oil are mixed at 45°C to 50°C to obtain mixed liquid 1, and it is cooled to room temperature.

[0026] At room temperature, 15 parts by weight of sodium acrylate, 5 parts by weight of sodium 2-acrylamido-2-methylpropanesulfonate, 55 parts by weight of acrylamide, 1 part by weight of N,N'-methylenebisacrylamide and 1 part by weight 1 part of potassium persulfate is mixed with 150 parts by weight of distilled water to obtain mixed solution 2.

[0027] At room temperature, the mixture 2 was added dropwise to the mixture 1 at a stirring speed of 120 revolutions / min, and then the temperature was raised to 70° C., stirred for 1 hour, and the heating was stopped. Continue stirring at the stirring speed for 1 hour to obtain polyacrylamide micro The gel, observed under the electron microscope, the polyacrylamide microgel is spherical, and the particle size is 30-110 microns.

Embodiment 2

[0029] 0.3 parts by weight of Span80 and 40 parts by weight of white oil are mixed at 45°C to 50°C to obtain mixed solution 1, and it is cooled to room temperature.

[0030] At room temperature, 2 parts by weight of sodium acrylate, 2 parts by weight of sodium 2-acrylamido-2-methylpropanesulfonate, 6 parts by weight of acrylamide, 0.025 parts by weight of N,N'-methylenebisacrylamide and 0.1 parts by weight One part of ammonium persulfate is mixed with 20 parts by weight of distilled water to obtain mixed liquid 2.

[0031] At room temperature, the mixture 2 was added dropwise to the mixture 1 at a stirring speed of 70 revolutions / min, and then the temperature was raised to 70° C., stirred for 1 hour, then the heating was stopped, and stirring was continued at the stirring speed for 1 hour to obtain polyacrylamide micro The gel, observed under the electron microscope, the polyacrylamide microgel is spherical, and the particle size is 30-150 microns.

Embodiment 3

[0033] Mix 6 parts by weight of Span80 and 120 parts by weight of white oil at 80°C to 100°C to obtain mixture 1, and cool it to room temperature.

[0034] At room temperature, 15 parts by weight of sodium acrylate, 2 parts by weight of N-vinylpyrrolidone, 6 parts by weight of acrylamide, 0.05 parts by weight of N,N'-methylenebisacrylamide, 1 part by weight of potassium persulfate and 40 parts by weight of distilled water Mix, get mixture 2.

[0035] At room temperature, the mixture 2 was added dropwise to the mixture 1 at a stirring speed of 80 revolutions / min, and then the temperature was raised to 80 °C, stirred for 1 hour, stopped heating, and continued to stir at the stirring speed for 1 hour to obtain polyacrylamide micro The gel, observed under the electron microscope, the polyacrylamide microgel is spherical, and the particle size is 30-150 microns.

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Abstract

The invention discloses a polyacrylamide microgel as well as a preparation method and application thereof. The particle size of the polyacrylamide microgel is 30-150 micrometers, acrylamide, sodium acrylate, N,N'-bisacrylamide, 2-acrylamide-2-methylpropanesulfonic acid sodium, styrenesulfonate and the like serve as polymerized monomers, white oil and the like serve as disperse phases, and the polymerized monomers and the disperse phases are subjected to thermal initiation suspension polymerization to obtain the polyacrylamide microgel. The polyacrylamide microgel synthetized by the method can be directly injected into an oil layer without being processed and has a good plugging effect.

Description

Technical field [0001] The invention relates to a polyacrylamide microgel, a preparation method thereof, and application as an oilfield control and flooding material. Background technique [0002] Generally, the use of oil layer energy to extract oil is called primary oil recovery; the injection of water and gas into the oil layer to supplement energy to extract oil is called secondary oil recovery; and the use of chemical substances to improve the performance of oil, gas, water and rocks. , To extract more oil, called tertiary oil recovery. Tertiary oil recovery mainly includes: surfactant injection, polymer thickening water injection, alkali injection water flooding, carbon dioxide injection flooding, alkali injection plus polymer flooding, inert gas injection, etc. Polymer flooding is a major category of chemical flooding. In tertiary oil recovery technology, the use of polymer flooding can greatly improve oil recovery. At present, the most widely used polymer oil-displacing...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F222/38C08F226/10C08J3/075C09K8/588
Inventor 梁玉彪崔国友吴新敏
Owner 北京石大万嘉新材料科技有限公司
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