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Deep adjusting water blocking agent of self-crosslinked shell acrylamide multipolymer and its preparation method

A technology of acrylamide copolymerization and deep profile control, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effect of no pressure change and reduced energy consumption

Active Publication Date: 2009-11-11
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1990s, with the improvement of water injection development in major oilfields in eastern my country, the problems of water channeling and edge water and bottom water have become more prominent. Meeting Enhanced Oil Recovery Requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh in turn 30g of acrylamide, 1g of methacryloxyethyltrimethylammonium chloride, 1.55g of N,N'-methylenebisacrylamide, 0.02g of potassium persulfate, add absolute ethanol to 100g, and fully Stir, pass nitrogen gas to exhaust oxygen for 60 minutes, raise the temperature to 60° C. and keep for 3 hours, a white insoluble solid gradually precipitates out of the system.

[0029] Weigh 10g of acrylamide, 20g of sodium acrylate, 5g of deionized water, 0.3g of N,N'-methylenebisacrylamide, and 0.2g of potassium persulfate in sequence, add absolute ethanol to 100g, and fully stir to dissolve. Add it into the white turbid system prepared by the nucleus in 3 times, continue nitrogen and oxygen removal, and keep the temperature at 60°C for 3 hours, and the white insoluble solid will gradually increase.

[0030] Finally, cool, filter, and dry the obtained solid to obtain a white powder. The particle size of the powder is 500nm-100μm, and the size of the nucleus is 400nm-50μm. It c...

Embodiment 2

[0032] Weigh 10g of acrylamide, 30g of methacryloyloxyethyltrimethylammonium chloride, 2.4g of N,N'-methylenebisacrylamide, 2g of azobisisobutyronitrile, add N,N-di Methylformamide to 100g, fully stirred, blown nitrogen to exhaust oxygen for 60 minutes, raised the temperature to 70°C for 3 hours, and white insoluble solid gradually precipitated from the system.

[0033] Weigh 30g of acrylamide, 1g of sodium 2-acrylamido-2-methylpropane sulfonate, 1.2g of N,N'-methylenebisacrylamide, 1.5g of azobisisobutyronitrile, add N, N - Dimethylformamide to 100g, stir well to dissolve. Add it to the white turbid system prepared by the core three times, continue to pass nitrogen and exhaust oxygen, and keep the temperature at 70°C for 3 hours, and the white insoluble solid gradually increases.

[0034]Finally, cool, filter, and dry the obtained solid to obtain a white powder. The particle size of the powder is 500nm-100μm, and the size of the nucleus is 400nm-50μm. It can be quickly dispe...

Embodiment 3

[0036] Sequentially weigh 30g of acrylamide, 20g of methacryloxyethyldimethylbutylammonium bromide, 0.5g of pentaerythritol triacrylate, 0.001g of ammonium persulfate, add acetone to 100g, stir well, and pass in nitrogen to exhaust oxygen After 60 minutes, the temperature was raised to 50° C. for 3 hours, and a white insoluble solid gradually precipitated from the system.

[0037] Weigh 1 g of acrylamide, 20 g of sodium methacrylate, 3.15 g of pentaerythritol triacrylate, and 0.01 g of ammonium persulfate in sequence, add acetone to 100 g, stir well to dissolve. Add it into the white turbid system prepared by the core three times, continue to pass nitrogen and exhaust oxygen, and keep the temperature at 50°C for 3 hours, and the white insoluble solid gradually increases.

[0038] Finally, cool, filter, and dry the obtained solid to obtain a white powder. The particle size of the powder is 500nm-100μm, and the size of the nucleus is 400nm-50μm. It can be quickly dispersed in an...

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Abstract

The invention relates to the field of petroleum exploitation, in particular to a deep profile control and water shutoff agent in high water content period of petroleum exploitation, more specifically a core-shell self-crosslinking acrylamide copolymer deep profile control water shutoff agent and a preparation method thereof. The copolymer core is first synthesized, and then another copolymer shell is synthesized to cover the outer layer of the core. The core part is composed of water-soluble neutral monomer acrylamide, ionic monomer I and cross-linking agent copolymer; the shell part is composed of water-soluble neutral monomer acrylamide, ionic monomer II and cross-linking agent copolymer; ionic monomer Bulk I has opposite charge to ionic monomer II. The core-shell self-crosslinking acrylamide copolymer deep profile control and water shutoff agent is a white solid powder prepared by a dispersion method with a particle size of 500nm to 100μm. It can be quickly dispersed in any oilfield sewage or seawater, and the uniform dispersion time is not long. Over 5 minutes, the viscosity of the solution below 5wt% concentration does not exceed 5mPa.s. The gel can easily reach areas far from injection wells.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a deep profile control and water shutoff agent in high water content period of petroleum exploitation, more specifically a core-shell self-crosslinking acrylamide copolymer deep profile control water shutoff agent and a preparation method thereof. technical background [0002] From the 1960s to the present, deep profile control has been an important means of enhancing oil recovery. With the progress of oil exploitation, the geological structure of the oil reservoir is constantly changing, and this geological change requires the corresponding change of the profile control means used. The existing profile control methods, such as cement slurry, oil-based cement, milk of lime, resin, active heavy oil, water-soluble polymer gel, etc., have played a certain role in enhancing oil recovery in different periods, but in practice it is found that , the application of these technologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42C08F220/56
Inventor 吴飞鹏施盟泉张玉玺王飞
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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