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Temperature-resistant and salt-resistant multi-component copolymerized pre-crosslinked gel particles and its preparation method and application

A multi-component copolymerization, temperature-resistant and salt-resistant technology, which is applied in the fields of petroleum exploration, transportation and chemical industry, can solve the problem of unstable structure of pre-crosslinked gel particle crosslinking agent, low polymer chain content and molecular weight, and difficulty in meeting the spread of oil reservoirs. Volume and other issues, to achieve the effect of effectively controlling the reaction rate, high molecular weight, and conducive to chain growth

Active Publication Date: 2021-03-09
山东聚星石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pre-crosslinked body has the characteristics of deformation and selective entry in the formation, due to the influence of temperature and salinity, the viscosity is not high, the improvement of the sweep coefficient is limited, and it is difficult to meet the requirements of different reservoirs to fully expand the swept volume
[0004] Patent application CN105368422A discloses a pre-crosslinked bulky granule profile control agent and its preparation method. The synthetic raw material of the pre-crosslinked bulky granule profile control agent is 2-acrylamido octadecyl sulfonic acid or 2-propylene Amide hexadecyl sulfonic acid has a large ion steric hindrance effect, and the synthesized pre-crosslinked bulky particle profile control agent is a body-shaped polymer with a high degree of crosslinking, and the content and molecular weight of free polymer chains inside are very low. , the thickening effect is poor
Patent CN102585093B discloses pre-crosslinked gel particles for profile control and polymer flooding and its preparation method and application. Easy to degrade and fail at reservoir temperature
Therefore, a pre-crosslinked gel particle with better temperature and salt resistance, easy injection, migration in the formation, and dynamic profile control effect has not yet been proposed.

Method used

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  • Temperature-resistant and salt-resistant multi-component copolymerized pre-crosslinked gel particles and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 100Kg deionized water into the reaction kettle, then add 15Kg AM and 1Kg AMPS in sequence, and then add the next substance after the previous substance is completely dissolved, while keeping the temperature of the reaction system at 25°C, stir for 1 hour, and finally fully stir and mix. uniform. Add 2.32Kg of N,N-dimethylacrylamide to the above reaction system, and after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the oxygen in the reaction system. Adjust the pH in the reaction kettle, and slowly add 0.1015Kg potassium persulfate and 0.0145Kg 1-acetate-3-allylimidazolium tetrafluoroborate composite initiation system aqueous solution prepolymerization into the reaction system under the protection of nitrogen.

[0055] The reaction kettle was sealed, and 2.32Kg of nanoclay was added during the process. The reaction time was 3 ho...

Embodiment 2

[0058] Add 100Kg deionized water into the reaction kettle, then add 15Kg AM and 5Kg AMPS in sequence, and then add the next substance after the previous substance is completely dissolved, while keeping the temperature of the reaction system at 30°C, stir for 1 hour, and finally fully stir and mix. uniform. Add 3.12Kg of N,N-dimethylacrylamide to the above reaction system, and after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the oxygen in the reaction system. Adjust the pH in the reaction kettle, slowly add 0.54Kg potassium persulfate and 0.06Kg 1-acetate ethyl-3-allylimidazole bis(trifluoromethanesulfonyl)imide salt to the reaction system under the protection of nitrogen Initiate the prepolymerization of the aqueous solution of the system.

[0059] The reaction kettle was sealed, and 2.6Kg of nanoclay was added during the process. The ...

Embodiment 3

[0062] Add 100Kg deionized water into the reaction kettle, then add 50Kg AM and 1Kg AMPS in turn, and then add the next substance after the previous substance is completely dissolved, while keeping the temperature of the reaction system at 27°C, stir for 1 hour, and finally fully stir and mix. uniform. Add 1.609Kg N,N-dimethylacrylamide to the above reaction system, and after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the oxygen in the reaction system. Adjust the pH in the reactor, and slowly add 0.4027Kg of potassium persulfate and 0.0503Kg of 1-acetate-3-allylimidazole hexafluorophosphate to the reaction system under the protection of nitrogen to initiate the pre-polymerization of the aqueous solution of the system.

[0063] The reaction kettle was sealed, and 3.322Kg of nanoclay was added during the process. The reaction time was 3.5...

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Abstract

The invention proposes a temperature-resistant and salt-resistant multi-component copolymerized pre-crosslinked gel particle and its preparation method and application, which belong to the technical fields of petroleum exploitation, transportation and chemical industry. The pre-crosslinked gel particles provided by the present invention are formed by the copolymerization of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid. The copolymer has a stable structure, good high-temperature aging resistance, is not easy to hydrolyze, and has good contact with polymers. The compatibility of the system greatly increases the viscosity of the system, improves the suspension performance of the pre-crosslinked gel particles in the system, and makes the oil displacement capacity of the system stronger and the oil displacement efficiency higher.

Description

technical field [0001] The invention belongs to the technical fields of petroleum exploitation, transportation and chemical industry, and relates to a temperature-resistant and salt-resistant multi-component copolymerized pre-crosslinked gel particle and a preparation method and application thereof. Background technique [0002] Polymer flooding is one of the earliest developed tertiary oil recovery technologies, and now it is the most mature technology of chemical flooding tertiary oil recovery, and has been widely used in oilfields at home and abroad. After polymer flooding, the ultimate recovery rate of the oil reservoir can reach 40%~50%, and more than 50% of the remaining oil still needs to be developed urgently, and the reservoir recovery potential is still very large. [0003] The pre-crosslinked body is a new type of polymer material, which does not dissolve in water, but swells into micron particles with certain viscoelastic properties. In recent years, it has been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/54C09K8/588
CPCC08F220/56C09K8/588C08F220/585C08F220/54
Inventor 齐书磊李慎伟杨姗陈海燕
Owner 山东聚星石油科技有限公司
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