A binary fluoropolymer wetting reversal agent and its preparation method and application

A technology of wetting reversal and polymerization, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling, etc., can solve the problems of wetting reversal capability and cost that need to be improved, and improve oil and gas recovery. rate, improve wettability, and reduce the effect of interfacial free energy

Active Publication Date: 2022-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluorine-containing polymer emulsion provided by CN110982009A has a significantly improved wetting angle compared with the existing wetting reversal agent, but still needs to be improved in terms of wetting reversal ability and cost

Method used

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  • A binary fluoropolymer wetting reversal agent and its preparation method and application
  • A binary fluoropolymer wetting reversal agent and its preparation method and application
  • A binary fluoropolymer wetting reversal agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a 250mL three-necked flask with a reflux device and electromagnetic stirring, add 50mL of distilled water and 0.4g of perfluorooctanoic acid respectively, and then add 4.0g (0.01mol) of dodecafluoroheptyl methacrylate and 4.3g (0.01mol) of 2- (Perfluorohexyl) ethyl methacrylate, ultrasonic emulsification at room temperature for 30min. Then 2.8g (0.02mol) butyl methacrylate (acrylic monomer) and 0.16g initiator azobisisobutyronitrile (AIBN) were dissolved in 50mL of N,N-dimethylformamide (DMF) , drop it into a three-necked flask at a rate of 2-3d / s at 60°C, and then raise the temperature to 80°C for 4 hours to react for 4 hours to obtain a milky white binary fluoropolymer microemulsion, which is a wetting reversal agent . Transmission electron microscope image of binary fluoropolymer microemulsion figure 2 As shown, the emulsion has a small particle size, the minimum can reach 1 μm, and the stability is strong.

[0048] The obtained product has the structure shown ...

Embodiment 2

[0050] The preparation method was as described in Example 1, except that the acrylic monomer was 5.0 g (0.02 mol) of dodecyl methacrylate. The obtained product has the structure shown in formula I, wherein R is dodecyl, n=20, and the weight average molecular weight is about 27000.

Embodiment 3

[0052] The preparation method was as described in Example 1, except that the acrylic monomer was 5.5 g (0.02 mol) of 9-anthracene methyl methacrylate.

[0053] The obtained product has the structure shown in formula I, wherein R is 9-anthracenemethyl, n=20, and the weight average molecular weight is about 28000.

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Abstract

The invention relates to a binary fluorine-containing polymer wet reversal agent, a preparation method and application thereof. Use dodecafluoroheptyl methacrylate and 2-(perfluorohexyl) ethyl methacrylate binary monomer to polymerize with acrylic monomer in the presence of an initiator to obtain a binary fluoropolymer microemulsion wet inversion agent. The binary fluorine-containing polymer emulsion prepared by the present invention is used as a wetting reversal agent, which is stably dispersed in a water-based system. After use, the contact angle between the formation and water can reach 142°, which significantly improves the wettability of the formation and reduces the The interfacial free energy of the reservoir is improved, and the oil and gas recovery is enhanced.

Description

technical field [0001] The invention relates to a binary fluorine-containing polymer wet inversion agent and its preparation method and application, belonging to the technical field of oil and gas exploitation. Background technique [0002] In the various production operations of oil and gas field exploration and development, because the wettability of the reservoir is generally hydrophilic and oil-friendly, the migration resistance of the working fluid and oil and gas resources in the reservoir is relatively large, which increases the energy consumption during the production process. consumption, reducing oil and gas recovery and flowback rate of working fluid. Therefore, the wettability of the reservoir plays a vital role in the production of oil and gas and the reverse flow of working fluid. The addition of a wettability reversal agent can change the reservoir from water-wet to hydrophobic, thereby reducing the resistance in the process of migration and flowback, and ach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/24C08F220/18C09K8/588C09K8/88E21B43/22
CPCC08F220/24C09K8/588C09K8/882E21B43/16C08F220/1804C08F220/1812C08F220/1818
Inventor 王彦玲梁雷刘斌张传保汤龙皓巩锦程许宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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