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Thickener for supercritical carbon dioxide oil displacement as well as preparation method and application thereof

A carbon dioxide and thickening agent technology, which is applied in the field of thickeners and thickeners for supercritical carbon dioxide, can solve the problems of high concentration, high cloud point pressure of thickeners, affecting the oil displacement effect of supercritical carbon dioxide, etc. The effect of low cloud point pressure, excellent viscosity-increasing performance, and abundant raw material sources

Active Publication Date: 2021-02-09
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cloud point pressure of the thickener is too high (higher than the formation pressure) or the concentration is too high, which seriously affects the effect of supercritical carbon dioxide flooding

Method used

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  • Thickener for supercritical carbon dioxide oil displacement as well as preparation method and application thereof
  • Thickener for supercritical carbon dioxide oil displacement as well as preparation method and application thereof
  • Thickener for supercritical carbon dioxide oil displacement as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a thickener, which is obtained by polymerizing the following polymerizable monomers under the action of an initiator:

[0047] Polymerized monomers: dodecafluoroheptyl methacrylate, 2-(dimethylamino) ethyl methacrylate and styrene, the molar percentages in the polymerized monomers are 58%, 15% and 27% respectively.

[0048] Initiator: azobisisoheptanonitrile, the dosage is 4.8×10 of the total monomer molar content -3 .

[0049] The polymerization reaction temperature was 55° C., and the reaction time was 24 hours.

[0050] Take the product and place it in a high-temperature and high-pressure viscometer, and after it is uniformly dissolved in supercritical carbon dioxide at 45°C, the measured cloud point pressure is 14MPa, and the solution viscosity is 0.74mPa·s.

Embodiment 2

[0052] This embodiment provides a thickener, which is basically the same as in Example 1, except that the amount of the initiator azobisisoheptanonitrile is 4.36×10 of the total molar content of the monomers. -5 .

[0053] Experimental results: After being uniformly dissolved in supercritical carbon dioxide at 45°C, the measured cloud point pressure is 13MPa, and the solution viscosity is 1.3mPa·s, as figure 2 shown.

Embodiment 3

[0055] This embodiment provides a thickener, which is obtained by polymerizing the following polymerizable monomers under the action of an initiator:

[0056] Polymerized monomers: dodecafluoroheptyl methacrylate, 2-(dimethylamino) ethyl methacrylate and styrene, the molar percentages in the polymerized monomers are 58%, 15% and 27% respectively. The initiator is azobisisoheptanonitrile, and the dosage is 2.37×10 of the total monomer molar content -5 .

[0057] The polymerization reaction temperature was 55° C., and the reaction time was 24 hours.

[0058] Experimental results: After being uniformly dissolved in supercritical carbon dioxide at 45°C, the measured cloud point pressure is 12MPa, and the solution viscosity is about 2.0mPa·s, as image 3 shown.

[0059] After the sample of Example 3 was dried, it was compressed into a tablet with KBr, and then measured using a Nicolet Nexus 470 FT-IR infrared spectrometer (Nicolet, USA). Figure 4 Be the infrared spectrogram of...

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Abstract

The invention provides a thickener for supercritical carbon dioxide oil displacement as well as a preparation method and application of the thickener. According to the thickener, fluorine-containing acrylate, tertiary amino-containing acrylate and styrene are used as monomers, and the thickener is formed through free radical polymerization. The thickener for supercritical carbon dioxide oil displacement has low cloud point pressure and excellent tackifying performance, and can be used for a supercritical carbon dioxide oil displacement process for further improving the recovery ratio after oilfield polymer flooding.

Description

technical field [0001] The invention relates to a thickener, in particular to a thickener for supercritical carbon dioxide, and belongs to the technical field of petroleum exploitation. Background technique [0002] In recent years, most of the main land sandstone oil fields in China have entered the ultra-high water cut period after decades of development, and have great potential for tapping potential. Influenced by factors such as layer heterogeneity and gravity differentiation caused by oil-water density difference. [0003] supercritical carbon dioxide (scCO 2 ) flooding is an oil recovery technology with great development potential. The density of the oil displacement system is lower than that of crude oil, and it can produce a floating effect inside the formation. scCO 2 It has the characteristics of strong solubility and strong diffusivity. Carbon dioxide injected into the reservoir can reach a supercritical state under formation pressure and temperature condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/24C08F20/34C08F212/08C09K8/588C09K8/594C09K8/88
CPCC08F220/24C09K8/588C09K8/594C09K8/882C08F20/34C08F212/08Y02P20/54
Inventor 宋考平喻琴侯吉瑞蒋声东柏明星
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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