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Fluorinated polyurethane thickener applied to supercritical CO2 tackification and preparation method thereof

A polyurethane thickener and supercritical technology, applied in the petrochemical field, can solve the problems of increasing construction difficulty, formation damage, and large usage, and achieve the effects of increasing mutual solubility, reducing usage, and increasing molecular weight

Active Publication Date: 2016-02-03
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its usage is large, which increases the difficulty of construction and causes great damage to the formation.

Method used

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  • Fluorinated polyurethane thickener applied to supercritical CO2 tackification and preparation method thereof
  • Fluorinated polyurethane thickener applied to supercritical CO2 tackification and preparation method thereof
  • Fluorinated polyurethane thickener applied to supercritical CO2 tackification and preparation method thereof

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preparation example Construction

[0040] In order to make the above-mentioned fluorine-containing polyurethane thickener, the present invention also provides a preparation method of the thickener, comprising the following steps:

[0041] 1) Add diisocyanate and polyethylene glycol into a 500mL dry three-neck flask equipped with a stirrer, condenser and dropping funnel, raise the temperature to 80°C, add the catalyst dibutyltin dilaurate, react for 2 hours, then add trimethylol Propane continued to react for 1.5h to obtain -NCO-terminated polyurethane.

[0042] 2) Add castor oil to the above product and stir well, after cooling to 30°C, add polyoxyethylene sorbitan ether and stir well to make the system evenly dispersed, then add perfluorooctylethylene and dodecafluoroheptyl acrylate, Raise the temperature to 80°C, add the initiator, and react for 2 hours to obtain the supercritical CO 2 Fluorinated polyurethane thickener for fluid viscosification.

[0043] The diisocyanate, polyethylene glycol, trimethylolpr...

Embodiment 1

[0046] A supercritical CO 2 Fluorinated polyurethane thickener for fluid viscosification, containing 10% diisocyanate, 5% polyethylene glycol, 5% trimethylolpropane, 1% catalyst, 1% initiator by mass fraction , 3% sorbitan polyoxyethylene ether, 3% perfluorooctylethylene, 3% dodecafluoroheptyl acrylate (FA), and the balance is castor oil.

[0047] In this embodiment, the diisocyanate is toluene diisocyanate (TDI), the polyethylene glycol is polyethylene glycol 200 containing polyether bonds, the catalyst is dibutyltin dilaurate (T-12), and the initiator is potassium persulfate.

[0048] The trimethylolpropane, sorbitan polyoxyethylene ether, perfluorooctylethylene, and dodecafluoroheptyl acrylate are all industrial grades.

[0049] The purity of the castor oil is greater than 95%.

[0050] The above-mentioned unconventional oil and gas reservoir CO 2 A dry fracturing thickener and a preparation method thereof, comprising the following steps:

[0051] 1) Add 10% diisocyanat...

Embodiment 2

[0059] A supercritical CO 2 Fluid viscosifying fluorine-containing polyurethane thickener, by mass fraction, including 15% diisocyanate, 8% polyethylene glycol, 8% trimethylolpropane, 2% catalyst, 2% initiator , 5% sorbitan polyoxyethylene ether, 5% perfluorooctylethylene, 5% dodecafluoroheptyl acrylate (FA), and the balance is castor oil.

[0060] In this embodiment, the diisocyanate is diphenylmethane diisocyanate (MDI), the polyethylene glycol is polyethylene glycol 400 containing polyether bonds, the catalyst is dibutyltin dilaurate (T-12), and the initiator is polyethylene glycol 400. Potassium sulfate.

[0061] The trimethylolpropane, sorbitan polyoxyethylene ether, perfluorooctylethylene, and dodecafluoroheptyl acrylate are all industrial grades.

[0062] The purity of the castor oil is greater than 95%.

[0063] The above-mentioned unconventional oil and gas reservoir CO 2 A dry fracturing thickener and a preparation method thereof, comprising the following steps: ...

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Abstract

The invention discloses a fluorinated polyurethane thickener applied to supercritical CO2 tackification and a preparation method thereof, belongs to the field of petrifaction, and in particular relates to a thickener for supercritical CO2 dry-method fracturing and a preparation method thereof. The invention aims to provide the thickener special for supercritical CO2 dry-method fracturing and the preparation method thereof, wherein the thickener has good tackifying performance, can be easily dissolved in CO2 fluid, and has a stable system. The thickener is prepared from the following components in parts by fraction: 10 to 15 percent of diisocyanate, 5 to 8 percent of polyethylene glycol, 5 to 8 percent of trimethylolpropane, 1 to 2 percent of catalyst, 1 to 2 percent of initiator, 3 to 5 percent of sorbitan polyoxyethylene ether, 3 to 5 percent of perfluor octyl ethylene, 3 to 5 percent of dodecafluoroheptyl acrylate, and the balance of castor oil. The thickener has good tackifying performance, can be easily dissolved in the CO2 fluid, and has the stable system.

Description

technical field [0001] The invention belongs to the petrochemical field, in particular to a supercritical CO 2 Thickener for dry fracturing and preparation method thereof. Background technique [0002] Supercritical CO 2 It refers to the carbon dioxide fluid whose temperature and pressure are higher than its critical value (T=31℃, P=7.38MPa), the gas-liquid interfacial tension is zero, the self-diffusion coefficient and viscosity are close to gas, and it has a flow behavior similar to gas. The density is close to that of liquid. Nowadays, supercritical fluids are widely used in fields such as extraction, biotechnology, material processing and chemical engineering reactions, environmental protection and governance. [0003] In recent years, it has attracted much attention in the exploitation of oil and gas fields, especially in the exploitation of unconventional oil and gas reservoirs. Hydraulic fracturing is an effective means of increasing production in low permeability ...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F214/18C08F220/22C08G18/66C08G18/48C08G18/32C09K8/62
CPCY02P20/54
Inventor 张锋三吴金桥申峰张军涛任婷杨洪郭庆孙晓高志亮景丰
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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