Supercritical carbon dioxide solid thickening agent as well as preparation method and application thereof

A carbon dioxide and thickener technology, applied in chemical instruments and methods, bulk chemical production, drilling compositions, etc., can solve the problems of unfavorable storage, transportation and environmental protection, high cost, high consumption, etc., and achieve improvement Oil recovery, good thickening, good storage effect

Inactive Publication Date: 2015-03-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, SC-CO 2 The macromolecular thickeners used mainly include fluorine-containing polymers and silicon-containing polymers. The former is the most effective type of thickening, but there are problems of large dosage and high cost; silicon-containing polymers are the most cost-effective. An ideal class, but contains a large amount of organic solvents, which is not conducive to storage, transportation and environmental protection

Method used

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  • Supercritical carbon dioxide solid thickening agent as well as preparation method and application thereof

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preparation example Construction

[0037] The present invention also provides the preparation method of described supercritical carbon dioxide solid thickener, comprises the following steps:

[0038] (1) Mix components (a), (b), (e) and (f) uniformly, and react at 70°C-100°C for 3-8h;

[0039] (2) Add (c) and (d) and mix well, stop stirring, and continue to react at 70°C-100°C for 3-8h;

[0040] (3) remove the solvent in the above-mentioned reaction product;

[0041] (4) Lower the temperature to below 30°C, and shear granulate to obtain the product; the particle size is 10-35um, preferably 12-25um.

[0042] In a specific embodiment of the present invention, step (3) is carried out under the condition of a vacuum degree of 0.01-0.1 MPa.

[0043] The present invention also provides the use of the supercritical carbon dioxide solid thickener in oil field development to enhance oil recovery.

[0044] The thickener of the present invention can be injected into the stratum to be treated by directly adding the thic...

Embodiment 1

[0065] Raw material composition and ratio

[0066] (a) diphenylmethane diisocyanate (250.2g, 1mol), (b) polydimethylsiloxane (85.0g, 0.7mol) with a viscosity of 50mPa.s, (c) trifluoroethanol (10.1g, 0.1 mol) and (d) trimethylolpropane (19.9g, 0.15mol) ratio of substance is 1.0: 0.7: 0.1: 0.15; (e) acetone and (f) dibutyltin dilaurate account for (a) , (b), (c) and (d) 15% and 0.01% of the total mass.

[0067] Preparation:

[0068] Turn on the mixer, mix (a), (b), (e), (f) evenly, and react at 80°C for 4 hours; then add (c), (d) and mix well, stop stirring, and continue the reaction at 80°C 8h; under the condition of vacuum degree of 0.02MPa, remove acetone; then lower the temperature to 25°C and shear granulate to obtain the product.

Embodiment 2

[0070] Raw material composition and ratio

[0071] Weigh 222.3g component (a) isophorone diisocyanate (1.0mol), according to the mass ratio of component (a): (b): (c): (d) is 1.0: 0.9: 0.02: 0.05 Weighing component (b) viscosity is the polydimethylsiloxane of 5000mPa.s, component (c) octafluoropentanol and component (d) glycerin respectively, and make component (e) acetone and component (f) Dibutyltin dilaurate accounts for 80% and 0.1% of the total mass of (a), (b), (c) and (d) respectively.

[0072] Preparation method: Turn on the mixer, mix (a), (b), (e), (f) evenly, and react at 70°C for 6 hours; then add (c), (d) and mix evenly, stop stirring, and Continue to react at ℃ for 5 hours; remove acetone under the condition of vacuum degree of 0.02MPa; then lower the temperature to 25℃ and shear granulate to obtain the product.

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Abstract

The invention discloses a supercritical carbon dioxide solid thickening agent which is characterized by consisting of the following components: (a) diisocyanate, (b) terminated hydroxy silicone oil, (c) alkanol substituted by one or more fluorine atoms and containing 2-12 carbon atoms, preferably containing 2-6 carbon atoms, (d) ternary alkanol containing 3-9 carbon atoms, preferably containing 3-6 carbon atoms, (e) an organic solvent and (f) a catalyst. The invention also provides a preparation method and an application of the supercritical carbon dioxide solid thickening agent.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide solid thickener and its preparation method and application. Background technique [0002] Supercritical carbon dioxide (SC-CO 2 ) refers to the carbon dioxide fluid whose temperature and pressure are higher than its critical value (T=31.1℃, 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 , while the density is close to that of liquid. Today SC-CO 2 It has been widely used in extraction, biotechnology, material processing, chemical reaction engineering, environmental protection and governance and other fields. [0003] In recent years, gas injection enhanced oil recovery technology has attracted much attention in oilfield development, among which SC-CO injection 2 Not only can enhance oil recovery, but also achieve CO 2 Geological storage. However, SC-CO 2 Due to the density and v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C08G18/65C08G18/61C08G18/32C08G18/38C08G18/10
CPCC08G18/10C08G18/61C08G18/6517C09K8/594C08G18/3206C08G18/3812Y02P20/54
Inventor 汪庐山刘巍王涛靳彦欣徐鹏宋岱锋薄纯辉王昊张光焰江汇
Owner CHINA PETROLEUM & CHEM CORP
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