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Carbon dioxide thickening method and system

A carbon dioxide and system technology, applied in chemical instruments and methods, bulk chemical production, drilling compositions, etc., can solve the problems of high cost, insolubility, damage to the surrounding environment and ozone layer, etc., to achieve convenient implementation, Inexpensive effect

Inactive Publication Date: 2017-12-12
RES INST OF SHAANXI YANCHANG PETROLEUM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this intermolecular interaction is that it is not easily affected by the environment, and the disadvantage is that the interaction force is weak
[0008] 2) Hydrogen bond: Hydrogen bond is a relatively strong intermolecular interaction, but when applied to CO 2 There are two problems in the development of tackifiers: the first is to increase the polarity of the entire polymer and reduce the solubility of the polymer; the second is that CO 2 Oxygen atoms in can act as weak hydrogen bond acceptors to dilute hydrogen bonds
But for how to dissolve transition metals in CO 2 Little is known yet
[0010] 4) Host-guest interaction: The host-guest interaction is characterized by high selectivity and can tolerate complex environmental changes, but for CO 2 The host and object available in has not been reported yet
[0011] 5) Dynamic covalent bond: Dynamic covalent bond is the strongest among all intermolecular interactions, but the polymer obtained by using dynamic covalent bond is likely to have a very high effective molecular weight and cannot be dissolved in CO 2
Due to the use of fluorine-containing raw materials, the system is expensive, has great damage to the surrounding environment and the ozone layer, and is almost impossible to use in actual production

Method used

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  • Carbon dioxide thickening method and system
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  • Carbon dioxide thickening method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Ethanol and n-heptane are used as raw materials to design co-solvents. The polymer solvent uses industrially available polyvinyl acetate (PVAc) (number-average molecular weight of 10000) as a direct means of thickening, and the industrial additive butanedioctyl sulfonate Sodium disodium is used as a surfactant.

[0046] Under normal temperature and pressure, the above thickener raw materials ethanol, n-heptane, polyvinyl acetate and succinyl succinate sodium succinate are 2.5%(v / v): 2.5%(v / v):1 %(W / v): 0.5%(w / v) mixing ratio, based on the volume of liquid carbon dioxide.

[0047] A kind of carbon dioxide thickening system can be obtained by fully stirring. When the system is used, it can be mixed with the required liquid or supercritical carbon dioxide and fully stirred to obtain the required viscosity increasing effect.

[0048] The structural formula of sodium diisooctyl succinate sulfonate used in this example is as follows:

[0049]

[0050] The structure of polyvinyl ace...

Embodiment 2

[0053] Use absolute ethanol and n-heptane as raw materials to design co-solvents, use industrially available polyvinyl acetate (PVAc) (number average molecular weight of 20000) as a direct means of thickening, and use industrial additives dioctyl sulfonate Sodium diacid (trade name "Aerosol OT") is used as a surfactant.

[0054] Under normal temperature and pressure, the above thickener raw materials ethanol, n-heptane, polyvinyl acetate (molecular weight 20000) and dioctyl sulfonated sodium succinate are 1% (v / v): 4% (v / v) ): 1% (w / v): 1% (w / v) ratio of mixing, based on the volume of liquid carbon dioxide, fully stirred to obtain a carbon dioxide thickening system. When the system is in use, first heat the system to 120 degrees, then pump CO 2 Up to 17 MPa, and then stirring at 2000 rpm to drop to room temperature, the viscosity was 2.45 mPa·s.

Embodiment 3

[0056] Use methanol and petroleum ether as raw materials to design co-solvents, use industrially available polyvinyl acetate (PVAc) (number average molecular weight of 10000) as a direct means of thickening, and use industrial additives succinyl succinic acid Sodium is used as a surfactant.

[0057] Under normal temperature and pressure, the above thickener raw materials methanol, petroleum ether, polyvinyl acetate and succinate sodium succinate are 2.5% (v / v): 2.5% (v / v): 0.5% (w / v): 1% (w / v), based on the volume of liquid carbon dioxide.

[0058] Under normal temperature and pressure, a carbon dioxide thickening system can be obtained by fully stirring. When the system is used, it can be mixed with the required liquid or supercritical carbon dioxide and fully stirred to obtain the desired viscosity increasing effect. The viscosity is 1.14mPa·s at room temperature and 7.0MPa.

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Abstract

The invention relates to a carbon dioxide thickening method and system. The system comprises a cosolvent, a surfactant and a polymer solvent and can be used for increasing the apparent viscosity of carbon dioxide (CO2) at liquid state and super-critical state, wherein the cosolvent is composed of an aliphatic hydrocarbon organic solvent and an alcohol organic solvent. The tackifying effect can be maximized by way of combining direct tackifying and cosolvent tackifying. When used in the process of thickening carbon dioxide, the whole carbon dioxide thickening system is of a single phase with the viscosity up to 1.38mPa.s at room temperature when CO2 is higher than critical pressure (6.0MPa); the thickening system is low in the price of raw materials, convenient to implement, and applicable to fracturing improvement of large-scale unconventional oil-gas reservoirs.

Description

Technical field [0001] The invention relates to a method and a thickening system for thickening liquid and supercritical carbon dioxide using organic solvents, organic surfactants and polymer solvents, and belongs to the technical field of oilfield supplies. Background technique [0002] Liquid CO 2 It is a low-density, low-viscosity fluid. When used as the main component of fracturing fluid, it has the disadvantages of poor sand-carrying performance and serious fluid loss. To overcome such shortcomings, it is necessary to use thickening and thickening agents for modification. [0003] When water or other organic solvents are used to increase the viscosity, building a molecular-level spatial network structure in the fluid is a common and relatively mature method. Researchers often develop long-chain polymers that are soluble in the solvent and use the method of entanglement between polymer chains to build a network structure. After the spatial network structure is formed, the mut...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68Y02P20/54
Inventor 黄程张东晓王香增申峰孙晓
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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