Preparation method of tetraphenylurea siloxane polymer supercritical carbon dioxide thickener

A technology of benzene tetraurea siloxane and carbon dioxide is applied in the field of preparation of supercritical carbon dioxide thickener of benzene tetraurea siloxane polymer, which can solve the problem of hindering the fracturing and stimulation of fluorine-containing substances and the high price of fluorine-containing substances. , groundwater resource pollution and other problems, to achieve the effect of excellent thickening effect, good compatibility and little formation damage

Active Publication Date: 2018-05-15
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Application Information

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Problems solved by technology

Such substances are more harmful to the formation, and cause environmental pollution, leading to pollution of groundwater resources. There are many subsequent environmental problems, and fluorine-containing substances are expensive and require a large investment. There are fewer types of fluorine-containing substances used for thickening. , although the solubility is good, but due to the price and environmental pollution problems and the few available types, to a certain extent, it hinders the wide use of fluorine-containing substances in oilfield fracturing stimulation

Method used

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  • Preparation method of tetraphenylurea siloxane polymer supercritical carbon dioxide thickener

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Embodiment 1

[0055] Embodiment 1, a kind of preparation method of siloxane polymer supercritical carbon dioxide thickener comprises steps as follows:

[0056] (1) Preparation of pyromellitic azide

[0057] Under nitrogen protection, 1.4 g of sodium azide was dissolved in deionized water into a three-necked flask, and cooled to 0°C. In another single-necked flask, dissolve 3g of pyromellitic chloride in 30mL of tetrahydrofuran, stir evenly and cool to room temperature, slowly drop the dissolved 3g of pyromellitic chloride into the low-temperature solution of sodium azide, and after 1.5h, a white Precipitated sodium pyromellityl azide. The white precipitated solid was dissolved in 30 mL of toluene at 0°C and stirred for 4 h, the toluene layer was separated, washed with water and saturated brine, dried over magnesium sulfate and filtered to obtain 3 g of pyromellitic azide.

[0058] (2) Preparation of amino side chain modified siloxane polymer

[0059] Under the protection of nitrogen, add...

Embodiment 2

[0062] Example 2, as described in Example 1, the operation steps are the same, the difference is that the azide used in the step (1) is potassium azide, and the usage amount is 1.8g.

Embodiment 3

[0063] Embodiment 3, as described in embodiment 1, the difference is that toluene is 20mL in the step (1).

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Abstract

The invention provides a preparation method of a tetraphenylurea siloxane polymer supercritical carbon dioxide thickener. The method comprises the following steps: (1) azide and 1,2,4,5-benzenetetracarbonyl tetrachloride are reacted in order to obtain pyromellit azide; (2) cyclotetrasiloxane and monoamino propyl bis(alkyloxy) alkyl silane are hydrolyzed, and potassium hydroxide is added in order to obtain azeotropic backflow liquid; cationic resin is added into the azeotropic backflow liquid in order to obtain an amino side chain modified siloxane polymer; (3) the pyromellit azide and the amino side chain modified siloxane polymer are reacted in order to obtain the tetraphenylurea siloxane polymer. The tetraphenylurea siloxane polymer has good temperature resistance and pressure resistanceperformances, and can be used as the supercritical carbon dioxide thickener, which is suitable for realizing thickening performance under the conditions at different temperatures and pressures, and the polymer is used for fracturing and yield increase of oil fields.

Description

technical field [0001] The invention relates to a preparation method of a pyrenetetraurea siloxane polymer supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide fracturing is a new type of measure to increase production and injection in oilfields. It has less environmental pollution, considerable economic benefits, and poor frictional resistance, which can reduce the damage to the bottom layer caused by soil expansion and reduce formation damage; it is effective for water-sensitive formations. better relief. However, due to the low viscosity of carbon dioxide in the supercritical state (0.02-0.05mPa·s in the supercritical state), it has better fluidity, shorter residence time and smaller cracks during formation fracturing. Low viscosity will also cause weak sand-carrying ability, and carbon dioxide will easily enter the upper formation, reducing the fracturing area and hindering t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C08G77/26C08G77/06C09K8/62
CPCC08G77/06C08G77/26C08G77/388C08G77/80C09K8/62Y02P20/54
Inventor 左家强王彦玲王增林李爱山张全胜郑彬涛陈凯张子麟陈晓媛李强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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