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A kind of preparation method of acrylate/siloxane polymer supercritical carbon dioxide thickener

A technology based on acrylate and carbon dioxide, which is applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve problems such as many follow-up problems, serious formation damage, and expensive fluorine-containing substances, and achieve reduction The effect of dosage

Active Publication Date: 2021-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such fluorine-containing substances have great damage to the formation, pollute groundwater resources, cause environmental pollution, and cause many follow-up 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, due to the price, environmental pollution and few available types, it has hindered the wide use of fluorine-containing substances in oilfield fracturing stimulation to a certain extent.
The thickening effect of hydrocarbon polymers is not ideal

Method used

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  • A kind of preparation method of acrylate/siloxane polymer supercritical carbon dioxide thickener
  • A kind of preparation method of acrylate/siloxane polymer supercritical carbon dioxide thickener
  • A kind of preparation method of acrylate/siloxane polymer supercritical carbon dioxide thickener

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Embodiment 1

[0048] Embodiment 1, a kind of preparation method of acrylate / siloxane supercritical carbon dioxide thickener comprises steps as follows:

[0049] (1) Add 9.21 g of glycerin to a 500 mL three-necked flask equipped with a reflux device, catalyst Mg-Al-HT accounting for 1.5% of the total system, and hydroquinone accounting for 2% of the total system. Then start to stir and heat up. When the temperature rises to 105°C, 30.036 g of methyl methacrylate is gradually added dropwise to carry out transesterification reaction. After 6 hours of reaction, the liquid in the flask is filtered, and the filtrate obtained by separating the catalyst and polymerization inhibitor is decompressed. Distillation gives a colorless and transparent product glycerol trimethacrylate.

[0050] (2) Add 0.1525g glycerol trimethacrylate into a 50mL three-necked flask equipped with a reflux device, stir and raise the temperature to 90°C, add 30ppm chloroplatinic acid for activation for 2 hours; keep the tempe...

Embodiment 2

[0052] Embodiment 2, as described in embodiment 1, operation steps are consistent, difference is that the hydroquinone consumption used in step (1) is 2.5%.

Embodiment 3

[0053] Embodiment 3, as described in Embodiment 1, the difference is that the glycerol is 4.605g in the step (1), and the reaction temperature is 110°C.

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Abstract

The invention relates to a preparation method of an acrylate / siloxane polymer supercritical carbon dioxide thickener. The method comprises: (1) in the presence of a catalyst and a polymerization inhibitor, making glycerin and methyl methacrylate carry out transesterification reaction to obtain glycerol trimethacrylate; (2) in the presence of catalyst chloroplatinic acid, making The glyceryl trimethacrylate prepared in step (1) is subjected to hydrosilylation reaction with dodecamethyldihydrohexasiloxane to prepare the acrylate / siloxane polymer supercritical carbon dioxide thickener. The monomer used in the invention has high synthesis efficiency, and the prepared polymer has excellent viscosity-increasing performance, less usage amount and better temperature and pressure resistance. The product of the invention is non-toxic, reduces pollution to ground water and surface water in formations, and has excellent thickening effect.

Description

technical field [0001] The invention relates to a preparation method of an acrylate / siloxane polymer supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide dry fracturing technology 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. It can reduce the damage to the bottom layer caused by soil expansion and reduce formation damage; it is sensitive to water. The formation has a better mitigation effect. 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. The viscosity is low, and the low viscosity of the fracturing fluid affects the sand-carrying and fluid loss properties of the fracturing fluid, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/20C08G77/14C08G77/06C09K8/62
CPCC08G77/06C08G77/14C08G77/20C09K8/62Y02P20/54
Inventor 王彦玲刘斌梁雷巩锦程汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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