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A kind of preparation method of hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener

A technology of carbon dioxide and hydrogen siloxane, applied in the direction of chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve the problems of unsatisfactory thickening effect, environmental pollution, high biological toxicity, etc., and achieve excellent Thickening effect, improvement of economy, effect of reducing dosage

Active Publication Date: 2021-11-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical CO 2 The viscosity is low, only 0.02mPa·s~0.05mPa·s, this viscosity is difficult to meet the requirements of carrying proppant into the bottom layer and the fluid loss is large, the fracturing effect is not ideal
[0003] At present, fluorine-containing compounds or polymers are most commonly used as supercritical carbon dioxide thickeners. Such substances are harmful to the formation, pollute groundwater resources, cause environmental pollution, have high biological toxicity, and fluorine-containing substances are expensive.
Reasons such as price, environmental pollution and few available types have hindered the wide use of fluorine-containing substances in oilfield fracturing stimulation to a certain extent
Although hydrocarbon polymers are low in cost and less polluting, their thickening effect is not ideal

Method used

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  • A kind of preparation method of hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener
  • A kind of preparation method of hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener
  • A kind of preparation method of hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, a kind of preparation method of hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener HBD-2 is as follows:

[0032] Add 35.7900g of triethylene glycol dimethacrylate into a 250mL three-necked flask equipped with a reflux device, start stirring and raise the temperature, and when the temperature reaches 90°C, add 30ppm chloroplatinic acid for activation for 2 hours. Then, drop 12.0255 g of 1,3,5,7-tetramethylcyclotetrasiloxane into it with a constant pressure dropping funnel, keep the temperature at 90°C, and react for 6 hours to obtain a colorless and transparent product (HBD-2) . The weight average molecular weight was 9180.

[0033] The infrared spectrum of the obtained product is as figure 1 As shown, 1710cm -1 The spectrum of 1,3,5,7-tetramethylcyclotetrasiloxane ( figure 2 ) C=O stretching vibration peak not in ), 2100cm -1 The obvious weakening of the Si-H stretching vibration peak represents the successful completio...

Embodiment 2

[0035] As described in Example 1, the difference is that the amount of triethylene glycol dimethacrylate used is 28.6320 g.

Embodiment 3

[0037] As described in Example 1, the difference is that triethylene glycol dimethacrylate is 42.9480g, and the catalyst activation temperature is 95°C. The reaction temperature is 95°C.

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Abstract

The invention relates to a preparation method of a hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener. The method comprises: reacting triethylene glycol dimethacrylate and 1,3,5,7-tetramethylcyclotetrasiloxane through silyl hydrogen reaction to generate a polymer in the presence of a catalyst. The hyperbranched hydrogen-containing siloxane polymer supercritical carbon dioxide thickener of the present invention has good temperature resistance and pressure resistance, and can be applied to achieve thickening performance under different temperature and pressure conditions; compatibility with various co-solvents Good; non-toxic, safe to use, less damage to the formation; less usage, good thickening effect.

Description

technical field [0001] The invention relates to a preparation method of a hyperbranched hydrogen-containing siloxane supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] The exploration and development of unconventional oil and gas resources in my country is in its infancy. Unconventional oil and gas resources are not only faced with core technological breakthroughs, but also restricted by complex geographical issues and ecological water resources and environmental issues to be solved. With the development of tight gas and shale gas in China, there are more and more cases of "Wanfang liquid and thousands of square sand", and the problems of waste of water resources and environmental pollution have gradually emerged. Liquid CO 2 Fracturing technology emerged as a clean, environmentally friendly and low-harm environment-friendly fracturing technology. Liquid CO 2 Fracturing technology can not on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/50C09K8/62
CPCC08G77/50C09K8/62Y02P20/54
Inventor 王彦玲刘斌李强梁雷巩锦程汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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