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Preparation method of hyperbranched hydrosiloxane supercritical carbon dioxide thickener

A technology of carbon dioxide and hydrogen siloxane, applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve the price and environmental pollution that hinder fluorine-containing substances from fracturing stimulation and proppant entering the bottom layer Requirements and problems such as large filtration loss, expensive fluorine-containing substances, etc., to achieve excellent thickening effect, good compatibility, and safe use

Active Publication Date: 2020-03-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • 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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  • Preparation method of hyperbranched hydrosiloxane supercritical carbon dioxide thickener
  • Preparation method of hyperbranched hydrosiloxane supercritical carbon dioxide thickener
  • Preparation method of hyperbranched hydrosiloxane supercritical carbon dioxide thickener

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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 hydrosiloxane supercritical carbon dioxide thickener. The method includes: in the presence of a catalyst, carrying out silicon-hydrogenreaction on triethylene glycol dimethacrylate and 1, 3, 5, 7-tetramethylcyclotetrasiloxane to generate a polymer. The hyperbranched hydrosiloxane polymer supercritical carbon dioxide thickener disclosed by the invention has good temperature resistance and pressure resistance, and can realize thickening performance under different temperature and pressure conditions, has good compatibility with various cosolvents, is non-toxic and safe to use, has small damage to the stratum, is small in dosage, and has 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 Applications(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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