A kind of preparation method of trapezoidal branched chain modified siloxane polymer supercritical carbon dioxide thickener

A carbon dioxide and polymer technology, applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve problems hindering the application and promotion of fracturing stimulation, reduce the amount of co-solvent, and reduce production costs , the effect of improving solubility

Active Publication Date: 2020-12-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The above two types of thickeners have hindered their application and promotion in fracturing stimulation due to their own disadvantages

Method used

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  • A kind of preparation method of trapezoidal branched chain modified siloxane polymer supercritical carbon dioxide thickener
  • A kind of preparation method of trapezoidal branched chain modified siloxane polymer supercritical carbon dioxide thickener
  • A kind of preparation method of trapezoidal branched chain modified siloxane polymer supercritical carbon dioxide thickener

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Embodiment Construction

[0011] Technical scheme of the present invention is as follows:

[0012] A preparation method of a trapezoidal branched modified siloxane polymer supercritical carbon dioxide thickener, comprising the steps of:

[0013] (1) Preparation of functional group-terminated linear polydimethylsiloxane polymer

[0014] Add cyclic siloxane, small molecule end-capping agent, toluene and basic catalyst into the reaction kettle, blow in nitrogen, seal the reaction kettle, react at 100-115°C for 2-11h, and then raise the temperature to 140°C React at -155°C for 30-40 minutes, cool down to room temperature, remove the toluene solvent and low-molecular siloxane low boilers in a vacuum, and obtain a functional group-terminated linear polydimethylsiloxane polymer;

[0015] The cyclic siloxane is octamethylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, octavinylcyclotetrasiloxane, tetramethyltetrahydrocyclotetrasiloxane, six One or more of methyldihydrocyclotetrasiloxane, hexamet...

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Abstract

The invention relates to a preparing method of a trapezoid branched chain modified siloxane polymer supercritical carbon dioxide thickener. The method includes the steps of firstly, preparing a functional group terminal-sealed linear polydimethylsiloxane polymer; secondly, preparing a trapezoid hydrogenous methylsiloxane polymer; thirdly, dropping a chloroplatinic acid catalyst in the functional group terminal-sealed linear polydimethylsiloxane polymer and the trapezoid hydrogenous methylsiloxane polymer at 65-125 DEG C, conducting a reaction to prepare the product, namely a trapezoid branchedchain modified siloxane polymer. By introducing a branch chain with a functional group into a thickener molecular, the dissolubility of the thickener in the supercritical carbon dioxide is improved,the excellent thickening performance can be realized, the proppant carrying capacity is improved, and the fluid loss coefficient is reduced.

Description

technical field [0001] The invention relates to a preparation method of a trapezoidal branched modified siloxane polymer supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] As a traditional enhanced oil recovery technology, hydraulic fracturing has great advantages in oilfield stimulation and development. However, the disadvantages of large water consumption, reservoir damage, and groundwater pollution still hinder the development of this technology. In view of the many defects of hydraulic fracturing technology, finding a new type of fracturing technology that is clean, efficient and pollution-free has become the key to increasing oilfield production. As a new type of oil field increase production and injection measures, carbon dioxide fracturing technology has the advantages of improving greenhouse effect, low reservoir damage and low water pollution and use, considerable economic benefits, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/44C09K8/62
CPCY02P20/54
Inventor 王彦玲李强张传保戎旭峰李永飞汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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