Preparation method of fracturing supercritical carbon dioxide thickener containing siloxane polymer

A carbon dioxide and polymer technology, applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc. Thickening effect, enhanced fracturing performance, excellent thickening performance

Active Publication Date: 2018-05-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, supercritical carbon dioxide has low viscosity, good fluidity, short residence time in the formation, small fractures, and low viscosity in the supercritical state, so that the sediment carried is not enough to support the fractures, and the crude oil cannot flow out in streams; pure carbon dioxide easily enters the upper formation and occurs Fingering, low contagion coefficient, seriously hindering crude oil exploitation
[0003] Adding a thickener to supercritical carbon dioxide is the best way to thicken supercritical carbon dioxide. Fluorine compounds are the most widely studied and can directly thicken carbon dioxide. However, fluorine is highly toxic and easily soluble in polar substances, which is not conducive to formation Flowback, follow-up environmental problems are many, and fluorine-containing substances are expensive, and there are few types of fluorine-containing substances used for thickening. Affected by the above factors, it hinders the use of fluorine-containing substances for fracturing stimulation in oil fields

Method used

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  • Preparation method of fracturing supercritical carbon dioxide thickener containing siloxane polymer
  • Preparation method of fracturing supercritical carbon dioxide thickener containing siloxane polymer
  • Preparation method of fracturing supercritical carbon dioxide thickener containing siloxane polymer

Examples

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Effect test

Embodiment 1

[0060] A preparation method of siloxane polymer supercritical carbon dioxide thickener for fracturing, the steps are as follows:

[0061] 1) Preparation of modified polydimethylsiloxane with aminopropyl terminated vinyl side chain

[0062] Under the protection of nitrogen, add 2.1 g of deionized water dropwise to a three-neck flask 1 containing 10.4g of aminopropyltriethoxysilane at 25°C and react for 5 hours. Dissolve the viscous hydrolysate in 100mL of toluene at 25°C and stir for 1-7 hours. ,Stand for layers, separate the remaining deionized water, and remove toluene by rotary evaporation at 100°C. The remaining product was added to a three-necked flask 2 containing 35.4g of tetramethyltetravinylcyclotetrasiloxane and 63g of octamethylcyclotetrasiloxane, and 0.25g of tetramethylammonium hydroxide was added and reacted at 85°C for 18h, and then removed. Set the layers to remove tetramethylammonium hydroxide, wash with saturated brine, remove ionized water and low-boiling substan...

Embodiment 2

[0070] As described in Example 1, the difference is that the amount of deionized water used in step (1) is 1.1 g.

Embodiment 3

[0072] As described in Example 1, the difference is that the amount of tetramethyltetravinylcyclotetrasiloxane used in step (1) is 45 g.

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Abstract

The invention relates to a preparation method of a fracturing supercritical carbon dioxide thickener containing a siloxane polymer. The method comprises the steps: carrying out a reflux reaction on anaminopropyl alkoxy silane hydrolysis product, tetravinyl tetramethylcyelo tetrasiloxane and other cyclosiloxane under the catalysis of an alkali to prepare aminopropyl-terminated vinyl side chain modified polydimethylsiloxane; then, carrying out an acylchloride reaction on the aminopropyl-terminated vinyl side chain modified polydimethylsiloxane and aroyl chloride to prepare an aroylamino-terminated side chain modified siloxane polymer; dropwise adding an organic solvent solution of chloroplatinic acid to make the aroylamino-terminated side chain modified siloxane polymer react with hydrosiloxane to obtain a product. The preparation method is high in monomer synthesis efficiency, the siloxane polymer serving as phenyl and acylamino in the fracturing supercritical carbon dioxide thickenerproduct is capable of improving the thickening effect, and when the dosage of the product is relatively low, the thickening performance is good, and the pollution to underground water and surface water of a stratum is reduced.

Description

Technical field [0001] The invention relates to a preparation method of a siloxane polymer supercritical carbon dioxide thickener for fracturing, and belongs to the technical field of petroleum exploitation. Background technique [0002] As a new measure to increase production and injection in oilfields, carbon dioxide fracturing has low environmental pollution, low raw material cost, low friction, and low damage to the formation; the physical and chemical properties of the thickener during fracturing have minimal changes and stable properties. However, supercritical carbon dioxide has low viscosity, good fluidity, short stratum residence time, small cracks, and low supercritical viscosity, so that the carrying sediment is not enough to support the cracks, and crude oil cannot flow out in strands; pure carbon dioxide is easy to enter the upper strata and occur Pointing forward, the ripple factor is small, seriously hindering crude oil extraction. [0003] Adding a thickener to sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/26C08G77/20C08G77/06C08G77/385C08G77/44C09K8/68
CPCC08G77/06C08G77/20C08G77/26C08G77/385C08G77/44C09K8/68C09K8/885Y02P20/54
Inventor 王彦玲李强尹子辰李永飞汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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