A kind of preparation method of siloxane polymer supercritical carbon dioxide thickener for fracturing

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 little environmental pollution, low raw material cost, low friction, and little damage to the formation; the physical and chemical properties of the thickener during fracturing change little and are stable. 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 Pointing forward, the contagion coefficient is small, which seriously hinders the exploitati...

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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

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