Preparation method of acrylate/siloxane polymer supercritical carbon dioxide thickener

Abstract

The invention relates to a preparation method of an acrylate / siloxane polymer supercritical carbon dioxide thickener. The method includes: (1) in the presence of a catalyst and a polymerization inhibitor, carrying out ester exchange reaction on glycerin and methyl methacrylate to obtain glyceryl trimethacrylate; and (2) in the presence of a catalyst chloroplatinic acid, carrying out hydrosilylation reaction on the glyceryl trimethacrylate prepared in step (1) and dodecyldihydrohexasiloxane to prepare the acrylate / siloxane polymer supercritical carbon dioxide thickener. The monomers used in theinvention have high synthesis efficiency, and the prepared polymer has excellent tackifying performance, is small in dosage, and has good temperature resistance and pressure resistance. The product is non-toxic, reduces pollution to stratum underground water and surface water, and has excellent thickening effect.

Description

technical field [0001] The invention relates to a preparation method of an acrylate / siloxane polymer supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide dry fracturing technology is a new type of measure to increase production and injection in oilfields. It has less environmental pollution, considerable economic benefits, and poor frictional resistance. It can reduce the damage to the bottom layer caused by soil expansion and reduce formation damage; it is sensitive to water. The formation has a better mitigation effect. However, due to the low viscosity of carbon dioxide in the supercritical state (0.02-0.05mPa·s in the supercritical state), it has better fluidity, shorter residence time and smaller cracks during formation fracturing. The viscosity is low, and the low viscosity of the fracturing fluid affects the sand-carrying and fluid loss properties of the fracturing fluid, ...

AI Technical Summary

Problems solved by technology

Such fluorine-containing substances have great damage to the formation, pollute groundwater resources, cause environmental pollution, and cause many follow-up problems, and fluorine-containing substances are expensive and require a large investment. There are fewer types of fluorine-containing substances used for thickening. Although the solubility is good, due to the price, environmental pollution and few available types, it has hindered the wide use of fluorine-containing substances in oilfield fracturing stimulation to a certain extent.

The thickening effect of hydrocarbon polymers is not ideal

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