A kind of preparation method and application of supercritical carbon dioxide thickener

Abstract

The invention relates to a preparation method and application of a supercritical carbon dioxide thickener. First react ethoxytrimethylsilane and vinyltriethoxysilane to prepare vinyltris(trimethylsiloxane)silane, then make vinyltris(trimethylsiloxane)silane and ethyl The reaction of diol dimethacrylate produces a polymer, that is, a supercritical carbon dioxide thickener. When the prepared polymer is used as a supercritical carbon dioxide thickener, the 0.5% polymer solution has obvious thickening effect.

Description

technical field [0001] The invention relates to a preparation method and application of a supercritical carbon dioxide thickener, which belongs to the technical field of petroleum exploitation. Background technique [0002] In order to reduce water resource consumption and environmental pollution, researchers began to focus on SC-CO 2 Fracturing fluid technology. The United States began to study supercritical CO at the end of the 20th century 2 Drilling technology, "Coiled Tubing Drilling Using Supercritical Carbon Dioxide" was completed in 1998. At present, some research groups at home and abroad have launched research on CO 2 Research on supercritical fracturing technology, Richard S. systematically studied CO 2 Pros and Cons of Working Fluids for Shale Gas: (1) CO 2 Potential advantage of CO 2 The fracturing effect and fracture expansion are better than hydraulic fracturing. Under constant pressure test conditions, CO 2 Adsorption is better than CH 4 , which is con...

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Problems solved by technology

The United States began to study supercritical CO at the end of the 20th century 2 Drilling technology, "Coiled Tubing Drilling Using Supercritical Carbon Dioxide" was completed in 1998. At present, some research groups at home and abroad have launched research on CO 2 Research on supercritical fracturing technology, Richard S. systematically studied CO 2 Pros and Cons of Working Fluids for Shale Gas: (1) CO 2 Potential advantage of CO 2 The fracturing effect and fracture expansion are better than hydraulic fracturing. Under constant pressure test conditions, CO 2 Adsorption is better than CH 4 , which is convenient for gas extraction and also plays a role in fixing CO 2 (2) possible disadvantages, including handling a large amount of SC-CO 2 Associated costs and safety concerns: CO 2 and CH 4 Separation of mixed gases, transportation costs, pressure safety and other issues

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.

However, the preparation process of polymer thickeners is relatively complicated, and the catalyst is expensive. For example, using acrylates and siloxane compounds as monomers for hydrosilylation reaction to prepare acrylate siloxane carbon dioxide thickeners requires the use of Chloroplatinic acid is used as a hydrosilylation catalyst. Although this type of polymer thickener has good solubility, its thickening effect needs to be improved, especially its high cost affects the application of fracturing stimulation in oil fields to a certain extent.

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