Well-used large-displacement ultrahigh-pressure supercritical carbon dioxide booster pump and conveying method

Abstract

The invention relates to a large-displacement ultra-high pressure supercritical carbon dioxide booster pump for wells and a transportation method, belonging to the technical field of carbon dioxide transportation for wells. It includes a pump body (2), a piston (3) and a hydraulic cylinder (1). The piston (3) is slidably arranged in the pump body (2). The piston (3) is connected to the output end of the hydraulic cylinder (1). The piston (3) ) is provided with a liquid inlet valve (4), one end of the pump body (2) is connected to a liquid discharge assembly, and the other end is provided with a supercritical carbon dioxide input pipe (5); the pump body (2) is connected to a leak detection mechanism. First pressurize the gaseous carbon dioxide to a supercritical state; then use a booster pump to continue to pressurize the supercritical carbon dioxide to 10-100Mpa and inject it downhole. The invention uses the higher pressure of supercritical carbon dioxide to push the piston, saves part of the thrust of the hydraulic oil cylinder, and has a simple and safe structure, and the thrust is large, meeting the requirements of high-pressure transportation.

Description

technical field [0001] The utility model relates to a large-displacement superhigh-pressure supercritical carbon dioxide booster pump for wells and a transportation method thereof, belonging to the technical field of carbon dioxide transportation for wells. Background technique [0002] Liquid carbon dioxide is widely used in various fields, but the storage and transportation of liquid carbon dioxide is an important reason restricting its application. Carbon dioxide is obtained by recycling and liquefying carbon dioxide generated in the production process in chemical enterprises, and the application sites are all in In remote areas such as oil wells, tankers were used to transport in the past, and the transportation cost was very high. The use of pipelines to transport carbon dioxide has become an ideal choice. The ideal state is to pressurize carbon dioxide to a supercritical state of about 7~8Mpa, and use pipelines to directly transport carbon dioxide to the application si...

AI Technical Summary

Problems solved by technology

[0002] Liquid carbon dioxide is widely used in various fields, but the storage and transportation of liquid carbon dioxide is an important reason restricting its application. Carbon dioxide is obtained by recycling and liquefying carbon dioxide generated in the production process in chemical enterprises, and the application sites are all in In remote areas such as oil wells, tankers were used to transport in the past, and the transportation cost was very high

The use of pipelines to transport carbon dioxide has become an ideal choice. The ideal state is to pressurize carbon dioxide to a supercritical state of about 7~8Mpa, and use pipelines to directly transport carbon dioxide to the application site. Of course, this is also what the inventor discovered through research and development. , is not a commonly used method in this field. At present, there is no suitable equipment at home and abroad to pressurize the carbon dioxide under the supercritical state. Generally, the plunger pump and piston pump of the crankshaft and connecting rod are prone to fugitive leakage due to high speed, so it is not suitable It is used to pressurize the medium with high pressure and containing dangerous gas (hydrogen sulfide, etc.) and then transport it. Although the diaphragm pump can avoid leakage and pressurize, the service life of the diaphragm pump is too short and can only be used for about 15 days. If it cannot meet the requirements of use, it can also be boosted by a compressor, but supercritical carbon dioxide is easy to liquefy with temperature changes, and the linear speed of the compressor is generally above 2m / s. The liquefied carbon dioxide is easily broken down if it is boosted and transported by a compressor Compressor, very dangerous, causing equipment damage

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