Experimental device and method for measuring surface coefficient of heat transfer of supercritical carbon dioxide

Abstract

The invention relates to an experimental device and method for measuring the surface coefficient of heat transfer of supercritical carbon dioxide. The experimental device comprises a supercritical carbon dioxide circulating system and an injected water circulating system, wherein the supercritical carbon dioxide circulating system is provided with a measuring pipeline segment inner pipe, the injected water circulating system is provided with a measuring pipeline segment outer pipe, and the measuring pipeline segment inner pipe is embedded in the measuring pipeline segment outer pipe; water flows in an annulus between the measuring pipeline segment outer pipe and the measuring pipeline segment inner pipe; the supercritical carbon dioxide circulating system provides a circulating loop closed at high temperature and high pressure for carbon dioxide; the heat exchange of supercritical carbon dioxide in the measuring pipeline segment inner pipe can be realized through the injected water circulating system. The measurement on the surface coefficient of heat transfer of supercritical carbon dioxide within larger pressure and temperature range can be realized so as to obtain the surface coefficient of heat transfer of supercritical carbon dioxide under the conditions of different temperatures and pressures; the experimental device and method are simple in equipment, convenient to operate, and high in feasibility; the measurement method is scientific, and high-precision parameter measurement can be realized.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas exploitation, and in particular relates to an experimental device and method for measuring the surface heat transfer coefficient of supercritical carbon dioxide. Background technique [0002] With the rapid development of my country's economy, the demand for oil and natural gas energy is increasing day by day, and now our country will not have too many opportunities to rediscover large oil fields such as Daqing, Shengli, and Liaohe. Among the recently discovered oil and gas resources, natural gas resources are very rich. Especially unconventional natural gas, including shale gas, coal bed methane and tight natural gas. Compared with conventional oil and gas reservoirs, unconventional oil and gas resources have extremely low permeability and are difficult to develop. Drilling and completion technologies to protect oil and gas layers can effectively improve the ultimate recovery o...

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Problems solved by technology

At present, due to the influence of temperature and pressure, the heat transfer law of supercritical carbon dioxide is quite complicated, and the experimental data obtained are few, and there is no systematic explanation for the heat transfer mechanism, so it has become a difficulty in the field of supercritical fluid heat transfer.

The early studies on supercritical carbon dioxide surface heat transfer coefficient (or convective heat transfer coefficient) were mainly used in carbon dioxide refrigeration technology, but few experimental studies were conducted on the flow law and heat transfer performance of supercritical carbon dioxide in pipelines, and only some numerical values ​​were carried out. simulation

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