Experimental apparatus and method for constant-pressure specific heat measurement of supercritical carbon dioxide

Abstract

The invention relates to an experimental apparatus and a method for constant-pressure specific heat measurement of supercritical carbon dioxide. The experiment apparatus for the constant-pressure specific heat measurement of supercritical carbon dioxide comprises a supercritical carbon dioxide circulating system and an injection water cycling system, wherein the supercritical carbon dioxide circulating system comprises a measurement pipeline section inner tube; the injection water cycling system comprises a measurement pipeline section outer tube; water flows between the measurement pipeline section outer tube and the measurement pipeline section inner tube; the supercritical carbon dioxide circulating system provides a closed circulation loop at a high temperature and a high pressure for carbon dioxide; and the injection water cycling system realizes heat exchange of supercritical carbon dioxide in the measurement pipeline section inner tube. The experimental apparatus and method can realize the constant-pressure specific heat measurement of supercritical carbon dioxide in relatively large pressure and temperature ranges; and the constant-pressure specific heat of supercritical carbon dioxide at different temperatures and pressures can be obtained. The apparatus is simple; operations are convenient and feasibility is high. A measurement method is scientific and can realize relatively high precision parameter measurement.

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 specific heat of supercritical carbon dioxide at constant pressure. Background technique [0002] With the rapid increase in the demand for oil and gas energy in the country's economic development and the implementation of the new oil and gas energy strategy, the field of oil and gas exploration and development continues to expand. Unconventional natural gas resources such as fault blocks, low permeability, heavy oil reservoirs, old oil fields with pressure depletion, tight gas, shale gas and coalbed methane. Unconventional natural gas reservoirs are generally characterized by low porosity, low permeability, and low pore throat radius. The resistance to gas flow is much greater than that of conventional oil and gas reservoirs, and the physical properties will become worse with the incr...

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Problems solved by technology

Due to the fact that the measurement of the specific heat of supercritical carbon dioxide at constant pressure is difficult to achieve high temperature and high pressure experimental conditions, most experts and scholars use numerical simulation analysis as the main method, and the accuracy of the calculation results needs to be verified by experiments.

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