Liquid CO2 phase-change jet flow impact power experiment method under different pressures and temperatures

Abstract

The invention discloses a liquid CO2 phase-change jet flow impact power experiment method under different pressures and temperatures. The method comprises the following steps: S1, preparing a liquid CO2 phase-change jet flow impact power experiment system; S2, formulating an experiment scheme; S3, preparing an experiment; S4, preparing high-pressure liquid carbon dioxide; S5, forming liquid CO2 jet flow, and testing jet flow form, speed and pressure data; and S6, adjusting the CO2 initial pressure and the temperature of a constant-temperature and constant-humidity box body, repeating the step4 and 5, conducting liquid CO2 phase-change jet flow form, speed and pressure change parameter experiments under different initial pressure and different temperature conditions, and analyzing the change relation of the jet flow form, the jet flow speed and the fluid pressure along with time, the CO2 initial pressure and the constant-temperature and constant-humidity box body. A dynamic and staticload loading device and a coal rock sample are not needed, the method is used for researching the jet flow form, speed and pressure change rule influence in the carbon dioxide phase-change jet flow process under different initial pressure and temperature conditions, and the development of the technology basic theory and the application technology is promoted.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide phase change fracturing of coal and rock mass, and in particular relates to a liquid CO2 under different initial pressures and temperatures 2 Experimental method of phase change jet impingement dynamics. Background technique [0002] Liquid carbon dioxide phase change fracturing technology, as an effective coal-rock crushing technology, is widely used in rock mass crushing and low-permeability coal-rock reservoir fracturing and permeability enhancement. The principle of this technology is: pressurize and liquefy carbon dioxide and store it in a sealed container, adopt the form of instantaneous heating or instantaneous pressure relief, generate a high-pressure gas jet to act on the target coal and rock mass, and cause structural damage to the coal and rock mass under the action of high-pressure gas. At present, this technology has made great progress in field application and technical equip...

AI Technical Summary

Problems solved by technology

At present, this technology has made great progress in field application and technical equipment, but for the liquid carbon dioxide phase change jet simulation experiment, it still needs to use dynamic and static load loading devices and coal rock samples, and for the carbon dioxide phase change jet process The research on impact dynamic parameters, influencing factors and their influencing laws such as fluid shape, jet pressure, and striking target pressure is still in its infancy, which has affected the development of the basic theory and application technology of this technology to a certain extent.

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