Device and method for measuring rheological property of supercritical carbon dioxide fracturing fluid

Abstract

The invention belongs to the technical field of unconventional oil and gas production, and particularly relates to a device and a method for measuring the rheological property of a supercritical carbon dioxide fracturing fluid. The measurement device comprises a supercritical carbon dioxide pressurization system, a thickening agent injecting and mixing system and a supercritical carbon dioxide fracturing fluid circulating system, wherein the supercritical carbon dioxide fracturing fluid circulating system provides power required by closed circulation of the supercritical carbon dioxide fracturing fluid, and adopts a circulation loop which is closed at the high temperature and high pressure; the supercritical carbon dioxide pressurization system provides testing pressure required by carbon dioxide; and the thickening agent injecting and mixing system pumps a thickening agent into a high-temperature and high-pressure supercritical carbon dioxide pipeline. According to the device and the method for measuring the rheological property of the supercritical carbon dioxide fracturing fluid, the rheological parameter of the supercritical carbon dioxide fracturing fluid in larger pressure and temperature ranges can be measured, and the constitutive relation of the rheological property of the supercritical carbon dioxide fracturing fluid at different temperature and pressure can be obtained; the device is simple to operate, the method is easy to implement, and the feasibility is high; and measurement device is scientific, and higher-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 a device and method for measuring the rheological properties of supercritical carbon dioxide fracturing fluid. Background technique [0002] Unconventional natural gas resources include coalbed methane, shale gas, tight sandstone gas, and water-soluble gas. At present, unconventional oil and gas resources have played an important role in the global energy structure. The reservoir physical properties of unconventional oil and gas resources are generally poor, with physical characteristics such as low porosity, low permeability, and low pore throat radius. The flow resistance of oil and gas is much greater than that of conventional oil and gas reservoirs. The deterioration of the physical properties of the reservoir makes the conventional mining technology not of commercial value, which determines that unconventional oil and gas resources...

AI Technical Summary

Problems solved by technology

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

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