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

Abstract

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. The measuring devices include: supercritical carbon dioxide pressurization system, viscosifier injection mixing system and supercritical carbon dioxide fracturing fluid circulation system; the critical carbon dioxide fracturing fluid circulation system provides supercritical carbon dioxide fracturing fluid with a closed circulation loop under high temperature and high pressure, The supercritical carbon dioxide pressurization system provides the required experimental pressure for carbon dioxide, and the viscosifier is injected into the mixing system to pump the viscosifier into the high-temperature and high-pressure supercritical carbon dioxide pipeline. The invention can realize the measurement of the rheological parameters of the supercritical carbon dioxide fracturing fluid in a relatively large pressure and temperature range, and can obtain the constitutive relationship of the rheological properties of the supercritical carbon dioxide fracturing fluid under different temperature and pressure conditions; the device is simple to operate and the method It is easy to implement and has high feasibility; the measurement method is scientific and can achieve 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 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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