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

Abstract

The present invention relates to the field of petroleum fracturing, and provides an apparatus for measuring the rheological property of a supercritical carbon dioxide fracturing fluid. The apparatus comprises a supercritical carbon dioxide pressurization system, a tackifier injection mixing system and a supercritical carbon dioxide fracturing fluid circulation circuit, wherein the supercritical carbon dioxide pressurization system can input carbon dioxide into the supercritical carbon dioxide fracturing fluid circulation circuit, and the tackifier injection mixing system can input a tackifier into the supercritical carbon dioxide fracturing fluid circulation circuit. The present invention further provides a method for measuring the rheological property of a supercritical carbon dioxide fracturing fluid. With the apparatus and the method of the present invention, the constitutive relations of the rheological property of the supercritical carbon dioxide under different temperatures and different pressures can be obtained.

Description

technical field [0001] The invention relates to the field of petroleum fracturing, in particular to a method for measuring supercritical CO 2 Apparatus and method for fracturing fluid rheology. 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 exploitation technology not of commercial exploitation value, which determines that unconventional oil and gas resources need to adopt fracturing technology t...

AI Technical Summary

Problems solved by technology

The high-pressure capillary viscometer can measure the viscosity of the fluid under a certain pressure, but because there is no mixing device, the viscosifier and supercritical carbon dioxide cannot be fully mixed and dissolved, and the pipeline is easy to be blocked, and the measurement effect is not good

The MARS rheometer system of German HAAKE company can realize rheological measurement under certain pressure and temperature. However, due to the very low viscosity of supercritical carbon dioxide, only 0.02mPa s, it generally does not exceed 10mPa s after thickening. MARS system Measurement accuracy is very poor in this range area

Images