Visual CO2 anhydrous fracturing fluid rheological property test system and test method

Abstract

The invention discloses a visual CO2 anhydrous fracturing fluid rheological property test system and test method. The system comprises a CO2 gas cylinder, a piston container and a measuring cup; an outlet of the CO2 gas cylinder is connected with an upper inlet of the piston container, and an upper outlet of the piston container is connected with an inlet of the measuring cup; and a pressure device is further arranged at the bottom of the piston container. The visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention has a compact overall structure and simple operation, can complete the measurement work of the rheological properties of CO2 anhydrous fracturing fluid, and can directly measure rheological parameters of carbon dioxide anhydrous fracturing fluid by an experiment; and by setting different temperature and pressure conditions, and adding different types of thickeners with different concentrations, the visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention measures the rheological properties of carbon dioxide anhydrous fracturing fluid within a relatively large range of temperature and pressure conditions. At the same time, the visual CO2 anhydrous fracturing fluid rheological property test system disclosed by the invention can accurately control the dosages of the thickener and carbon dioxide, and can observe the mixing situation of the two ingredients in a rotary rheometer in real time, and evaluate the solubility of the thickener in CO2 and the rheological properties of the CO2 anhydrous fracturing fluid by experiments.

Description

technical field [0001] The invention belongs to the field of rheological testing of fracturing fluids, in particular to a visual CO 2 Anhydrous fracturing fluid rheological testing system and testing method. Background technique [0002] Shale oil and gas is a new type of unconventional resource with huge reserves and development potential. Shale oil and gas reservoirs are generally relatively tight and have poor permeability, making it difficult to replenish energy. Most shale oil and gas are exploited through depletion, but this method has a rapid decline in energy and a low recovery rate. Therefore, it is necessary to find ways to replenish formation energy and increase displacement efficiency In order to increase the recovery rate. CO 2 Fracturing can play a role in improving recovery in two aspects of fracturing and supplementing formation energy. Pure CO 2 With low viscosity, it is easy to enter micro-fractures during fracturing, and it is easy to form complex fra...

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Problems solved by technology

[0004] Some of the existing experimental equipment and experimental methods in this regard require complex calculations, and rheological parameters cannot be obtained directly through experiments. The measurement error is relatively large, and the ratio and addition of the tackifier to carbon dioxide are not accurate enough

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