System and method for testing rheological properties of carbon dioxide anhydrous fracturing fluid

Abstract

The invention provides a system and a method for testing the rheological properties of a carbon dioxide anhydrous fracturing fluid. The system comprises a first gas cylinder and a second gas cylinder; the first gas cylinder and the second gas cylinder are connected with the inlet of a gas purifier by use of a first valve and a second valve, respectively; the outlet of the gas purifier is orderly connected with a volumetric flowmeter, a refrigerating system and a liquid CO2 storage tank, wherein a third valve is connected between the refrigerating system and the liquid CO2 storage tank; the outlet of the liquid CO2 storage tank is connected with a fourth valve, a first pressure gauge and a fifth valve simultaneously; the outlet of the fifth valve is orderly connected with a CO2 pump, a one-way valve and a high-pressure liquid storage tank, and then connected with a rheometer measurement unit by use of a pressure regulating valve and a mass flowmeter; a second pressure gauge and a thermometer are mounted on the rheometer measurement unit; meanwhile, a sixth valve and a vacuum pump are connected to the outlet of the rheometer measurement unit; the invention also discloses a testing method of the system; the system is especially used for testing the rheological properties of the carbon dioxide anhydrous fracturing fluids different in additive ratio at different temperatures and under different pressures.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide anhydrous fracturing, in particular to a rheological testing system and testing method of anhydrous carbon dioxide fracturing fluid. Background technique [0002] In recent years, carbon dioxide anhydrous fracturing technology is becoming a research hotspot. CO 2 Waterless fracturing technology mainly uses CO 2 Anhydrous fracturing fluid (mainly composed of liquid CO 2 Formed by mixing with a very small amount of chemical additives) instead of traditional water-based fracturing fluids, it has the characteristics of "waterless fracturing", which can obviously eliminate the water sensitivity and water lock damage of conventional fracturing fluids to reservoirs, improve the effect of fracturing reconstruction, and fracturing The cracking fluid has no residue, which can effectively protect the reservoir and save a lot of water resources. [0003] However, the existing commonly used instrume...

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Problems solved by technology

[0005] In order to overcome the equipment and instrument supporting problems existing in the above-mentioned prior art, the object of the present invention is to provide a carbon dioxide anhydrous fracturing fluid rheological testing system and testing method, which is specially used for testing carbon dioxide anhydrous fracturing fluid with different additive ratios Rheological properties at different temperatures and different pressures

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