Simulated CO2 dry fracturing working medium mixed transportation experimental device and method

Abstract

The invention relates to a CO2 dry fracturing technology, and discloses a simulated CO2 dry fracturing working medium mixed transportation experimental device and method. A liquid CO2 storage tank, a liquid adding pump, a liquid gas separator, a boosting pump, a closed sand tank, a recovery tank, a gasification pump and a gasifier of the experimental device are connected through pipelines in sequence. A PLC, the liquid CO2 storage tank, the closed sand tank and the recovery tank are connected with a temperature sensor, the liquid gas separator and the closed sand tank are connected with a density sensor, and a booster pump is connected with a pressure sensor and a flow sensor. The experimental method comprises the steps that liquid CO2 and a proppant are injected into the liquid CO2 storage tank and pressurized and vaporized, the experimental device is controlled through the PLC to measure the liquid CO2, pressure before and after pressurization, temperatures, density and speed parameters. The simulated CO2 dry fracturing working medium mixed transportation experimental device and method can simulate the CO2 dry fracturing mixed transportation process, the operation is safe and reliable, and technical problems such as equipment and function setting of CO2 dry fracturing are solved.

Description

technical field [0001] The present invention relates to CO 2 Dry fracturing technology field. Background technique [0002] At present, the most commonly used reservoir stimulation technology at home and abroad is hydraulic fracturing technology, which uses water-based fracturing fluid to stimulate reservoirs. However, the water-based fracturing fluid system has disadvantages such as a large waste of water resources, damage to the reservoir by clay swelling and fracturing fluid residues, groundwater pollution caused by incomplete flowback, and high cost of sewage treatment. In the early 1980s, in order to overcome many problems in the fracturing construction process of water-based fracturing fluid, and also to meet the needs of special geological structure fracturing technology, foreign countries successively proposed the use of CO 2 The waterless fracturing technology as the base fluid, that is, CO 2 Dry fracturing technology. Dry fracturing has achieved success in Nort...

AI Technical Summary

Problems solved by technology

Dry fracturing has achieved success in North America, and pilot tests and preliminary applications have also begun in China, but the equipment required for dry fracturing needs to be improved, and there is no perfect experimental platform and testing for this type of product at present methods, and there are obviously greater technical and safety risks in conducting experiments directly at the site of use

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