Formation method and device of self-excited oscillation supercritical carbon dioxide jet

Abstract

The invention belongs to the technical field of supercritical carbon dioxide jet, and discloses a formation method and device of self-excited oscillation supercritical carbon dioxide jet. The device includes a carbon dioxide gas supply system, a cooling liquefaction system, a pressurization system, a temperature rise system, an experimental system, a filtering system, a recovery system and a control system, and particularly includes a high-pressure carbon dioxide cylinder, a cold bath box and an air-cooled compressor, a liquid carbon dioxide storage tank, a high-pressure plunger pump, a hot bath box, a heating buffer tank, a circulating pump, an experimental kettle, at least two desambers, purifiers and control cabinets. According to the device, supercritical carbon dioxide is prepared byusing the systems, an improved self-excited oscillation nozzle is used for producing the self-excited oscillation supercritical carbon dioxide jet, impact force of the self-excited oscillation jet is1.5-2.5 times of stagnation pressure of continuous jet, the impact damage effect of the jet can be enhanced, and the self-excited oscillation supercritical carbon dioxide jet can obtain the better rock breaking and erosion effect and has broad prospects in unconventional oil and gas development.

Description

technical field [0001] The invention belongs to the technical field of supercritical carbon dioxide jets, and in particular relates to a self-excited oscillation supercritical carbon dioxide jet device and a method for forming self-excited oscillation supercritical carbon dioxide jets by using the device. Background technique [0002] Studies have shown that when the temperature and pressure of carbon dioxide reach 304.1K and 7.38 MPa respectively but do not exceed its fusion line, it will reach a supercritical state. The properties of supercritical carbon dioxide are between gas and liquid. It has low viscosity and strong diffusion ability close to gas, high density and strong solubility close to liquid. Supercritical carbon dioxide technology is currently mainly used in extraction, instrument cleaning, printing and dyeing industry, environmental science, polymer materials, oil and gas development and other fields. Especially in the field of unconventional oil and gas deve...

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Problems solved by technology

At present, in actual production applications, high-pressure water jets and self-oscillating water jets are often used to assist rock-breaking operations, which have the disadvantages of high water consumption and general rock-breaking efficiency. In addition, self-oscillating nozzles Most of the research is based on the Helmholtz nozzle and organ pipe. For these two nozzles, they are currently used based on incompressible fluids, while supercritical carbon dioxide is a compressible fluid, and it still needs to be based on supercritical carbon dioxide. properties to design nozzles

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