Indoor Test System for Liquid CO2 Phase Change Shock Wave Pressure with PVDF Sensors
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Release time:2020-09-15 Impact Factor:3.27 DOI number:10.3390/s20082395 Journal:sensors Key Words:PVDF sensors; test system; liquid CO2 phase change; shock wave pressure test Abstract:Liquid carbon dioxide phase change fracturing technology (LCPCFT) has been widely
used in engineering blasting due to the advantage of no flames, and no toxic and harmful gas.
However, few studies have been conducted on the acquisition of shock wave pressure and its loading
characteristics, which are key parameters in fracturing. Referring to the CO2 in-situ fracturing
technology, an indoor test system for shock wave pressure generated during LCPCFT has been
built, with a protected polyvinylidene fluoride (PVDF) piezoelectric sensor. Then three verification
experiments with different radial distances between the fracturing tube and test points were carried out
on the test system, and in each experiment, four PVDF sensors as four test points were arranged with
different axial distance from the detonating point to test the pressure distribution. The experimental
results show that when the radial distance between the fracturing tube and test points is not too large
(≤345 mm), the pressure generated during LCPCFT is approximately uniformly distributed within
the axial length of the fracturing tube, but when it is relatively large (≈895 mm), the results between
different test points are in a certain degree of dispersion. And finally, this paper uses the intraclass
correlation coefficient (ICC) and coefficient of variation (CV) of peak pressure and impulse to process
the test results to evaluate the reliability and stability of the test system. Evaluation results show that
the test results are in good consistency. The test system in this paper has good stability and high
reliability. The test system provides a useful tool for accurately obtaining the shock wave pressure,
which is helpful for further research on LCPCFT. Indexed by:Journal paper Discipline:电子科学与技术 Document Type:J Volume:20 Issue:2395 Page Number:1-15 ISSN No.:1424-8220 Translation or Not:no Date of Publication:2020-04-23 Included Journals:SCI -
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