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Coal Geology & Exploration

Abstract

Aiming at the problem of continuous power supply of downhole instruments and the recovery of longitudinal vibration energy of drill pipe in drilling field, a new type of energy recovery device based on positive piezoelectric effect was designed. The radial dimension parameters and piezoelectric materials were designed by field experiences and geological survey reports. The piezoelectric coupling model was established based on the numerical simulation software COMSOL Multiphysics, and the length range and the best installation position of the piezoelectric plate were obtained through forced vibration analysis. Through modal analysis and frequency response research, it is obtained that the natural frequency of the piezoelectric cantilever increases monotonically with the thickness of the piezoelectric sheet before reaching the thickness of the inflection point, and the peak voltage varies in a regional way with the thickness of the piezoelectric sheet. The generation performance is the best when the thickness of the piezoelectric sheet is 1.2-1.4 mm, and the peak voltage of the device is 15-40 V. It provides theoretical support and design reference for the application of piezoelectric energy recovery device in drilling field.

Keywords

device while drilling, piezoelectric cantilever beam, longitudinal vibration of drill pipe, energy recovery, modal analysis

DOI

10.3969/j.issn.1001-1986.2020.04.033

Reference

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