Mr. Zhennan Wang Profile

Zhennan Wang

at Ocean University of China

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Proceedings Article | 23 August 2011 Paper

A new approach for cuttings identification using laser induced breakdown spectroscopy

Zhen-nan Wang, Ye Tian, Ying Li, Rong-er Zheng

Proceedings Volume 8192, 81923Z (2011) https://doi.org/10.1117/12.901044

KEYWORDS: Laser induced breakdown spectroscopy, Laser cutting, Principal component analysis, Chemometrics, Plasma, Particles, Diamond, Multi-element lenses, Nd:YAG lasers, Optoelectronics

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In the process of oil exploration and development, it becomes difficult to identify the lithology of cuttings due to the small size of cutting particles produced by extensively used Polycrystalline Diamond Compact (PDC) drill bit. Laser Induced Breakdown Spectroscopy (LIBS) is an appealing technique compared with many other conventional analysis methods due to its simple set-up, on-line, real time, stand off and multi-element analytical capabilities. In this paper, a newly developed approach for cuttings identification using laser-induced breakdown spectroscopy was introduced. Principal component analysis (PCA) and partial least squares (PLS) were applied to analyze LIBS spectra of three drill cuttings to perform cuttings identification. With the purpose of reducing workload and improving predictive accuracy, 23 characteristic spectra ranges were extracted as "fingerprints" from each integrated LIBS spectrum. Leave-one-out cross-validation method (LOO-CV) was used to evaluate the predictive capability of this approach. All the LIBS spectra were identified correctly under a lax criterion. The obtained preliminary results demonstrated the potential feasibility of cutting identification using LIBS in combination with chemometric methods.

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