Recognition of Well-logging Curve Based on Morphological-included Angle Chain of Changeable Length
Shang Fuhu · Computer and Digital Engineering · 2014
In the isotope tracer injection profile logging,the magnetic positioning logging curves can directly reflect the type of downhole tools.To solve this identification problem that the overall shapes of the curves are similar,but other features of the curve,e.g.,the local curvature,amplitude,number of peaks are not the same,a novel approach,curve morphological combined with included angle chain of changeable length,is presented for curve encoding and representation.The curve will be represented by straight lines,and described by features about length of the polyline and the angle between adjacent polyline.The genetic algorithm is used to get the optimal weight,then polyline features and angle features are weighted based on that data.Finally,the feature-weighted K-nearest neighbors are used to classify the downhole tools.Experimental results show that this method can effectively be used to identify downhole tools.