Rock debris lithology identification method under condition of PDC drill bit matched with lithology feature library

Abstract

The invention relates to a rock debris lithology identification method under the condition of a PDC drill bit matched with a lithology feature library, and the method comprises the steps: 1, carryingout the drilling under the condition of the PDC drill bit, and collecting a fine rock debris particle white light original image and a fluorescent image; 2, converting the white light original image and the fluorescence image into an HSV color space image from an RGB color space image; 3, segmenting the fluorescence image by adopting a threshold segmentation formula; 4, segmenting the white lightoriginal image through an image segmentation algorithm based on watershed and neighbor region combination, and segmenting all rock debris particles of the whole white light original image; 5, extracting color and texture features of rock debris particles at corresponding positions, and constructing a lithology feature library; and 6, calculating a Bhattacharyya similarity distance between the lithologic feature library features and the rock debris features to be matched, and calculating an area ratio of the feature rock debris according to a matching result obtained by the similarity distance,thereby completing identification of the lithologic character of the rock debris. According to the method, the feature expression capability of the rock debris is improved, and the identification precision of the rock debris is improved.

Description

technical field [0001] The invention relates to a method for identifying the lithology of cuttings under the condition of a PDC drill bit, in particular to a method for identifying the lithology of cuttings under the condition of a PDC drill bit with matching lithological characteristics of Kuba's distance. Background technique [0002] The identification of cuttings lithology is one of the important ways to distinguish downhole formation lithology and oil and gas. At present, due to the advantages of high well scale, high speed and low drilling cost of PDC bit, it has been widely developed and applied in the field of exploration. However, the cuttings obtained by drilling with PDC bits are very small and small, which will reduce the accuracy of manual identification of cuttings and affect the identification of cuttings lithology. [0003] With the rapid development of today's technology, image recognition algorithms emerge in endlessly, but there is no very effective metho...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a cuttings lithology identification method under the PDC drill bit condition matched with the lithology feature library, and the cuttings lithology identification method under the PDC bit condition matched with the lithology feature library is used to solve the problem of identifying PDC in the prior art The problem of low accuracy of cuttings obtained by drill bit drilling

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