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Lithology identification method of cuttings under the condition of pdc bit matched with lithology feature library

A lithology recognition and feature library technology, applied in character and pattern recognition, computer parts, instruments, etc., can solve the problem of low accuracy of cuttings, improve recognition efficiency and recognition accuracy, improve recognition accuracy, and improve features The effect of expressiveness

Active Publication Date: 2022-03-15
NORTHEAST GASOLINEEUM UNIV
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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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  • Lithology identification method of cuttings under the condition of pdc bit matched with lithology feature library
  • Lithology identification method of cuttings under the condition of pdc bit matched with lithology feature library
  • Lithology identification method of cuttings under the condition of pdc bit matched with lithology feature library

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[0045] Below in conjunction with accompanying drawing, the present invention will be further described:

[0046] The method for identifying cuttings lithology under the condition of the PDC drill bit matched with the lithology feature library includes the following steps:

[0047] Step 1: Obtain the white light cuttings map and fluorescent cuttings map at a certain depth obtained under the conditions of the PDC drill bit in the Songliao Basin, such as figure 1 .

[0048] Step 2: Carry out color space transformation on the original white light image and fluorescent image respectively, from RGB color space to HSV color space, the formula is as follows:

[0049]

[0050] In the formula:

[0051] r, g, b, are the red, green, and blue channels of the RGB color space;

[0052] max and min are the maximum and minimum values ​​of r, g, and b values ​​corresponding to each pixel;

[0053] h, s, and v are the three channels of hue, saturation, and brightness in the HSV color spac...

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Abstract

What the present invention relates to is the cuttings lithology identification method under the PDC drill bit condition that lithology feature library matches, and it comprises: 1, carry out well drilling under the PDC drill bit condition, collect fine cuttings particle white light original picture and fluorescence image; The original white light image and the fluorescent image are converted from the RGB color space image to the HSV color space image; 3. The fluorescence image is segmented using the threshold segmentation formula; Segment all the cuttings particles of the entire Baiguang original map; 5. Extract the color and texture features of the cuttings particles at the corresponding position, and build a lithology feature library; 6. Calculate the lithology feature library features and the Bapian similarity of the cuttings features to be matched According to the matching results obtained by similarity distance, the area ratio of characteristic cuttings is calculated to complete the identification of cuttings lithology. The invention improves the characteristic expression ability of rock cuttings and improves the recognition accuracy of rock cuttings.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V10/26G06V10/50G06V10/56G06V10/75G06K9/62G01N21/64G01N21/84
CPCG01N21/64G01N21/84G06V10/267G06V10/507G06V10/56G06V10/751G06F18/24
Inventor 霍凤财赵小青任伟建董宏丽康朝海戴润凤李昂
Owner NORTHEAST GASOLINEEUM UNIV