Image crack real-time extraction method suitable for ultrasonic imaging logging

A technology of ultrasonic imaging and extraction methods, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of affecting the detection results, residual non-crack information, poor recognition, etc. The effect of excellent search

Active Publication Date: 2021-03-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0005] There are many fracture identification methods based on ultrasonic imaging logging, and some use mathematical models to fit the scattered points satisfying the sinusoidal shape. However, in actual drilling, the wellbore is damaged and the fracture shape is not necessarily a standard sinusoidal, resulting in poor identification; Some use the maximum entropy threshold segmentation algorithm to separate the pixels corresponding to cracks from the image, but often some non-crack information remains, which affects the detection results

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  • Image crack real-time extraction method suitable for ultrasonic imaging logging
  • Image crack real-time extraction method suitable for ultrasonic imaging logging
  • Image crack real-time extraction method suitable for ultrasonic imaging logging

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[0052] figure 2 It is an overall block diagram of the image fracture real-time extraction method applicable to ultrasonic imaging logging in the present invention.

[0053] In this example, if figure 2 As shown, a method for real-time extraction of image fractures suitable for ultrasonic imaging logging of the present invention comprises the following steps:

[0054] S1, image segmentation

[0055] The FPGA internal architecture of the ultrasonic imaging logging tool is as follows: image 3 As shown, the receiving command is mainly used to process the commands sent by the host computer and PIC, the transmitting module is used to control the ultrasonic transmitting channel, the acquisition and calculation module is used to store and process ADC data, and the EDIB sending module is used to pass M2, M5, M7 sends the processed data to the host computer for imaging, and coordinates the work between various modules in the FPGA through various control signals.

[0056] Such as ...

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Abstract

The invention discloses an image crack real-time extraction method suitable for ultrasonic imaging logging, and the method comprises the steps: carrying out the preliminary segmentation of an originalimage according to an Otus segmentation algorithm, and extracting effective crack information so as to build a search space; referring to the crack expansion form, determining a crack reference position through a voting accumulation mechanism, and properly cutting an area where the crack is located according to the reference position; cutting the cut image along the longitudinal direction to obtain each subarea with partial crack information, and carrying out crack search and extraction on each subarea in parallel by using an ant colony algorithm; and finally, splicing the subareas of the searched crack path to obtain a complete crack.

Description

technical field [0001] The invention belongs to the technical field of well logging, and more specifically relates to a method for real-time extraction of image fractures suitable for ultrasonic imaging well logging. Background technique [0002] In the field of petroleum logging, formation fractures are discontinuous sections that are widely distributed in different lithologies and gradually formed through different diagenesis or structural deformation. The presence or absence of fractures is usually a key indicator of the recoverability of oil and gas reservoirs in tight formations. Peripheral imaging logging technology is one of the mainstream methods for obtaining formation information. Peripheral imaging logging can reflect the status of oil wells with intuitive wellbore images, and can clearly see the development of cracks and holes on the wellbore, which is an important means of evaluating oil wells. [0003] The main logging methods used in the field of wellbore im...

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Application Information

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IPC IPC(8): G06T7/00G06T7/11G06T7/136G06T7/194G06N3/00E21B47/00
CPCG06T7/0004G06T7/11G06T7/136G06T7/194G06N3/006E21B47/00G06T2207/10132G06T2207/30132Y02A90/30
Inventor张伟李焱骏师奕兵吴桐罗欣怡李志鹏
OwnerUNIV OF ELECTRONIC SCI & TECH OF CHINA