CN111827974A - Core digital acquisition system and method - Google Patents
Core digital acquisition system and method Download PDFInfo
- Publication number
- CN111827974A CN111827974A CN202010964871.0A CN202010964871A CN111827974A CN 111827974 A CN111827974 A CN 111827974A CN 202010964871 A CN202010964871 A CN 202010964871A CN 111827974 A CN111827974 A CN 111827974A
- Authority
- CN
- China
- Prior art keywords
- core
- industrial personal
- personal computer
- digital
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000005286 illumination Methods 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 20
- 239000011435 rock Substances 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 abstract description 6
- 238000003709 image segmentation Methods 0.000 abstract description 4
- 238000003384 imaging method Methods 0.000 abstract description 4
- 239000011162 core material Substances 0.000 description 48
- 238000010586 diagram Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 241000239290 Araneae Species 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/14—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4023—Scaling of whole images or parts thereof, e.g. expanding or contracting based on decimating pixels or lines of pixels; based on inserting pixels or lines of pixels
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Data Mining & Analysis (AREA)
- Pure & Applied Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mathematical Optimization (AREA)
- Mining & Mineral Resources (AREA)
- Computing Systems (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Geochemistry & Mineralogy (AREA)
- Algebra (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a system and a method for digitally acquiring a rock core, belonging to the technical field of geological exploration. According to the method, through a drilling full-well wall imaging technology, after drilling is finished, a drilling acquisition probe is put down into a hole after hole cleaning is carried out, a complete digital image sequence of 360 degrees of the inner wall of the drilling hole is directly acquired by using a depth sensor in a matched mode, and the digital image processing technology is utilized to carry out digital processing, expansion, image segmentation, edge tracking, splicing and 3D restoration on the image sequence acquired underground, so that a complete core digital image is obtained. Through the design, the problem that the core cannot be adopted due to rock stratum crushing and overlarge aperture is solved, and the core digital acquisition is realized.
Description
Technical Field
The invention belongs to the technical field of geological exploration, and particularly relates to a core digital acquisition system and method.
Background
In engineering works such as engineering geophysical exploration, hydrogeology, mineral exploration and the like, although a plurality of nondestructive detection methods such as electrical methods, magnetic methods, sound wave detection and the like are available, a rock core is usually adopted through drilling to calibrate and correct the rock core so as to obtain accurate underground geologic body data. Even in many engineering works, core drilling is a major exploration tool. However, the transportation and storage of the core real object are time-consuming and labor-consuming works and are not easy to trace, and although some digital technologies are used, the core real object is mainly limited to be photographed and stored after being taken, so that the complete condition of the underground geologic body is difficult to reproduce; and under the conditions of complex geological conditions, broken rock stratums or overlarge pore diameters, the drill rig cannot adopt the rock core in the drilling process, so that engineering personnel cannot accurately acquire information such as the lithology, the erosion degree, the fracture development condition, the structure development condition and the like of the stratum, and inconvenience is brought to subsequent work of engineering.
Disclosure of Invention
Aiming at the defects in the prior art, the core digital acquisition system and the core digital acquisition method provided by the invention solve the problems that the core cannot be adopted due to rock stratum crushing and overlarge pore diameter and the core material object is difficult to transport and store.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a core digital acquisition system which comprises a wellhead pulley, a depth sensor, a tripod and a winch, an industrial personal computer unit, an underground probe unit and a computer image processing unit, wherein the depth sensor, the tripod and the winch are respectively connected with the wellhead pulley; the winch is positioned on the tripod, and the wellhead pulley is positioned on the tripod and above the winch;
the depth sensor is used for acquiring the rotation angle of the wellhead pulley;
the underground probe unit is used for shooting a 360-degree digital image sequence of the inner wall of the drill hole according to the rotation angle;
the industrial personal computer unit is used for sending the received digital image sequence to the computer image processing unit;
and the computer image processing unit is used for processing the digital image sequence by utilizing an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image and finish the data acquisition of the core.
Furthermore, the industrial personal computer unit comprises a controller, an industrial personal computer host connected with the controller and a display connected with the industrial personal computer host;
the video output end of the controller is connected with the video input end of the industrial personal computer host, and the RS-232 interface of the controller is connected with the RS-232 interface of the industrial personal computer host; the display is connected with the industrial personal computer host through a VGA interface.
Still further, the computer image processing unit comprises a computer, an image acquisition card and a recorder, wherein the computer is connected with the controller through an RS-232 interface.
Still further, the coding input end of the controller is connected with the output end of the depth sensor.
Still further, the power supply and the signal of the downhole probe unit are both connected with the controller through a transmission cable, wherein the transmission cable is of a 12-core structure.
Still further, the underground probe unit comprises a probe cylinder, a camera and an LED illumination light source which are positioned in the probe cylinder and connected with the transmission cable, a conical reflector positioned in a shooting area and an embedded north arrow positioned above the conical reflector; the transmission cable supplies power to the camera and the LED illumination light source.
Based on the system, the invention also provides a core digital acquisition method, which comprises the following steps:
s1, placing the borehole downhole probe into the hole, and acquiring the rotation angle of the wellhead pulley by using the depth sensor;
s2, shooting a 360-degree digital image sequence of the inner wall of the drilled hole through a conical reflector by using a camera according to the rotation angle;
and S3, processing the digital image sequence by using an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image, thereby completing the data acquisition of the core.
Further, the expression for processing the digital image sequence by using the interpolation weighting method in step S3 is as follows:
wherein,
representing a pixel to be solved
I represents the integer part of the abscissa x of the pixel point to be solved, u represents the fractional part of x, j represents the integer part of the ordinate y of the pixel point to be solved, v represents the fractional part of y, a represents the weight vector on the abscissa, B represents the gray value matrix of 16 adjacent pixel points, C represents the weight vector on the ordinate, and S is the value of the weight.
The invention has the beneficial effects that:
(1) the invention aims to directly acquire a complete 360-degree digital image sequence of the inner wall of a drilled hole by using a depth sensor in a matched manner by using a drilling full borehole wall imaging technology, cleaning the drilled hole after drilling the drilled hole, and putting a drilling acquisition probe into the drilled hole. By utilizing a digital image processing technology, the image sequence acquired underground is subjected to digital processing, expansion, image segmentation, edge tracking, splicing and 3D restoration, so that a complete core digital image is obtained. Through the design, the problem that the core cannot be adopted due to rock stratum crushing and overlarge aperture is solved, and the core digital acquisition is realized.
(2) The invention realizes direct acquisition in a drilling site and avoids the problem of difficult transportation and storage of the core material object.
(3) According to the invention, the conical reflector and the single high-definition digital camera are matched to collect 360-degree hole wall images, so that the collection error caused by multiple lenses or lens rotation is avoided.
(4) The invention integrates the functions of acquisition and image processing, can effectively realize the on-site viewing and acquisition quality, directly forms the 3D digital rock core on site, can directly complete the field work, can analyze and judge the geological condition without the need of experts arriving at the site, not only improves the working efficiency, but also ensures the acquisition quality.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic diagram of the system of the present embodiment.
Fig. 3 is a schematic diagram illustrating a connection between a controller and a host port of an industrial personal computer in this embodiment.
Fig. 4 is a schematic structural diagram of the downhole probe unit in this embodiment.
FIG. 5 is a schematic diagram of the cable connection between the downhole probe and the controller according to this embodiment.
Fig. 6 is a schematic diagram of the hole wall image transformation in the present embodiment.
Fig. 7 is a schematic view showing the development of the aperture wall image in this embodiment.
Fig. 8 is a schematic diagram illustrating interpolation of the aperture wall image in the present embodiment.
FIG. 9 is a flow chart of a method of the present invention.
Fig. 10 is a developed view of the pore wall actually collected in this example.
Fig. 11 is a rotated 3D core map actually acquired in this example.
Fig. 12 is a developed view of the hole wall after 3D restoration in the present embodiment.
Fig. 13 is a view of the rotational 3D core after 3D restoration in this example.
The system comprises a well head pulley, a depth sensor, a tripod 3, a winch 4, an industrial control host 5, a controller 6, a display 7, a transmission cable 8, a probe barrel 9, a camera 10, an LED illumination light source 11, a conical reflector 12 and an embedded compass 13.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
As shown in figure 1, the invention provides a core digital acquisition system, which comprises a wellhead pulley 1, a depth sensor 2, a tripod 3 and a winch 4 which are respectively connected with the wellhead pulley 1, an industrial personal computer unit connected with the depth sensor 2, and an underground probe unit and a computer image processing unit which are respectively connected with the industrial personal computer unit; the winch 4 is positioned on the tripod 3, and the wellhead pulley 1 is positioned on the tripod 3 and above the winch 4; the depth sensor 2 is used for acquiring the rotation angle of the wellhead pulley 1; the downhole probe unit is used for shooting a 360-degree digital image sequence of the inner wall of the drill hole according to the rotation angle; the industrial personal computer unit is used for sending the received digital image sequence to the computer image processing unit; and the computer image processing unit is used for processing the digital image sequence by utilizing an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image and finish the data acquisition of the core.
As shown in fig. 2 and 3, the industrial personal computer unit comprises a controller 6, an industrial personal computer host 5 connected with the controller 6, and a display 7 connected with the industrial personal computer host 5; the video output end of the controller 6 is connected with the video input end of the industrial personal computer host 5, and the RS-232 interface of the controller 6 is connected with the RS-232 interface of the industrial personal computer host 5; the display 7 is connected with the industrial personal computer host 5 through a VGA interface. The coding input of the controller 6 is connected to the output of the depth sensor 2. The computer image processing unit comprises a computer, an image acquisition card and a recorder, wherein the computer is connected with the controller 6 through an RS-232 interface.
As shown in fig. 4 and 5, the power supply and the signal of the downhole probe unit are connected to the controller 6 through a transmission cable 8, wherein the transmission cable 8 has a 12-core structure. The downhole probe unit comprises a probe barrel 9, a camera 10 and an LED illumination light source 11 which are positioned in the probe barrel 9 and connected with the transmission cable 8, and a conical reflector 12 positioned in a shooting area; wherein, the transmission cable 8 is used for supplying power for the camera 10 and the LED illumination light source 11.
In this embodiment, before the core is digitally collected, the following work needs to be confirmed:
preparation work:
(1) cleaning a camera shooting window: the camera shooting window is not clean and transparent, and the camera shooting quality is influenced. Before the well is run, please wipe the glass window clean with a soft cloth or a long fiber tissue paper to keep the window clean and transparent.
(2) Adjusting the aperture of the camera lens: in order to obtain an optimal borehole wall image, the aperture of the camera lens must be adjusted to the appropriate position.
(3) And (3) inspecting the sealing of the underground probe: the underground part of the drilling digital core acquisition system is sealed at two positions, wherein one position is a camera shooting window, and the other position is a cable sealing head. In order to prevent accumulated water in the well from entering the probe and carefully check the tightness of the probe, silicone grease is used for smearing and sealing when necessary;
system installation and connection:
(1) mounting of tripod 3 and winch 4: the spider 3 is supported above the borehole and the winch 4 is mounted on the spider 3, noting the direction of the winch brake, with the ratchet of the brake facing outwards (i.e. in the direction of the operator), so that the brake can only be applied when lifting the downhole sonde.
(2) Installing a wellhead pulley 1: install well head pulley 1 on the head plate of tripod, notice that the bolt is tight too of not screwing up, let well head pulley freely movable.
(3) Installing an underground probe: when the underground probe leaves a factory, the movement and the optical system are installed into a whole, generally, the underground probe does not need to be opened, and only the sealing head of the transmission cable is connected with the underground probe to be installed.
(4) System connection: the interfaces of the transmission cable 8 are standard interfaces, and a plug at the other end of the transmission cable is inserted into a cable socket on a panel of the industrial personal computer and is screwed tightly; inserting a data transmission cable 8 of an encoder on a wellhead pulley 1 into an encoder socket on a rear panel of a host of an industrial personal computer, wherein an interface is an RS-232 interface; connecting the video output on the rear panel of the controller with a video port (Com 1 or Com 2 of the input port of the image acquisition card) on the rear panel of the computer by using a video transmission line; the industrial personal computer 5 checks whether the power supply voltage is correct by using a 220V power supply, and plugs the power lines of the industrial personal computer.
In this embodiment, as shown in fig. 2, the industrial personal computer unit includes an industrial personal computer host 5, a controller 6, and a display, where the controller 6 includes a power supply, a focusing control, a depth sensor, and an image acquisition control. The controller 6 provides camera power, lighting power, control focusing, etc. for the downhole probe. The depth sensor 2 accurately records and displays the logging depth, and the acquisition controller receives depth information and controls image acquisition by talking with a computer image processing unit through an RS-232 interface.
In this embodiment, the computer image processing unit includes a computer, an image capture card and a recorder. The computer image processing unit collects hole wall image signals sent by the transmission cable, identifies and expands the hole wall image signals, automatically splices the hole wall image signals to form a core 3D image, displays the core 3D image through a monitor, and records the core 3D image in a computer hard disk.
In this embodiment, the computer image processing unit can also perform editing and interpretation processing on the stored image information, and can also record the drilling image information on an optical disc for storage by a recorder, and print the image into a picture by a printer.
In this embodiment, as shown in fig. 3, the controller 6 serves as a control connection center of the whole system, and inputs the coded input from the depth sensor 2 and the video signal input from the high-definition camera of the downhole probe, and the video signals are transmitted through the probe cable, and the connection cable of the downhole probe serves as both the video signal transmission cable and the power supply cable for controlling the camera and illuminating the LED lamp by the probe. The output end of the transmission cable of the downhole probe comprises two ends: firstly, data output of the depth sensor 2 is output to an RS-232 interface of the industrial personal computer host 5 through RS-232; and secondly, outputting the video signal to the industrial personal computer host 5, and storing the video signal to a hard disk by the industrial personal computer host 5.
In this embodiment, the transmission cable 8 has a 12-core structure, and the structure diagram is shown in fig. 4, one end of the transmission cable is connected with the downhole probe, and the other end of the transmission cable is connected with a cable socket on the rear panel of the controller 6; the data transmission cable of the depth sensor 2 is connected with an encoder socket on the rear panel of the controller 6; the video transmission line is connected with the video output on the back panel of the controller 6 and the video port on the back panel of the industrial personal computer, namely the input port of the image acquisition card.
In the embodiment, an RS-232 port on the rear panel of the controller 6 is connected with an RS-232 port on the rear panel of the industrial control host computer by using a serial port line, and the display 7 is connected with the industrial control host computer by a VGA line; the controller 6, the industrial personal computer host 5 and the display 7 all use 220V alternating current power supply
In this embodiment, as shown in fig. 4, the downhole probe unit includes a downhole high-definition digital camera 10, an LED illumination light source 11, a conical reflector 12, a transparent camera window, and an embedded north pointer 13, and a power supply and a signal of the downhole probe unit are connected to the ground industrial personal computer unit through a transmission cable 8. The underground probe and the controller are connected with plugs through cables, seat cores are connected and distributed as shown in figure 5, wherein the video is grounded, the public ground, the empty, the 12V camera power supply is grounded, the 14 VLED illuminating lamps are arranged from eight to 220VLED illuminating lamps, the air, the wave and 220VLED illuminating lamps are arranged from nine to ten, the ⑪ to 7V focusing motor power supply and the ⑫ to 7V focusing motor power supply are arranged in the figure.
In the embodiment, the camera 10 is adopted to capture images around the hole wall through the conical reflector 12, the image acquisition and image processing system is controlled by the computer to automatically acquire the images, the images are unfolded and spliced to form continuous images of the cylindrical section of the full-hole wall of the drill hole to be displayed in real time, and the images of the full-hole wall are continuously recorded. The computer is adopted to control and collect images, analog image recording is changed into digital image recording, the images are recorded on a hard disk or recorded on an optical disk, hole wall images are converted into images as shown in figure 6, the images projected on a conical lens by a cylindrical hole wall are collected by a high-definition digital camera to obtain annular images, and the annular images are unfolded and restored into rectangular images through interpolation.
In this embodiment, the principle of expansion and interpolation is shown in fig. 7-8, and it can be seen from fig. 7 and 8 that the hole wall is projected on the conical mirror, and the aperture is
But the radius of the top of the conical mirror is
And the bottom radius is
After being unfolded, a rectangular image is formed, and the width of the upper bottom (namely the top of the shooting area) of the rectangle is
And the width of the lower bottom (i.e., the bottom of the photographing region) is
All require interpolation to obtain the actual width of
The pixel value of (2).
In this embodiment, cubic interpolation is adopted, the value of the output pixel is a weighted average of the values of the sampled electrical pixels in a 4 × 4 neighborhood of the input image closest to the input image, and the cubic interpolation approximates a theoretically optimal interpolation function by using a polynomial
. The polynomial is as follows:
in the formula
The distance between the peripheral pixels and the far point along the x direction is used to calculate the pixel
The gray value of (2) is obtained by weighted interpolation of the gray values of 16 points around the gray value, and the calculation formula is as follows:
wherein,
representing a pixel to be solved
I represents the integer part of the abscissa x of the pixel point to be solved, u represents the fractional part of x, j represents the integer part of the ordinate y of the pixel point to be solved, v represents the fractional part of y, a represents the weight vector on the abscissa, B represents the gray value matrix of 16 adjacent pixel points, C represents the weight vector on the ordinate, and S is the value of the weight.
According to the invention, through a drilling full well wall imaging technology, after drilling, cleaning the hole through hole cleaning, placing a drilling acquisition probe in the hole, and directly acquiring a complete 360-degree digital image sequence of the inner wall of the drilling hole by using a depth sensor in a matched manner. By utilizing a digital image processing technology, the image sequence acquired underground is subjected to digital processing, expansion, image segmentation, edge tracking, splicing and 3D restoration, so that a complete core digital image is obtained. The problem that the rock core cannot be adopted due to rock stratum breakage and overlarge aperture is solved, and digital acquisition of the rock core is realized.
Example 2
As shown in fig. 9, the invention further provides a core digital acquisition method, which is implemented as follows:
s1, placing the borehole downhole probe into the hole, and acquiring the rotation angle of the wellhead pulley by using the depth sensor;
s2, shooting a 360-degree digital image sequence of the inner wall of the drilled hole through a conical reflector by using a camera according to the rotation angle;
and S3, processing the digital image sequence by using an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image, thereby completing the data acquisition of the core.
In this embodiment, the principle of expansion and interpolation is shown in fig. 7 below, and it can be seen from fig. 7 that the hole wall projects on the conical mirror, and the aperture is
But the radius of the top of the conical mirror is
And the bottom radius is
After being unfolded, a rectangular image is formed, and the width of the upper bottom (namely the top of the shooting area) of the rectangle is
And the width of the lower bottom (i.e., the bottom of the photographing region) is
All require interpolation to obtain the actual width of
The pixel value of (2).
In this embodiment, cubic interpolation is adopted, the value of the output pixel is a weighted average of the values of the sampled electrical pixels in a 4 × 4 neighborhood of the input image closest to the input image, and the cubic interpolation approximates a theoretically optimal interpolation function by using a polynomial
. The polynomial is as follows:
in the formula
The distance between the peripheral pixels and the far point along the x direction is used to calculate the pixel
The gray value of (2) is obtained by weighted interpolation of the gray values of 16 points around the gray value, and the calculation formula is as follows:
wherein,
representing a pixel to be solved
I represents the integer part of the abscissa x of the pixel point to be solved, u represents the fractional part of x, j represents the integer part of the ordinate y of the pixel point to be solved, v represents the fractional part of y, a represents the weight vector on the abscissa, B represents the gray value matrix of 16 adjacent pixel points, C represents the weight vector on the ordinate, and S is the value of the weight.
In this embodiment, the image acquisition mode is divided into two modes, namely "timing acquisition" and "counting acquisition":
(1) a timing acquisition mode: the image acquisition is controlled by a clock signal, and the timing signal control program automatically finishes image acquisition at regular intervals by setting time interval parameters. The timed acquisition mode controls the splicing of the acquired images by logging speed, and the speed control is inaccurate, so that the information of the hole wall is lost or repeated, and the splicing of the complete images of the hole wall is influenced. The timing acquisition mode is suitable for the working of numerical control servo motor winches.
(2) Counting and collecting modes: is a way to acquire images with depth control. The accurate logging depth counting controller is communicated with the computer through an interface, controls image acquisition according to a certain step depth and realizes accurate splicing of hole wall images.
In the embodiment, the drilling full well wall imaging technology is adopted, after the hole is drilled, the hole is cleaned through hole cleaning, the drilling acquisition probe is put down into the hole, and a depth sensor is matched to directly acquire a complete 360-degree digital image sequence of the inner wall of the drilling hole. The digital image processing technology is utilized to carry out digital processing, expansion, image segmentation, edge tracking, splicing and 3D restoration on an image sequence acquired underground, so that a complete core digital image is obtained, and the effects are shown in the following fig. 10-fig. 13, wherein fig. 10 is an actually acquired hole wall expansion diagram, fig. 11 is an actually acquired rotary 3D core diagram, fig. 12 is a hole wall expansion diagram after 3D restoration, and fig. 13 is a 3D restored rotary 3D core diagram.
Through the design, the invention solves the problem that the core cannot be adopted due to rock stratum crushing and overlarge aperture, and realizes the digital acquisition of the core.
Claims (8)
1. A core digital acquisition system is characterized by comprising a wellhead pulley, a depth sensor, a tripod and a winch, wherein the depth sensor, the tripod and the winch are respectively connected with the wellhead pulley, an industrial personal computer unit is connected with the depth sensor, and an underground probe unit and a computer image processing unit are respectively connected with the industrial personal computer unit; the winch is positioned on the tripod, and the wellhead pulley is positioned on the tripod and above the winch;
the depth sensor is used for acquiring the rotation angle of the wellhead pulley;
the underground probe unit is used for shooting a 360-degree digital image sequence of the inner wall of the drill hole according to the rotation angle;
the industrial personal computer unit is used for sending the received digital image sequence to the computer image processing unit;
and the computer image processing unit is used for processing the digital image sequence by utilizing an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image and finish the data acquisition of the core.
2. The core digital acquisition system of claim 1, wherein the industrial personal computer unit comprises a controller, an industrial personal computer host connected with the controller, and a display connected with the industrial personal computer host;
the video output end of the controller is connected with the video input end of the industrial personal computer host, and the RS-232 interface of the controller is connected with the RS-232 interface of the industrial personal computer host; the display is connected with the industrial personal computer host through a VGA interface.
3. The digital core acquisition system of claim 2, wherein the computer image processing unit comprises a computer, an image acquisition card and a recorder, wherein the computer is connected with the controller through an RS-232 interface.
4. The core digital acquisition system as claimed in claim 3, wherein the coded input of the controller is connected to the output of the depth sensor.
5. The core digital acquisition system of claim 1, wherein the power supply and the signal of the downhole probe unit are connected with the controller through a transmission cable, wherein the transmission cable is of a 12-core structure.
6. The core digital acquisition system as claimed in claim 5, wherein the downhole probe unit comprises a probe barrel, a camera and an LED illumination source located in the probe barrel and connected to the transmission cable, a conical reflector located in the shooting area, and an embedded north arrow located above the conical reflector; the transmission cable supplies power to the camera and the LED illumination light source.
7. A core digital acquisition method is characterized by comprising the following steps:
s1, placing the borehole downhole probe into the hole, and acquiring the rotation angle of the wellhead pulley by using the depth sensor;
s2, shooting a 360-degree digital image sequence of the inner wall of the drilled hole through a conical reflector by using a camera according to the rotation angle;
and S3, processing the digital image sequence by using an interpolation weighting method, and performing 3D restoration on the processed image to obtain a core digital image, thereby completing the data acquisition of the core.
8. The method for digitally acquiring a core according to claim 7, wherein the expression for processing the digital image sequence by using the interpolation weighting method in step S3 is as follows:
wherein,
representing a pixel to be solved
I represents the integer part of the abscissa x of the pixel point to be solved, u represents the fractional part of x, j represents the integer part of the ordinate y of the pixel point to be solved, v represents the fractional part of y, a represents the weight vector on the abscissa, B represents the gray value matrix of 16 adjacent pixel points, C represents the weight vector on the ordinate, and S is the value of the weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964871.0A CN111827974A (en) | 2020-09-15 | 2020-09-15 | Core digital acquisition system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010964871.0A CN111827974A (en) | 2020-09-15 | 2020-09-15 | Core digital acquisition system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111827974A true CN111827974A (en) | 2020-10-27 |
Family
ID=72919017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010964871.0A Pending CN111827974A (en) | 2020-09-15 | 2020-09-15 | Core digital acquisition system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111827974A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114338975A (en) * | 2021-12-13 | 2022-04-12 | 中国矿业大学 | Underground borehole wall image distribution instrument and use method |
| CN114563829A (en) * | 2022-04-25 | 2022-05-31 | 成都理工大学 | Core digital acquisition system and core digital acquisition method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628861A (en) * | 2013-12-09 | 2014-03-12 | 岳阳奥成科技有限公司 | Intelligent drilling television imaging instrument |
| EP3063368A1 (en) * | 2013-10-29 | 2016-09-07 | Baker Hughes Incorporated | Apparatus to reduce pressure and thermal sensitivity of high precision optical displacement sensors |
| CN107609638A (en) * | 2017-10-12 | 2018-01-19 | 湖北工业大学 | A kind of method based on line decoder and interpolation sampling optimization convolutional neural networks |
| CN108562947A (en) * | 2018-06-08 | 2018-09-21 | 西北大学 | A kind of detection device for vertical shaft or deep hole |
| CN208285405U (en) * | 2018-06-19 | 2018-12-25 | 成都多丽斯科技有限公司 | A kind of underground imaging device |
-
2020
- 2020-09-15 CN CN202010964871.0A patent/CN111827974A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3063368A1 (en) * | 2013-10-29 | 2016-09-07 | Baker Hughes Incorporated | Apparatus to reduce pressure and thermal sensitivity of high precision optical displacement sensors |
| CN103628861A (en) * | 2013-12-09 | 2014-03-12 | 岳阳奥成科技有限公司 | Intelligent drilling television imaging instrument |
| CN107609638A (en) * | 2017-10-12 | 2018-01-19 | 湖北工业大学 | A kind of method based on line decoder and interpolation sampling optimization convolutional neural networks |
| CN108562947A (en) * | 2018-06-08 | 2018-09-21 | 西北大学 | A kind of detection device for vertical shaft or deep hole |
| CN208285405U (en) * | 2018-06-19 | 2018-12-25 | 成都多丽斯科技有限公司 | A kind of underground imaging device |
Non-Patent Citations (1)
| Title |
|---|
| 温特科恩等: "《基础工程手册》", 30 April 1983 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114338975A (en) * | 2021-12-13 | 2022-04-12 | 中国矿业大学 | Underground borehole wall image distribution instrument and use method |
| CN114338975B (en) * | 2021-12-13 | 2022-11-08 | 中国矿业大学 | Underground borehole wall image distribution instrument and use method |
| CN114563829A (en) * | 2022-04-25 | 2022-05-31 | 成都理工大学 | Core digital acquisition system and core digital acquisition method |
| CN114563829B (en) * | 2022-04-25 | 2022-10-21 | 成都理工大学 | Core digital acquisition system and core digital acquisition method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103628861B (en) | A kind of intelligent drilling television imager | |
| CA1319527C (en) | Bore hole scanner with position detecting device and light polarizers | |
| US20140278111A1 (en) | Borehole instrument for borehole profiling and imaging | |
| CN106780284B (en) | Tunnel wall surrounding rock integrity information acquisition device and evaluation method | |
| CN111827974A (en) | Core digital acquisition system and method | |
| CN105804721A (en) | Karst cave probing system and using method thereof | |
| CN114135272B (en) | Geological drilling three-dimensional visualization method and device combining laser and vision | |
| JP3119012U (en) | Dedicated borehole TV camera for creating a hole wall unfolded image by image processing forward video video in the hole using computer software | |
| KR20090066597A (en) | Probe and analysis system of pipe inner and outer surface | |
| CN106651951A (en) | Atmospheric polarization mode detection and course calculation system and method | |
| CN213039271U (en) | Drilling digital core acquisition device | |
| CN104980634A (en) | Optical imaging device for underground detection | |
| CN108222840A (en) | A kind of multi-functional failure analysis | |
| CN203655270U (en) | Intelligent drilling television imaging instrument | |
| CN106403893A (en) | Multi-senor control system of tunnel inspection vehicle | |
| CN112727443A (en) | High-definition imaging device for large-aperture inclined shaft and vertical shaft | |
| CN112483071A (en) | Drilling core image recognition device and method | |
| CN209742880U (en) | drilling information acquisition device based on DIC technology | |
| CN208285405U (en) | A kind of underground imaging device | |
| CN215332798U (en) | Utilize country rock geology detection device of inclined shaft pilot hole | |
| JP2724833B2 (en) | Manufacturing apparatus and manufacturing method of hole wall developed image | |
| CN113223203A (en) | Post-construction operation and maintenance inspection instrument and inspection method for completed pipelines | |
| CN217386132U (en) | Panoramic drilling camera probe | |
| CN106382115A (en) | Roller delivering type borehole television system and detection method of same | |
| AU2014201570A1 (en) | Borehole instrument for borehole profiling and imaging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201027 |