CN113218838B - Coal core permeability tester and measuring method - Google Patents
Coal core permeability tester and measuring method Download PDFInfo
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- CN113218838B CN113218838B CN202110441236.9A CN202110441236A CN113218838B CN 113218838 B CN113218838 B CN 113218838B CN 202110441236 A CN202110441236 A CN 202110441236A CN 113218838 B CN113218838 B CN 113218838B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention belongs to the technical field of coal core permeability detection, and discloses a coal core permeability tester and a measuring method, wherein the method comprises the following steps: the device comprises a coal core two-side air pressure detection module, a coal core two-phase flow pressure detection module, a test piece surface crack and fracture information processing module, a strain change measurement module, a gas flow rate detection module, a liquid flow rate detection module, a display module, a central processing module, a signal transmission module, a cloud service module, an air pressure control module, a hydraulic control module, a signal processing module, a signal conversion module and a permeability analysis module. The coal core permeability tester can be used for singly testing gas permeability, singly testing liquid permeability and simultaneously testing gas-liquid two-phase flow permeability. Compared with the prior test penetrometer which can only test gas, liquid and solid singly, the utility model has the advantages of innovation and improvement, and provides new technology and new method for the current test penetration field.
Description
Technical Field
The invention belongs to the technical field of coal core permeability detection, and particularly relates to a coal core permeability tester and a coal core permeability testing method.
Background
At present, coal mainly comprises elements such as carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus and the like, the sum of the carbon, the hydrogen and the oxygen accounts for more than 95 percent of organic matters, and the coal is an important energy source, is also an important raw material in the metallurgical and chemical industries, and is classified into lignite, bituminous coal, anthracite and semi-anthracite. The famous composer Zhu Ziqing also writes a poem with the title of coal, giving it a unique symbolism. By 2019, china is the country with the largest coal yield in the world, and the coal yield is 32.5 hundred million tons, which is equivalent to 18.004 hundred million tons of oil equivalent and accounts for up to 48.3 percent of the world; secondly, the yield ratio in the United states is 14.8 percent of the world; the third rank is Australia, accounting for 6.3% of world production; india and indonesia rank fourth five, respectively, with world production ratios of 5.8% and 5.0%, respectively. The coal resources are fully entering the mining stage of a kilometer deep well, and the typical high ground stress, high gas pressure, high karst water pressure, high ground temperature and strong unloading characteristics of the deep coal rock mass enable high-strength dynamic disasters to frequently occur in mining activities, so that the current seepage disaster theory based on shallow engineering conditions can not meet the requirements of safe and efficient mining of the coal resources, and research on the dynamic disaster mechanism of the coal rock mass in deep complex geological environments is urgently needed. In view of the current situation, the invention researches the dynamic evolution rule of the lower deep coal rock mass fracture field for the cyclic mining action and discusses the control effect of the fracture field evolution on the water-gas seepage process. In order to achieve efficient mining of a coal seam, it is necessary to detect the permeability of the coal core. However, in the existing coal core permeability tester, only the only parameter of the gas pressure or only the only parameter of the liquid pressure can be obtained in the testing process, the gas pressure parameter and the liquid pressure parameter cannot be controlled at the same time, and the accuracy of the coal core permeability testing cannot be improved. Meanwhile, in the measuring process of the existing coal core permeability measuring instrument, acquired data are manually processed, so that the efficiency and the accuracy are reduced, and corresponding results cannot be objectively made on the permeability of the coal core.
Through the above analysis, the problems and defects existing in the prior art are as follows:
(1) In the existing coal core permeability tester, only the unique parameter of gas pressure or only the unique parameter of liquid pressure can be obtained in the testing process, the pressure parameters of gas and liquid can not be controlled at the same time, and the accuracy of coal core permeability testing can not be improved.
(2) The image processing of the two-phase fluid seepage damage test piece is simpler.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a coal core permeability tester and a measuring method.
The invention is realized in such a way that a coal core permeability measuring method comprises the following steps:
step one, detecting the pressure of the air inlet side and the pressure of the air outlet side of the coal core through pressure sensors by the air pressure detection modules on the two sides of the coal core; the hydraulic detection modules at two sides of the coal core detect the pressure at the liquid inlet side and the pressure at the liquid outlet side of the coal core through the pressure sensor; the pressure detection module of the coal core two-phase flow detects the pressure of the coal core gas-liquid two-phase flow through pressure sensing; the surface crack and fracture information processing module of the test piece respectively acquires the information of the distribution of the rock core cracks or the fracture through a three-eye camera, and processes the acquired surface crack and fracture information of the damaged test piece;
step two, the strain change measuring module detects the deformation amount by using a displacement sensor through a displacement detection sensor, calculates a strain value and collects the deformation amount of the coal rock; the gas flow rate detection module detects the gas flow rates at two sides of the rock core through a gas flow rate sensor; the liquid flow rate detection module detects the liquid flow rates at two sides of the rock core through a liquid flow rate sensor;
the central processing module is respectively connected with the air pressure detection modules at two sides of the coal core, the hydraulic pressure detection modules at two sides of the coal core, the pressure detection modules of two-phase flow of the coal core, the surface crack of a test piece, the fracture information processing module, the strain change measurement module, the gas flow rate detection module, the display module, the liquid flow rate detection module, the signal transmission module, the air pressure control module, the hydraulic control module, the signal processing module, the signal conversion module and the permeability analysis module, and coordinates the normal operation of each module;
step four, the air pressure control module controls the pressure of the gas permeated by the coal core through the air pump; the hydraulic control module controls the pressure of the liquid permeated by the coal core through the liquid pump; the signal processing module processes signals detected by various sensors through a signal processing program; the signal conversion module converts the electric signal into a digital signal through a signal conversion program; the permeability analysis module is used for analyzing the permeability of the coal core according to various data of the detected coal core;
step five, the display module is used for displaying corresponding data through a display screen; the signal transmission module builds a bridge between the central processing module and the cloud service module through signal transmission equipment; the cloud service module processes data in the coal core permeability measuring system through a big data processing technology.
Further, in the first step, the processing of the surface crack and fracture information of the obtained damaged test piece by the test piece surface crack and fracture information processing module through the three-eye camera includes:
establishing a corresponding information set from the acquired information of the fracture distribution or fracture of the coal core;
carrying out gray scale processing on the image data in the set, and carrying out filtering/edge detection/segmentation;
and after the image preprocessing is finished, extracting the characteristic value and identifying.
Further, the filtering and denoising process of the images on two sides of the coal rock core comprises the following steps:
determining a circular neighborhood taking a certain pixel as a center point in images on two sides of a coal core;
sequencing the gray values of the pixels in the neighborhood, and taking the intermediate value as a new value of the gray of the central pixel;
the circular neighborhood is moved, and the image can be smoothed by median filtering.
Further, in the second step, the specific process of collecting the thickness of the coal rock by the strain change measurement module through the thickness detection sensor is as follows:
two metal electrode plates are arranged on two sides of the coal rock to be tested to form a capacitor;
since the capacitance of a capacitor is related to the thickness of the medium, the capacitor is a component of the oscillator;
the capacitance value can be determined by measuring the oscillation frequency of the oscillator, thereby measuring the thickness of the material.
Further, in the fourth step, the permeability analysis module analyzes the permeability of the coal core according to the detected various data of the coal core, and in the process:
the air pressure detection modules at two sides of the coal core transmit the information to the central processing module;
the central processing module obtains the pressure difference between the front and the back of the core and the flow corresponding to the pressure, and the permeability of the core can be obtained by taking the pressure difference into a permeability formula.
Further, in the fourth step, the specific process of the signal conversion module converting the electrical signal into the digital signal through the signal conversion program is as follows:
respectively establishing corresponding electric signal sets from the pressure electric signals detected by the air pressure detection modules at two sides of the coal core, the thickness electric signals detected by the strain change measurement module, the gas flow velocity electric signals detected by the gas flow velocity detection module and the liquid flow velocity electric signals detected by the liquid flow velocity detection module;
the above-described electric signal is subjected to physical quantity discretization and quantization encoding, thereby becoming a digital signal.
Another object of the present invention is to provide a coal core permeability tester for implementing the coal core permeability testing method, the coal core permeability tester comprising:
the pressure detection modules at two sides of the coal core are connected with the central processing module, and detect the pressure at the air inlet side and the pressure at the air outlet side of the coal core through the pressure sensor; the hydraulic detection modules at two sides of the coal core detect the pressure at the liquid inlet side and the pressure at the liquid outlet side of the coal core through the pressure sensor; the pressure detection module of the coal core two-phase flow detects the pressure of the coal core gas-liquid two-phase flow through pressure sensing;
the surface crack and fracture information processing module is connected with the central processing module, respectively acquires the information of the rock core crack distribution or fracture through a three-eye camera, and processes the acquired surface crack and fracture information of the damaged test piece;
the strain change measuring module is connected with the central processing module and is used for collecting the thickness of the coal rock through the thickness detecting sensor;
the gas flow rate detection module is connected with the central processing module and is used for detecting the air flow rates at two sides of the rock core through the gas flow rate sensor;
the liquid flow rate detection module is connected with the central processing module and is used for detecting the liquid flow rates at two sides of the rock core through the liquid flow rate sensor;
the display module is connected with the central processing module and is used for displaying corresponding data through a display screen;
the central processing module is respectively connected with the air pressure detection module at two sides of the coal core, the hydraulic pressure detection module at two sides of the coal core, the pressure detection module of the two-phase flow of the coal core, the surface crack of the test piece, the fracture information processing module, the strain change measurement module, the gas flow rate detection module, the liquid flow rate detection module, the display module, the signal transmission module, the air pressure control module, the signal processing module, the signal conversion module and the permeability analysis module, and coordinates the normal operation of each module.
Further, the coal core permeability tester further includes:
the signal transmission module is connected with the central processing module and is used for constructing a bridge between the central processing module and the cloud service module through signal transmission equipment;
the cloud service module is connected with the signal transmission module and is used for processing data in the coal core permeability measuring system through a big data processing technology;
the air pressure control module is connected with the central processing module and is used for controlling the air pressure of the coal core permeation through the air pump;
the hydraulic control module is connected with the central processing module and is used for controlling the pressure of the liquid permeated by the coal core through the liquid pump;
the signal processing module is connected with the central processing module and processes signals detected by various sensors through a signal processing program;
the signal conversion module is connected with the central processing module and converts the electric signal into an electric signal through a signal conversion program;
and the permeability analysis module is connected with the central processing module and is used for analyzing the permeability of the coal core according to various data of the detected coal core.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program, which when executed on an electronic device, provides a user input interface to implement the method of coal core permeability determination.
It is another object of the present invention to provide a computer readable storage medium storing instructions that, when run on a computer, cause the computer to perform the method of coal core permeability determination.
By combining all the technical schemes, the invention has the advantages and positive effects that: according to the invention, various parameters of the coal core are detected through the air pressure detection modules at the two sides of the coal core, the hydraulic pressure detection modules at the two sides of the coal core, the two-phase flow pressure detection modules of the coal core, the surface crack of the test piece, the fracture information processing module, the strain change measurement module, the gas flow rate detection module and the liquid flow rate detection module, so that the detection permeability is improved; according to the invention, the data can be processed by utilizing a big data processing technology through the signal transmission module and the cloud service module, so that the efficiency and the quality of data processing are improved. The invention can adjust the pressure applied to the coal core outside the system at any time according to the air pressure and the hydraulic pressure by arranging the air pressure control module and the hydraulic pressure control module. Meanwhile, the permeability analysis module is arranged, so that the permeability of the coal core can be comprehensively analyzed according to various acquired parameters.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a coal core permeability tester provided by an embodiment of the invention.
Fig. 2 is a flow chart of a method for measuring permeability of a coal core provided by an embodiment of the invention.
Fig. 3 is a flowchart of a method for processing surface cracks and fracture information of a damaged test piece obtained by a test piece surface crack and fracture information processing module according to an embodiment of the present invention through a three-eye camera.
Fig. 4 is a flowchart of a method for filtering and denoising images on two sides of a coal core according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for collecting the thickness of coal and rock by the strain change measuring module according to the embodiment of the invention through the thickness detecting sensor.
Fig. 6 is a flowchart of an implementation of a method for measuring permeability of a coal core according to an embodiment of the present invention.
In the figure: 1. the air pressure detection modules are arranged at two sides of the coal core; 2. a test piece surface crack and fracture information processing module (image processing module); 3. a strain change measurement module; 4. a gas flow rate detection module; 5. the liquid flow rate detection module, 6 and the display module; 7. a central processing module; 8. a signal transmission module; 9. a cloud service module; 10. an air pressure control module; 11 hydraulic control module, 12, signal processing module; 13. a signal conversion module; 14. and a permeability analysis module.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides a coal core permeability tester and a measuring method, and the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the coal core permeability tester provided by the embodiment of the invention comprises:
the air pressure detection modules 1 on two sides of the coal core are connected with the central processing module 7, and detect the pressure on the air inlet side and the pressure on the air outlet side of the coal core and detect the pressure on the liquid inlet side and the pressure on the liquid outlet side of the coal core through pressure sensors.
And the test piece surface crack and fracture information processing module 2 is connected with the central processing module 7, respectively acquires the information of the rock core crack distribution or fracture through a three-eye camera, and processes the acquired surface crack and fracture information of the damaged test piece.
The strain change measuring module 3 is connected with the central processing module 7 and is used for collecting the thickness of the coal rock through the thickness detection sensor
The gas flow rate detection module 4 is connected with the central processing module 7 and detects the gas flow rates at the two sides of the rock core through a gas flow rate sensor
The liquid flow rate detection module 5 is connected with the central processing module 7 and detects the liquid flow rates at two sides of the rock core through the liquid flow rate sensor.
The display module 6 is connected with the central processing module 7 and is used for displaying corresponding data through a display screen.
The central processing module 7 is respectively connected with the air pressure detection module 1 on two sides of the coal core, the test piece surface crack and fracture information processing module 2, the strain change measurement module 3, the air flow rate detection module 4, the liquid flow rate detection module 5, the display module 6, the signal transmission module 8, the air pressure control module 10, the hydraulic control module 11, the signal processing module 12, the signal conversion module 13 and the permeability analysis module 14, and coordinates the normal operation of each module.
The signal transmission module 8 is connected with the central processing module 7, and a bridge between the central processing module and the cloud service module is built through signal transmission equipment.
The cloud service module 9 is connected with the signal transmission module 8 and processes data in the coal core permeability measuring system through a big data processing technology.
The air pressure control module 10 is connected with the central processing module 7 and controls the air pressure of the coal core permeation through an air pump.
The hydraulic control module 11 is connected with the central processing module 7 and controls the pressure of the liquid permeated by the coal core through the liquid pump.
The signal processing module 12 is connected to the central processing module 7, and processes signals detected by various sensors by a signal processing program.
The signal conversion module 13 is connected with the central processing module 7 and converts the electric signals into electric signals through a signal conversion program.
And the permeability analysis module 14 is connected with the central processing module 7 and is used for analyzing the permeability of the coal core according to various data of the detected coal core.
As shown in fig. 2, the method for measuring the permeability of the coal core provided by the embodiment of the invention comprises the following steps:
s101: the pressure detection modules at two sides of the coal core detect the pressure at the air inlet side and the pressure at the air outlet side of the coal core and detect the pressure at the liquid inlet side and the pressure at the liquid outlet side of the coal core through the pressure sensors; the pressure detection module of the coal core two-phase flow detects the pressure of the coal core gas-liquid two-phase flow through pressure sensing; and the test piece surface crack and fracture information processing module respectively acquires the information of the rock core crack distribution or fracture through a three-eye camera, and processes the acquired surface crack and fracture information of the damaged test piece.
S102: the strain change measuring module detects the deformation by using the displacement sensor through the displacement detection sensor, calculates the strain value and collects the deformation of the coal rock; the gas flow rate detection module detects the gas flow rate at two sides of the rock core through the gas flow rate sensor, and the liquid flow rate detection module detects the liquid flow rate at two sides of the rock core through the liquid flow rate sensor.
S103: the central processing module is respectively connected with the air pressure detection module at two sides of the coal core, the hydraulic pressure detection module at two sides of the coal core, the pressure detection module of two-phase flow of the coal core, the surface crack and fracture information processing module of the test piece, the strain change measurement module, the gas flow rate detection module, the liquid flow rate detection module, the display module, the signal transmission module, the air pressure control module, the hydraulic control module, the signal processing module, the signal conversion module and the permeability analysis module, and coordinates the normal operation of each module.
S104: the air pressure control module controls the air pressure of the coal core through the air pump; the hydraulic control module controls the pressure of the liquid permeated by the coal core through the liquid pump; the signal processing module processes signals detected by various sensors through a signal processing program; the signal conversion module converts the electric signal into a digital signal through a signal conversion program; and the permeability analysis module is used for analyzing the permeability of the coal core according to various data of the detected coal core.
S105: the display module is used for displaying corresponding data through a display screen; the signal transmission module builds a bridge between the central processing module and the cloud service module through signal transmission equipment; the cloud service module processes data in the coal core permeability measuring system through a big data processing technology.
In S101 provided by the embodiment of the present invention, the process of processing, by the test piece surface crack and fracture information processing module, the obtained surface crack and fracture information of the damaged test piece by the three-eye camera is:
s201: the collected images of two sides of the coal core are established to form a corresponding image set;
s202: carrying out gray scale processing on the image data in the set, and carrying out filtering/edge detection/segmentation;
s203: and after the image preprocessing is finished, extracting the characteristic value and identifying.
The images in steps S201 to S203 are surface crack and fracture information of the test piece after the damage.
The process of filtering and denoising the images on two sides of the coal rock core comprises the following steps:
s301: determining a circular neighborhood taking a certain pixel as a center point in images on two sides of a coal core;
s302: sequencing the gray values of the pixels in the neighborhood, and taking the intermediate value as a new value of the gray of the central pixel;
s303: the circular neighborhood is moved, and the image can be smoothed by median filtering.
The image is the surface crack and fracture information of the damaged test piece.
In S102 provided by the embodiment of the present invention, the specific process of collecting the thickness of the coal rock by the strain change measurement module through the thickness detection sensor is:
s401: two metal electrode plates are arranged on two sides of the coal rock to be tested to form a capacitor;
s402: since the capacitance of a capacitor is related to the thickness of the medium, the capacitor is a component of the oscillator;
s403: the capacitance value can be determined by measuring the oscillation frequency of the oscillator, thereby measuring the thickness of the material.
In S104 provided by the embodiment of the present invention, the permeability analysis module analyzes the permeability of the coal core according to the detected various data of the coal core, during the process of analyzing the permeability of the coal core:
the air pressure detection modules at two sides of the coal core transmit the information to the central processing module;
the central processing module obtains the pressure difference between the front and the back of the core and the flow corresponding to the pressure, and the permeability of the core can be obtained by taking the pressure difference into a permeability formula.
In S104 provided by the embodiment of the present invention, the specific process of the signal conversion module converting the electrical signal into the digital signal through the signal conversion program is:
respectively establishing corresponding electric signal sets from the pressure electric signals detected by the air pressure detection modules at two sides of the coal core, the thickness electric signals detected by the strain change measurement module, the gas flow velocity electric signals detected by the gas flow velocity detection module and the liquid flow velocity electric signals detected by the liquid flow velocity detection module;
the above-described electric signal is subjected to physical quantity discretization and quantization encoding, thereby becoming a digital signal.
While the invention has been described with respect to what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (2)
1. A coal core permeability tester, characterized in that the coal core permeability tester comprises:
the pressure detection modules at two sides of the coal core are connected with the central processing module, and detect the pressure at the air inlet side and the pressure at the air outlet side of the coal core through the pressure sensor; the hydraulic detection modules at two sides of the coal core detect the pressure at the liquid inlet side and the pressure at the liquid outlet side of the coal core through the pressure sensor; the pressure detection module of the coal core two-phase flow detects the pressure of the coal core gas-liquid two-phase flow through the pressure sensor;
the surface crack and fracture information processing module is connected with the central processing module, respectively acquires the information of the rock core crack distribution or fracture through a three-eye camera, and processes the acquired surface crack and fracture information of the damaged test piece;
the strain change measuring module is connected with the central processing module and is used for collecting the thickness of the coal rock through the thickness detecting sensor; the strain change measuring module is used for collecting the thickness of the coal rock through the thickness detecting sensor, and the specific process is as follows:
two metal electrode plates are arranged on two sides of the coal rock to be tested to form a capacitor;
since the capacitance of a capacitor is related to the thickness of the medium, the capacitor is a component of the oscillator;
the capacitance value can be determined by measuring the oscillation frequency of the oscillator, so that the thickness of the material is measured;
the gas flow rate detection module is connected with the central processing module and is used for detecting the air flow rates at two sides of the coal core through the gas flow rate sensor;
the liquid flow rate detection module is connected with the central processing module and is used for detecting the liquid flow rates at two sides of the coal core through the liquid flow rate sensor;
the display module is connected with the central processing module and is used for displaying corresponding data through a display screen;
the central processing module is respectively connected with the air pressure detection module at two sides of the coal core, the hydraulic pressure detection module at two sides of the coal core, the pressure detection module of the two-phase flow of the coal core, the surface crack of the test piece, the fracture information processing module, the strain change measurement module, the gas flow rate detection module, the liquid flow rate detection module, the display module, the signal transmission module, the air pressure control module, the signal processing module, the signal conversion module and the permeability analysis module, and coordinates the normal operation of each module.
2. The coal core permeability meter of claim 1, wherein the coal core permeability meter further comprises:
the signal transmission module is connected with the central processing module and is used for constructing a bridge between the central processing module and the cloud service module through signal transmission equipment;
the cloud service module is connected with the signal transmission module and is used for processing data in the coal core permeability measuring system through a big data processing technology;
the air pressure control module is connected with the central processing module and is used for controlling the air pressure of the coal core permeation through the air pump;
the hydraulic control module is connected with the central processing module and is used for controlling the pressure of the liquid permeated by the coal core through the liquid pump;
the signal processing module is connected with the central processing module and processes signals detected by various sensors through a signal processing program;
the signal conversion module is connected with the central processing module and converts the electric signal into a digital signal through a signal conversion program;
and the permeability analysis module is connected with the central processing module and is used for analyzing the permeability of the coal core according to various data of the detected coal core.
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