CN110646584B - Similar simulation method and device for coal seam water injection hole sealing test - Google Patents
Similar simulation method and device for coal seam water injection hole sealing test Download PDFInfo
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Abstract
The invention relates to a similar simulation method and a similar simulation device for a coal seam water injection hole sealing test, which belong to the technical field of coal seam water injection, and the similar simulation method for the coal seam water injection hole sealing test comprises the following steps: s1 determining experimental parameters: building a water injection hole sealing stress model to obtain a simulation similarity ratio; determining experimental parameters and coal sample size specifications according to the thickness of the on-site coal seam and parameters influencing the similarity ratio; s2, making a small briquette sample and a large briquette sample; s3, carrying out a similar hole sealing test to obtain the actual water injection pressure; and S4, inverting the actual hole sealing pressure bearing capacity on site according to the simulation similarity ratio and the actual water injection pressure. According to the invention, through a similar hole sealing experiment, the actual hole sealing bearing capacity on site is inverted, and the problem that the seal can not be accurately corrected according to the water injection pressure on site is solved.
Description
Technical Field
The invention belongs to the technical field of coal seam water injection, and relates to a similar simulation method and device for a coal seam water injection hole sealing test.
Background
Dust harm is always the key point of prevention and control in the coal mining process, not only seriously harms the physical and mental health of coal mine workers, but also has great influence on the safety production of coal mines.
Along with the continuous improvement of coal mining intensity, the dust production intensity of a working face is continuously increased, and the dust concentration of a fully mechanized face can reach 3000mg/m3 at most according to the display of field actual measurement data.
Coal seam water injection is one of the most effective comprehensive dustproof measures, and one of the key factors influencing the coal seam water injection effect is the hole sealing quality.
The common hole sealing methods include mechanical hole sealing and mixed slurry hole sealing, but the traditional hole sealing methods are only used for simply carrying out on-site hole sealing and cannot correct hole sealing according to the conditions of the actual condition of a coal seam, the size of confining pressure and the like, so that the water injection effect of the coal seam is not ideal; the sealing is often failed due to a large amount of water leakage caused by insufficient pressure bearing capacity of the sealing, and the dust pollution is still serious.
Disclosure of Invention
In view of this, an object of the present application is to provide a similar simulation method and apparatus for a coal seam water injection hole sealing test, which invert the actual hole sealing pressure-bearing capacity on site through a similar hole sealing test, and solve the problem that the seal cannot be accurately corrected according to the water injection pressure on site.
In order to achieve the purpose, the invention provides the following technical scheme:
a similar simulation method for a coal seam water injection hole sealing test comprises the following steps:
s1 determining experimental parameters: building a water injection hole sealing stress model according to the stress characteristics of the water injection hole sealing to obtain a simulation similarity ratio
Wherein, P0P is the similar model and the actual water injection pressure on site respectively, and the unit is MPa;
σ0and sigma is the similar model and the actual on-site confining pressure stress in unit MPa respectively;
D0d is the diameter of the similar model and the actual drilling hole on site respectively, and the unit is mm;
L0and L is the length of the similar model and the field actual hole sealing respectively, and the unit is mm;
determining experimental parameters and coal sample size specifications according to the thickness of the on-site coal bed and parameters influencing the similarity ratio, wherein the parameters influencing the similarity ratio refer to confining pressure stress, the diameter of a drill hole and the length of a hole sealing, and the experimental parameters refer to water injection pressure;
s2 coal sample preparation:
s2.1, preparing a small sample of the briquette: using an on-site coal sample, and manufacturing a small molded coal sample with a similarity rate of not less than 95% to the basic parameters of the on-site coal sample by adopting a charging processing mode, wherein the basic parameters refer to mechanical parameters and porosity parameters; the specification of the small briquette sample is easy to test the basic parameters;
s2.2, manufacturing a large sample of the briquette: manufacturing a large molded coal sample according to the component ratio of the small molded coal sample, and embedding a water injection pipe in the large molded coal sample, wherein the water injection pipe penetrates through the large molded coal sample; the specification of the large briquette sample is suitable for hole sealing experiments;
s3 similar pore sealing test:
applying similar model confining pressure sigma to large sample of molded coal0Loading the water injection system from 0.1MPa, increasing the water injection pressure by 0.1MPa every 1 minute until the water leakage in the hole is stopped, and recording the actual water injection pressure P (test) and the water leakage V;
s4 inversion of on-site actual hole sealing capability:
according to analog similarity ratio
And actual water injection pressure P (test), inverting the actual hole sealing bearing capacity on site:
optionally, the preparation of the briquette small sample comprises the following steps:
s2.11, taking a site coal sample, and testing basic parameters of the site coal sample, wherein the basic parameters refer to mechanical parameters and porosity parameters, and the basic parameters are used as basic parameters for manufacturing the briquette coal sample;
s2.12, crushing the on-site coal sample, and adding the adhesives and the sands with different proportions to prepare a plurality of small samples with different component proportions;
s2.13 testing basic parameters of the small sample;
s2.14, selecting a small sample with the similarity rate of not less than 95% with the basic parameters of the on-site coal sample as a small briquette sample.
Optionally, the method is applied to hole sealing simulation experiments of different hole sealing materials.
Optionally, the method is applied to testing the maximum limit pressure and the water leakage amount which can be borne by different hole sealing processes.
Optionally, in step S2.11, a mechanical testing machine is used to test the compression, tension and shear mechanical parameters.
Optionally, in step S2.11, the porosity parameter is measured using a mercury porosimeter and a nuclear magnetic resonance system.
Optionally, the size specification of the small sample of the briquette in step S2.1 is phi 25mm x 60 mm.
Optionally, the size specification of the large sample of briquettes in step S2.2 is 400 × 400 × 4000 mm.
A similar simulation device for a coal seam water injection and hole sealing test comprises a molded coal pressing device and a water injection system; the molded coal pressing device comprises a mold box, a peripheral supporting box body, a transfer beam and a water injection pipe embedded in the molded coal, wherein the water injection pipe is used for forming a water injection hole of the molded coal; avoidance holes of water injection pipes are formed in two ends of the die box, the top end of the die box is open, and the transfer beam is arranged at the open position of the die box; the peripheral supporting box body is provided with a cavity matched with the circumferential direction of the mould box, and the mould box is positioned in the cavity of the peripheral supporting box body; the water injection system comprises a water inlet pipeline and a water outlet pipeline which are connected with two ends of the water injection hole; the water inlet pipeline comprises a pump station and a water tank which are sequentially arranged along the fluid flowing direction; one end of the water outlet pipeline is communicated with the water tank, and the water outlet pipeline is provided with a pressure detection unit and a flow detection unit.
Optionally, the avoiding hole is a kidney-shaped hole.
Optionally, the peripheral support box is of a segmented construction.
Optionally, the method is applied to a similar hole sealing test in a similar simulation method of a coal seam water injection hole sealing test.
Optionally, a cover plate is arranged above the mold box, and the cover plate is fixedly connected to one end, close to the mold box, of the transfer beam.
The invention has the beneficial effects that:
1. the invention solves the technical problem of coal mine on-site hole sealing, and improves the water injection efficiency of the coal seam through effective hole sealing. By utilizing the simulation system, the on-site actual coal seam sealing capacity can be inverted through a laboratory type coal seam sealing experiment, the sealing effect is detected, the problem that sealing is invalid due to a large amount of water leakage of sealing caused by insufficient sealing bearing capacity is solved, and the working difficulty of a coal mine site is greatly reduced.
2. The method can be used for inverting the actual hole sealing capability on site, can also be applied to hole sealing simulation experiments of different hole sealing materials, tests the maximum limit pressure and water leakage quantity which can be borne by different hole sealing technologies, evaluates the hole sealing effect of different hole sealing technology technologies, and effectively predicts the actual hole sealing capability on site.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a coal seam water injection hole sealing test simulation;
FIG. 2 is a first structural schematic diagram of a coal seam water injection hole sealing test simulation;
FIG. 3 is a second structural schematic diagram of a coal seam water injection hole sealing test simulation;
FIG. 4 is a schematic structural view of a briquette pressing apparatus;
FIG. 5 is a schematic view of the structure of the mold box;
FIG. 6 is a schematic view of the structure of the peripheral support box;
FIG. 7 is a schematic structural view of a transfer beam;
FIG. 8 is a hole sealing water injection calculation model.
Reference numerals: the device comprises a molded coal sample 1, a pressurizing device 2, a peripheral supporting box body 3, a water inlet pipeline 4, a pump station 5, a water tank 6, a pressure detection unit 7, a flow detection unit 8, a hole sealing part 9, a water injection hole 10, a mold box 11, a transfer beam 13 and a water outlet pipeline 14.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
A similar simulation method for a coal seam water injection hole sealing test comprises the following steps:
s1 determining experimental parameters: building a water injection hole sealing stress model according to the stress characteristics of the water injection hole sealing to obtain a simulation similarity ratio
Wherein, P0P is the similar model and the actual water injection pressure on site respectively, and the unit is MPa;
σ0and sigma is the similar model and the actual on-site confining pressure stress in unit MPa respectively;
D0d is the diameter of the similar model and the actual drilling hole on site respectively, and the unit is mm;
L0and L is the length of the similar model and the field actual hole sealing respectively, and the unit is mm;
determining experimental parameters and coal sample size specifications according to the thickness of the on-site coal bed and parameters influencing the similarity ratio, wherein the parameters influencing the similarity ratio refer to confining pressure stress, the diameter of a drill hole and the length of a hole sealing, and the experimental parameters refer to water injection pressure;
s2 coal sample preparation:
s2.1, preparing a small sample of the briquette: using an on-site coal sample, and manufacturing a small molded coal sample with a similarity rate of not less than 95% to the basic parameters of the on-site coal sample by adopting a charging processing mode, wherein the basic parameters refer to mechanical parameters and porosity parameters; the specification of the small briquette sample is easy to test the basic parameters, and the manufacture of the small briquette sample comprises the following steps:
s2.11, taking a site coal sample, and testing basic parameters of the site coal sample, wherein the basic parameters refer to mechanical parameters and porosity parameters, and the basic parameters are used as basic parameters for manufacturing the briquette coal sample;
s2.12, crushing the on-site coal sample, and adding the adhesives and the sands with different proportions to prepare a plurality of small samples with different component proportions;
s2.13 testing basic parameters of the small sample;
s2.14, selecting a small sample with the similarity rate of not less than 95 percent of the basic parameters of the on-site coal sample as a small briquette sample;
s2.2, manufacturing a large sample of the briquette: manufacturing a large molded coal sample according to the component ratio of the small molded coal sample, and embedding a water injection pipe in the large molded coal sample, wherein the water injection pipe penetrates through the large molded coal sample; the specification of the large briquette sample is suitable for hole sealing experiments;
s3 similar pore sealing test:
applying similar model confining pressure sigma to large sample of molded coal0Loading the water injection system from 0.1MPa, increasing the water injection pressure by 0.1MPa every 1 minute until the water leakage in the hole is stopped, and recording the actual water injection pressure P (test) and the water leakage V;
s4 inversion of on-site actual hole sealing capability:
according to analog similarity ratio
And actual water injection pressure P (test), inverting the actual hole sealing bearing capacity on site:
in this embodiment, a 3000t press is used to simulate a coal seam confining pressure environment with a depth of 800m, the simulation ratio is 1:1, that is, the experimental confining pressure stress is the same as the field actual confining pressure stress with a depth of 800m, and the diameter of the experimental seal is set to be equal to the diameter of the field actual borehole.
The method for simulating the hole sealing by the simulating method builds a hole sealing simulation platform by the drilling simulating technology, not only can be used for inverting the actual hole sealing capability on site, but also can be applied to hole sealing by chemical materials, cement mortar hole sealing, hole sealing devices and the like to carry out hole sealing simulation tests, tests the maximum limit pressure and the water leakage quantity which can be borne by different hole sealing technologies, evaluates the hole sealing effect of the different hole sealing technologies, and effectively predicts the actual hole sealing capability on site.
Determining the hole sealing similar proportion according to the field actual hole sealing length and stress analysis, and setting the hole sealing length size of the similar test according to the hole sealing similar proportion; the method comprises the steps of crushing an on-site coal sample into powder, adding a proper amount of adhesive and water, pressing the molded coal by a press machine, forming a confined pressure environment the same as that of the on-site environment, drilling and sealing holes by a small-sized drilling machine according to on-site drilling and hole sealing process parameters, carrying out a water injection and hole sealing test from 0.1MPa, stopping the test and recording water injection pressure when water leaks in the holes, and calculating the actual pressure bearing size of the hole sealing and sealing in the site according to a similar relation so as to evaluate the on-site hole sealing capacity. The similar simulation principle of the coal seam water injection hole sealing test is shown in figure 1.
The specific test method is as follows:
1. simulation similarity ratio determination:
the stress of the coal seam water injection and hole sealing material is mainly the friction force generated by the coal wall of a drilled hole on the periphery of the material, and the thrust and the friction force generated by the water injection pressure on the hole sealing material body form a balanced state, so that the hole sealing and plugging capacity is realized. When the thrust is increased to the maximum friction force after the water injection pressure is increased, the hole sealing material body slides, so that the hole sealing capability is lost. The hole sealing water injection calculation model is shown in fig. 8.
Because the similar test is used for testing the maximum pressure-bearing capacity of the hole sealing body, when the model is at the critical point of a stable state and a destabilized state, the sliding friction force borne by the hole sealing material body is equal to the water injection thrust force. According to the stress analysis of the hole sealing material and the surrounding rock mass, the following characteristics are obtained:
the hole sealing material is subjected to friction force:
wherein: f. of0F is the similar model and the actual friction coefficient on site respectively;
σ0and sigma is respectively the similar model and the actual on-site confining pressure stress, unit: MPa;
D0d is the diameter of the similar model and the actual drilling hole on site, unit: mm;
L0l is the length of the similar model and the actual hole sealing on site, unit: mm;
the thrust of water injection on the end face of the hole sealing material is as follows:
wherein: p0P is respectively the similar model and the actual on-site water injection pressure, namely MPa;
the similar relation between the similar model and the actual water injection on site is as follows:
if the similar model is made by adopting the same coal sample on site and the same material is used for sealing holes, f0 is approximately considered to be equal to f;
then:
in the critical state:
namely:
therefore, the water injection pressure is similar as follows:
the friction force applied to the hole sealing material body is in a direct proportion relation with the hole sealing length and the pore size, and the experiment can be carried out according to geometric similarity conditions during laboratory simulation so as to achieve the same effect as the field.
2. Preparing a coal sample:
the method comprises the steps of taking a coal sample on site, testing main mechanical parameters of compression resistance, tensile resistance and shear resistance by using a mechanical testing machine, testing parameters of porosity and the like of the coal sample by using a mercury intrusion instrument and a nuclear magnetic resonance system, and taking the parameters as basic parameters for manufacturing the coal sample. The method comprises the steps of crushing and screening lump coal sampled on site by using a crusher, adding a certain proportion of adhesive, sand and the like to prepare a plurality of small samples with different proportions of phi 25mm multiplied by 60mm, testing parameters such as mechanical parameters, porosity and the like in the same way, adjusting the amount of the sand and the adhesive, adjusting the hardness and the porosity, selecting the proportion similar to the conditions of the coal sample on site, and preparing a large sample of the molded coal with the proportion of 400 multiplied by 4000 mm. As shown in figure 4, the briquette pressing equipment for manufacturing large briquette samples mainly comprises a die box 11, a peripheral supporting box body 3 and a pressurizing device 2. The peripheral supporting box body 3 is welded by adopting rectangular steel pipes to manufacture a frame structure. The die box 11 is made of a 50mm thick steel plate, the inner space size is 400 multiplied by 4000mm, the upper surface is open, and the die box 11 is placed in the peripheral supporting box body 3. The pressurizing device 2 adopts the existing pressurizing system to generate pressure, a jack piston rod is connected with a cover plate with the thickness of 50mm on the upper surface of the die box 11, and after similar materials are filled in the die box 11, the molded coal is formed through pressurizing and extruding.
3. Similar hole sealing test:
in the process of manufacturing the molded coal, the hole sealing sleeve with the selected size is pre-embedded in a similar material, and the sleeve is pulled out by a drilling machine after the pressed molded coal is finished to form a water injection hole 10 with the diameter D0And length L0, as shown in fig. 3. The two sides of the die box 11 are provided with vertical bar holes, the outer sides of the vertical bar holes are plugged by a flange water injection sleeve, the outer end of the water injection sleeve is connected with a water injection system, and a pressure detection unit and a flow detection unit are connected into the water injection system for detecting water injection pressure and water injection flow. The hole sealing device for sealing the water injection hole 10 is connected with the peripheral water injection unit by a flange. The hole sealing simulation system is shown in fig. 2 and 3. After the test system is connected, the pressurizing device generates confining pressure with the size sigma0And loading the water injection pump from 0.1MPa, increasing the water injection pressure by 0.1MPa every 1 minute until the water leakage in the hole is started, and recording the test pressure P (test) and the water leakage amount.
4. Inversion of the field actual hole sealing capability:
according to the test pressure P (test) obtained by the simulation test of similar hole sealing, according to the simulation similarity ratio
Inversion of the on-site actual hole sealing bearing capacity:
EXAMPLE 2
Referring to fig. 2 to 7, a similar simulation device for coal seam water injection and hole sealing tests comprises a molded coal pressing device and a water injection system, wherein the molded coal pressing device comprises a mold box 11, a peripheral supporting box body 3, a transfer beam 13 and a water injection pipe embedded in a molded coal sample 1, and the water injection pipe is used for forming a water injection hole 10 of the molded coal sample 1;
two ends of the die box 11 are provided with avoidance holes of the water injection pipe, and the avoidance holes are kidney-shaped holes; the top end of the mould box 11 is open, the transfer beam 13 is arranged at the open position of the mould box 11, and the mould box 11 is connected with the confining pressure pressurizing device 2 through the transfer beam 13; the peripheral supporting box body 3 is provided with a cavity matched with the circumferential direction of the mould box 11, and the mould box 11 is positioned in the cavity of the peripheral supporting box body 3;
the water injection system comprises a water inlet pipeline 4 and a water outlet pipeline 14 which are connected with two ends of the water injection hole 10, and the water inlet pipeline 4 and the water outlet pipeline 14 are fixed at two ends of the peripheral support box body 3; the water inlet pipeline 4 comprises a pump station 5 and a water tank 6 which are sequentially arranged along the fluid flowing direction; one end of the water outlet pipeline 14 is communicated with the water tank 6, and a pressure detection unit 7 and a flow detection unit 8 are arranged on the water outlet pipeline 14 which connects the water tank 6 and the peripheral supporting box body 3.
When the device is used, firstly, the molded coal in the mold box 11 is pressed into a molded coal sample 1 through the pressurizing device 2, secondly, a water injection pipe embedded in the molded coal sample 1 is pulled out, then, the molded coal sample is connected with a water injection system, a hole sealing piece 9 is placed in a water injection hole 10 of the molded coal sample 1, water is supplied and pressurized through the pump station 5, and the water injection pressure born by the hole sealing piece 9 is tested; the pressure detecting unit 7 and the flow rate detecting unit 8 are used for monitoring the water leakage amount and the water leakage pressure of the water filling hole 10.
The invention solves the technical problem of coal mine on-site hole sealing, and improves the water injection efficiency of the coal seam through effective hole sealing. By utilizing the simulation system, the on-site actual coal seam sealing capability can be inverted through a laboratory type coal seam sealing experiment, the sealing effect can be detected, and the working difficulty of a coal mine site is greatly reduced.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A similar simulation method for a coal seam water injection hole sealing test is characterized by comprising the following steps:
s1 determining experimental parameters: building a water injection hole sealing stress model according to the stress characteristics of the water injection hole sealing to obtain a simulation similarity ratio
Wherein, P0P is the similar model and the actual water injection pressure on site respectively, and the unit is MPa;
σ0and sigma is the similar model and the actual on-site confining pressure stress in unit MPa respectively;
D0d is the diameter of the similar model and the actual drilling hole on site respectively, and the unit is mm;
L0and L is the length of the similar model and the field actual hole sealing respectively, and the unit is mm;
determining experimental parameters and coal sample size specifications according to the thickness of the on-site coal bed and parameters influencing the similarity ratio, wherein the parameters influencing the similarity ratio refer to confining pressure stress, the diameter of a drill hole and the length of a hole sealing, and the experimental parameters refer to water injection pressure;
s2 coal sample preparation:
s2.1, preparing a small sample of the briquette: using an on-site coal sample, and manufacturing a small molded coal sample with a similarity rate of not less than 95% to the basic parameters of the on-site coal sample by adopting a charging processing mode, wherein the basic parameters refer to mechanical parameters and porosity parameters; the specification of the small briquette sample is easy to test the basic parameters;
s2.2, manufacturing a large sample of the briquette: manufacturing a large molded coal sample according to the component ratio of the small molded coal sample, and embedding a water injection pipe in the large molded coal sample, wherein the water injection pipe penetrates through the large molded coal sample; the specification of the large briquette sample is suitable for hole sealing experiments;
s3 similar pore sealing test:
applying similar model confining pressure sigma to large sample of molded coal0The water injection system starts to load from 0.1MPa and water injection pressure is 1 minute at intervalsIncreasing the force by 0.1MPa until the water leakage in the hole is started, stopping the test, and recording the actual water injection pressure P(test)And a water run out V;
s4 inversion of on-site actual hole sealing capability:
according to analog similarity ratio
And the actual water injection pressure P(test)And inversion of the actual hole sealing bearing capacity on site:
2. the similar simulation method for the coal seam water injection hole sealing test according to claim 1, characterized in that: the preparation method of the small briquette sample comprises the following steps:
s2.11, taking a site coal sample, and testing basic parameters of the site coal sample, wherein the basic parameters refer to mechanical parameters and porosity parameters, and the basic parameters are used as basic parameters for manufacturing the briquette coal sample;
s2.12, crushing the on-site coal sample, and adding the adhesives and the sands with different proportions to prepare a plurality of small samples with different component proportions;
s2.13 testing basic parameters of the small sample;
s2.14, selecting a small sample with the similarity rate of not less than 95% with the basic parameters of the on-site coal sample as a small briquette sample.
3. The similar simulation method of the coal seam water injection hole sealing test according to claim 2, characterized in that: and S2.11, testing the compression resistance, tensile resistance and shear resistance mechanical parameters by adopting a mechanical testing machine.
4. The similar simulation method of the coal seam water injection hole sealing test according to claim 2, characterized in that: and step S2.11, testing porosity parameters by adopting a mercury porosimeter and a nuclear magnetic resonance system.
5. The similar simulation method for the coal seam water injection hole sealing test according to claim 1, characterized in that: the method is applied to hole sealing simulation experiments of different hole sealing materials.
6. The method for simulating the hole sealing test of the coal seam water injection according to claim 5, wherein the method comprises the following steps: the method is applied to testing the maximum limit pressure and water leakage amount which can be born by different hole sealing processes.
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