CN114814094B - Visual experiment device and experiment method for simulating gas drilling and hole sealing - Google Patents
Visual experiment device and experiment method for simulating gas drilling and hole sealing Download PDFInfo
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- CN114814094B CN114814094B CN202210398113.6A CN202210398113A CN114814094B CN 114814094 B CN114814094 B CN 114814094B CN 202210398113 A CN202210398113 A CN 202210398113A CN 114814094 B CN114814094 B CN 114814094B
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- 238000005553 drilling Methods 0.000 title claims abstract description 67
- 238000002474 experimental method Methods 0.000 title claims abstract description 47
- 238000007789 sealing Methods 0.000 title claims abstract description 40
- 230000000007 visual effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 24
- 239000003245 coal Substances 0.000 claims abstract description 73
- 239000003566 sealing material Substances 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 239000012780 transparent material Substances 0.000 claims abstract description 12
- 238000004088 simulation Methods 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 10
- 238000007711 solidification Methods 0.000 claims abstract description 10
- 230000008023 solidification Effects 0.000 claims abstract description 10
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 230000035515 penetration Effects 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000011435 rock Substances 0.000 claims description 11
- 238000011068 loading method Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 240000008042 Zea mays Species 0.000 claims description 4
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 4
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 4
- 235000005822 corn Nutrition 0.000 claims description 4
- 235000012054 meals Nutrition 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000012615 aggregate Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 description 5
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- SXWZSWLBMCNOPC-UHFFFAOYSA-M potassium;6-methylheptanoate Chemical compound [K+].CC(C)CCCCC([O-])=O SXWZSWLBMCNOPC-UHFFFAOYSA-M 0.000 description 4
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- KVMPUXDNESXNOH-UHFFFAOYSA-N tris(1-chloropropan-2-yl) phosphate Chemical compound ClCC(C)OP(=O)(OC(C)CCl)OC(C)CCl KVMPUXDNESXNOH-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
Abstract
An experimental device and an experimental method for visual simulation of gas drilling and hole sealing, wherein the device comprises: the drilling simulation system comprises an experiment box body with at least one side surface made of transparent materials, wherein the experiment box body is filled with a filler for forming a simulated coal body; the grouting system comprises a grouting pump, a grouting pipe, a pressure gauge and a flow meter, wherein the grouting pump is connected to a drilling hole through the grouting pipe so as to inject slurry of the hole sealing material added with fluorescent powder into the drilling hole, and the pressure gauge and the flow meter are arranged on the grouting pipe and are used for monitoring the pressure and flow in the grouting pipe during grouting; and the visual observation system is used for recording the penetration and diffusion conditions of the slurry in the hole periphery cracks of the drill hole through images when the slurry of the hole sealing material is injected into the drill hole. The determined optimal technological parameters and the optimal proportioning of the hole sealing material are applied to grouting hole sealing of an actual gas extraction drill hole, so that the hole sealing material and a coal body form a whole after solidification, and the hole sealing material has good cohesiveness and high strength.
Description
Technical Field
The invention relates to the field of hole sealing material experimental devices, in particular to an experimental device and an experimental method for visually simulating gas drilling hole sealing.
Background
The high gas and low gas permeability mines in China are most, and the gas control problem is serious. Gas is an important factor threatening the safe production of coal mines, and the most critical measure for reducing the gas content is gas extraction. At present, most of mines in China have low gas extraction efficiency, and one key factor affecting the gas extraction efficiency is a hole sealing method. The hole sealing method is an important link of gas extraction, and if the hole sealing method is unreasonable, the gas extraction efficiency is low.
At present, the hole sealing method in China mainly comprises grouting hole sealing, wherein the flowing and penetrating conditions of grouting slurry in a coal seam cannot be observed visually during grouting hole sealing, so that proper grouting pressure or flow rate is difficult to determine, when the grouting pressure or flow rate is insufficient, grouting is difficult to penetrate into peripheral cracks (the peripheral cracks refer to peripheral cracks of a hole) and cannot seal the peripheral cracks of a drill hole, namely, a crack development area is not sealed, and air enters the drill hole through an air leakage channel, so that gas extraction efficiency is low.
Because the fluidity, viscosity, retarding time and the like of hole sealing materials of different materials are different, the penetration and expansion of the hole periphery cracks injected into the drill holes under different pressures and flows are also different, the prior art judges that the technological parameters of drilling grouting (the pressure, the flow and the time of grouting) generally depend on experience, namely, grouting slurry is considered to be full when the pressure of drilling grouting is unchanged, grouting is not needed, and the subjective judgment is not strict. Experimental guidance is lacking on how to determine the optimal process parameters for its injection, and how to determine the optimal pore sealing material. Therefore, there is a need for an experimental apparatus that simulates a downhole drilling environment, by which an optimal grouting process is determined, so as to guide the actual grouting construction in situ based on experimental data.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an experimental device and an experimental method for visually simulating gas drilling and hole sealing.
In order to achieve the above purpose, the invention provides an experimental device for visually simulating gas drilling and hole sealing, which comprises:
the drilling simulation system is used for simulating an underground drilling environment and comprises an experiment box body with at least one side surface made of transparent materials, wherein a filler for forming a simulated coal body is filled in the experiment box body, the top of the simulated coal body is in compression joint with a loading mechanism, and drilling holes are arranged in the filler;
the grouting system is used for simulating a downhole grouting process and comprises a grouting pump, a grouting pipe, a pressure gauge and a flow meter, wherein the grouting pump is connected to the drilling hole through the grouting pipe and used for injecting slurry of hole sealing materials added with fluorescent powder into the drilling hole, and the pressure gauge and the flow meter are arranged on the grouting pipe and used for monitoring pressure and flow in the grouting pipe during grouting; and
the visual observation system is used for recording the penetration and diffusion conditions of the slurry in the hole periphery cracks of the drill hole through images when the slurry of the hole sealing material is injected into the drill hole, and comprises a camera, wherein the focal point of the camera is opposite to one side surface of the experiment box body, which is provided with the transparent material.
As a further preferable technical scheme of the invention, the simulated coal body in the experimental box body comprises a gas storage space, a rock stratum and a coal seam which are sequentially arranged from top to bottom, and the loading mechanism is connected to the top of the gas storage space in a sealing manner through a steel plate; the drilling simulation system further comprises a temperature control device, and a heating device of the temperature control device is connected to the experiment box body and used for drying the newly paved simulated coal body in the experiment box body.
As a further preferable technical scheme of the invention, the length, width and height of the experimental box body are respectively 100cm, 20cm and 100cm, the height of the gas storage space is 20cm, the thickness of the rock stratum is 20cm, and the thickness of the coal seam is 60cm.
As a further preferable technical scheme of the invention, the rock stratum is formed by mixing river sand serving as aggregate and cement and water serving as cementing agents, wherein the weight ratio of the river sand to the cement to the water is 10:2:1.
As a further preferable technical scheme of the invention, the coal bed is formed by mixing pulverized coal, raw coal and corn meal, wherein the weight ratio of the pulverized coal to the raw coal is 2:8, and the particle size of the raw coal is 5mm.
As a further preferable technical scheme of the invention, the center position of the drilling hole is at the center of the coal seam, and the aperture phi of the drilling hole is 113mm.
As a further preferable technical scheme of the invention, the experimental box body is a box body with a sealed inner cavity, sealing pieces for sealing the inner cavity of the experimental box body are arranged at the periphery of the experimental box body, and the grouting pipe is in sealing connection with the opening of the drilling hole.
As a further preferable technical scheme of the invention, a plurality of cameras are arranged, and the cameras are simultaneously gathered on one side surface of the experiment box body, which is provided with transparent materials, at different visual angles so as to acquire image information at different angles.
As a further preferable technical scheme of the invention, the visual observation system further comprises an auxiliary light source and a computer, wherein the auxiliary light source is used for providing a light source to assist a camera to acquire images, and the computer is connected with the camera to acquire acquired image information and analyze and process the acquired image information.
According to another aspect of the present invention, the present invention also provides an experimental method using the experimental apparatus for visually simulating gas drilling and sealing, including the following steps:
1) Filling filler in an underground drilling environment in an experiment box body to form a simulated coal body, arranging a loading mechanism on the top surface of the simulated coal body, and drilling a drilling hole on the simulated coal body by adopting a drilling machine after the simulated coal body is dried;
2) The grouting pump is connected to the drilling hole in a sealing way through a grouting pipe, the input end of the grouting pump is connected with a slurry barrel for providing hole sealing materials through a grouting pipe, and a pressure gauge and a flowmeter are arranged on the grouting pipe;
3) Focusing a camera on one side surface of the experiment box body, which is provided with transparent materials;
4) Starting a grouting pump according to preset pressure and preset flow to perform grouting under pressure, acquiring image information of slurry permeated in the simulated coal body in the grouting process by a camera, and determining that grouting is completed when the slurry flows to the tip of an internal crack of the simulated coal body and cannot flow, otherwise, continuing grouting; after grouting is completed, the grouting pump is closed, and the time for grouting is recorded;
5) Repeating the steps 1) -4) with the same hole sealing material and by changing grouting pressure, flow rate and time, or with different hole sealing materials and by the same grouting pressure, flow rate and time, respectively, so as to collect image information of slurry permeation in the simulated coal body during grouting;
6) And (3) comprehensively comparing and analyzing the acquired image information to obtain the optimal pressure, flow and time of the hole sealing material in grouting or obtain the optimal ingredients and proportion of the hole sealing material.
According to the experimental device and the experimental method for visually simulating gas drilling and hole sealing, the following beneficial effects can be achieved by adopting the technical scheme:
1) The experimental device performs grouting with pressure on the holes of the simulated coal body in the built hole simulation system, and can accurately judge the time taken by the slurry to flow to the tip of the crack around the hole through the visual observation system, so as to determine optimal grouting process parameters such as grouting time, pressure and flow;
2) The experimental method can be applied to the assessment of the hole sealing quality of the hole sealing material so as to obtain the optimal raw material ratio, for example, the catalyst ratio in the hole sealing material influences the solidification time of the material, and the optimal ratio of the catalyst can be determined by visually observing the permeation change of grouting during grouting and repeatedly carrying out experiments by changing the raw material ratio of the hole sealing material.
3) The experimental device and the experimental method have the advantages that the hole sealing material with the optimal technological parameters and the optimal proportion is applied to grouting hole sealing of an actual gas extraction drilling hole, so that the hole sealing material is integrated with a coal body after solidification, the cohesiveness is good, the strength is high, the hole sealing material can block cracks after flowing to the tip of the cracks, shrinkage does not occur after solidification, crack repair can be realized, the hole sealing quality of the gas extraction drilling hole is improved, and the gas extraction efficiency is further improved.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of an example of the visual simulation of gas drilling and sealing experimental apparatus according to the present invention;
FIG. 2 is a schematic view of an example of the structure provided by the experimental box of the present invention;
FIG. 3 is an assembled schematic view of the visual inspection system of the present invention;
fig. 4 is a graph showing the solidification time of the sealing material after adjusting the proportion of the catalyst potassium iso-octoate in the sealing material.
In the figure: 1. the device comprises a computer, a camera, a pressure gauge, a flowmeter, a grouting pump, a grouting pipe, an experimental box body, a temperature control device, a drilling hole and an auxiliary light source, wherein the computer, the camera, the pressure gauge, the flowmeter, the grouting pump, the grouting pipe, the experimental box body and the auxiliary light source are arranged in sequence, and the experimental box body is provided with the temperature control device, the drilling hole and the auxiliary light source.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The invention will be further described with reference to the drawings and detailed description. The terms such as "upper", "lower", "left", "right", "middle" and "a" in the preferred embodiments are merely descriptive, but are not intended to limit the scope of the invention, as the relative relationship changes or modifications may be otherwise deemed to be within the scope of the invention without substantial modification to the technical context.
As shown in fig. 1-3, the invention provides an experimental device for visually simulating gas drilling and hole sealing, which comprises:
the drilling simulation system is used for simulating the environment of underground drilling 9 and comprises at least one experimental box body 7 with a transparent side surface, wherein the experimental box body 7 is filled with a filler for forming a simulated coal body, the top of the simulated coal body is in compression joint with a loading mechanism for simulating the underground stress state of the coal body in a coal mine, the filler is provided with a drilling 9 for simulating a gas extraction drilling 9, the experimental box body 7 with the transparent side surface is convenient for observing the penetration condition of slurry in the pores in the simulated coal body when grouting, and the simulated coal body in the experimental box body 7 comprises a gas storage space, a rock stratum and a coal bed which are sequentially arranged from top to bottom, and the loading mechanism is connected to the top of the gas storage space in a sealing manner through a steel plate; the drilling simulation system further comprises a temperature control device 8, wherein a heating device of the temperature control device 8 is connected to the experiment box 7 and is used for drying the newly paved simulated coal in the experiment box 7;
the grouting system is used for simulating a downhole grouting process and comprises a grouting pump 5, a grouting pipe 6, a pressure gauge 3 and a flow meter 4, wherein the grouting pump 5 is connected to the drilling hole 9 through the grouting pipe 6 so as to be used for injecting slurry of hole sealing materials added with fluorescent powder into the drilling hole 9, the pressure gauge 3 and the flow meter 4 are arranged on the grouting pipe 6 so as to be used for monitoring the pressure and flow in the grouting pipe 6 during grouting, and the fluorescent powder is added so as to be convenient for observing the flowing condition of the hole sealing materials in a coal body, is yellow-green and oily and does not react with high polymer materials (hole sealing materials);
the visual observation system is used for recording the penetration and diffusion condition of the slurry in the hole periphery cracks of the drill hole 9 through images when the slurry of the hole sealing material is injected into the drill hole 9, the visual observation system comprises a camera 2, the focus of the camera 2 is opposite to one side surface of the experiment box 7, which is provided with transparent materials, the visual observation system further comprises an auxiliary light source 10 and a computer 1, the auxiliary light source 10 is used for providing a light source for assisting the camera 2 in image acquisition, the auxiliary light source 10 irradiates from two sides, the acquired image information is prevented from being shaded and reflected as much as possible, and the computer 1 is connected with the camera 2 to acquire the acquired image information and analyze and process the acquired image information.
In a specific embodiment, the length, width and height of the experimental box 7 are 100cm, 20cm and 100cm respectively, the height of the gas storage space is 20cm, the thickness of the rock stratum is 20cm, the thickness of the coal seam is 60cm, the center of the drilling hole 9 is positioned at the center of the coal seam, and the aperture phi of the drilling hole 9 is 113mm. The rock stratum is formed by mixing river sand serving as aggregate and cement and water serving as cementing agents, wherein the weight ratio of the river sand to the cement to the water is 10:2:1; the coal bed is formed by mixing pulverized coal, raw coal and corn meal, wherein the weight ratio of the pulverized coal to the raw coal is 2:8, the particle size of the raw coal is 5mm, and the addition of the corn meal can ensure that the coal bed has good air permeability.
Preferably, the experiment box 7 is a box with a closed inner cavity, sealing elements for sealing the inner cavity of the experiment box 7 are arranged around the experiment box 7, and the grouting pipe 6 is in sealing connection with the opening of the drilling hole 9.
Further preferably, the number of cameras 2 is plural, and the plurality of cameras 2 are simultaneously gathered on a side surface of the experiment box 7 with transparent material at different viewing angles, so as to collect image information at different angles, obtain clearer and more visual dynamic images, and facilitate subsequent analysis.
The invention also provides an experimental method carried out by adopting the experimental device for visually simulating gas drilling hole sealing, which comprises the following steps:
1) Building a drilling simulation system: filling filler in the environment of the simulated underground drilling hole 9 in the experimental box 7 to form a simulated coal body, arranging a loading mechanism on the top surface of the simulated coal body, and drilling the drilling hole 9 on the simulated coal body by adopting a drilling machine after the simulated coal body is dried;
2) Grouting system connection: the grouting pump 5 is connected to a drilling hole 9 in a sealing way through a grouting pipe 6, the input end of the grouting pump 5 is connected with a slurry barrel for providing hole sealing materials through a grouting pipe, and a pressure gauge 3 and a flow meter 4 are arranged on the grouting pipe 6;
3) Visual observation system assembly: focusing the camera 2 on one side surface of the experiment box 7, which is provided with transparent materials;
4) The grouting pump 5 is started to perform grouting under pressure according to preset pressure and preset flow, the camera 2 collects image information of slurry permeation in the simulated coal body in the grouting process, when the slurry flows to the tip of an internal crack of the simulated coal body and cannot flow, the grouting is determined to be completed, otherwise, the grouting is continued; after grouting is completed, the grouting pump 5 is closed, and the time for grouting is recorded;
5) Repeating the steps 1) -4) with the same hole sealing material and by changing grouting pressure, flow rate and time, or with different hole sealing materials and by the same grouting pressure, flow rate and time, respectively, so as to collect the image information of slurry permeation in the simulated coal body during grouting, wherein different hole sealing materials are different according to different ingredients or different proportions;
6) And (3) comprehensively comparing and analyzing the acquired image information to obtain the optimal pressure, flow and time of the hole sealing material in grouting or obtain the optimal ingredients and proportion of the hole sealing material.
In the embodiment, the hole sealing material is prepared by mixing the following ingredients and proportions (as shown in table 1): polyether 305, polyether 204, flame retardant TCPP, stabilizer silicone oil, catalyst potassium isooctanoate and diphenylmethane diisocyanate (MDI). The preparation method comprises the following steps: firstly, polyether 305, polyether 204, flame retardant TCPP, stabilizer silicone oil and catalyst potassium isooctanoate are mixed according to proportion in a high-precision metering manner to obtain a mixture; and then adding diphenylmethane diisocyanate into the mixture to obtain slurry of the hole sealing material.
TABLE 1 raw material ratios of hole sealing materials
Experiments are carried out by using different hole sealing materials (the catalyst has different potassium isooctanoate content) and repeating the steps 1) -4 respectively through the same grouting pressure, flow rate and time, the solidification time of the materials can be regulated by regulating the proportion of the catalyst in the materials, and the hole sealing is carried out by regulating the solidification time of the materials to carry out hole sealing of the drilling holes 9, so that the diffusion time of the hole sealing materials in the coal rock mass is regulated and controlled. The setting time of the hole sealing material after the proportion is adjusted is shown in figure 4. The solidification time of the hole sealing material can be correspondingly regulated according to the length and the range of the hole Zhou Liexi of the hole 9, and the optimal catalyst content is determined through a plurality of groups of comparison experiments, and is optimal when the catalyst potassium isooctanoate content is 0.15%.
In another implementation, considering different grouting pressures and grouting times, in this embodiment, the following three sets of tests (each repetition of the above steps 1) to 4) are performed respectively, the grouting pressures set by the grouting pumps 5 of each set are 0.5, 1 and 1.5MPa, the grouting times are 30, 60 and 90s, and the pipeline is cleaned in time after a set of experiments are performed, so as to avoid the residual liquid from coagulating and blocking the pipeline. Finally, the acquired image information is compared to determine optimal pressure, flow and time parameters.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (8)
1. The experimental method of the experimental device for visually simulating gas drilling and sealing is characterized in that the experimental device for visually simulating gas drilling and sealing comprises the following steps:
the drilling simulation system is used for simulating an underground drilling environment and comprises an experiment box body with at least one side surface made of transparent materials, wherein a filler for forming a simulated coal body is filled in the experiment box body, the top of the simulated coal body is in compression joint with a loading mechanism, a drilling hole is arranged in the filler, the simulated coal body in the experiment box body comprises a gas storage space, a rock stratum and a coal bed which are sequentially arranged from top to bottom, the coal bed is formed by mixing pulverized coal, raw coal and corn meal, the weight ratio of the pulverized coal to the raw coal is 2:8, and the particle size of the raw coal is 5mm;
the grouting system is used for simulating a downhole grouting process and comprises a grouting pump, a grouting pipe, a pressure gauge and a flow meter, wherein the grouting pump is connected to the drilling hole through the grouting pipe and used for injecting slurry of hole sealing materials added with fluorescent powder into the drilling hole, and the pressure gauge and the flow meter are arranged on the grouting pipe and used for monitoring pressure and flow in the grouting pipe during grouting; and
the visual observation system is used for recording the penetration and diffusion conditions of the slurry in the hole periphery cracks of the drill hole through images when the slurry of the hole sealing material is injected into the drill hole, and comprises a camera, wherein the focal point of the camera is opposite to one side surface with the transparent material on the experimental box body;
the experimental method comprises the following steps:
1) Filling filler in an underground drilling environment in an experiment box body to form a simulated coal body, arranging a loading mechanism on the top surface of the simulated coal body, and drilling a drilling hole on the simulated coal body by adopting a drilling machine after the simulated coal body is dried;
2) The grouting pump is connected to the drilling hole in a sealing way through a grouting pipe, the input end of the grouting pump is connected with a slurry barrel for providing hole sealing materials through a grouting pipe, and a pressure gauge and a flowmeter are arranged on the grouting pipe;
3) Focusing a camera on one side surface of the experiment box body, which is provided with transparent materials;
4) Starting a grouting pump according to preset pressure and preset flow to perform grouting under pressure, acquiring image information of slurry permeated in the simulated coal body in the grouting process by a camera, and determining that grouting is completed when the slurry flows to the tip of an internal crack of the simulated coal body and cannot flow, otherwise, continuing grouting; after grouting is completed, the grouting pump is closed, and the time for grouting is recorded;
5) Repeating the steps 1) -4) with the same hole sealing materials by changing grouting pressure, flow and time to perform experiments so as to collect image information of slurry permeation in a simulated coal body during grouting;
6) Comprehensively comparing and analyzing the acquired image information to obtain the optimal pressure, flow and time of the hole sealing material in grouting; and (3) carrying out experiments by using different hole sealing materials and respectively repeating the steps 1) -4) through the same grouting pressure, flow and time, adjusting the solidification time of the hole sealing materials by adjusting the proportion of the catalyst in the hole sealing materials, and carrying out hole drilling and hole sealing by adjusting the solidification time of the hole sealing materials, so that the diffusion time of the hole sealing materials in a coal rock mass is regulated and controlled, and the optimal catalyst content is determined through a plurality of groups of comparison experiments.
2. The method according to claim 1, wherein the loading mechanism is sealingly engaged to the top of the gas storage space by a steel plate; the drilling simulation system further comprises a temperature control device, and a heating device of the temperature control device is connected to the experiment box body and used for drying the newly paved simulated coal body in the experiment box body.
3. The method of claim 2, wherein the test box has a length, width and height of 100cm, 20cm and 100cm, the gas storage space has a height of 20cm, the rock layer has a thickness of 20cm, and the coal layer has a thickness of 60cm.
4. The method according to claim 2, wherein the rock layer is formed by mixing river sand as aggregate and cement and water as cementing agent, and the weight ratio of the river sand to the cement to the water is 10:2:1.
5. The method of claim 2, wherein the borehole is centered in the coal seam and has a bore diameter of 113 a mm a.
6. The method according to claim 1, wherein the experimental box is a box with a closed inner cavity, sealing elements for sealing the inner cavity are arranged around the experimental box, and the grouting pipe is in sealing connection with the hole of the drilling hole.
7. The method according to claim 1, wherein the plurality of cameras are gathered on a side surface of the experiment box body, which is made of transparent material, at different angles of view, so as to collect image information at different angles.
8. The method of claim 1, wherein the visual observation system further comprises an auxiliary light source for providing a light source to assist the camera in image acquisition and a computer connected to the camera for acquiring the acquired image information and analyzing the acquired image information.
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| CN202210398113.6A CN114814094B (en) | 2022-04-13 | 2022-04-13 | Visual experiment device and experiment method for simulating gas drilling and hole sealing |
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| CN202210398113.6A CN114814094B (en) | 2022-04-13 | 2022-04-13 | Visual experiment device and experiment method for simulating gas drilling and hole sealing |
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| CN114814094B true CN114814094B (en) | 2024-03-01 |
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