CN110044671B - Coal rock sample for hydraulic fracturing experiment and manufacturing method thereof - Google Patents
Coal rock sample for hydraulic fracturing experiment and manufacturing method thereof Download PDFInfo
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- CN110044671B CN110044671B CN201910290193.1A CN201910290193A CN110044671B CN 110044671 B CN110044671 B CN 110044671B CN 201910290193 A CN201910290193 A CN 201910290193A CN 110044671 B CN110044671 B CN 110044671B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Abstract
The invention relates to a coal rock sample for a hydraulic fracturing experiment, which is a cube structure formed by layering and pressing coal powder and gangue powder, wherein: coal dust layer and coal gangue layer appear in turn, can adjust the thickness of coal dust layer and coal gangue layer according to experiment purpose and requirement, set up the round hole in the vertical downwards in coal petrography sample square top surface center, install the pipe nipple joint in the round hole, the evenly symmetric slot that distributes in pipe nipple joint bottom, the hole between pipe nipple joint and the round hole adopts sealed glue to fill, the pipe nipple joint firmly bonds together with the round hole, adapter is installed at pipe nipple joint top. The invention has wide application range and can be used for pressing coal and rock samples in cubes, cuboids, cylinders and other shapes; the principle is concise and clear, the operability is strong, the coal rock structure and physical property parameters can be accurately controlled, and the batch production is easy.
Description
Technical Field
The invention belongs to the field of oil and gas resource development, and particularly relates to a coal rock sample for a hydraulic fracturing experiment and a manufacturing method thereof.
Background
Coal bed gas is one of the main factors harming coal mining safety, and has been widely used as a clean energy source all over the world. Because coal rock occurring in the coal bed gas has the characteristics of thin thickness, low strength, joint development, alternate appearance of coal rock and coal gangue interlayers and the like, the technical challenge is brought to the exploitation of the coal bed gas by utilizing hydraulic fracturing. The research on the crack propagation rule and the control parameters thereof under the hydraulic fracturing condition by utilizing the indoor physical experiment is one of effective methods for determining and optimizing the coal bed gas hydraulic fracturing construction parameters and processes. However, the preparation of the coal rock sample used in the experimental process at present mainly has the following two problems.
(1) In order to reduce the influence of the model boundary effect on the experimental result, the size of the coal rock sample used in the actual indoor hydraulic fracturing object model experiment can generally reach 30cm × 30cm 3530 cm × 30cm (the length, the width and the height of a cube), and is even larger.
(2) The controllability of physical property parameters of the original rock sample is poor. When an indoor physical model experiment is carried out, a series of values are often required to be carried out on a certain physical property parameter of the coal rock so as to determine the influence of the parameter on the hydraulic fracturing fracture expansion rule, such as porosity, which is difficult to realize on a raw rock coal rock sample and influences the experiment effect. Meanwhile, a large number of coal gangue layers exist in an actual coal bed, great influence is also exerted on the expansion of the coal bed gas hydraulic fracturing crack, and the coal gangue layers are difficult to be contained in the sample during actual raw rock sampling.
Based on the above reasons, it is urgently needed to invent a coal rock sample for a hydraulic fracturing experiment and a manufacturing method thereof, so that the manufacturing difficulty of a large-size coal rock sample for the hydraulic fracturing experiment is reduced, the controllability of a coal rock structure and physical property parameters is realized, and the goodness of fit of an indoor physical model experiment result and an actual situation is improved.
Disclosure of Invention
Aiming at the technical problems of high acquisition difficulty of a large-size raw coal rock sample, uncontrollable coal rock structure and physical property parameters and the like in a coal bed gas hydraulic fracturing indoor physical model experiment, the invention provides the coal rock sample for the hydraulic fracturing experiment and the manufacturing method thereof, which can reduce the manufacturing cost of the coal rock sample for the hydraulic fracturing experiment, realize the controllability of the coal rock sample structure and the physical property parameters and meet the experiment requirements.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a coal petrography sample for hydraulic fracturing experiment, coal petrography sample are the square structure that is suppressed by buggy and coal gangue powder layering, wherein: coal dust layer and coal gangue layer appear in turn, can adjust the thickness of coal dust layer and coal gangue layer according to experiment purpose and requirement, set up the round hole in the vertical downwards in coal petrography sample square top surface center, install the pipe nipple joint in the round hole, the evenly symmetric slot that distributes in pipe nipple joint bottom, the hole between pipe nipple joint and the round hole adopts sealed glue to fill, the pipe nipple joint firmly bonds together with the round hole, adapter is installed at pipe nipple joint top.
The manufacturing method of the coal rock sample for the hydraulic fracturing experiment comprises the following steps:
(1) producing coal powder and coal gangue powder
(2) And manufacturing mold
(3) Pressing and drying coal and rock sample
(4) Drilling hole
(5) And installing the cylindrical short section and the adapter.
Compared with the prior art, the invention has the following beneficial effects: the application range is wide, and the pressing machine can be used for pressing coal and rock samples in cubes, cuboids, cylinders and other shapes; the principle is concise and clear, the operability is strong, the coal rock structure and physical property parameters can be accurately controlled, and the batch production is easy.
Drawings
FIG. 1 is a schematic representation of a coal rock sample for a hydraulic fracturing experiment;
FIG. 2 is an elevational, cross-sectional view of the adapter;
in the figure: 1. the device comprises a conversion joint, 2, a circular pipe short section, 3, sealant, 4, a circular hole, 5, a coal powder layer, 6, a coal gangue layer, 7 and a slot.
Detailed Description
As shown in fig. 1 and 2, the coal rock sample for the hydraulic fracturing experiment is a cube structure formed by layering and pressing coal powder and gangue powder, the coal powder layer and the gangue layer alternately appear, the length, the width and the height of the coal rock sample are both 30cm, the coal rock sample has five layers, the coal powder layer, the gangue powder layer and the coal powder layer are sequentially arranged from top to bottom, the thicknesses of the coal powder layer, the gangue powder layer, the coal powder layer, the gangue powder layer and the coal powder layer are respectively 9cm, 1.5cm, 9cm, 1.5cm and 9cm, the thicknesses of the coal powder layer and the gangue powder layer can be adjusted according to experiment purposes and requirements, and the particle sizes of the coal powder and the.
A round hole 4 is vertically formed downwards in the center of the top surface of the coal rock sample cube, the diameter of the round hole is 3cm, the depth of the round hole is 18cm, and the roughness of the wall of the round hole is 0.03 cm; a circular pipe nipple 2 is arranged in the circular hole 4, the outer diameter of the circular pipe nipple 2 is 2cm, the wall thickness is 2mm, the length is 17.5cm, and four cutting seams 7 with the width of 0.2mm and the length of 20mm are uniformly and symmetrically distributed at the bottom end of the circular pipe nipple 2; a 1cm gap is formed between the bottom of the round pipe nipple 2 and the bottom of the round hole 4, and the gap is filled with sand; the hole between the circular pipe short section 2 and the round hole is filled with sealant 3, and the circular pipe short section 2 and the round hole 4 are firmly bonded together.
The manufacturing method of the coal rock sample for the hydraulic fracturing experiment comprises the following steps:
(1) producing coal powder and coal gangue powder
Respectively selecting 50 kg of coal rock and gangue block bodies, and adjusting crushing parameters of a crusher to ensure that the diameters of crushed particles are mainly distributed between 50 and 70 meshes, so that the utilization rate of the crushed particles is improved; screening the crushed coal rock and coal gangue by using a screen with 70-mesh screen hole size, and reserving the part with the particle diameter of more than 70 meshes for secondary screening; sieving the particles with the size of the sieve mesh of 50 meshes obtained in the last screening process to obtain particles with the size of more than 70 meshes, and reserving the parts with the particle size of less than 50 meshes to obtain coal dust and coal gangue powder with the particle size of 50-70 meshes;
(2) and manufacturing mold
The method comprises the steps of assembling a rectangular solid die with the inner size of 30cm × 30cm × 32cm by utilizing a steel plate with the wall thickness of 2cm, wherein the die is 32cm in height, the deformation of the steel plate is not more than 0.01mm when the steel plate bears 100MPa, the die only comprises a bottom plate and four vertical wall panels, and is not provided with a top cover and used for filling coal rock and coal gangue particles into the die and applying a pressing load, and penetrating circular holes with the diameter of 2mm are distributed on the bottom plate and the four vertical wall panels of the die and used for draining water in the sample pressing process;
(3) pressing and drying coal and rock sample
S1, pressing the first coal rock stratum from bottom to top
Fully mixing coal rock particles with water, adding the mixture into a mold to a position 10cm high of a bottom plate of the mold, putting a loading plate, loading the mixture to 100MPa at a speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; repeating the process until the height of the pressed coal rock particles is about 9cm, and allowing an error of +/-0.5 cm;
s2, pressing the first coal gangue layer from bottom to top
Adding the coal gangue powder particles fully mixed with water to the position with the height of 12cm of the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; adjusting the amount of the mixture of the added coal gangue powder particles and water according to the thickness measurement value, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; repeating the process until the thickness height of the coal gangue powder layer is about 1.5cm, and allowing an error of +/-0.2 cm, wherein the total height of the sample is about 10.5 cm;
s3, pressing from bottom to top by a second coal seam
Adding coal rock particles fully mixed with water to a position 20.5cm higher than the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at a speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; the above process is repeated until the height of the pressed coal rock particles is about 9cm (tolerance of +/-0.5 cm), and the total height of the sample is about 19.5 cm;
s4, pressing a second coal gangue layer from bottom to top
Adding the coal gangue powder particles fully mixed with water to the position 22.5cm of the height of the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; adjusting the amount of the mixture of the added coal gangue powder particles and water according to the thickness measurement value, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; repeating the process until the thickness height of the coal gangue powder layer is about 1.5cm (tolerance of +/-0.2 cm), and the total height of the sample is about 21 cm;
s5, pressing from bottom to top by using third coal seam
Adding coal rock particles fully mixed with water to the position 31cm higher than the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; repeating the process until the height of the pressed coal rock particles is about 9cm (tolerance of +/-0.1 cm), and the total height of the sample is about 30 cm;
s6, demolding and drying the sample
And (3) after the sample is pressed, demolding, drying the sample in a drying box at the drying temperature of 105 ℃ for 24 hours, taking out the sample after drying is finished, weighing, sealing and reserving for subsequent experiments.
(4) Drilling hole
Vertically drilling a round hole with the diameter of 3cm and the depth of 18cm downwards at the center of the top surface of the pressed sample by using a fixed rhinestone, wherein the roughness of the hole wall is 0.03 cm; after the drilling is finished, putting the sample into a drying box for drying, wherein the drying temperature is 105 ℃, and the drying time is 24 hours; after drying, taking out the sample, sealing and reserving for subsequent experiments;
(5) mounting cylinder short section and adapter
Manufacturing a steel pipe short section with the length of 17.5cm and the outer diameter of 2cm, wherein the wall thickness of the steel pipe short section is 2mm, and four cutting seams are uniformly and symmetrically distributed at one end of the short section; the length of the cutting seam is 2cm, and the width of the cutting seam is 0.2 mm; the pipe openings of the slotting and slotting ends are blocked by cotton wool, so that the sealing glue can not be slotted and in the pipe; the other end of the round pipe nipple is provided with an upper adapter for connecting with a fracturing fluid injection pipe in the experiment process and injecting fracturing fluid; injecting quartz sand into the round hole, wherein the height is 1 cm; then injecting sealant into the round hole to the round hole opening, slowly inserting the round pipe short section into the round hole until the round pipe short section cannot be inserted, and ensuring that the central axis of the round pipe short section is coincident with the round hole; and (5) waiting for setting for 24 hours, polishing the sealant at the edge of the round hole to enable the sealant to be flush with the end face of the sample.
The coal rock sample for the hydraulic fracturing experiment is manufactured by using the original material of the coal bed gas reservoir, and has the advantages of simple principle, clear operation steps, strong operability and the like. Indoor experiments show that the mechanical similarity between the manufactured sample and actual original rock can reach more than 90% by adjusting related manufacturing parameters.
Claims (2)
1. The utility model provides a coal petrography sample for hydraulic fracturing experiment, coal petrography sample is the square structure that is formed by buggy and coal gangue powder layering suppression, its characterized in that: the coal powder layer and the coal gangue layer alternately appear, the thickness of the coal powder layer and the coal gangue layer can be adjusted according to experimental purposes and requirements, a round hole is vertically formed downwards in the center of the top surface of the coal rock sample cube, a circular pipe short section is installed in the round hole, cutting seams are uniformly and symmetrically distributed at the bottom end of the circular pipe short section, a hole between the circular pipe short section and the round hole is filled with sealant, the circular pipe short section and the round hole are firmly bonded together, and a conversion joint is installed at the top of the circular pipe short section;
the adapter adopts a step-shaped structure;
the length, the width and the height of each coal rock sample are 30cm, the coal rock samples have five layers which are a coal powder layer, a coal gangue powder layer, a coal gangue powder layer and a coal powder layer from top to bottom, the thicknesses of the coal powder layer, the coal gangue powder layer and the coal powder layer are respectively 9cm, 1.5cm, 9cm, 1.5cm and 9cm, and the diameters of coal powder particles and coal gangue powder particles are 50-70 meshes;
the diameter of the round hole is 3cm, the depth is 18cm, and the roughness of the wall of the round hole is 0.03 cm; the outer diameter of the circular pipe short section is 2cm, the wall thickness is 2mm, the length is 17.5cm, and four slots with the width of 0.2mm and the length of 20mm are uniformly and symmetrically distributed at the bottom end of the circular pipe short section; a1 cm gap is formed between the bottom of the round pipe nipple and the bottom of the round hole, and the gap is filled with sand.
2. The method for manufacturing the coal rock sample for the hydraulic fracturing experiment as claimed in claim 1, characterized by comprising the following steps:
(1) producing coal powder and coal gangue powder
(2) And manufacturing mold
(3) Pressing and drying coal and rock sample
(4) Drilling hole
(5) Installing a circular pipe short section and an adapter;
the step (1) is as follows: respectively selecting 50 kg of coal rock and gangue block bodies, and adjusting crushing parameters of a crusher to ensure that the diameters of crushed particles are mainly distributed between 50 and 70 meshes, so that the utilization rate of the crushed particles is improved; screening the crushed coal rock and coal gangue by using a screen with 70-mesh screen hole size, and reserving the part with the particle diameter of more than 70 meshes for secondary screening; sieving the particles with the size of the sieve mesh of 50 meshes obtained in the last screening process to obtain particles with the size of more than 70 meshes, and reserving the parts with the particle size of less than 50 meshes to obtain coal dust and coal gangue powder with the particle size of 50-70 meshes;
the method comprises the following specific steps that a steel plate with the wall thickness of 2cm is assembled into a cuboid die with the inner size of 30cm × 30cm × 32cm, wherein the height of the die is 32cm, the deformation of the steel plate is not more than 0.01mm when the steel plate bears 100MPa, the die only comprises a bottom plate and four vertical wall panels, and is not provided with a top cover and used for injecting coal rock and coal gangue particles into the die and applying pressing load, and penetrating circular holes with the diameter of 2mm are distributed on the bottom plate of the die and the four vertical wall panels and used for draining water in the sample pressing process;
the step (3) is specifically as follows:
s1, pressing the first coal rock stratum from bottom to top
Fully mixing coal rock particles with water, adding the mixture into a mold to a position 10cm high of a bottom plate of the mold, putting a loading plate, loading the mixture to 100MPa at a speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; repeating the process until the height of the pressed coal rock particles is about 9cm, and allowing an error of +/-0.5 cm;
s2, pressing the first coal gangue layer from bottom to top
Adding the coal gangue powder particles fully mixed with water to the position with the height of 12cm of the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; adjusting the amount of the mixture of the added coal gangue powder particles and water according to the thickness measurement value, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; repeating the process until the thickness height of the coal gangue powder layer is about 1.5cm, and allowing an error of +/-0.2 cm, wherein the total height of the sample is about 10.5 cm;
s3, pressing from bottom to top by a second coal seam
Adding coal rock particles fully mixed with water to a position 20.5cm higher than the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at a speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; repeating the process until the height of the pressed coal rock particles is about 9cm, and the total height of the sample is about 19.5 cm;
s4, pressing a second coal gangue layer from bottom to top
Adding the coal gangue powder particles fully mixed with water to the position 22.5cm of the height of the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; adjusting the amount of the mixture of the added coal gangue powder particles and water according to the thickness measurement value, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of a coal gangue powder layer; repeating the process until the thickness height of the coal gangue powder layer is about 1.5cm, and the total height of the sample is about 21 cm;
s5, pressing from bottom to top by using third coal seam
Adding coal rock particles fully mixed with water to the position 31cm higher than the mould, uniformly spreading the particles in the mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, unloading the load, taking the loading plate away, and measuring the height of the pressed coal rock particles; adjusting the amount of the fully-mixed coal rock particles and water added according to the height of the pressed coal rock particles, uniformly spreading the particles in a mould, putting a loading plate, loading to 100MPa at the speed of 0.001mm/s, maintaining the pressure for 24 hours, and measuring the height of the pressed coal rock particles; repeating the process until the height of the pressed coal rock particles is about 9cm, and the total height of the sample is about 30 cm;
s6, demolding and drying the sample
After the sample is pressed, demolding, putting the sample into a drying box for drying, setting the drying temperature at 105 ℃ for 24 hours, taking out the sample after drying is finished, weighing, sealing and reserving for subsequent experiments;
the step (4) is specifically as follows: vertically drilling a round hole with the diameter of 3cm and the depth of 18cm downwards at the center of the top surface of the pressed sample by using a fixed rhinestone, wherein the roughness of the hole wall is 0.03 cm; after the drilling is finished, putting the sample into a drying box for drying, wherein the drying temperature is 105 ℃, and the drying time is 24 hours; after drying, taking out the sample, sealing and reserving for subsequent experiments;
the step (5) is specifically as follows: manufacturing a circular pipe short section with the length of 17.5cm and the outer diameter of 2cm, wherein the wall thickness of the circular pipe short section is 2mm, and four cutting seams are uniformly and symmetrically distributed at one end of the short section; the length of the cutting seam is 2cm, and the width of the cutting seam is 0.2 mm; the pipe openings of the slotting and slotting ends are blocked by cotton wool, so that the sealing glue can not be slotted and in the pipe; the other end of the round pipe nipple is provided with an upper adapter for connecting with a fracturing fluid injection pipe in the experiment process and injecting fracturing fluid; injecting quartz sand into the round hole, wherein the height is 1 cm; then injecting sealant into the round hole to the round hole opening, slowly inserting the round pipe short section into the round hole until the round pipe short section cannot be inserted, and ensuring that the central axis of the round pipe short section is coincident with the round hole; and (5) waiting for setting for 24 hours, polishing the sealant at the edge of the round hole to enable the sealant to be flush with the end face of the sample.
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