Method and device for evaluating embedding depth of proppant

Abstract

The invention provides a method and device for evaluating the embedding depth of a proppant, and belongs to the technical field of oil and gas field development. Putting the rock disc into a reaction kettle, adjusting the reaction kettle, and simulating the rock disc condition under the real stratum condition; carbon dioxide fluids with different phase states are introduced into the reaction kettle, and different carbon dioxide fracturing technological processes are simulated for the rock disc; the rock disc is taken out of the reaction kettle, the rock disc and the proppant are placed in an online saturation device, and then the relation between the flow conductivity and the embedding depth of the proppant is established; and after the experiment is finished, the upper rock disc is taken out, and parameters related to the embedding depth of the propping agent are obtained. According to the device, the propping agent embedding process and the final embedding depth are monitored in real time, the propping agent embedding condition of a rock disc after fracturing of different carbon dioxide processes is obtained, meanwhile, the real-time change relation between the flow conductivity and the embedding depth is established, and an experimental platform is provided for research of propping agent embedding.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method and a device for evaluating the embedding depth of a proppant. Background Art

[0002] The application of carbon dioxide fracturing technology in many oil fields has increased year by year, but the adaptability of different carbon dioxide fracturing processes to reservoirs, reservoir damage, sand carrying capacity and laying effect are still lacking. After the injection of fracturing fluids with different water-carbon ratios, they react with reservoir rock minerals to cause rock hydration and softening, which causes proppant embedding and reduces the conductivity of artificial fractures, resulting in uneven production after fracturing, especially in reservoirs with soft rocks and strong water sensitivity. Therefore, it is urgent to study the changes in proppant embedding and conductivity and their influencing factors, so as to provide a basis for the optimization of proppant selection and fracturing process in fracturing construction.

[0003] Due to the effect of closing pressure, proppant will be embedded in the crack wall to varying degrees. If proppant is embedded in the crack wall, the effective crack width will be reduced, resulting in decreased conductivity. For soft rock formations, proppant embedding during fracturing will reduce the crack width after fracturing filling, and the formation debris in the embedded area will also damage the conductivity of the proppant filling layer. Therefore, it is necessary to study the embedding of proppant to provide a basis for the optimization of proppant in fracturing construction. The embedding of proppant occurs during the loss of fracturing fluid into the formation and continues as the closing pressure of the proppant filling layer increases. For rocks with different Young's modulus, the embedding of the same proppant will also have obvious differences. At this stage, due to insufficient understanding of rocks after fracturing by different carbon dioxide processes. Therefore, it is more practical to obtain the changes in proppant embedding depth and conductivity by simulating the embedding of proppant in rocks after fracturing by different carbon dioxide processes under formation conditions. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a method and device for evaluating the embedding depth of proppant. The technical problem to be solved by the present invention is how to monitor the embedding process and final embedding depth of proppant in real time, obtain the embedding status of proppant of the specimen after fracturing by different carbon dioxide processes, and establish the real-time changing relationship between conductivity and embedding depth, so as to provide an experimental platform for the research of proppant embedding.

[0005] In order to solve the above technical problems, the present invention provides a method for evaluating the embedding depth of a proppant, comprising the following steps:

[0006] Step S1: Processing the rock bed;

[0007] Step S2: placing the bedrock into the reactor and adjusting the reactor to simulate the bedrock conditions under real formation conditions;

[0008] Step S3: introducing carbon dioxide fluids of different phases into the reactor to simulate different carbon dioxide fracturing process flows on the rock bed;

[0009] Step S4: taking the rock bed out of the reactor, placing the rock bed and the proppant in an online saturation device, and then establishing a relationship between the conductivity and the embedding depth of the proppant;

[0010] Step S5: After the experiment is finished, the upper rock plate is removed to obtain parameters related to the embedding depth of the proppant.

[0011] Furthermore, in step S1, firstly, brine with the same mineralization as the formation conditions is prepared, and the bedrock is placed in the brine for soaking and saturation, thereby completing the treatment of the bedrock.

[0012] Furthermore, in step S2, the saturated rock bed is placed in a reactor, and the pore pressure and temperature of the reactor are set to simulate the rock conditions under real formation conditions.

[0013] Furthermore, in step S3, different carbon dioxide fracturing process flows include carbon dioxide dry fracturing, carbon dioxide pre-fracturing, carbon dioxide quasi-dry fracturing and carbon dioxide foam fracturing.

[0014] Furthermore, in step S4, the rock bed is taken out from the reactor and placed in an online saturation device, proppant is laid in the middle of the rock bed, closing pressure is applied, and carbon dioxide fluid is introduced into the diversion port for a certain period of time. The real-time curve of the relationship between the conductivity, proppant embedding depth and time is obtained in real time through the axial displacement traction meter, and the relationship between the conductivity and the proppant embedding depth is established.

[0015] Furthermore, in step S4, the calculation formula for the proppant embedding depth is:

[0016]

[0017] Where D is the embedding depth of the proppant; Z is the axial displacement, σ Z is the closing pressure; h is the thickness of the bedrock; E is the elastic modulus of the bedrock.

[0018] Furthermore, in step S4, the step of establishing the relationship between conductivity and proppant embedding depth is as follows:

[0019] The online saturation device can be used to obtain the propped fracture permeability, flow rate in the fracture, fluid viscosity, pressure difference at both ends of the test section and propped fracture width. The formula for calculating the conductivity is as follows:

[0020]

[0021] Where k is the propped fracture permeability; Q is the flow rate in the fracture; μ is the fluid viscosity; Δp is the pressure difference at both ends of the test section; W f is the actual support crack width;

[0022] At the same time, the width of the propped crack is related to the embedding depth of the proppant. The calculation formula of the width of the propped crack is:

[0023]

[0024] In the formula, is the average propped fracture width; H is the spacing from the rock bed; D is the embedding depth of the proppant;

[0025] The relationship between the average support crack width and the actual support crack width is established as follows:

[0026]

[0027] Where c is the coefficient between the average crack width and the actual crack width;

[0028] The established relationship between conductivity and proppant embedment depth is:

[0029]

[0030] Furthermore, in step S5, the parameters related to the embedding depth of the proppant include the embedding depth of the proppant at each point, the average embedding depth and the maximum embedding depth.

[0031] Furthermore, in step S5, after the experiment is finished, the upper rock plate is taken out, the liquid residue or proppant on the surface of the upper rock plate is washed away, and then a scanner is used to perform a 3D scan of the rock plate; data processing is performed through a computer control program to obtain parameters related to the embedding depth of the proppant.

[0032] Furthermore, in step S5, the upper rock plate is obtained by 3D scanning, a coordinate system is established on the upper rock plate plane, a reference plane is constructed, and the distance from each point on the pressure-embedded surface to the reference plane after the experiment is calculated to obtain the vertical height data z of each point on the pressure-embedded surface. ij By analyzing and processing the data, the average embedding depth and the maximum embedding depth can be obtained to evaluate the embedding depth of the proppant. The calculation formulas for the average embedding depth and the maximum embedding depth are as follows:

[0033]

[0034] Z range =Z max -Z min ;

[0035] In the formula, Z sais the average embedding depth; z ij is the embedding depth of each point; Z range is the maximum embedding depth; Z max is the maximum peak depth; Z min is the maximum valley depth; i is the row number where the data point is located; j is the column number where the data point is located.

[0036] The present invention provides a device for evaluating the embedding depth of a proppant, characterized in that the device utilizes the above-mentioned method for evaluating the embedding depth of a proppant, comprises a pump, a reaction kettle, a uniaxial compression system, an online saturation device and an axial displacement traction meter;

[0037] One end of the reactor is connected to an online saturation device, which contacts the uniaxial compression system above the online saturation device, an axial displacement traction meter is connected above the online saturation device, and the reactor, the uniaxial compression system and the online saturation device are respectively connected to a plurality of pumps.

[0038] Furthermore, the online saturation device includes a device body and a rock bed, and the rock bed is arranged inside the device body.

[0039] Furthermore, guide ports are provided on both sides of the device body, the rock bed includes an upper rock bed and a lower rock bed, sealing rings are provided on the outer sides of the upper rock bed and the lower rock bed, and the proppant is provided between the upper rock bed and the lower rock bed.

[0040] A method for evaluating the embedding depth of a proppant of the present invention can obtain the change of the conductivity with the embedding depth of the proppant by establishing a relationship between the conductivity and the embedding depth of the proppant, and can calculate the coefficient c in the relationship by measuring the conductivity and the embedding depth values ​​at N time points during the experiment, and can obtain the change trend of the coefficient c by fitting the coefficient c, and then obtain the real-time change relationship between the conductivity and the embedding depth, and finally can verify the relationship between the conductivity and the embedding depth by obtaining the result of the embedding depth through 3D scanning.

[0041] The present invention conducts uniaxial proppant embedding experiments on rocks and artificial specimens, monitors the proppant embedding process and the final embedding depth in real time, obtains the proppant embedding conditions of the specimens after different carbon dioxide fracturing processes, establishes the relationship between conductivity and embedding depth, and provides an experimental method and experimental platform for the study of proppant embedding. It can more realistically simulate the effect of carbon dioxide or water on rocks under formation conditions, resulting in the embedding of proppant, thereby causing loss of conductivity, and establish the relationship between conductivity and embedding depth. It can achieve real-time reflection of the proppant embedding conditions after different carbon dioxide fracturing processes under real formation conditions under the effective stress, and the measurement results are true and accurate. The method and device can be used to measure and calculate the depth of proppant embedding in rocks after different carbon dioxide fracturing processes, greatly reducing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic flow diagram of a method for evaluating the embedding depth of a proppant according to the present invention.

[0043] Figure 2 It is a schematic structural diagram of a device for evaluating the embedding depth of a proppant according to the present invention.

[0044] Figure 3 It is a schematic diagram of an online saturation device of a device for evaluating the embedding depth of a proppant according to the present invention.

[0045] Among them, 1-pump; 2-reactor; 3-uniaxial compression system; 4-online saturation device; 5-pressure gauge; 6-rock bed; 7-sealing ring; 8-flow guide port; 9-proppant; 10-axial displacement traction meter; 11-device body; 61, upper rock bed; 62, lower rock bed. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In order to better understand the purpose, structure and function of the present invention, a method and device for evaluating the embedding depth of a proppant of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] like Figure 1 As shown, a method for evaluating the embedding depth of a proppant according to the present invention comprises the following steps:

[0053] Step S1: Processing the rock bed 6;

[0054] Step S2: placing the bedrock 6 into the reactor, adjusting the reactor 2 to simulate the condition of the bedrock 6 under real stratum conditions;

[0055] Step S3: introducing carbon dioxide fluids of different phases into the reactor 2 to simulate different carbon dioxide fracturing process flows on the rock bed 6;

[0056] Step S4: taking the rock bed 6 out of the reactor 2, placing the rock bed 6 and the proppant 9 in the online saturation device 4, and then establishing the relationship between the conductivity and the embedding depth of the proppant;

[0057] Step S5: After the experiment is finished, the upper rock plate 61 is taken out to obtain parameters related to the embedding depth of the proppant.

[0058] Function 1 of step S5: a new method for accurately measuring the embedding depth is proposed; Function 2: the acquired data can verify the relationship between the flow conductivity and the embedding depth.

[0059] Embodiment 2:

[0060] like Figure 1 As shown, a method for evaluating the embedding depth of a proppant according to the present invention comprises the following steps:

[0061] Step S1: Processing the rock bed 6;

[0062] Step S2: placing the bedrock 6 into the reactor, adjusting the reactor 2 to simulate the condition of the bedrock 6 under real stratum conditions;

[0063] Step S3: introducing carbon dioxide fluids of different phases into the reactor 2 to simulate different carbon dioxide fracturing process flows on the rock bed 6;

[0064] Step S4: taking the rock bed 6 out of the reactor 2, placing the rock bed 6 and the proppant 9 in the online saturation device 4, and then establishing the relationship between the conductivity and the embedding depth of the proppant;

[0065] Step S5: After the experiment is finished, the upper rock plate 61 is taken out to obtain parameters related to the embedding depth of the proppant.

[0066] The difference between this embodiment and the first embodiment is that:

[0067] In step S1, firstly prepare a K-containing + , Ca 2+ 、Na + Ionized salt water is used to soak the bedrock until it is saturated, completing the bedrock treatment.

[0068] In step S2, the saturated rock bed is placed in a reactor, and the pore pressure and temperature of the reactor are set to simulate the rock conditions under real formation conditions.

[0069] In step S3, different carbon dioxide fracturing process flows include carbon dioxide dry fracturing, carbon dioxide pre-fracturing, carbon dioxide quasi-dry fracturing and carbon dioxide foam fracturing.

[0070] Carbon dioxide dry fracturing simulation: The specimen is placed in a reactor and supercritical carbon dioxide is introduced to control the saturation time.

[0071] Carbon dioxide pre-fracturing simulation: Place the specimen in a reactor and introduce supercritical carbon dioxide to control the saturation time. Then stop introducing carbon dioxide and inject distilled water into the container to control the saturation time.

[0072] Carbon dioxide quasi-dry fracturing simulation: introduce liquid carbon dioxide into the reactor, record the carbon dioxide flow rate, and control the saturation time. Then stop introducing carbon dioxide, inject distilled water into the container, and record the flow rate. When the volume of carbon dioxide and water is injected at different water-carbon ratios, control the saturation time.

[0073] Carbon dioxide foam fracturing simulation: Use a bubbler to obtain foamed carbon dioxide fluid in advance, pass the foamed carbon dioxide fluid into the reactor, and control the saturation time.

[0074] In step S4, the rock bed 6 is taken out from the reactor 2 and placed in the online saturation device 4, the proppant 9 is laid in the middle of the rock bed, the closing pressure is applied, and the carbon dioxide fluid is introduced into the diversion port 8 for a certain time. The real-time curve of the relationship between the conductivity, the embedding depth of the proppant and the time is obtained in real time through the axial displacement traction meter, and the relationship between the conductivity and the embedding depth of the proppant is established.

[0075] In step S4, the axial displacement of the rock bed 6 during the entire experiment can be obtained through the axial displacement traction meter 10. This axial displacement includes the embedding depth of the proppant 9 and the deformation of the rock bed 6. Therefore, the embedding depth of the proppant is equal to the total axial displacement minus the deformation of the rock bed. Therefore, the calculation formula of the embedding depth of the proppant is:

[0076]

[0077] Where d is the embedding depth of the proppant; Z is the axial displacement, σ Z is the closing pressure; h is the thickness of the rock plate; E is the elastic modulus of the rock plate.

[0078] In step S4, the steps of establishing the relationship between conductivity and proppant embedding depth are as follows:

[0079] The online saturation device can be used to obtain parameters such as propped fracture permeability, flow rate in fractures, fluid viscosity, pressure difference at both ends of the test section, propped fracture width, etc. The conductivity can be obtained by calculating the conductivity calculation formula. The calculation formula for conductivity is as follows:

[0080]

[0081] Where k is the propped fracture permeability; Q is the flow rate in the fracture; μ is the fluid viscosity; Δp is the pressure difference at both ends of the test section; W f is the actual support crack width.

[0082] At the same time, the width of the propped crack is related to the embedding depth of the proppant. The calculation formula of the width of the propped crack is:

[0083]

[0084] In the formula, is the average propped crack width; H is the starting spacing of the rock slab; D is the embedding depth of the proppant.

[0085] By introducing the coefficient c, the relationship between the average support crack width and the actual support crack width is established as follows:

[0086]

[0087] Where c is the coefficient of the relationship between the average crack width and the actual crack width. is the average support crack width; W f is the actual support crack width.

[0088] Furthermore, the established relationship between conductivity and proppant embedment depth is:

[0089]

[0090] Where c is the coefficient of the relationship between the average crack width and the actual crack width; k is the propped crack permeability; Q is the flow rate in the crack; μ is the fluid viscosity; Δp is the pressure difference at both ends of the test section; H is the spacing between the rock plates; and D is the embedding depth of the proppant.

[0091] By establishing the relationship between conductivity and proppant embedding depth, the change of conductivity with proppant embedding depth can be obtained. By measuring the conductivity and proppant embedding depth values ​​at N time points during the experiment, the coefficient c in the relationship can be calculated. The coefficient c is fitted to obtain the change trend of the coefficient c, and the real-time change relationship between conductivity and proppant embedding depth is obtained. Finally, the embedding depth result is obtained through 3D scanning to verify the relationship between conductivity and embedding depth.

[0092] In step S5, the parameters related to the embedding depth of the proppant include the embedding depth of the proppant at each point, the average embedding depth and the maximum embedding depth.

[0093] In step S5, after the experiment is finished, the upper rock plate 61 is taken out, the liquid residue or proppant on the surface of the upper rock plate 61 is washed away, and then a scanner is used to perform a 3D scan on the rock plate; data processing is performed through a computer control program to obtain parameters related to the embedding depth of the proppant.

[0094] In step S5, the upper rock plate 61 is acquired by 3D scanning, a coordinate system is established on the plane of the upper rock plate 61, a reference plane is constructed, and the distance from each point on the pressure-embedded surface to the reference plane after the experiment is calculated, thereby obtaining the vertical height data z of each point on the pressure-embedded surface. ij By analyzing and processing the data, we can obtain parameters such as the mean embedding depth, the maximum height difference, i.e. the maximum embedding depth, to evaluate the embedding depth of the proppant.

[0095]

[0096] Z range =Z max -Z min ;

[0097] In the formula, Z sa is the average embedding depth; z ij is the height of each point, that is, the embedding depth of each point; Z range is the maximum height difference, i.e. the maximum embedding depth; Z max is the maximum peak depth; Z min is the maximum valley depth; i is the row number where the data point is located; j is the column number where the data point is located.

[0098] Embodiment 3:

[0099] like Figure 2 As shown, a device for evaluating the embedding depth of a proppant according to the present invention, using the above-mentioned method for evaluating the embedding depth of a proppant, comprises a pump 1, a reactor 2, a uniaxial compression system 3, an online saturation device 4 and an axial displacement traction meter 10;

[0100] One end of the reactor 2 is connected to the online saturation device 4, and the upper part of the online saturation device 4 is in contact with the uniaxial compression system 3. The upper part of the online saturation device 4 is connected with an axial displacement traction meter 10. The reactor 2, the uniaxial compression system 3, and the online saturation device 4 are respectively connected to multiple pumps 1.

[0101] like Figure 3 As shown, the online saturation device 4 includes a device body 11 and a rock bed 6, and the rock bed 6 is arranged inside the device body 11;

[0102] The device body 11 is provided with flow guide ports 8 on both sides. The rock bed 6 includes an upper rock bed 61 and a lower rock bed 62 . Sealing rings 7 are provided on the outer sides of the upper rock bed 61 and the lower rock bed 62 . The proppant 9 is provided between the upper rock bed 61 and the lower rock bed 62 .

[0103] The use process of the device for evaluating the embedding depth of proppant of the present invention is as follows:

[0104] First, the rock bed is placed in the reactor 2, the valve behind the reactor 2 is closed, carbon dioxide fluids of different phases are introduced into the reactor 2, the temperature of the reactor 2 is adjusted, and the pressure is increased by pump 1 to simulate the condition of the rock bed 6 under real formation conditions, and different carbon dioxide fracturing process flows are simulated for the rock bed 6.

[0105] Secondly, the rock bed 6 is taken out from the reactor 2, and the rock bed 6 and the proppant 9 are placed in the online saturation device 4. The valve between the reactor 2 and the online saturation device 4 is opened, the reactor 2 is adjusted, and the phase and temperature of the fluid flowing from the reactor 2 into the online saturation device 4 are controlled. At the same time, the uniaxial compression system 3 is used to apply axial pressure. The axial displacement can be measured by the axial displacement traction meter 10. The axial displacement traction meter 10 can measure the conductivity and the proppant embedding depth, and then the relationship between the conductivity and the proppant embedding depth is established.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for evaluating the embedding depth of a proppant, characterized in that: The steps include: Step S1: Processing the rock bed; Step S2: placing the bedrock into the reactor and adjusting the reactor to simulate the bedrock conditions under real formation conditions; Step S3: introducing carbon dioxide fluids of different phases into the reactor to simulate different carbon dioxide fracturing process flows on the rock bed; Step S4: taking the rock bed out of the reactor, placing the rock bed and the proppant in an online saturation device, and then establishing a relationship between the conductivity and the embedding depth of the proppant; Step S5: After the experiment is finished, the upper rock plate is removed to obtain parameters related to the embedding depth of the proppant.

2. The method for evaluating proppant embedment depth according to claim 1, characterized in that: In step S1, firstly, brine with the same mineralization as the formation conditions is prepared, and the bedrock is placed in the brine for soaking and saturation, thereby completing the treatment of the bedrock.

3. The method for evaluating proppant embedment depth according to claim 2, characterized in that: In step S2, the saturated rock bed is placed in a reactor, and the pore pressure and temperature of the reactor are set to simulate the rock conditions under real formation conditions.

4. The method for evaluating proppant embedment depth according to claim 3, characterized in that: In step S3, different carbon dioxide fracturing process flows include carbon dioxide dry fracturing, carbon dioxide pre-fracturing, carbon dioxide quasi-dry fracturing and carbon dioxide foam fracturing.

5. The method for evaluating proppant embedment depth according to claim 4, characterized in that: In step S4, the rock bed is taken out from the reactor and placed in an online saturation device, proppant is laid in the middle of the rock bed, closing pressure is applied, and carbon dioxide fluid is introduced into the diversion port for a certain period of time. The real-time curve of the relationship between the conductivity, proppant embedding depth and time is obtained in real time through the axial displacement traction meter, and the relationship between the conductivity and the proppant embedding depth is established.

6. The method for evaluating proppant embedment depth according to claim 5, characterized in that: In step S4, the calculation formula for the proppant embedding depth is: Where D is the embedding depth of the proppant; Z is the axial displacement, σ Z is the closing pressure; h is the thickness of the bedrock; E is the elastic modulus of the bedrock.

7. The method for evaluating proppant embedment depth according to claim 6, characterized in that: In step S4, the steps of establishing the relationship between conductivity and proppant embedding depth are as follows: The online saturation device can be used to obtain the propped fracture permeability, flow rate in the fracture, fluid viscosity, pressure difference at both ends of the test section and propped fracture width. The formula for calculating the conductivity is as follows: Where k is the propped fracture permeability; Q is the flow rate in the fracture; μ is the fluid viscosity; Δp is the pressure difference at both ends of the test section; W f is the actual support crack width; At the same time, the width of the propped crack is related to the embedding depth of the proppant. The calculation formula of the width of the propped crack is: In the formula, is the average propped fracture width; H is the spacing from the rock bed; D is the embedding depth of the proppant; The relationship between the average support crack width and the actual support crack width is established as follows: Where c is the coefficient between the average crack width and the actual crack width; The established relationship between conductivity and proppant embedment depth is:

8. The method for evaluating proppant embedment depth according to claim 7, characterized in that: In step S5, the parameters related to the embedding depth of the proppant include the embedding depth of the proppant at each point, the average embedding depth and the maximum embedding depth.

9. The method for evaluating proppant embedment depth according to claim 8, characterized in that: In step S5, after the experiment is finished, the upper rock plate is taken out, the liquid residue or proppant on the surface of the upper rock plate is washed away, and then a scanner is used to perform a 3D scan on the rock plate; data processing is performed through a computer control program to obtain parameters related to the embedding depth of the proppant.

10. The method for evaluating proppant embedment depth according to claim 9, characterized in that: In step S5, the upper rock plate is acquired by 3D scanning, a coordinate system is established on the upper rock plate plane, a reference plane is constructed, and the distance from each point on the pressure-embedded surface to the reference plane after the experiment is calculated to obtain the vertical height data z of each point on the pressure-embedded surface. ij By analyzing and processing the data, the average embedding depth and the maximum embedding depth can be obtained to evaluate the embedding depth of the proppant. The calculation formulas for the average embedding depth and the maximum embedding depth are as follows: WITH range =Z max -WITH min ; In the formula, Z sa is the average embedding depth; z ij is the embedding depth of each point; Z range is the maximum embedding depth; Z max is the maximum peak depth; Z min is the maximum valley depth; i is the row number where the data point is located; j is the column number where the data point is located.

11. A device for evaluating the embedding depth of a proppant, characterized in that: A method for evaluating the embedding depth of a proppant using any one of claims 1 to 10, comprising a pump, a reactor, a uniaxial compression system, an online saturation device, and an axial displacement traction meter; One end of the reactor is connected to an online saturation device, which contacts the uniaxial compression system above the online saturation device, an axial displacement traction meter is connected above the online saturation device, and the reactor, the uniaxial compression system and the online saturation device are respectively connected to a plurality of pumps.

12. The device for evaluating proppant embedding depth according to claim 11, characterized in that: The online saturation device comprises a device body and a rock bed, wherein the rock bed is arranged inside the device body.

13. The device for evaluating proppant embedding depth according to claim 12, characterized in that: Both sides of the device body are provided with flow guide ports, the rock bed includes an upper rock bed and a lower rock bed, sealing rings are provided on the outer sides of the upper rock bed and the lower rock bed, and the proppant is provided between the upper rock bed and the lower rock bed.

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