Prediction method and evaluation device for sedimentation stability of suspension

Abstract

The invention relates to the technical field of suspension characteristic measurement, and provides a suspension settlement stability prediction method and an evaluation device.The suspension settlement stability prediction method comprises the following steps that initial settlement data, including pressure values G corresponding to different time points t, of a tested suspension in a preset time period are obtained through an inclination testing method; fitting a settlement prediction curve according to the initial settlement data; calculating a final pressure value G0 when the measured suspension is completely settled; and determining the final settlement time according to the settlement prediction curve and the final pressure value G0. The final settlement time is determined through settlement data collection in the preset time period and calculation of complete settlement data, the time for obtaining the final settlement time of the tested suspension is shortened, and the evaluation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension characteristic measurement, and in particular to a method for predicting the sedimentation stability of a suspension and an evaluation device. Background Art

[0002] The suspension stability of a suspension is an important performance indicator of the suspension. Currently, the commonly used methods for evaluating suspension stability are: (1) The glass rod method, in which the suspension is placed in an oven at a constant temperature and allowed to stand. When the set time comes, the aging tank is opened and the glass rod is freely dropped into the aging tank. If the sound of the glass rod touching the bottom can be heard, it indicates that the suspension has good suspension stability, otherwise it is poor. (2) The spectrophotometer method, in which a spectrophotometer is used to quantitatively test the stratification of the suspension. (3) The layered density measurement method, in which the suspension is placed in an oven at a constant temperature and allowed to stand. When the set time comes, the aging tank is opened and the density of each layer is measured and the density difference index is calculated. With the existing evaluation methods mentioned above, a single experimental evaluation takes several days and the evaluation efficiency is low.

[0003] The suspension stability evaluation of the suspension obtained by the above-mentioned existing evaluation device and method has the technical problems of long evaluation time and low efficiency. Summary of the invention

[0004] In order to solve one of the problems in the prior art, the present invention provides a method and an evaluation device for predicting the sedimentation stability of a suspension.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A method for predicting the sedimentation stability of a suspension comprises the following steps:

[0007] Obtaining initial sedimentation data of the tested suspension in a preset time period by a tilt test method, including pressure values ​​G corresponding to different time points t, and fitting a sedimentation prediction curve according to the initial sedimentation data;

[0008] Calculate the final pressure value G0 when the measured suspension is completely settled;

[0009] The final sedimentation time is determined according to the sedimentation prediction curve and the final pressure value G0.

[0010] The working principle and beneficial effects of the present invention are as follows: the final sedimentation time is determined by collecting sedimentation data of a preset time period and calculating the complete sedimentation data, which shortens the time for obtaining the final sedimentation time of the measured suspension and improves the evaluation efficiency.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the final pressure value G0 satisfies the following formula requirements:

[0013]

[0014] Among them, ρ is the density of the suspension, V is the volume of the test cylinder, g is the acceleration due to gravity, θ is the horizontal inclination angle of the test tube, m is the weight of the test tube, l is the distance from the support point to the bottom end of the test tube in the axial direction of the test tube, L is the total length of the test tube, and x is the distance from the center of gravity of the suspension in the axial direction of the test tube to the support point.

[0015] The beneficial effect of adopting the above further solution is that the final pressure value G0 is calculated according to the characteristic parameters of the suspension and the measuring device, ensuring the accuracy of the measurement.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Further, the distance x from the center of gravity of the suspension to the support point satisfies the following requirements:

[0018] When VSρ1 > V(1 - S)ρ2, it meets the requirements of formula (2).

[0019]

[0020] When VSρ1 < V(1 - S)ρ2, it meets the requirements of formula (3).

[0021]

[0022] Among them, VSρ1 is the mass of the solid phase of the suspension, V(1 - S)ρ2 is the mass of the liquid phase of the suspension, ρ1 is the density of the solid phase of the suspension, ρ2 is the density of the liquid phase of the suspension, S is the volume percentage of the solid phase content of the suspension, r is the inner radius of the test cylinder, and V is the volume of the test cylinder.

[0023] The beneficial effect of adopting the above further solution is that different models are set according to different types of measured suspensions to calculate the distance x from the center of gravity of the suspension in the axial direction of the test tube to the support point, improving the accuracy of the final prediction.

[0024] Based on the above technical solution, the present invention can also be improved as follows.

[0025] Further, the preset time period is between 18 hours and 24 hours, and the interval between adjacent time points t is between 1 minute and 60 minutes.

[0026] The beneficial effect of adopting the above further solution is that the entire test time is limited between 18 hours and 24 hours, and the time interval is set between 1 minute and 60 minutes. Under the premise of ensuring accurate prediction, the entire measurement takes a relatively short time.

[0027] Based on the above technical solution, the present invention can also be improved as follows.

[0028] Furthermore, the method for determining the final sedimentation time is that the time point corresponding to the final pressure value G0 on the sedimentation prediction curve is the final sedimentation time.

[0029] The beneficial effect of adopting the above further scheme is that the efficiency of determining the final settling time is improved by directly determining the final settling time from the settling prediction curve.

[0030] The present invention also provides a suspension sedimentation stability evaluation device, which is used to obtain the initial sedimentation data in the above suspension sedimentation stability prediction method, and includes: a test tube, a bracket and a force sensor;

[0031] The test tube is used to contain the suspension to be tested;

[0032] The bracket is rotatably connected to the upper part of the test tube through a clamping component;

[0033] The force sensor is arranged horizontally, and the bottom end of the test tube is placed at the center of the force sensor.

[0034] The beneficial effect of the evaluation device of the present invention is that the accuracy of obtaining the initial settlement data is ensured by horizontally arranging the force sensor.

[0035] Based on the above technical solution, the present invention can also be improved as follows.

[0036] Furthermore, a non-contact heating component is provided on the test tube.

[0037] The beneficial effect of adopting the above further scheme is: by providing a heating device, it is ensured that the stability state of the suspension under high temperature conditions can be simulated; at the same time, a non-contact heating method is adopted to avoid the heating component from exerting external force on the test tube.

[0038] Based on the above technical solution, the present invention can also be improved as follows.

[0039] Furthermore, the heating assembly is connected to the bracket via a damping shaft.

[0040] The beneficial effect of adopting the above further solution is that by providing a damping shaft, it is easy to adjust the position of the heating component to match the position of the test tube.

[0041] Based on the above technical solution, the present invention can also be improved as follows.

[0042] Furthermore, it also includes a vertical displacement adjustment mechanism for adjusting the upper and lower positions of the force sensor.

[0043] The beneficial effect of adopting the above further solution is that it is easy to adjust the angle of the test tube.

[0044] Based on the above technical solution, the present invention can also be improved as follows.

[0045] Furthermore, it also includes a horizontal displacement adjustment mechanism for adjusting the horizontal distance between the force sensor and the bracket.

[0046] The beneficial effect of adopting the above further solution is that it is easy to adjust in multiple directions to adapt to the test of the measuring tube simulating working conditions at different angles.

[0047] Based on the above technical solution, the present invention can also be improved as follows.

[0048] Furthermore, the measuring tube comprises a liquid storage body and an upper cover, and a recessed cavity is provided on the upper cover in a direction away from the liquid storage body.

[0049] The beneficial effect of adopting the above further solution is that by providing the recessed cavity, after the cover is installed, a certain cavity is present in the entire test tube, providing space for the tested suspension to expand during heating.

[0050] Based on the above technical solution, the present invention can also be improved as follows.

[0051] Furthermore, a pressure detection device is provided on the upper cover.

[0052] The beneficial effect of adopting the above further solution is that the experimental pressure can be obtained.

[0053] Based on the above technical solution, the present invention can also be improved as follows.

[0054] Furthermore, a pressure relief valve is provided on the upper cover.

[0055] The beneficial effect of adopting the above further solution is: the pressure in the test tube is adjusted by the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 1 is a flowchart of the first embodiment of the method for predicting the suspension stability of a suspension according to the present invention;

[0057] Figure 2 It is a diagram showing the principle that the solid mass in the suspension being tested is larger in the prediction method;

[0058] Figure 3 It is a schematic diagram showing the principle that the mass of the liquid phase in the suspension being tested is larger in the prediction method;

[0059] Figure 4 It is a three-dimensional structural diagram of the first embodiment of the suspension stability evaluation device of the present invention;

[0060] Figure 5 is a view in one direction of the first embodiment of the evaluation device;

[0061] Figure 6 is a cross-sectional view of the test tube in the first embodiment of the evaluation device;

[0062] Figure 7 It is a three-dimensional structural diagram of the second embodiment of the suspension stability evaluation device of the present invention;

[0063] Figure 8 is a view of the evaluation device embodiment 2 in one direction,

[0064] Fig. 9 It is the graph of the initial sedimentation pressure value of the first type of suspended liquid and the time point;

[0065] Fig.10 It is the first suspension liquid fitting-prediction line graph;

[0066] Fig.11 This is the graph of the initial sedimentation pressure value of the second suspension liquid versus time point;

[0067] Fig.12 This is the fitted-predicted line graph for the second suspension liquid.

[0068] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0069] 1. Bracket, 11. Clamping component, 12. Bearing, 2. Test tube, 21. Liquid storage body, 22. Upper cover, 23. Pressure relief valve, 24. Pressure detection device, 3. Force sensor, 4. Heating component, 41. Damping shaft, 42. Support adjustment mechanism, 51. Vertical displacement adjustment mechanism, 52. Horizontal displacement adjustment mechanism, 6. Mounting plate. DETAILED DESCRIPTION

[0070] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0071] The work flow chart of the embodiment 1 of the method for predicting the suspension stability of the suspension of the present invention is shown in Figure 1 .

[0072] A method for predicting the sedimentation stability of a suspension comprises the following steps.

[0073] The initial sedimentation data of the tested suspension in a preset time period are obtained by the shear test method, including the pressure value G corresponding to different time points t, and the sedimentation prediction curve is fitted according to the initial sedimentation data.

[0074] Calculate the final pressure value G0 when the tested suspension is completely settled.

[0075] Determine the final settlement time according to the settlement prediction curve and the final pressure value G0.

[0076] In this embodiment, the final pressure value G0 satisfies the following formula requirements:

[0077]

[0078] Where ρ is the density of the suspension, V is the volume of the test cylinder, g is the acceleration due to gravity, θ is the horizontal inclination angle of the test tube, m is the weight of the test tube, l is the distance from the support point to the bottom end of the test tube in the axial direction of the test tube, L is the total length of the test tube, and x is the distance from the center of gravity of the suspension in the axial direction of the test tube to the support point.

[0079] Among the foregoing parameters, except for x, the other parameters are the parameters of the measured suspension and the measuring device itself. For the distance x from the center of gravity of the suspension to the support point, different models are used for calculation according to the solid-liquid content of the measured suspension:

[0080] When VSρ1 > V(1 - S)ρ2, that is, the solid phase mass of the suspension is greater than the liquid phase mass of the suspension, meeting the requirements of formula (2).

[0081]

[0082] When VSρ1 < V(1 - S)ρ2, that is, the solid phase mass of the suspension is less than the liquid phase mass of the suspension, meeting the requirements of formula (3).

[0083]

[0084] Where VSρ1 is the mass of the solid phase of the suspension, V(1 - S)ρ2 is the mass of the liquid phase of the suspension, ρ1 is the density of the solid phase of the suspension, ρ2 is the density of the liquid phase of the suspension, S is the volume percentage of the solid phase content of the suspension, r is the inner radius of the test cylinder, and V is the volume of the test cylinder.

[0085] Specifically, for the schematic diagram of the principle with a larger volume fraction of the solid phase, see Figure 2 , the total length of the test tube is L, the horizontal inclination angle of the test tube is θ, the support point between the bracket and the test tube is A, the center of gravity of the test tube is B, the center of gravity after the suspension is completely settled is C, and the pressure sensor is horizontally placed to measure the pressure value of the test tube and the suspension; in this case, the center of gravity C of the suspension is located in the solid phase, and the distance x from the center of gravity of the suspension to the support point is calculated using formula (2).

[0086] For the schematic diagram of the principle with a larger volume fraction of the liquid phase, see Figure 3, the total length of the test tube is L, the horizontal inclination angle of the test tube is θ, the support point between the bracket and the test tube is A, the center of gravity of the test tube is B, the center of gravity of the suspension after complete sedimentation is C, and the pressure sensor is placed horizontally to measure the pressure value of the test tube and the suspension; in this case, the center of gravity C of the suspension is located in the liquid phase, and the distance x from the center of gravity of the suspension to the support point is calculated using formula (2).

[0087] Next, a specific suspension is selected to specifically illustrate the method of the present invention. First, a suspension in which the mass of the solid phase is greater than the mass of the liquid phase is selected to obtain initial sedimentation data.

[0088] The parameters of the test tube are: total length of the test tube L = 380 mm, weight of the test tube m = 4000 g, distance from the support point to the bottom of the test tube l = 240 mm, inclination angle of the test tube to the horizontal line θ = 45°, volume of the test cylinder V = 175 mL, inner radius of the test cylinder r = 14 mm, acceleration due to gravity g = 9.8 N / kg.

[0089] Parameters of the suspension: density is ρ=1.72 g / mL, density of the solid phase of the drilling and completion fluid is ρ1=3.4 g / mL, density of the liquid phase of the drilling and completion fluid is ρ2=1 g / mL, volume percentage (volume fraction) of the solid phase content of the drilling and completion fluid is S=0.3, and volume percentage (volume fraction) of the liquid phase content of the drilling and completion fluid is 0.7.

[0090] Substitute the above parameters into formula (2):

[0091]

[0092] Calculate x = 168.1 mm, and then substitute x into formula (1):

[0093]

[0094] Calculated G0 = 5.1157N, converted into gravity: 5.1157×102=521.8g.

[0095] Among them, in the conditions for obtaining the initial settlement data, the preset time period is 24 hours, and the interval between adjacent time points t is 60 minutes. The data obtained from the test are shown in the table below, and the pressure values ​​in the table below are also converted into gravity values.

[0096] Time (h) Pressure(N) Gravity (g) 1 4.2255 431 2 4.3627 445 3 4.4804 457 4 4.5294 462 5 4.5784 467 6 4.6176 471 7 4.6569 475 8 4.7059 480 9 4.7255 482 10 4.7549 485 11 4.7941 489 12 4.8235 492 13 4.8333 493 14 4.8529 495 15 4.8725 497 16 4.9020 500 17 4.8529 495 18 4.8824 498 19 4.9020 500 20 4.9314 503 21 4.9412 504 22 4.9412 504 23 4.9608 506 24 4.9804 508

[0097] The corresponding diagram of pressure value G and time point t drawn according to the initial settlement data is as follows Fig. 9 shown.

[0098] The settlement prediction curve is fitted according to the initial settlement data. The settlement prediction curve in this embodiment is fitted using the existing software Matlab. The data is imported into Matlab, and the data is fitted using "power approximation" to obtain the fitting curve shown in the figure. The equation of this curve is y=430.5x 0.05181 . y is the gravity value (unit: g), and x is the sedimentation time (unit: h).

[0099] According to this equation, the sedimentation time-gravity curve within 19 to 50 hours is plotted, and the obtained sedimentation is predicted within 24 to 50 hours. When y=521.8g, x=41h, and it is predicted that the drilling and completion fluid will be completely settled after 41 hours. That is, the time point corresponding to the final pressure value G0=521.8g on the sedimentation prediction curve is the final sedimentation time t=41h.

[0100] like Fig.10 The black dashed line in the middle is the fitting-prediction line, and the “*” points are the measured data within 0 to 24 hours.

[0101] In the embodiment of the present invention, the stability prediction method is verified by testing the two suspensions, and the test device and suspension used for verification are consistent with those described above.

[0102] For suspensions where the solid phase mass is greater than the liquid phase mass, the verification test data are shown in the following table.

[0103]

[0104]

[0105] As can be seen from the above-mentioned verification test result, the pressure value of the complete sedimentation of the suspension is 5.0568N, which is converted into a gravity value of 516g, and the corresponding sedimentation time is 39h. The final pressure value G0 corresponding to the prediction method and the test time are basically the same, showing that the prediction method has very high accuracy. The prediction time from the present embodiment is 24 hours, which is 39 hours with respect to the actual sedimentation time, saving nearly 40% of the time, greatly shortening the experimental time cycle, and improving efficiency.

[0106] Next, another specific suspension is selected to specifically illustrate the method of the present invention, that is, a suspension whose solid phase mass is less than the liquid phase mass is selected to obtain initial sedimentation data.

[0107] The test tube parameters are: total length of the test tube L = 380 mm, weight of the test tube m = 4000 g, distance from the support point to the bottom of the test tube l = 245 mm, inclination angle of the test tube to the horizontal line θ = 45°, volume of the test tube V = 175 mL, inner radius of the test tube r = 14 mm, acceleration due to gravity g = 9.8 N / kg.

[0108] Parameters of the suspension: the density of the drilling and completion fluid is ρ=1.33 g / mL, the density of the solid phase of the drilling and completion fluid is ρ1=4.3 g / mL, the density of the liquid phase of the drilling and completion fluid is ρ2=1 g / mL, the volume percentage (volume fraction) of the solid phase content of the drilling and completion fluid is S=0.1, and the volume percentage (volume fraction) of the liquid phase content of the drilling and completion fluid is 0.9.

[0109] Substitute the above parameters into formula (3):

[0110]

[0111] Calculate x = 101.9 mm, and then substitute x into formula (1)

[0112]

[0113] Calculated G0 = 4.8743N, converted into gravity: 4.8743×102 = 497.2g.

[0114] Among them, in the conditions for obtaining the initial settlement data, the preset time period is 18 hours, the interval between adjacent time points t is 60 minutes, and the data obtained from the test are shown in the table below.

[0115]

[0116]

[0117] The corresponding diagram of pressure value G and time point t drawn according to the initial settlement data is as follows Fig.11 shown.

[0118] The settlement prediction curve is fitted according to the initial settlement data. The settlement prediction curve in this embodiment is fitted using the existing software matlab. The data is imported into matlab, and the data is fitted using "power approximation" to obtain the fitting curve shown in the figure. The equation of this curve is y=417.9x 0.05334 . y is the gravity value (unit: g), and x is the sedimentation time (unit: h).

[0119] According to this equation, the sedimentation time-gravity curve within 30 hours is plotted, and the obtained is the prediction of the sedimentation within 19 to 30 hours. When y=497.2g, x=26h, and it is predicted that the drilling and completion fluid will be completely settled after 26 hours. That is, the time point corresponding to the final pressure value G0=497.2g on the sedimentation prediction curve is the final sedimentation time t=26h.

[0120] like Fig.12 The black dashed line in the middle is the fitting-prediction line, and the “*” points are the measured data within 0 to 18 hours.

[0121] In the embodiment of the present invention, the stability prediction method is verified by testing the two suspensions, and the test device and suspension used for verification are consistent with those described above.

[0122] For suspensions where the solid phase volume fraction is less than the liquid phase volume fraction, the verification test data are shown in the following table.

[0123] Time (h) Pressure(N) Gravity (g) 1 4.0572 414 2 4.2434 433 3 4.4002 449 4 4.4198 451 5 4.459 455 6 4.5374 463 7 4.5276 462 8 4.606 470 9 4.557 465 10 4.606 470 11 4.6746 477 12 4.6942 479 13 4.7334 483 14 4.6746 477 15 4.704 480 16 4.753 485 17 4.7726 487 18 4.7726 487 19 4.7628 486 20 4.7726 487 21 4.7628 486 22 4.7726 487 23 4.7922 489 24 4.7922 489

[0124] As can be seen from the above-mentioned verification test results, the pressure value of the complete sedimentation of the suspension is 4.7922N, which is converted into a gravity value of 489g, and its corresponding sedimentation time is 24h. The final pressure value G0 corresponding to the prediction method and the test time are basically the same, showing that the prediction method has very high accuracy. The prediction time from the present embodiment is 18 hours, which is 24 hours relative to the actual sedimentation time, saving nearly 25% of the time, greatly shortening the experimental time cycle, and improving efficiency.

[0125] In actual work, a deviation of 3-5 hours between the predicted time and the actual time for complete sedimentation of the suspension will not affect the application. Therefore, the above prediction method has high accuracy, can greatly shorten the experimental time cycle, and improve efficiency.

[0126] In the above embodiment, the interval between adjacent time points t is 60 minutes. In specific applications, the time interval can be shorter within the range of 1 to 60 minutes according to different scenarios and conditions.

[0127] The specific structure of the suspension sedimentation stability evaluation device embodiment 1 of this example can be found in Figures 4 to 6 , including: a test tube, a bracket and a force sensor; the test tube is used to contain the suspension to be tested; the bracket is rotatably connected to the upper part of the test tube through a clamping component; the force sensor is horizontally arranged, and the bottom end of the test tube is placed at the center of the force sensor.

[0128] The test tube consists of a liquid storage body, a base and an upper cover. The liquid storage body is screwed on the base. A recessed cavity is provided on the upper cover in a direction away from the liquid storage body. A pressure relief valve is provided on the upper cover.

[0129] The bracket is mounted on the mounting plate. In order to improve the stability of the bracket, the bracket is set as a triangular structure. A bearing is fixedly arranged on the top of the bracket. The clamping component is rotatably connected to the bearing through a rotating shaft. The upper part of the test tube is fixedly connected to the clamping component. A heating component is arranged in the middle of the test tube. The heating component does not physically contact the test tube and heats the test tube by radiant heat transfer. The upper part of the heating component is fixedly connected to the top of the bracket through a damping rotating shaft. The relative position between the heating component and the measuring tube is adjusted by the damping rotating shaft to ensure that the heating component does not contact the test tube.

[0130] The bottom of the test tube is placed at the center of the force sensor, and the force sensor is fixed on a movable platform, which is connected to the vertical displacement adjustment mechanism and the horizontal displacement adjustment mechanism.

[0131] When conducting a suspension stability test, first inject the suspension to be tested into the liquid storage body of the test tube, and tighten the upper cover. Place the upper part of the test tube into the clamping component and clamp it, place the bottom of the test tube at the center of the force sensor, and adjust the angle between the test tube and the horizontal plane through the vertical displacement adjustment mechanism and the horizontal displacement adjustment mechanism. After adjusting the angle, adjust the distance between the heating component and the test tube through the damping shaft to ensure that the heating component does not contact the test tube, and then test and record relevant data according to the set test plan.

[0132] In a specific embodiment, the pressure data of the force sensor can be recorded by automatic collection.

[0133] In a specific embodiment, in order to simulate the actual working conditions of the suspension, the suspension in the test tube can be heated to a set temperature. At the same time, a temperature sensor can be set in the test tube to accurately detect the temperature of the suspension in the tube. At the same time, by setting a concave cavity, after the cover is installed, the entire test tube has a certain cavity, which provides space for the tested suspension to expand when heated. In particular, when the pressure in the test tube is too high during the heating process, it is adjusted through the pressure relief valve.

[0134] The specific structure of the suspension sedimentation stability evaluation device embodiment 2 is shown in Figures 7 and 8 Compared with the first embodiment, the difference is that a pressure detection device is provided on the upper cover, and a support adjustment mechanism is provided between the bracket and the heating component. The pressure detection device is provided to accurately detect the pressure in the test tube. The support adjustment mechanism is provided to ensure that the position of the heating component remains accurate and reliable after adjustment.

[0135] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for predicting the sedimentation stability of a suspension, characterized in that: It includes the following steps: Obtain the initial sedimentation data of the measured suspension within a preset time period through an inclination test method, including the pressure value G corresponding to different time points t, and fit a sedimentation prediction curve based on the initial sedimentation data; Calculate the final pressure value G0 when the measured suspension is completely sedimented; Determine the final sedimentation time according to the sedimentation prediction curve and the final pressure value G0.

2. A method for predicting the sedimentation stability of a suspension according to claim 1, characterized in that: The final pressure value G0 meets the requirements of the following formula: Where ρ is the density of the suspension, V is the volume of the test cylinder, g is the acceleration due to gravity, θ is the horizontal inclination angle of the test tube, m is the weight of the test tube, l is the distance from the support point to the bottom end of the test tube in the axial direction of the test tube, L is the total length of the test tube, and x is the distance from the center of gravity of the suspension in the axial direction of the test tube to the support point.

3. A method for predicting the sedimentation stability of a suspension according to claim 2, characterized in that: The distance x from the center of gravity of the suspension to the support point meets the following requirements: When VSρ1 > V(1 - s)ρ2, it meets the requirements of formula (2). When VSρ1 < V(1 - S)ρ2, it meets the requirements of formula (3). Where VSρ1 is the mass of the solid phase of the suspension, V(1 - S)ρ2 is the mass of the liquid phase of the suspension, ρ1 is the density of the solid phase of the suspension, ρ2 is the density of the liquid phase of the suspension, S is the volume percentage of the solid phase content of the suspension, r is the inner radius of the test cylinder, and V is the volume of the test cylinder.

4. A method for predicting the sedimentation stability of a suspension according to claim 1, characterized in that: The preset time period is between 18 hours and 24 hours, and the interval between adjacent time points t is between 1 minute and 60 minutes.

5. A method for predicting the sedimentation stability of a suspension according to claim 1, characterized in that: The method for determining the final sedimentation time is that the time point corresponding to the final pressure value G0 on the sedimentation prediction curve is the final sedimentation time.

6. A device for evaluating the sedimentation stability of a suspension, characterized in that: Used to obtain the initial sedimentation data in the suspension sedimentation stability prediction method according to any one of claims 1 to 5, including: a test tube, a bracket, and a force sensor; The test tube is used to hold the measured suspension; The bracket is rotationally connected to the upper part of the test tube through a clamping component; The force sensor is horizontally arranged, and the bottom end of the test tube is placed at the center of the force sensor.

7. The device for evaluating the sedimentation stability of a suspension according to claim 6, characterized in that: A non-contact heating component is arranged on the test tube.

8. The device for evaluating the sedimentation stability of a suspension according to claim 7, characterized in that: The heating component is connected to the bracket through a damping rotating shaft.

9. The device for evaluating the sedimentation stability of a suspension according to claim 6, characterized in that: It further includes a vertical displacement adjustment mechanism for adjusting the up and down position of the force sensor.

10. The device for evaluating the sedimentation stability of a suspension according to claim 9, characterized in that: It further includes a horizontal displacement adjustment mechanism for adjusting the horizontal distance between the force sensor and the bracket.

11. The device for evaluating the sedimentation stability of a suspension according to any one of claims 6 to 10, characterized in that: The measuring tube includes a liquid storage main body and an upper cover, and a concave cavity is provided on the upper cover in a direction away from the liquid storage main body.

12. The device for evaluating the sedimentation stability of a suspension according to claim 11, characterized in that: A pressure detection device is provided on the upper cover.

13. The device for evaluating the sedimentation stability of a suspension according to claim 12, characterized in that: A pressure relief valve is provided on the upper cover.

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