Self-dissolving drag reducing agent for fracturing and preparation method thereof

Abstract

The present invention discloses a self-dissolving drag reducing agent for fracturing and a preparation method thereof, and relates to the technical field of drag reducing agents for fracturing fluids. The drag reducing agent components include polyacrylamide particles and a surface treatment agent with a hydrophilic function. The preparation method includes: S1, pretreatment of polyacrylamide particles: selecting high-purity polyacrylamide particles, screening them through a vibrating screen for standby use; S2, surface treatment agent selection: selecting a surface treatment agent with a hydrophilic function; S3, surface treatment: mixing the screened polyacrylamide particles with the surface treatment agent, and using high shear mixing, ultrasonic treatment or spraying methods to make the surface treatment agent fully contact with the particles; S4, drying: drying the polyacrylamide particles; S5, preparing drag reducing water: adding polyacrylamide particles to water, and forming drag reducing water after stirring; S6, testing: testing the rheological properties, solubility properties, and stability of the drag reducing water. The drag reducing agent can be quickly dissolved within 1 minute and evenly dispersed in water.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing fluid drag reducing agents, and in particular to a self-dissolving drag reducing agent for fracturing and a preparation method thereof. Background Art

[0002] In the process of preparing the drag reducing agent, it needs to undergo tests such as rheological properties, solubility, and stability. Only drag reducing agents with qualified quality can be used in fracturing technology. When conducting rheological property tests, the staff first pours polyacrylamide into a beaker filled with water, then stirs it with a stirrer for a period of time, and then transfers the beaker to a rotational viscometer to test the viscosity. The problem is that before stirring, the staff needs to manually adjust the height of the beaker or stirrer so that the stirrer contacts the liquid in the beaker; similarly, before conducting a viscosity test, the staff needs to manually adjust the height of the beaker or rotational viscometer so that the rotational viscometer contacts the liquid in the beaker. This manual reliance on methods results in low detection efficiency. Summary of the invention

[0003] To address the deficiencies of the prior art, the present invention provides a self-dissolving drag reducing agent for fracturing and a preparation method thereof, which can automatically move a beaker containing the drag reducing agent to the bottom of a rotary viscometer and automatically perform a viscosity test.

[0004] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0005] A self-dissolving drag reducing agent for fracturing comprises polyacrylamide particles and a surface treating agent with a hydrophilic function for changing the surface characteristics of the polyacrylamide particles.

[0006] Furthermore, the surface treatment agent is an organic compound containing one or more of hydroxyl, carboxyl and sulfonyl groups.

[0007] A method for preparing a self-dissolving drag reducing agent for fracturing comprises the following steps:

[0008] S1. Pretreatment of polyacrylamide particles: Select high-purity polyacrylamide particles and screen them through a vibrating screen for later use;

[0009] S2. Surface treatment agent selection: Select a surface treatment agent with hydrophilic function;

[0010] S3. Surface treatment: Mix the screened polyacrylamide particles with the surface treatment agent, and use high shear mixing, ultrasonic treatment or spraying method to make the surface treatment agent fully contact with the particles;

[0011] S4, drying: drying the surface-treated polyacrylamide particles;

[0012] S5, preparing resistance-reducing water: adding the dried polyacrylamide particles to water, and stirring to form resistance-reducing water;

[0013] S6. Testing: Testing the rheological properties, solubility and stability of the resistance-reducing water.

[0014] Further, in step S6, the rheological properties of the resistance-reducing water are detected by using a detection device, the detection device includes a detection platform, two loading platforms, a first power assembly and a second power assembly, two guide rails are arranged side by side on the top of the detection platform, a group of lifting mechanisms and a rotary viscometer located above the lifting mechanism are provided at one end of the detection platform, the first power assembly is used to move the loading platform along the corresponding guide rails, and to make the two loading platforms move alternately, the loading platform is provided with a through groove, a plurality of limit plates are provided on the outer periphery of the through groove, and a detection container is placed in the limit groove surrounded by the plurality of limit plates, the second power assembly is used to move the detection container on the loading platform to directly below the rotary viscometer, the lifting mechanism is used to pass through the through groove and lift the detection container, and the steps of detecting the rheological properties of the resistance-reducing water include:

[0015] A test container is placed on the loading platform, and the test container is filled with resistance-reducing water;

[0016] The two stages are moved alternately to the rotational viscometer by using the first power assembly. When one of the stages is moved to the rotational viscometer, the detection container on the stage is moved to the position directly below the rotational viscometer by using the second power assembly.

[0017] The lifting mechanism is used to pass through the through slot and lift the testing container so that the rotational viscometer contacts the resistance-reducing water;

[0018] Start the rotational viscometer to begin the test.

[0019] Furthermore, a guide groove penetrating the detection platform is provided on the outer side of each guide rail, and the guide groove is in a ship shape. The second power component includes a base plate and a roller. A first slide groove is provided at the bottom of the base plate, and two guide bars perpendicular to the guide rail are provided at the top. The guide rail slides in cooperation with the first slide groove. Two second slide grooves are provided at the bottom of the loading platform, and the guide bars slide in cooperation with the corresponding second slide grooves. The top of the roller is connected to the loading platform, and the roller slides in cooperation with the corresponding guide groove. A first avoidance groove is provided at one end of the base plate facing the roller for avoiding the roller. When step S6 detects the rheological properties of the resistance-reducing water, in the process of moving the loading platform to the rotational viscometer, the roller gradually moves to the end of the guide groove, thereby moving the loading platform along the guide bar and moving the detection container to directly below the rotational viscometer.

[0020] Furthermore, the lifting mechanism includes a lifting rod and a support plate. The movable end of the lifting rod passes through the test bench and is connected to the support plate. A second avoidance groove is provided at the end of the bottom plate away from the roller. When step S6 detects the rheological properties of the resistance-reducing water, when the test container is moved to directly below the rotational viscometer, the lifting rod is used to lift the support plate, and the test container is lifted after the support plate passes through the second avoidance groove and the through groove.

[0021] Furthermore, a strip groove penetrating the testing platform is provided on the inner side of each guide rail, and the first power assembly includes a motor, two pulleys and a belt. The two pulleys are rotatably arranged at the bottom of the testing platform, and the belt is sleeved on the two pulleys. The motor is arranged on the bracket, and its output shaft is connected to one of the pulleys. A connecting plate is provided at the bottom of the base plate, and the connecting plate is connected to the belt after passing through the corresponding strip groove. When step S6 detects the rheological properties of the resistance-reducing water, the motor drives the pulley, and the belt rotates to make the two loading platforms move alternately to the rotational viscometer.

[0022] Furthermore, another set of lifting mechanisms and an agitator located above the lifting mechanism are provided at the other end of the testing platform. When preparing the resistance-reducing water in step S5, the testing container is first placed on the stage, water and dried polyacrylamide particles are added to the testing container in turn, and then the motor is started to move the testing container to be stirred to the agitator. At the same time, another testing container to be tested is moved to the rotational viscometer, and the testing container is lifted by the lifting mechanism under the agitator so that the agitator contacts the liquid in the testing container to form the resistance-reducing water after stirring.

[0023] Furthermore, in step S4, drying is performed by air drying at room temperature, hot air drying or vacuum drying.

[0024] The beneficial effects of the present invention are:

[0025] 1. The drag reducing agent component contains a surface treatment agent, which has the function of improving hydrophilicity. It can selectively change the surface characteristics of polyacrylamide particles, improve the hydrophilicity of the particles, and promote the rapid dissolution of polyacrylamide particles within 1 minute, and evenly disperse in water to form drag reducing water for fracturing. It can effectively solve the problem that most of the current drag reducing agent powders have poor solubility and are prone to forming "fish eyes". At the same time, the use of self-dissolving polyacrylamide particle drag reducing agent can greatly reduce the amount of drag reducing agent used, has good salt and temperature resistance, does not require special mixing equipment, and greatly reduces the use cost of drag reducing agent during fracturing operations.

[0026] 2. In the method for preparing the drag reducing agent, the first power component automatically moves the two loading platforms to the rotary viscometer in an alternating manner, the second power component automatically moves the detection container on the loading platform to the bottom of the rotary viscometer, and the lifting mechanism automatically lifts the detection container to make the rotary viscometer contact the drag reducing water for testing. The whole process does not require manual adjustment of the equipment or the height of the detection container, which improves the detection efficiency.

[0027] 3. The structure is ingenious. Through a power source of the motor, the two loading platforms can be moved alternately to the rotational viscometer. In the process of the loading platforms moving to the rotational viscometer, the detection container can also be automatically moved to the bottom of the rotational viscometer, which greatly saves power sources and improves the overall detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the preparation method of an embodiment;

[0029] Figure 2 It is a structural diagram of the detection device of the embodiment;

[0030] Figure 3 The state of the two loading platforms on the detection platform of the embodiment Figure 1 ;

[0031] Figure 4 It is a structural diagram of the first power assembly at the bottom of the detection platform of the embodiment;

[0032] Figure 5 A structural diagram of the stage and the second power assembly of the embodiment;

[0033] Figure 6 is a structural diagram of the stage of an embodiment;

[0034] Figure 7 A bottom plate structure diagram of an embodiment;

[0035] Figure 8 A structural diagram of a detection device with an additional stirrer in the embodiment;

[0036] Fig. 9 The state of the two loading platforms on the detection platform of the embodiment Figure 2 ;

[0037] Fig.10 This is a diagram showing the test results of the drag reducing performance of the drag reducing agent of the embodiment;

[0038] Fig.11 This is a graph showing the rheological properties test results of the drag reducing agent of the embodiment. DETAILED DESCRIPTION

[0039] Example 1

[0040] This embodiment provides a self-dissolving drag reducing agent for fracturing, the components of which include polyacrylamide particles and a surface treatment agent.

[0041] The surface treatment agent has the function of improving hydrophilicity, such as organic compounds containing hydroxyl, carboxyl or sulfonic groups. The surface treatment agent can selectively change the surface properties of polyacrylamide particles, improve the hydrophilicity of the particles, and promote the dissolution of polyacrylamide particles in water.

[0042] Example 2

[0043] like Figure 1 As shown, this embodiment provides a method for preparing a self-dissolving drag reducing agent for fracturing, which is used to prepare the drag reducing agent in Example 1. The preparation method comprises the following steps:

[0044] S1. Pretreatment of polyacrylamide particles: Select high-purity polyacrylamide particles, screen them through a vibrating screen for later use, remove particles that are too large or too small, and ensure the consistency of particle size.

[0045] S2. Selection of surface treatment agent: Select a surface treatment agent with hydrophilic function, such as an organic compound containing hydroxyl, carboxyl or sulfonic groups.

[0046] S3. Surface treatment: Mix the screened polyacrylamide particles with the surface treatment agent, and use high shear mixing, ultrasonic treatment or spraying methods to make the surface treatment agent fully contact with the particles to change the surface properties of the particles.

[0047] S4, drying: drying the surface treated polyacrylamide particles to remove the residual solvent on the particle surface. Drying can be performed by air drying at room temperature, hot air drying or vacuum drying.

[0048] S5. Prepare resistance-reducing water: add the dried polyacrylamide particles to water, and use stirring or other methods to make the polyacrylamide particles quickly dissolve and evenly disperse in the water to form resistance-reducing water.

[0049] S6. Testing: Test the rheological properties, solubility and stability of the resistance-reducing water to ensure that its quality meets the use requirements. The test results are shown in Table 1, Table 2, Fig.10 and Fig.11 As shown in Table 1, whether it is clean water or return fluid, the particles can be quickly dissolved and evenly dispersed within 1 minute; as shown in Table 2, the drag reducing agent has good sand carrying performance, and the sand settling rate of the treated glue liquid is lower than that of the slippery water; Fig.10 It can be seen that the drag reduction performance of 1.0‰ self-dissolving drag reducing agent + clean water is significant; Fig.11 It can be seen that under the condition of continuous shearing for 120 minutes, the viscosity of 0.4% self-dissolving drag reducer + 0.4% cross-linking agent remains above 50mPa.s, which meets the industry requirements.

[0050] Table 1 is the dissolution performance test results of the self-dissolving drag reducing agent

[0051]

[0052] Table 2 is the test results of the sand carrying stability of the self-dissolving drag reducing agent

[0053]

[0054] More specifically, in the above step S6, the rheological properties of the resistance-reducing water are detected by a detection device, such as Figure 2 , Figure 6 As shown, the detection device includes a detection platform 1, two loading platforms 3, a first power assembly 5 and a second power assembly 6. Two guide rails 11 are arranged side by side on the top of the detection platform 1. One end of the detection platform 1 is provided with a group of lifting mechanisms 2 and a rotary viscometer 4 located above the lifting mechanisms 2. The first power assembly 5 is arranged on the detection platform 1. The first power assembly 5 is used to move the loading platforms 3 along the corresponding guide rails 11 and to move the two loading platforms 3 alternately to the rotary viscometer 4. The loading platforms 3 are provided with through grooves 32, and a plurality of limit plates are arranged on the periphery of the through grooves 32. 31, the limiting groove surrounded by multiple limiting plates 31 is used to place the detection container; the second power assembly 6 is connected to the stage 3, and when the stage 3 moves to the rotational viscometer 4, the second power assembly 6 is used to move the detection container on the stage 3 to directly below the rotational viscometer 4; when the stage 3 moves to directly below the rotational viscometer 4, the lifting mechanism 2 is located directly below the stage 3, and the lifting mechanism 2 is used to pass through the through groove 32 and lift the detection container, so that the rotational viscometer 4 can contact the resistance-reducing water in the detection container for testing.

[0055] The steps for testing the rheological properties of resistance-reducing water include:

[0056] A test container is placed on the stage 3, and the test container is filled with resistance-reducing water;

[0057] The first power assembly 5 is used to alternately move the two stages 3 to the rotational viscometer 4. When one of the stages 3 is moved to the rotational viscometer 4, the second power assembly 6 is used to move the detection container on the stage 3 to the position directly below the rotational viscometer 4.

[0058] The lifting mechanism 2 is used to pass through the through slot 32 and lift the detection container so that the rotational viscometer 4 contacts the resistance-reducing water;

[0059] The rotational viscometer 4 is started to start the test.

[0060] More specifically, Figure 2 , Figure 3 As shown, each guide rail 11 is provided with a guide groove 12 passing through the test platform 1 on the outside, and the guide groove 12 is in a boat shape, which means that the middle section of the guide groove 12 is parallel to the guide rail 11, and both ends of the guide groove 12 are also parallel to the guide rail 11, and the two ends of the guide groove 12 are closer to the guide rail 11 than the middle section, and the middle section of the guide groove 12 is inclined to transition to the end. Figure 2 , Figure 3 , Figure 5~Figure 7As shown, the second power assembly 6 includes a base plate 61 and a roller 62. A first slide groove 611 is provided at the bottom of the base plate 61. Two guide bars 612 perpendicular to the guide rail 11 are provided at the top of the base plate 61. The guide rail 11 slides in cooperation with the first slide groove 611. Two second slide grooves 33 are provided at the bottom of the loading platform 3. The guide bars 612 slide in cooperation with the corresponding second slide grooves 33. The top of the roller 62 is rotatably connected to the loading platform 3. The roller 62 slides in cooperation with the corresponding guide groove 12. A first avoidance groove 613 is provided at one end of the base plate 61 facing the roller 62. The first avoidance groove 613 is used to avoid the roller 62.

[0061] When the rheological properties of the resistance-reducing water are detected in step S6, the second power assembly 6 works as follows: in the process of using the first power assembly 5 to move the stage 3 to the rotational viscometer 4, the roller 62 gradually moves from the middle section of the guide groove 12 to the end of the guide groove 12. When the roller 62 moves along the guide groove 12, because the bottom plate 61 slides on the guide rail 11, the roller 62 will cause the stage 3 to move along the guide bar 612. When the roller 62 moves to the end of the guide groove 12, the detection container is just located under the rotational viscometer 4. At this time, the state of the stage 3 and the second power assembly 6 is as follows: Fig. 9 shown.

[0062] More specifically, Figure 2 , Figure 4 , Figure 7 , Fig. 9 As shown, the lifting mechanism 2 includes a lifting rod 21 and a support plate 22. The power source of the lifting rod 21 can be a cylinder, an oil cylinder or a hydraulic pressure. The lifting rod 21 is arranged below the test bench 1, and its movable end passes through the test bench 1 and is connected to the support plate 22. In order to facilitate the display of the position of the support plate 22, Fig. 9 No test container is placed on the stage 3. Note that the height of the support plate 22 when not raised should be lower than the bottom plate 61 to prevent interference with the moving track of the bottom plate 61. The end of the bottom plate 61 away from the roller 62 is provided with a second avoidance groove 614, which is used to avoid the support plate 22.

[0063] When the rheological properties of the resistance-reducing water are detected in step S6, the lifting mechanism 2 works as follows: when the detection container moves to the position directly below the rotational viscometer 4, the lifting rod 21 is used to lift the support plate 22, which passes through the second avoidance groove 614 and the through groove 32 in sequence, and then the detection container is lifted to make the rotational viscometer 4 contact the resistance-reducing water. Note that after the detection container is lifted, the detection container is still located in the limit groove to prevent the detection container from tipping over during the lifting or detection process, and to facilitate the detection container to be smoothly lowered to the original position after the detection is completed.

[0064] More specifically, Figure 2~Figure 4As shown, a strip groove 13 penetrating the detection platform 1 is provided on the inner side of each guide rail 11, and the first power assembly 5 includes a motor 51, two pulleys 52 and a belt 53. The two pulleys 52 are rotatably arranged at the bottom of the detection platform 1, and the belt 53 is sleeved on the two pulleys 52. The motor 51 is arranged on the bracket, and the output shaft of the motor 51 is connected to one of the pulleys 52. A connecting plate 615 is provided at the bottom of the bottom plate 61, and the connecting plate 615 passes through the corresponding strip groove 13 and is fixedly connected to the belt 53.

[0065] When the rheological properties of the drag-reducing water are detected in step S6, the first power assembly 5 works as follows: the motor 51 drives one of the pulleys 52, and the belt 53 causes the other pulley 52 to rotate synchronously, thereby causing the two loading platforms 3 to move in opposite directions and move alternately to the rotational viscometer 4.

[0066] In the above scheme, the specific steps of detecting the rheological properties of the resistance-reducing water include:

[0067] A test container is placed on the stage 3, and the test container is filled with resistance-reducing water;

[0068] The motor 51 drives the pulley 52, thereby causing the two stages 3 to move in opposite directions and move alternately to the rotational viscometer 4; when one of the stages 3 moves to the rotational viscometer 4, the roller 62 moves from the middle section of the guide groove 12 to the end of the guide groove 12, thereby causing the stage 3 to move along the guide strip 612, so that the detection container moves to be located directly below the rotational viscometer 4;

[0069] When the detection container moves to the position directly below the rotational viscometer 4, the lifting rod 21 is used to lift the support plate 22, and the support plate 22 passes through the second avoidance groove 614 and the through groove 32 in sequence, and then the detection container is lifted up, so that the rotational viscometer 4 contacts the resistance reducing water;

[0070] Start the rotational viscometer 4 to start the test;

[0071] After the test is completed, the support plate 22 descends to its original position; the motor 51 drives the pulley 52 in reverse to move the stage 3 away from the rotational viscometer 4 and move the other stage 3 to the rotational viscometer 4 at the same time.

[0072] In this embodiment, the two loading platforms 3 can be moved alternately to the rotational viscometer 4 through a power source of the motor 51. During the process of the loading platforms 3 moving to the rotational viscometer 4, the detection container can also be automatically moved to the bottom of the rotational viscometer 4, which greatly saves power sources and improves the overall detection efficiency.

[0073] As mentioned above, a lifting mechanism 2 and a rotational viscometer 4 are provided at one end of the test bench 1. In order to make full use of the test device, Figure 8As shown, in this embodiment, another set of lifting mechanism 2 and a stirrer 7 is provided at the other end of the testing platform 1 , and the stirrer 7 is mounted above its corresponding lifting mechanism 2 .

[0074] When preparing the resistance-reducing water in step S5, the detection device can be used to stir the detection container. The specific stirring method is as follows: first place the detection container in the limiting groove of the stage 3, and add water and dried polyacrylamide particles to the detection container in turn; start the motor 51 to move the detection container to be stirred to the stirrer 7, and at the same time, move another detection container to be tested to the rotational viscometer 4; use the lifting mechanism 2 under the stirrer 7 to lift the detection container so that the stirrer 7 contacts the liquid in the detection container, and the resistance-reducing water is formed after stirring.

[0075] The above embodiments are only used to illustrate the technical ideas and features of the present invention, and are not intended to be the only or limit the present invention. It should be understood by those skilled in the art that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a self-dissolving drag reducing agent for fracturing, wherein the drag reducing agent component comprises polyacrylamide particles and a surface treating agent having a hydrophilic function, wherein the surface treating agent is an organic compound containing one or more of a hydroxyl group, a carboxyl group, and a sulfonic group, characterized in that: The preparation method comprises the following steps: S1. Pretreatment of polyacrylamide particles: Select high-purity polyacrylamide particles and screen them through a vibrating screen for later use; S2. Surface treatment agent selection: Select a surface treatment agent with hydrophilic function; S3. Surface treatment: Mix the screened polyacrylamide particles with the surface treatment agent, and use high shear mixing, ultrasonic treatment or spraying method to make the surface treatment agent fully contact with the particles; S4, drying: drying the surface-treated polyacrylamide particles; S5, preparing resistance-reducing water: adding the dried polyacrylamide particles to water, and stirring to form resistance-reducing water; S6. Testing: Testing the rheological properties, solubility and stability of the resistance-reducing water; In step S6, the rheological properties of the resistance-reducing water are detected by using a detection device. The detection device comprises a detection platform (1), two loading platforms (3), a first power assembly (5) and a second power assembly (6). Two guide rails (11) are arranged side by side on the top of the detection platform (1). One end of the detection platform (1) is provided with a group of lifting mechanisms (2) and a rotary viscometer (4) located above the lifting mechanisms (2). The first power assembly (5) is used to move the loading platforms (3) along the corresponding guide rails (11) and to make the two loading platforms (3) move alternately. The loading platforms (3) are provided with a through groove (32). A plurality of limiting plates (31) are provided on the outer periphery of the through groove (32). A detection container is placed in the limiting groove surrounded by the plurality of limiting plates (31). The second power assembly (6) is used to move the detection container on the loading platform (3) to the position directly below the rotary viscometer (4). The lifting mechanism (2) is used to pass through the through groove (32) and lift the detection container. The steps of detecting the rheological properties of the resistance-reducing water include: A test container is placed on the loading platform (3), and the test container is filled with resistance-reducing water; The two loading platforms (3) are moved alternately to the rotational viscometer (4) by using a first power assembly (5); when one of the loading platforms (3) is moved to the rotational viscometer (4), the detection container on the loading platform (3) is moved to the position directly below the rotational viscometer (4) by using a second power assembly (6); The lifting mechanism (2) is used to pass through the through groove (32) and lift the detection container so that the rotational viscometer (4) contacts the resistance-reducing water; Start the rotational viscometer (4) to begin the test; Each guide rail (11) is provided with a guide groove (12) penetrating the detection platform (1) on the outside, and the guide groove (12) is in a ship shape. The second power assembly (6) comprises a bottom plate (61) and a roller (62). The bottom of the bottom plate (61) is provided with a first slide groove (611), and the top is provided with two guide bars (612) perpendicular to the guide rail (11). The guide rail (11) and the first slide groove (611) are slidably matched. The bottom of the loading platform (3) is provided with two second slide grooves (33), and the guide bars (612) and the corresponding second slide grooves (33) are slidably matched. The top of the test platform (62) is connected to the test platform (3), the roller (62) is slidably matched in the corresponding guide groove (12), and a first avoidance groove (613) is provided at one end of the bottom plate (61) facing the roller (62) for avoiding the roller (62). When the rheological properties of the resistance-reducing water are detected in step S6, during the process of the test platform (3) moving to the rotational viscometer (4), the roller (62) gradually moves to the end of the guide groove (12), thereby causing the test platform (3) to move along the guide strip (612) and causing the detection container to move to the position directly below the rotational viscometer (4).

2. The preparation method according to claim 1, characterized in that: The lifting mechanism (2) comprises a lifting rod (21) and a support plate (22). The movable end of the lifting rod (21) passes through the detection platform (1) and is connected to the support plate (22). The end of the bottom plate (61) away from the roller (62) is provided with a second avoidance groove (614). When the rheological properties of the resistance-reducing water are detected in step S6, when the detection container is moved to the position directly below the rotational viscometer (4), the lifting rod (21) is used to lift the support plate (22). The support plate (22) passes through the second avoidance groove (614) and the through groove (32) and then lifts the detection container.

3. The preparation method according to claim 1, characterized in that: Each guide rail (11) is provided with a strip groove (13) passing through the detection platform (1) on its inner side. The first power assembly (5) comprises a motor (51), two pulleys (52) and a belt (53). The two pulleys (52) are rotatably arranged at the bottom of the detection platform (1). The belt (53) is sleeved on the two pulleys (52). The motor (51) is arranged on a bracket, and its output shaft is connected to one of the pulleys (52). A connecting plate (615) is provided at the bottom of the bottom plate (61). The connecting plate (615) passes through the corresponding strip groove (13) and is connected to the belt (53). When the rheological properties of the resistance-reducing water are detected in step S6, the motor (51) drives the pulley (52), and the belt (53) rotates so that the two loading platforms (3) are moved alternately to the rotational viscometer (4).

4. The preparation method according to claim 3, characterized in that: Another set of lifting mechanisms (2) and a stirrer (7) located above the lifting mechanisms (2) are provided at the other end of the testing platform (1). When preparing the resistance-reducing water in step S5, the testing container is first placed on the stage (3), water and dried polyacrylamide particles are added to the testing container in sequence, and then the motor (51) is started to move the testing container to be stirred to the stirrer (7). At the same time, another testing container to be tested is moved to the rotational viscometer (4), and the testing container is lifted by the lifting mechanism (2) below the stirrer (7) so that the stirrer (7) contacts the liquid in the testing container, and the resistance-reducing water is formed after stirring.

5. The preparation method according to claim 1, characterized in that: In step S4, drying is performed by air drying at room temperature, hot air drying or vacuum drying.

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