Laboratory B-PPG gel particle injection system and method

Abstract

The invention discloses a laboratory B-PPG gel particle injection system and method, and relates to the technical field of oil field development physical simulation experiments. According to the technical scheme, the polymer mother liquor containing B-PPG gel particles can be in a rotating state in the injection process, the suspension time of the B-PPG gel particles is prolonged, the integrity of the B-PPG gel particles is kept, and therefore the effect of an indoor B-PPG gel particle development effect simulation experiment is improved. The system comprises a pressure source, a valve and a B-PPG gel particle injection device, two ends of the valve are respectively communicated with a pressure source and an injection device; the injection device comprises a shell, a rotary piston container, a driving motor, a gear mechanism and a control unit; the rotary piston container is positioned on the side of the shell; the driving motor and the gear mechanism are arranged in the shell; the driving motor is connected with the rotary piston container through a gear mechanism; the control unit is in communication connection with the driving motor; the control unit can control the driving motor to alternately rotate forwards and backwards within a preset time range. The invention further provides an injection method based on the injection system.

Description

Technical Field

[0001] The present application relates to the technical field of physical simulation experiments for oilfield development, and in particular to a laboratory B-PPG gel particle injection system and method. Background Art

[0002] Reservoir characteristics after polymer flooding become significantly more complex, primarily manifesting in increased reservoir heterogeneity, patchy and unpredictable distribution of remaining oil, increased losses and formation damage due to polymer retention in porous media, and reduced formation permeability caused by plugging agents. These characteristics collectively affect the flow path of injected water during subsequent water flooding, leading to frequent fingering and difficulty reaching low-permeability layers or dead zones, further complicating enhanced oil recovery. Therefore, to meet growing energy demands, more advanced and effective technical measures must be adopted to address the complex characteristics of reservoirs after polymer flooding.

[0003] To address these challenges, B-PPG gel particles were successfully developed. These particles, with their unique partially cross-linked, partially branched molecular structure, demonstrate exceptional plugging capabilities and adaptability. They not only effectively block large pores, reducing ineffective fluid circulation within these channels, but also broaden the reach of medium- and low-permeability reservoirs, enabling more crude oil to be displaced. This significantly improves oil recovery efficiency and further enhances oil recovery in oilfields following polymer flooding.

[0004] The unique structure and properties of B-PPG gel particles contribute to their crucial role in oilfield development. They combine the advantages of partially hydrolyzed polyacrylamide and cross-linked polymer gels, offering the viscosity-enhancing and formation migration capabilities of linear polymer solutions with the temperature, salt, aging, and formation permeability control capabilities of cross-linked polymer gels. This unique combination enables B-PPG gel particles to dynamically adjust and block shifting streamlines in porous media, further expanding the swept volume of fluid flow and thus improving oilfield recovery efficiency. Furthermore, the branched, pre-cross-linked structure of B-PPG gel particles provides them with high strength, low expansion, and easy deformation. During formation flooding, they exhibit a flow pattern of plugging-migration-re-plugging-re-migration. These properties make B-PPG gel particles particularly suitable for enhanced oil recovery in high-temperature, medium- and low-permeability reservoirs. Furthermore, B-PPG's stable chemical structure and excellent temperature and salt resistance allow the system to maintain optimal viscosity even after long-term aging, meeting the needs of improving reservoir sweep efficiency and mobility control. Therefore, compared with conventional polymers and gels, the B-PPG system has significant advantages in improving the recovery rate of high-temperature and high-salinity reservoirs, providing strong support for the sustainable development of oil fields.

[0005] At present, when conducting indoor simulation experiments on the development effect of B-PPG gel particles, there are two methods for injecting B-PPG gel particles: one is to inject the polymer mother liquor containing B-PPG gel particles through an ordinary piston container. The disadvantage of this method is that during the long injection process, the polymer mother liquor containing B-PPG gel particles will be stratified, and the B-PPG gel particles will easily settle to the bottom of the container under the action of gravity. The upper polymer solution does not contain B-PPG gel particles, thereby reducing the oil displacement effect of the polymer mother liquor containing B-PPG gel particles, and thus affecting the experimental results. The second is to inject the oil displacement system containing B-PPG gel particles through an ordinary piston container with an internal agitator. Although this method can rotate the oil displacement system and prevent the B-PPG gel particles from settling under the action of gravity during the long injection process, the agitator blades are likely to break the B-PPG gel particles during rotation, reducing the sealing effect of the B-PPG gel particles, and thus affecting the experimental results. Summary of the Invention

[0006] The embodiments of the present application provide a laboratory B-PPG gel particle injection system and method, which can rotate a polymer mother liquor containing B-PPG gel particles during the injection process, increase the suspension time of the B-PPG gel particles, and maintain the integrity of the B-PPG gel particles, thereby improving the effect of indoor B-PPG gel particle development effect simulation experiments.

[0007] To achieve the above-mentioned objectives, on the one hand, an embodiment of the present application provides a laboratory B-PPG gel particle injection system, comprising a pressure source, a valve and a B-PPG gel particle injection device; the inlet end of the valve is connected to the pressure source, and the outlet end is connected to the B-PPG gel particle injection device; the B-PPG gel particle injection device comprises a shell, a rotary piston container, a drive motor, a gear mechanism and a control unit; the rotary piston container is located on the side of the shell; the drive motor and the gear mechanism are both arranged in the shell; the fixed part of the drive motor is connected to the shell, and the output shaft is connected to the rotary piston container through the gear mechanism; the control unit is in communication connection with the drive motor; the control unit can control the drive motor to alternately rotate forward and reverse within a preset time range.

[0008] Furthermore, the preset time range is determined according to a graph showing the relationship between the sedimentation rate and the rotation time of the B-PPG gel particles.

[0009] Furthermore, the gear mechanism is connected to the rotary piston container via a connecting rod; a first end of the connecting rod is connected to an output end of the gear mechanism, and a second end is connected to a middle portion of an outer wall of the rotary piston container.

[0010] Furthermore, the rotary piston container includes a cylinder and a piston arranged in the cylinder; the piston divides the inner cavity of the cylinder into an upper cavity and a lower cavity; the upper cavity is used to accommodate the polymer mother liquor containing B-PPG gel particles to be injected and is connected to the experimental model; the lower cavity is connected to the pressure source.

[0011] Furthermore, the shell is a cube structure; the rotary piston container is located on the side of the shell and is vertically arranged; and the control unit is located on the upper surface of the shell.

[0012] Furthermore, it also includes a main measuring cylinder, a comparison piston container and a comparison measuring cylinder; the main measuring cylinder is connected to the upper cavity of the rotary piston container; and both ends of the comparison piston container are connected to the valve and the comparison measuring cylinder respectively.

[0013] On the other hand, an embodiment of the present application also provides an injection method based on the above-mentioned laboratory B-PPG gel particle injection system, comprising the following steps: S1. Prepare a polymer mother liquor containing B-PPG gel particles, and place the polymer mother liquor containing B-PPG gel particles into a rotary piston container; S2. Determine the rotation time of the rotary piston container according to the sedimentation rate of B-PPG in the polymer mother liquor containing B-PPG gel particles; S3. Control the drive motor through the control unit to alternately rotate forward and reverse according to the rotation time of the rotary piston container determined in step S2; S4. Start the pressure source to inject the polymer mother liquor containing B-PPG gel particles in the rotary piston container into the experimental model.

[0014] Furthermore, the step S2 specifically includes the following steps: S21, performing a rotational rheometer experiment on the polymer mother solution containing B-PPG gel particles to obtain shear stress and shear rate data of the polymer mother solution containing B-PPG gel particles; S22, according to the shear stress and shear rate data, using the power law model τ = Kr n , calculate the rheological parameters; the rheological parameters include the consistency coefficient K and the rheological index n; S23, according to the rheological parameters, the sedimentation rate of the gel particles is calculated by Stokes' law; S24, according to the relationship diagram between the sedimentation rate of the gel particles and the rotation time, the rotation time of the rotary piston container is determined.

[0015] Furthermore, the laboratory B-PPG gel particle injection system also includes a main measuring cylinder, a comparison piston container and a comparison measuring cylinder; the main measuring cylinder is connected to the upper cavity of the rotary piston container; the two ends of the comparison piston container are respectively connected to the valve and the comparison measuring cylinder; the injection method also includes step S5 comparison verification.

[0016] Furthermore, the step S5 specifically includes: S51, connecting the inlet end of the comparison piston container to the valve, and the outlet end to the comparison measuring cylinder; connecting the outlet end of the rotary piston container to the main measuring cylinder; S52, placing the polymer mother liquor containing B-PPG gel particles into the comparison piston container, and sealing the comparison piston container; S53, placing the polymer mother liquor containing B-PPG gel particles into the rotary piston container, and sealing the rotary piston container; S54, closing the inlet end of the rotary piston container, opening the inlet end and the outlet end of the comparison piston container, starting the pressure source, and making the B-PPG gel particles in the comparison piston container The polymer mother liquor containing B-PPG gel particles is displaced into the comparison measuring cylinder at the outlet end; S55, the control unit controls the driving motor to rotate alternately forward and reverse according to the rotation time of the rotary piston container determined in step S2; S56, the inlet end of the comparison piston container is closed, the inlet end and the outlet end of the rotary piston container are opened, and the pressure source is started to displace the polymer mother liquor containing B-PPG gel particles in the rotary piston container into the main measuring cylinder at the outlet end; S57, after the experiment is completed, the polymer mother liquor containing B-PPG gel particles in the main measuring cylinder and the comparison measuring cylinder are allowed to stand until the B-PPG gel particles are precipitated, and the results are compared.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] The laboratory B-PPG gel particle injection system of the embodiment of the present application controls the driving motor through the control unit to drive the rotary piston container to rotate, so that the polymer mother liquor containing B-PPG gel particles is in a rotating state during the injection process, which not only increases the suspension time of the B-PPG gel particles but also does not destroy the B-PPG gel particles, thereby ensuring the oil displacement effect of the polymer mother liquor containing B-PPG gel particles and improving the effect of the indoor B-PPG gel particle development effect simulation experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a laboratory B-PPG gel particle injection system according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of a B-PPG gel particle injection device in a laboratory B-PPG gel particle injection system according to an embodiment of the present application;

[0022] Figure 3This is a schematic diagram of the internal structure of a B-PPG gel particle injection device in a laboratory B-PPG gel particle injection system according to an embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of a rotary piston container in a laboratory B-PPG gel particle injection system according to an embodiment of the present application;

[0024] Figure 5 This is a schematic structural diagram of a laboratory B-PPG gel particle injection system according to another embodiment of the present application;

[0025] Figure 6 Schematic diagram of the solution in the main measuring cylinder;

[0026] Figure 7 Schematic diagram of the solution in the comparison cylinder;

[0027] Figure 8 This is a graph showing the relationship between sedimentation rate and rotation time. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features qualified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] An embodiment of the present application provides a laboratory B-PPG gel particle injection system, which controls the forward and reverse rotation and rotation time of the motor through a control system. The motor drives an external rotary piston container to rotate. The rotary piston container is equipped with a piston, which can ensure the continuous injection of the polymer mother liquor containing B-PPG gel particles.

[0033] Reference Figure 1 The laboratory B-PPG gel particle injection system of the present embodiment includes a pressure source 1, a valve 2, and a B-PPG gel particle injection device 3, which are arranged in sequence along the flow direction of the fluid. The pressure source 1 is a plunger pump. The valve 2 is a six-way valve.

[0034] Reference Figure 2 and Figure 3 The B-PPG gel particle injection device 3 includes a housing 31, a rotary piston container 32, a drive motor 33, a gear mechanism 34, a connecting rod 35, and a control unit 36. The housing 31 is a cubic structure. The rotary piston container 32 is located on the left side of the housing 31 and is vertically arranged. The control unit 36 is located on the upper surface of the housing 31.

[0035] Reference Figure 4 The rotary piston container 32 includes a cylinder 321 and a piston 322 disposed within the cylinder 321. The cylinder 321 is a cylindrical container made of stainless steel with a smooth, ground inner wall. Its dimensions are 150 mm in diameter and 350 mm in length. The piston 322 divides the interior of the cylinder 321 into an upper chamber 323 and a lower chamber 324. The upper chamber 323 is used to accommodate the polymer mother liquor containing B-PPG gel particles to be injected and is connected to the experimental model. The lower chamber 324 is connected to the plunger pump.

[0036] Reference Figure 2 and Figure 3 The drive motor 33 and gear mechanism 34 are both mounted in the housing 31. The fixed portion of the drive motor 33 is connected to the housing 31, and the output shaft is connected to the input end of the gear mechanism 34. The first end of the connecting rod 5 is connected to the output end of the gear mechanism 34, and the second end extends out of the housing 31 and connects to the middle of the outer wall of the rotary piston container 32. In this way, the rotary piston container 32 can rotate in a vertical plane.

[0037] The control unit 36 is in communication with the drive motor 33. The control unit 36 can control the drive motor 33 to alternately rotate forward and reverse within a preset time range. That is, the control unit 36 can control the forward and reverse rotation and the rotation time of the drive motor 33, thereby controlling the rotation direction and speed of the rotating container 32. The sedimentation time is first calculated based on the sedimentation rate of the gel particles and the cavity size of the rotary piston container, and then the sedimentation time is calculated based on the Figure 8 The plot of sedimentation time versus rotation rate can be used to determine the rotation time of a rotary piston container.

[0038] On the other hand, an embodiment of the present application further provides an injection method based on the above-mentioned laboratory B-PPG gel particle injection system, comprising the following steps:

[0039] S1. Prepare a polymer mother solution containing B-PPG gel particles, and place the polymer mother solution containing B-PPG gel particles into a rotary piston container 32.

[0040] The specific steps for preparing the polymer mother solution containing B-PPG gel particles are as follows:

[0041] Preparation of polymer mother liquor: Accurately weigh 1.1111 g of polymer powder (accurate to 0.0001 g). Weigh 198.89 g of simulated saline into a 500 mL beaker. Start a paddle stirrer and slowly add the powder along the vortex wall at 400 rpm. Stir at 500 rpm for 2 h to obtain a 0.5% polymer mother liquor. Allow to mature at room temperature for 12 h, then refrigerate. Stir thoroughly with a glass rod before use.

[0042] Prepare B-PPG mother liquor: Accurately weigh 0.5556 g of B-PPG dry powder (accurate to 0.0001 g). Weigh 99.44 g of simulated saline into a 200 mL beaker. Slowly add the dry powder along the vortex wall on a magnetic stirrer at 400 rpm. Continue stirring for 2 hours to obtain a B-PPG mother liquor with a concentration of 0.5%.

[0043] Preparation of polymer mother liquor containing B-PPG gel particles (heterogeneous composite system): Weigh 36.00 g of polymer mother liquor, add 18.00 g of BPPG mother liquor, start a paddle stirrer and stir at 400 r / min for 30 min to obtain a heterogeneous composite system.

[0044] S2. Determine the rotation time of the rotary piston container 32 according to the polymer mother solution containing B-PPG gel particles.

[0045] S21. Perform a rotational rheometer experiment on the polymer mother solution containing the B-PPG gel particles to obtain the shear stress and shear rate of the polymer mother solution containing the B-PPG gel particles.

[0046] S22, according to shear stress and shear rate, through the power law model τ = Kr n , and the consistency coefficient K = 0.5 Pa·s n , rheological index n = 0.6. In addition, the radius of the solid phase particle r = 0.0005; the density of the solid phase particle, ρ s =5199kg / m 3 ; Liquid density ρ l =1000kg / m 3 ; Gravitational acceleration g = 9.81 m / s 2 .

[0047] S23. According to Stokes' law, the sedimentation velocity v of the gel particles is calculated;

[0048]

[0049] S24. According to the relationship between the sedimentation rate of the gel particles and the rotation time, the rotation time of the rotary piston container 32 is determined to be 20.74 seconds per revolution. That is, the rotary piston container 32 will first rotate clockwise for 10.37 seconds and then automatically rotate counterclockwise for 10.37 seconds, rotating alternately.

[0050] S3. Open the control panel 36, select forward transmission, and set the rotary piston container 32 to rotate clockwise for 10.37 seconds and then automatically rotate counterclockwise for 10.37 seconds, so that the B-PPG gel particles are always in suspension in the polymer mother solution containing the B-PPG gel particles.

[0051] S4. Start the plunger pump to displace the polymer mother liquor containing B-PPG gel particles in the rotary piston container 32 into the experimental model.

[0052] Reference Figure 5 The present invention also provides another laboratory B-PPG gel particle injection system. This system differs from the first injection system described above only in that it includes a main graduated cylinder 4, a comparison piston container 5, and a comparison graduated cylinder 6. The main graduated cylinder 4 communicates with the upper chamber of the rotary piston container 32, while the two ends of the comparison piston container 5 communicate with the valve 2 and the comparison graduated cylinder 6, respectively. This injection system can be used for comparative verification.

[0053] The comparative verification method includes the following steps:

[0054] S51, connect the inlet end of the comparison piston container 5 to the valve 2, and the outlet end to the comparison measuring cylinder 6; connect the outlet end of the rotary piston container 32 to the main measuring cylinder 4;

[0055] S52, placing the polymer mother solution containing B-PPG gel particles into the comparative piston container 5, and sealing the comparative piston container 5;

[0056] S53, placing the polymer mother solution containing B-PPG gel particles into the rotary piston container 32, and sealing the rotary piston container 32;

[0057] S54, close the inlet end of the rotary piston container 32, open the inlet end and the outlet end of the comparison piston container 5, start the plunger pump, and displace the polymer mother liquid containing B-PPG gel particles in the comparison piston container 5 into the comparison measuring cylinder 6 at the outlet end;

[0058] S55. Open the control panel 36 and select forward. Based on the obtained sedimentation rate, set the rotary piston container 32 to rotate once every 20.74 seconds. The rotary piston container 32 will rotate clockwise for 10.37 seconds and then automatically rotate counterclockwise for 10.37 seconds to keep the B-PPG gel particles in suspension within the polymer mother liquor.

[0059] S56, close the inlet end of the comparison piston container 5, open the inlet end and the outlet end of the rotary piston container 32, start the plunger pump, and displace the polymer mother liquid containing B-PPG gel particles in the rotary piston container 32 into the main measuring cylinder 4 at the outlet end;

[0060] S57. After the experiment is completed, the polymer mother solution containing the B-PPG gel particles in the main measuring cylinder 4 and the comparison measuring cylinder 6 are allowed to stand until the B-PPG gel particles and the polymer mother solution are separated into layers, and the results are compared.

[0061] Depend on Figure 6 and Figure 7 It can be seen that with conventional B-PPG gel particle injection devices and methods, during the long injection process, the B-PPG gel particles settle at the bottom of the container, and the B-PPG gel particles and the polymer become stratified, preventing the B-PPG gel particles from being injected into the graduated cylinder and failing to function. By using the device and method of the present invention, the B-PPG gel particles 7 can always be suspended in the polymer mother liquor containing the B-PPG gel particles, ensuring that the B-PPG gel particles are continuously injected into the graduated cylinder, allowing the B-PPG gel particles 7 to continue to function and ensuring the success rate of the experiment.

[0062] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A laboratory B-PPG gel particle injection system, characterized in that: It includes a pressure source, a valve and a B-PPG gel particle injection device; the inlet end of the valve is connected to the pressure source, and the outlet end is connected to the B-PPG gel particle injection device; the B-PPG gel particle injection device includes a shell, a rotary piston container, a drive motor, a gear mechanism and a control unit; the rotary piston container is located on the side of the shell; the drive motor and the gear mechanism are both arranged in the shell; the fixed part of the drive motor is connected to the shell, and the output shaft is connected to the rotary piston container through the gear mechanism; the control unit is in communication connection with the drive motor; the control unit can control the drive motor to alternately rotate forward and reverse within a preset time range.

2. The laboratory B-PPG gel particle injection system according to claim 1, characterized in that: The preset time range is determined according to a graph showing the relationship between the sedimentation rate and the rotation time of the B-PPG gel particles.

3. The laboratory B-PPG gel particle injection system according to claim 2, characterized in that: The gear mechanism is connected to the rotary piston container via a connecting rod; a first end of the connecting rod is connected to the output end of the gear mechanism, and a second end is connected to the middle of the outer wall of the rotary piston container.

4. The laboratory B-PPG gel particle injection system according to claim 3, characterized in that: The rotary piston container includes a cylinder and a piston arranged in the cylinder; the piston divides the inner cavity of the cylinder into an upper cavity and a lower cavity; the upper cavity is used to accommodate the polymer mother liquor containing B-PPG gel particles to be injected and is connected to the experimental model; the lower cavity is connected to the pressure source.

5. The laboratory B-PPG gel particle injection system according to claim 4, characterized in that: The shell is a cube structure; the rotary piston container is located on the side of the shell and is vertically arranged; and the control unit is located on the upper surface of the shell.

6. The laboratory B-PPG gel particle injection system according to claim 5, characterized in that: It also includes a main measuring cylinder, a comparison piston container and a comparison measuring cylinder; the main measuring cylinder is connected to the upper cavity of the rotary piston container; and both ends of the comparison piston container are connected to the valve and the comparison measuring cylinder respectively.

7. An injection method based on the laboratory B-PPG gel particle injection system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Prepare a polymer mother solution containing B-PPG gel particles, and place the polymer mother solution containing B-PPG gel particles into a rotary piston container; S2. determining the rotation time of the rotary piston container according to the sedimentation rate of the B-PPG gel particles in the polymer mother solution containing the B-PPG gel particles; S3, controlling the driving motor through the control unit to alternately rotate forward and reverse according to the rotation time of the rotary piston container determined in step S2; S4. Start the pressure source and inject the polymer mother solution containing B-PPG gel particles in the rotary piston container into the experimental model.

8. The injection method according to claim 7, characterized in that The step S2 specifically includes the following steps: S21, performing a rotational rheometer experiment on the polymer mother solution containing B-PPG gel particles to obtain shear stress and shear rate data of the polymer mother solution; S22, based on the shear stress and shear rate data, the power law model τ = Kr n , calculate the rheological parameters; the rheological parameters include consistency coefficient K and rheological index n; S23. Calculate the sedimentation rate of the gel particles based on the rheological parameters and Stokes' law; S24. Determine the rotation time of the rotary piston container according to the relationship diagram between the sedimentation rate of the gel particles and the rotation time.

9. The injection method according to claim 7, characterized in that: The laboratory B-PPG gel particle injection system also includes a main measuring cylinder, a comparison piston container and a comparison measuring cylinder; the main measuring cylinder is connected to the upper cavity of the rotary piston container; the two ends of the comparison piston container are respectively connected to the valve and the comparison measuring cylinder; the injection method also includes step S5 comparison verification.

10. The injection method according to claim 9, characterized in that: The step S5 specifically includes: S51, connecting the inlet end of the comparison piston container to the valve, and the outlet end to the comparison measuring cylinder; connecting the outlet end of the rotary piston container to the main measuring cylinder; S52, placing the polymer mother solution containing the B-PPG gel particles into a comparative piston container, and sealing the comparative piston container; S53, placing the polymer mother solution containing the B-PPG gel particles into a rotary piston container, and sealing the rotary piston container; S54, closing the inlet of the rotary piston container, opening the inlet and outlet of the comparative piston container, and starting the pressure source to displace the polymer mother liquor containing B-PPG gel particles in the comparative piston container into the comparative graduated cylinder at the outlet; S55, controlling the driving motor through the control unit to alternately rotate forward and reverse according to the rotation time of the rotary piston container determined in step S2; S56, closing the inlet of the comparative piston container, opening the inlet and outlet of the rotary piston container, and starting the pressure source to displace the polymer mother liquor containing B-PPG gel particles in the rotary piston container into the main graduated cylinder at the outlet; S57. After the experiment is completed, the polymer mother solution containing B-PPG gel particles in the main measuring cylinder and the comparison measuring cylinder is allowed to stand until the B-PPG gel particles are precipitated, and the results are compared.

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