Device and method for evaluating plugging capacity of temporary plugging material considering dynamic flushing of working fluid

Abstract

This invention discloses an evaluation device and method for the sealing capacity of temporary plugging materials considering dynamic scouring of working fluid, belonging to the technical field of temporary plugging material evaluation in drilling engineering. The device includes a vessel with a replaceable fracture module, and a main injection circuit and a secondary scouring circuit respectively connected to the inlet of the vessel. A dual-circuit control valve is installed between the two circuits. The secondary scouring circuit is equipped with a working fluid circulation tank and a variable frequency peristaltic pump, which, together with the vessel, forms a closed-loop fluid circuit. The evaluation method includes: injecting the plug through the main injection circuit and recording the initial pressure strength P0; operating the control valve to switch in-situ to the secondary scouring circuit to continuously and dynamically scour the plugging layer; after scouring, switching back to the main injection circuit in-situ for stepwise pressurization and measuring the residual pressure strength P1; and calculating the plugging compressive strength retention rate R based on P0 and P1. This invention realizes integrated continuous non-destructive testing of scouring and pressure bearing, truly restoring the dynamic flow field downhole, making the evaluation results scientific and reliable.

Description

Technical Field

[0001] This invention belongs to the technical field of evaluation of temporary plugging materials in drilling engineering, specifically involving a device and method for evaluating the plugging capacity of temporary plugging materials considering the dynamic scouring of working fluid. Background Technology

[0002] Controlling lost circulation in fractured formations is a major technical challenge in drilling engineering. Currently, the evaluation of temporary plugging materials in the laboratory mainly relies on testing the maximum pressure resistance using a pressure-bearing plugging instrument to determine the material's quality. However, in actual field operations, once the plugging layer forms, it is subjected to dynamic scouring, shearing, carrying, and erosion by the circulating working fluid over a long period. Many plugging layers that meet the laboratory pressure resistance standards are washed away, damaged, or leaked downhole, leading to repeated plugging, significantly increased costs, and project delays.

[0003] The existing technologies and patents have the following obvious defects: 1) The existing technologies only evaluate static pressure bearing, filling, temporary plugging and degradation performance, without considering the dynamic scouring damage of the working fluid; 2) In the existing technologies, scouring and pressure bearing are carried out in steps, requiring sample disassembly and reassembly, which leads to the destruction of the sealing layer structure and the distortion of the results; 3) The existing technologies do not have unified and quantitative scouring resistance evaluation indicators, and cannot scientifically compare different temporary plugging materials.

[0004] To this end, this invention proposes a dynamic flushing + pressure-bearing integrated continuous quantitative evaluation method and device, which truly restores the flushing conditions of downhole working fluid and realizes accurate evaluation and scientific selection of the sealing capacity of temporary plugging materials. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an evaluation device and method for the sealing capacity of temporary plugging materials that takes into account the dynamic scouring of the working fluid, thereby solving the problems in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions: An evaluation device for the plugging capacity of temporary plugging materials considering dynamic flushing of working fluid includes a vessel body with a heating jacket, a confining pressure system and a replaceable crack module. The device also includes a main injection circuit, a secondary flushing circuit and a dual-circuit control valve. The main injection circuit is connected to the inlet end of the vessel body; The two ends of the auxiliary flushing circuit are respectively connected to the inlet end and the outlet end of the vessel body, and together with the vessel body, they form a closed-loop fluid circuit; the auxiliary flushing circuit includes a working fluid circulation tank, a variable frequency peristaltic pump, and a full-bore connector connected in sequence through pipelines; The dual-loop control valves are respectively installed on the main injection loop and the secondary flushing loop.

[0007] Furthermore, the device also includes a data monitoring and acquisition system, which includes an inlet pressure sensor installed at the inlet end of the vessel body, an outlet pressure sensor and a flow meter installed at the outlet end of the auxiliary flushing circuit, and an electronic balance installed below the leakage outlet of the vessel body.

[0008] Furthermore, the replaceable crack module includes: a flat crack module, a wedge-shaped crack module, or a variable-width crack module. The internal crack width of the replaceable crack module is 0.5mm~10mm, and the crack length is 30mm~100mm. The material of the replaceable crack module includes marble, artificial rock core, or stainless steel.

[0009] Furthermore, the working fluid circulation tank is equipped with an anti-settling stirring device.

[0010] The evaluation method for the plugging capacity of temporary plugging materials considering dynamic flushing by the working fluid adopts the above-mentioned evaluation device and includes the following steps: S1, open the dual-loop control valve on the main injection circuit, and inject temporary plugging material slurry into the replaceable fracture module of the vessel body through the main injection circuit. Apply injection pressure until the cumulative leakage through the replaceable fracture module stops increasing. After standing and waiting for plugging, measure and record the initial pressure strength through the inlet pressure sensor. ; S2, the auxiliary flushing circuit is opened through the dual-circuit control valve and the main injection circuit is closed. The variable frequency peristaltic pump is started to make the working fluid circulate in the closed-loop fluid circuit to continuously and dynamically flush the temporary plugging material at the replaceable crack module. At the same time, the flushing time, the instantaneous leakage of the leaking fluid and the inlet pressure are continuously recorded. S3, shut down the variable frequency peristaltic pump, and reconnect the main injection circuit through the dual-circuit control valve to perform a step-by-step pressurization test. Record the inlet pressure value at the moment when the instantaneous leakage suddenly increases as the residual pressure strength. The criterion for determining a sudden increase in instantaneous leakage is: the instantaneous leakage is ≥ 6 times the real-time leakage baseline. S4, based on the initial bearing strength and residual compressive strength Calculate the retention rate R of the sealing compressive strength: To evaluate its resistance to erosion.

[0011] Furthermore, the loading rate of the step-by-step pressurization test is 0.5 MPa / 30 s.

[0012] Furthermore, the flushing flow rate of the variable frequency peristaltic pump is set within the range of 5~50 mL / min.

[0013] Furthermore, in S2, the triggering condition for stopping dynamic flushing and entering S3 is: reaching a preset fixed flushing time, or reaching a preset leakage threshold based on the recorded instantaneous leakage amount.

[0014] Furthermore, the steps for evaluating erosion resistance include: If R ≥ 80%, the sealing layer is considered to have excellent erosion resistance. If 50%≤R<80%, the sealing layer is judged to have good erosion resistance. If R < 50%, the sealing layer is judged to have poor erosion resistance.

[0015] Furthermore, the method also includes a step of extracting the effective blocking stabilization time: Based on the data recorded in S2 and S3, the time span from the start of the variable frequency peristaltic pump to the moment when the instantaneous leakage in S2 or S3 suddenly increases or reaches the preset leakage threshold is extracted, and the time span is defined as the effective sealing stabilization time T.

[0016] The beneficial effects of this invention are: 1. This invention designs a switching system consisting of a main injection circuit, a secondary flushing circuit, and dual-circuit control valves. During circuit switching transitions, after flushing, there is no need to disassemble the vessel or move the crack module; the system can be switched back from the secondary circuit flushing mode to the main circuit pressure-bearing mode simply by operating the dual-circuit control valves. This combination of structure and steps avoids the loosening and damage to the sealing layer structure caused by the disassembly and reassembly of samples required for step-by-step testing in traditional evaluation methods. It maintains the continuity of the physical state of the sealing layer before and after flushing, thereby significantly improving the authenticity and accuracy of the residual pressure-bearing strength test results. 2. The auxiliary flushing circuit of this invention employs a variable frequency peristaltic pump and a full-bore connector at the pipeline connection, forming a fully enclosed circulation loop together with the high-temperature and high-pressure reactor. In step S2 of Example 2, this system is used to apply a continuous circulating flush of 5-50 mL / min to the temporary plugging material. By providing a stable flow rate through the variable frequency peristaltic pump, combined with the full-bore connector to prevent pipeline throttling and eddy current generation, this scheme realistically reproduces the dynamic physical effects of continuous shearing and erosion of the plugging layer by the downhole working fluid flowing in the annulus during laboratory testing. This fills the technical gap where conventional instruments can only perform static injection pressure testing.

[0017] 3. This invention clarifies the method for determining the initial bearing strength using static injection molding. In-situ flushing Determining residual bearing strength by applying pressure in stages The continuous timing sequence, and in step S4, the use of formula is proposed. The method calculates the retention rate of the sealing pressure resistance and combines it with the cumulative leakage Q and the effective sealing stabilization time T for a comprehensive rating. This method concretizes the previously vague erosion resistance into specific pressure data, time spans, and dimensionless proportions. Through logical calculations of physical parameters, it provides a unified and objective benchmark for temporary plugging materials of different materials and ratios, facilitating scientific material selection by engineers before field application.

[0018] 4. This invention employs replaceable fracture modules in the device, whose internal fracture width can be adjusted within the range of 0.5mm to 10mm, and offers different material options such as marble, artificial rock cores, or stainless steel. Through this modular and replaceable hardware design, the device is not only easy to assemble but also flexibly adaptable to fractured and leaky formations with different aperture sizes and wall roughness. This allows the same device to cover multi-scale simulation tests ranging from micro-fractures to large fractures, effectively broadening the application scenarios and scientific research scope of this invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the temporary plugging material sealing capacity evaluation device of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 This embodiment proposes a device for evaluating the plugging capacity of temporary plugging materials that considers the dynamic scouring of the working fluid. In actual downhole conditions, the dynamic scouring of the working fluid causes erosion of plugging particles, fiber pulling, gel destruction, and structural loosening, ultimately leading to a decrease in pressure-bearing capacity. This invention aims to address the key deficiency of existing technologies in simulating the dynamic circulation scouring of the working fluid, achieving a continuous and integrated evaluation that first dynamically scours and then directly applies pressure without sample removal. This realistically reproduces the downhole working fluid scouring conditions, enabling accurate evaluation and scientific selection of the plugging capacity of temporary plugging materials. Furthermore, this device has a very simple structure, can be assembled using conventional experimental equipment, and has a wide range of applications.

[0023] like Figure 1 As shown, the device mainly includes: a high-temperature and high-pressure vessel (main system), a dual-loop fluid system (main injection loop and auxiliary flushing loop), and a data monitoring and acquisition system. The specific structure and connection relationship are as follows: 1. Main system and highly realistic crack module The main system employs a high-temperature, high-pressure plugging apparatus with a heating jacket and confining pressure system. To recreate realistic downhole complex conditions, the apparatus is equipped with a heating jacket and confining pressure system. Inside the apparatus are replaceable fracture modules, designed to simulate leakage channels at multiple scales and in various forms. These modules can be replaced with flat fracture modules, wedge-shaped fracture modules, or variable-width fracture modules, and their internal fracture width is continuously adjustable within the range of 0.5mm to 10mm, while the fracture length can be set from 30mm to 100mm. Furthermore, to match the roughness characteristics of different leakage formations, the replaceable fracture modules can be flexibly made of marble, artificial rock cores, or stainless steel.

[0024] 2. Dual-circuit switching system To achieve in-situ, non-disassembly evaluation, the device introduces a fluid switching architecture consisting of a main injection circuit, a secondary flushing circuit, and dual-circuit control valves.

[0025] One end of the main injection loop is connected to a material tank for holding the temporary plugging material slurry, and the other end is connected to the inlet of the high-temperature and high-pressure vessel, specifically for providing the initial static injection power for plugging. The secondary flushing loop is used to simulate the dynamic circulation flushing of the downhole working fluid. The two ends of this secondary loop are connected to the inlet and outlet of the high-temperature and high-pressure vessel, respectively, forming a closed-loop fluid circuit with the vessel's interior. In terms of hardware configuration, the secondary flushing loop is sequentially connected via pipelines to a 1000mL working fluid circulation tank, a variable frequency peristaltic pump, and a full-bore connector. The working fluid circulation tank is equipped with an anti-settling mechanical agitator (impeller) to prevent the settling of solid particles in the working fluid; the variable frequency peristaltic pump's speed is adjustable between 0 and 400 r / min, providing a stable flushing flow rate output of 0 to 100 mL / min; the full-bore connector's design physically avoids throttling or eddy current effects when the fluid passes through the connector, ensuring that the flushing flow field closely approximates the actual stable laminar flow state of the wellbore.

[0026] Dual-loop control valves are installed on the main injection loop and the secondary flushing loop respectively (usually connected in parallel at the inlet end of the vessel). By switching these control valves, the two fluid paths do not interfere with each other, and operators can achieve one-click switching between injection and flushing states without opening the vessel to remove samples, moving the fracture module, or disturbing the formed sealing layer.

[0027] 3. High-precision monitoring and acquisition system To capture the evolution of the material's microscopic properties during the scouring process, the device is equipped with a comprehensive data monitoring and acquisition system. This system includes: an inlet pressure sensor (range 0-20 MPa, used for real-time acquisition of scouring and pressure) located at the inlet of the high-temperature, high-pressure reactor; an outlet pressure sensor (range 0-5 MPa, used for monitoring outlet back pressure) and a flow meter (used for real-time monitoring of circulating flow rate) located at the outlet of the secondary scouring loop; in addition, an electronic balance with a range of 0-3000 g and an accuracy of up to 0.01 g is installed below the leakage outlet at the bottom of the high-temperature, high-pressure reactor. Furthermore, to address the splashing and flash evaporation issues caused by direct discharge of the high-temperature, high-pressure fluid, a back pressure control valve and a condensation and pressure reduction device are connected in series between the leakage outlet at the bottom of the high-temperature, high-pressure reactor and the receiving cup, ensuring that the high-temperature, high-pressure leakage fluid, after being converted into atmospheric pressure and room temperature droplets, drips smoothly into the receiving cup for accurate weighing. This is used for real-time, high-precision acquisition of the mass / volume of leakage fluid passing through the crack module.

[0028] Example 2 This embodiment, based on the evaluation device described in Embodiment 1, provides a method for evaluating the plugging capacity of temporary plugging materials considering the dynamic scouring of the working fluid. This method divides the testing process into four main steps: plugging, scouring, residual pressure bearing, and quantitative evaluation, completely eliminating data distortion caused by manual disassembly and transfer in traditional evaluations. The evaluation method specifically includes the following steps: Step S1: Static injection plugging and initial strength determination; First, prepare for the experiment: select and install a replaceable crack module of a specific shape (such as a parallel crack or a wedge crack), set the experimental temperature (room temperature to 150°C range) and confining pressure (0 to 10 MPa range), and check the airtightness to ensure there is no leakage.

[0029] Subsequently, the dual-loop control valve on the main injection circuit is opened, and the temporary plugging material slurry (covering different systems such as particles, fibers, gels, or solidified materials) is pumped into the replaceable fracture module of the high-temperature and high-pressure reactor through the main injection circuit. A constant pressure of 3-5 MPa is applied during injection until the cumulative leakage through the replaceable fracture module stops increasing (i.e., there is essentially no leakage). In this state, a static plugging / setting time of 5-30 minutes is set according to the material characteristics. After the sealing layer forms, an initial pressure test is conducted, and the initial pressure strength P0 (MPa) is measured and recorded using an inlet pressure sensor.

[0030] Step S2: In-situ closed-loop dynamic flushing; After plugging, do not disassemble, move, or open the vessel. Before switching valves, first start the variable frequency peristaltic pump to establish a closed-loop bypass circulation within the secondary flushing circuit, and adjust the fluid base pressure in the secondary flushing circuit to balance with P0 based on the initial pressure strength P0 recorded in step S1; after the pressure is balanced, then synchronously switch the valve to the closed-loop flushing circuit, that is, smoothly conduct the secondary flushing circuit and close the main injection circuit to avoid instantaneous pressure difference from damaging the plugging layer. Prepare the experimental working fluid (water-based, oil-based, or polymer working fluid can be selected as needed) in the working fluid circulation tank, and start the variable frequency peristaltic pump. Set the flushing flow rate of the variable frequency peristaltic pump in the range of 5mL / min to 50mL / min, so that the working fluid continuously circulates through the fracture module in the closed-loop fluid circuit, applying continuous circulating penetrating dynamic flushing to the temporarily plugged sealing layer formed in the fracture; this flushing condition simulates the dynamic destructive effect of drilling fluid continuously penetrating the fracture and reciprocatingly eroding the plugging particles and gel at the downhole lost circulation zone. During this flushing phase, the system continuously records the flushing time, the instantaneous leakage volume of the leaked fluid, the cumulative leakage volume Q (i.e., the total leakage volume from the beginning to the end of the flushing phase), and the inlet pressure.

[0031] The stop trigger condition for this step is set as follows: when the preset fixed flushing time (such as 10 min, 20 min or 30 min) is reached, or when the recorded instantaneous leakage amount reaches the preset leakage threshold (i.e. the leakage amount increases significantly), the dynamic flushing stops and proceeds to the next step.

[0032] Step S3: Residual strength capture and failure determination; After flushing, the variable frequency peristaltic pump is shut off, and the main injection circuit is reconnected via the dual-loop control valve to switch back to the pressure-bearing mode. A slow, step-by-step pressurization test is then performed on the high-temperature, high-pressure reactor, with the specific pressurization rate strictly controlled at 0.5 MPa / 30 seconds.

[0033] During the gradual pressurization process, the leakage data transmitted by the balance is closely monitored. Based on the physical phenomenon of a sudden, step-like increase in instantaneous leakage, it is determined that the sealing layer structure has been damaged and failed. The determination criteria for a sudden, step-like increase in instantaneous leakage are as follows: the sampling interval of the electronic balance is uniformly set to 5 seconds, and a set of instantaneous leakage volumes q is output every 5 seconds. t (Unit: mL / 5s, working solution density approximately 1 g / mL, balance mass reading directly converted to volume); The sliding 3-point baseline magnification determination method is adopted, taking into account universality, immediacy, and anti-interference ability, with the following rules: 1. Real-time baseline calculation: The average of three consecutive sets of stable leakage data preceding the current sampling point is used as the real-time leakage baseline. : 2. Sudden increase judgment core threshold (applicable to all crack sizes 0.5~10mm, granular / fiber / gel-based temporary plugging materials, no need for adjustment according to working conditions): If the current instantaneous leakage amount satisfies q t ≥6× (Real-time leakage baseline) Immediately determine that the sealing layer has experienced a step increase in failure, lock the inlet pressure at that moment as the residual bearing capacity P1, and terminate pressurization; Meanwhile, based on the data streams recorded in steps S2 and S3, the time span from the start of the variable frequency peristaltic pump flushing to the moment when the instantaneous leakage amount increases sharply in this step is extracted, and this time span is defined and recorded as the effective sealing stabilization time T.

[0034] Step S4: Establish a quantitative evaluation system for erosion resistance; Based on the aforementioned steps, three quantitative indicators are calculated to obtain scientifically comparable evaluation standards: Dynamic flushing cumulative leakage Q (mL): that is, the total leakage volume from the beginning to the end of the flushing stage.

[0035] Effective sealing stabilization time T (min): The time span from the start of flushing to the sudden increase in leakage and the beginning of sealing failure.

[0036] The retention rate of the sealing compressive strength R (%) is calculated using the following formula: Finally, the evaluation and grading are based on the retention rate R of the sealing compressive strength: if It is judged to have excellent erosion resistance; if The erosion resistance is deemed good; if The erosion resistance was determined to be poor.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A device for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of working fluid, comprising a vessel body with a heating jacket, a confining pressure system, and a replaceable crack module, characterized in that, The device also includes a main injection circuit, a secondary flushing circuit, and a dual-circuit control valve; The main injection circuit is connected to the inlet end of the vessel body; The two ends of the auxiliary flushing circuit are respectively connected to the inlet end and the outlet end of the vessel body, and together with the vessel body, they form a closed-loop fluid circuit; the auxiliary flushing circuit includes a working fluid circulation tank, a variable frequency peristaltic pump, and a full-bore connector connected in sequence through pipelines; The dual-loop control valves are respectively installed on the main injection loop and the secondary flushing loop.

2. The device for evaluating the sealing capacity of temporary plugging materials considering dynamic scouring of working fluid according to claim 1, characterized in that, The device also includes a data monitoring and acquisition system, which includes an inlet pressure sensor installed at the inlet end of the vessel body, an outlet pressure sensor and a flow meter installed at the outlet end of the auxiliary flushing circuit, and an electronic balance installed below the leakage outlet of the vessel body.

3. The device for evaluating the sealing capacity of temporary plugging materials considering dynamic scouring of working fluid according to claim 1, characterized in that, The replaceable crack module includes: a flat crack module, a wedge-shaped crack module, or a variable-width crack module. The internal crack width of the replaceable crack module is 0.5mm~10mm, and the crack length is 30mm~100mm. The material of the replaceable crack module includes marble, artificial rock core, or stainless steel.

4. The device for evaluating the sealing capacity of temporary plugging materials considering dynamic scouring of working fluid according to claim 1, characterized in that, The working fluid circulation tank is equipped with an anti-settling stirring device.

5. A method for evaluating the plugging capacity of temporary plugging materials considering dynamic flushing of the working fluid, using the evaluation device described in claim 2, characterized in that... Includes the following steps: S1, open the dual-loop control valve on the main injection circuit, and inject temporary plugging material slurry into the replaceable fracture module of the vessel body through the main injection circuit. Apply injection pressure until the cumulative leakage through the replaceable fracture module stops increasing. After standing and waiting for plugging, measure and record the initial pressure strength through the inlet pressure sensor. ; S2, the auxiliary flushing circuit is opened through the dual-circuit control valve and the main injection circuit is closed. The variable frequency peristaltic pump is started to make the working fluid circulate in the closed-loop fluid circuit to continuously and dynamically flush the temporary plugging material at the replaceable crack module. At the same time, the flushing time, the instantaneous leakage of the leaking fluid and the inlet pressure are continuously recorded. S3, shut down the variable frequency peristaltic pump, and reconnect the main injection circuit through the dual-circuit control valve to perform a step-by-step pressurization test. Record the inlet pressure value at the moment when the instantaneous leakage suddenly increases as the residual pressure strength. The criterion for determining a sudden increase in instantaneous leakage is: the instantaneous leakage is ≥ 6 times the real-time leakage baseline. S4, based on the initial bearing strength and residual compressive strength Calculate the retention rate R of the sealing compressive strength: To evaluate its resistance to erosion.

6. The method for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of the working fluid according to claim 5, characterized in that, The loading rate for the stepwise pressurization test was 0.5 MPa / 30 s.

7. The method for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of the working fluid according to claim 5, characterized in that, The flushing flow rate of the variable frequency peristaltic pump is set within the range of 5~50 mL / min.

8. The method for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of the working fluid according to claim 5, characterized in that, In S2, the trigger condition for stopping dynamic flushing and entering S3 is: reaching a preset fixed flushing time, or reaching a preset leakage threshold based on the recorded instantaneous leakage amount.

9. The method for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of the working fluid according to claim 5, characterized in that, The steps for evaluating erosion resistance include: If R ≥ 80%, the sealing layer is judged to have excellent erosion resistance; If 50%≤R<80%, the sealing layer is judged to have good erosion resistance. If R < 50%, the sealing layer is judged to have poor erosion resistance.

10. The method for evaluating the plugging capacity of temporary plugging materials considering dynamic scouring of the working fluid according to claim 5, characterized in that, The method also includes a step for extracting the effective stabilization time of the blockade: Based on the data recorded in S2 and S3, the time span from the start of the variable frequency peristaltic pump to the moment when the instantaneous leakage in S2 or S3 suddenly increases or reaches the preset leakage threshold is extracted, and the time span is defined as the effective sealing stabilization time T.

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