Experiment integrated system for simulating structure and strength of plugging layer under pressure fluctuation

Abstract

The invention provides an experimental integrated system for simulating the structure and strength of a plugging layer under pressure fluctuation, and relates to the technical field of testing or analyzing materials by means of measuring the chemical or physical properties of the materials, the experimental integrated system comprises a crack simulation system, and the upper end of the crack simulation system is connected with a plugging liquid circulation system and a base liquid circulation system; the lower end of the crack simulation system is connected with a plugging fluid displacement system and a base fluid displacement system, the left end of the crack simulation system is connected with a working fluid overflow system, the right end of the crack simulation system is connected with a working fluid leakage system and a base fluid flowback system, and the crack simulation system is electrically connected with a high-speed camera. The problem that in the prior art, the experimental result deviation is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of testing or analyzing materials by means of measuring the chemical or physical properties of materials, and in particular to an experimental integrated system for simulating the structure and strength of a sealing layer under pressure fluctuations. Background Art

[0002] According to geological data, fractured reservoirs account for over 50% of the world's total reserves. These formations are prone to inducing severe losses during drilling, leading to extended drilling cycles, surging costs, and even failure of wellbore integrity. Therefore, conducting plugging test evaluations on peri-well fractures can help understand the plugging mechanisms of different plugging materials and improve the success rate of on-site plugging operations. However, current plugging effect evaluation devices still have design limitations, including the widespread use of static pressure testing methods, which make it difficult to accurately reflect the failure mechanism of the plugging layer caused by dynamic pressure changes such as suction pressure and excitation pressure during drilling. This results in significant deviations from actual operating conditions. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated experimental system for simulating the structure and strength of a plugging layer under pressure fluctuations, which solves the problem of large deviation in experimental results in the prior art.

[0004] The technical solution of the present invention:

[0005] The present invention provides an experimental integrated system for simulating the structure and strength of a plugging layer under pressure fluctuations, comprising a fracture simulation system, wherein the upper end of the fracture simulation system is connected to a plugging liquid circulation system and a base liquid circulation system, the lower end of the fracture simulation system is connected to a plugging liquid displacement system and a base liquid displacement system, the left end of the fracture simulation system is connected to a working fluid overflow system, the right end of the fracture simulation system is connected to a working fluid loss system and a base liquid return system, and the fracture simulation system is electrically connected to a high-speed camera.

[0006] Furthermore, the crack simulation system includes a first crack body, a sealing rigid body, and a second crack body connected in sequence, and the materials of the first crack body and the second crack body are both organic glass.

[0007] Furthermore, the first crack body, the sealing rigid body and the second crack body are each provided with a plurality of bolt holes, and the plurality of bolt holes are arranged in a ring shape. The surface of the first crack body close to the sealing rigid body is provided with a crack area, and the surface of the second crack body close to the sealing rigid body is provided with a pressure-sensitive adhesive area.

[0008] Furthermore, the sealing rigid body is provided with a lower port, a right port, an upper port and a left port whose axes are perpendicular to the axis of the bolt hole; the plugging liquid circulation system and the base liquid circulation system are both connected to the upper port, the working fluid loss system is connected to the right port, and the working fluid overflow system is connected to the left port.

[0009] Furthermore, sealing rings are connected to both sides of the sealing rigid body.

[0010] Furthermore, the plugging liquid displacement system includes a first air compressor, a first pressure-stabilizing gas tank, a first pressure-stabilizing valve, a plugging liquid container and a first valve connected in sequence. The lower end of the plugging liquid container is connected to the lower port, and the upper end is connected to the plugging liquid circulation system.

[0011] Furthermore, the base liquid displacement system includes a third air compressor, a third pressure stabilizing gas tank, a third pressure stabilizing valve, a base liquid container and a third valve connected in sequence. The lower end of the base liquid container is connected to the lower port, and the upper end is connected to the base liquid circulation system.

[0012] Furthermore, the plugging liquid circulation system includes a second valve, a second flowmeter and a second one-way valve connected in sequence; the base liquid circulation system includes a fourth valve, a fourth flowmeter and a fourth one-way valve connected in sequence.

[0013] Furthermore, the base liquid return system includes a seventh air compressor, a seventh pressure-stabilizing gas tank, a seventh pressure-stabilizing valve, a return liquid container and a seventh valve connected in sequence, and the lower end of the return liquid container is connected to the right port.

[0014] Furthermore, the working fluid loss system includes a sixth valve, a sixth flowmeter and a sixth lost fluid recovery container connected in sequence; the working fluid overflow system includes an eighth valve, an eighth flowmeter and an eighth lost fluid recovery container connected in sequence.

[0015] According to the above technical features, the beneficial effects of the present invention are:

[0016] An embodiment of the present invention provides an integrated experimental system for simulating the structure and strength of the plugging layer under pressure fluctuations. Through the design of an independent plugging fluid displacement system and a base fluid displacement system, precise control of the injection and flowback of the plugging fluid and the base fluid is achieved, solving the problem that the static pressure testing method is difficult to reflect dynamic pressure changes. Through the synergistic effect of the plugging fluid circulation system and the base fluid circulation system, the influence of the shearing effect generated by the drilling fluid during the circulation process on the performance of the plugging material is truly simulated, ensuring that the dynamic plugging effect of the plugging formula under actual drilling conditions is accurately evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Provides a schematic structural diagram of an experimental integration system for the present invention;

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the crack system of the device provided by the present invention.

[0019] In the figure: 1-plugging fluid displacement system; 2-plugging fluid circulation system; 3-base fluid displacement system; 4-base fluid circulation system; 5-crack simulation system; 6-working fluid loss system; 7-base fluid flowback system; 8-working fluid overflow system; 9-high-speed camera; 10-first crack body; 11-sealing rigid body; 12-second crack body; 101, 112, 121-bolt holes; 102-crack area; 111-lower port; 113-sealing ring; 114-right port; 115-upper port; 116-left port; 122-pressure-sensitive film area. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0022] Example 1

[0023] Please refer to Figure 1-Figure 2 An embodiment of the present invention provides an experimental integrated system for simulating the structure and strength of a plugging layer under pressure fluctuations. The integrated system includes a fracture simulation system 5, wherein the upper end of the fracture simulation system 5 is connected to a plugging liquid circulation system 2 and a base liquid circulation system 4, the lower end of the fracture simulation system 5 is connected to a plugging liquid displacement system 1 and a base liquid displacement system 3, the left end of the fracture simulation system 5 is connected to a working fluid overflow system 8, the right end of the fracture simulation system 5 is connected to a working fluid loss system 6 and a base liquid return system 7, and the fracture simulation system 5 is electrically connected to a high-speed camera 9.

[0024] It is worth noting that an embodiment of the present invention provides an experimental integrated system for simulating the structure and strength of the plugging layer under pressure fluctuations. Through independent plugging fluid displacement system 1, base fluid displacement system 3 and base fluid return system 7, the injection and return of plugging fluid and base fluid are controlled respectively, thereby accurately simulating the impact of downhole pressure fluctuations on the stability of the plugging layer. The existing technology is unable to simulate the impact of the shearing effect of the drilling fluid during the circulation process on the performance of the plugging material, resulting in the inability to accurately evaluate the dynamic plugging effect of the plugging formula under actual drilling conditions. This embodiment, through the configured plugging fluid circulation system 2 and base fluid circulation system 4, truly simulates the dynamic plugging effect during the circulation of the drilling fluid, ensuring the performance verification of the plugging formula under the action of flow shear; the existing device lacks a means to measure the structural strength of the accumulation body during the plugging process, and cannot achieve a quantitative evaluation of the change in the structural strength of the accumulation body. In this embodiment, the high-speed camera 9 is electrically connected to the crack simulation system 5, which is used to simulate the geological crack environment and realize experimental operations under various pressure fluctuation conditions. The high-speed camera 9 is used to monitor the plugging formation process and the corresponding color change in real time, thereby capturing the process of crack color change, and combining the preset color intensity correspondence to determine the strength of the accumulation body formed by the plugging material, thereby quantitatively evaluating the plugging effect of the plugging formula. This embodiment solves the problem of large deviation in experimental results in the existing technology.

[0025] Furthermore, the crack simulation system 5 includes a first crack body 10, a sealing rigid body 11, and a second crack body 12 connected in sequence. The first crack body 10 and the second crack body 12 are made of organic glass. The prior art uses a smooth wedge-shaped steel plate to simulate geological cracks, but its key parameters such as surface roughness and tortuosity are quite different from those of real geological cracks, which leads to a significant deviation between the laboratory observation results of the bridging behavior and the plugging mechanism of the plugging material and the actual working conditions. This embodiment uses organic glass material, which has good transparency, and is convenient for real-time observation of the internal fluid behavior and the plugging process by a high-speed camera 9 during the experiment. Combined with three-dimensional engraving technology, the crack surface is finely processed to achieve the reproduction of the roughness and tortuosity of the real crack, so that the crack surface characteristics are as consistent as possible with the actual geological crack. The modular structure is easy to disassemble and replace, and repeated experimental comparisons of different plugging formulas are achieved, overcoming the problem of large differences in characteristics between the smooth wedge-shaped steel plate and the real geological crack in the prior art.

[0026] Furthermore, the first crack body 10, the sealing rigid body 11, and the second crack body 12 are all provided with a plurality of bolt holes 101, 112, and 121. The first crack body 10 is provided with a plurality of bolt holes 101, the sealing rigid body 11 is provided with a plurality of bolt holes 112, and the second crack body 12 is provided with a plurality of bolt holes 121. The plurality of bolt holes 101, 112, and 121 are arranged in a ring shape, and are used to tightly fix the first crack body 10, the sealing rigid body 11, and the second crack body 12 and form a sealed whole through bolt connection and a modular structure, which is convenient for disassembly and replacement, so as to realize repeated experimental comparison of different plugging formulas. The surface of the first crack body 10 close to the sealing rigid body 11 is provided with a crack area 102, which is used to simulate the bridging behavior of the crack; the surface of the second crack body 12 close to the sealing rigid body 11 is provided with a pressure-sensitive adhesive area 122, which is used to evaluate the strength of the accumulation body by color development technology, that is, to monitor the strength change of the accumulation body formed by the plugging material, and reflect the stress condition of the accumulation body through the color change. In detail, pressure-sensitive film color development technology is adopted and a high-speed camera 9 is used to capture the color changes of the pressure-sensitive film during the process of the sealing material forming an accumulation body in the crack. The strength of the accumulation body formed by the sealing material is determined according to the color, and the sealing effect of the plugging formula is quantitatively evaluated, which solves the problem of the lack of means to measure the structural strength of the accumulation body in the existing technology.

[0027] Furthermore, the sealing rigid body 11 is provided with a lower port 111, a right port 114, an upper port 115 and a left port 116 whose axes are perpendicular to the axes of the bolt holes 101, 112, and 121. The plugging liquid circulation system 2 and the base liquid circulation system 4 are both connected to the upper port 115, the working fluid loss system 6 is connected to the right port 114, and the working fluid overflow system 8 is connected to the left port 116, which are respectively used to connect different systems, thereby realizing liquid flow simulation under various working conditions.

[0028] Furthermore, sealing rings 113 are connected to both sides of the sealing rigid body 11 to ensure that the entire system maintains good sealing during operation.

[0029] Furthermore, the plugging fluid displacement system 1 includes a first air compressor, a first pressure-stabilizing gas tank, a first pressure-stabilizing valve, a plugging fluid container, and a first valve, which are connected in sequence. The lower end of the plugging fluid container is connected to the lower port 111, and the upper end is connected to the plugging fluid circulation system 2. By adjusting the pressure of the first pressure-stabilizing valve, plugging fluid can be injected into the fracture simulation system 5 and precisely controlled. A predetermined pressure value is then applied to simulate the plugging process under different operating conditions, thereby simulating the impact of downhole pressure fluctuations on the stability of the plugging layer.

[0030] Furthermore, the base liquid displacement system 3 includes a third air compressor, a third pressure-stabilizing gas tank, a third pressure-stabilizing valve, a base liquid container, and a third valve, which are connected in sequence. The lower end of the base liquid container is connected to the lower port 111, and the upper end is connected to the base liquid circulation system 4. By adjusting the pressure value of the third pressure-stabilizing valve, the injection of base liquid is precisely controlled to simulate the base liquid flow process under excitation pressure or suction pressure conditions.

[0031] Furthermore, the plugging fluid circulation system 2 includes a second valve, a second flowmeter, and a second check valve connected in sequence; the base fluid circulation system 4 includes a fourth valve, a fourth flowmeter, and a fourth check valve connected in sequence. The combination of the plugging fluid circulation system 2 and the base fluid circulation system 4 simulates the effect of shearing during the circulation of drilling fluid on the properties of the plugging material, ensuring accurate assessment of the dynamic plugging effect of the plugging formula under actual drilling conditions.

[0032] Furthermore, the base liquid return system 7 includes a seventh air compressor, a seventh pressure-stabilizing gas tank, a seventh pressure-stabilizing valve, a return liquid container and a seventh valve connected in sequence. The lower end of the return liquid container is connected to the right port 114, which is used to simulate the base liquid return process under suction pressure conditions.

[0033] Furthermore, the working fluid loss system 6 includes a sixth valve, a sixth flowmeter and a sixth lost fluid recovery container connected in sequence, which are used to record the leakage flow of the working fluid; the working fluid overflow system 8 includes an eighth valve, an eighth flowmeter and an eighth lost fluid recovery container connected in sequence, which are used to record the overflow flow of the working fluid.

[0034] It should be noted that the working process of the experimental integration system provided by the present invention is:

[0035] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, keep the working fluid loss system 6 in a normally open state, and record the base fluid loss flow rate and circulation flow rate before plugging;

[0036] Step 2: injecting plugging liquid into the plugging liquid container, placing a pressure-sensitive film in the pressure-sensitive film area 122, adjusting the pressure of the first pressure-stabilizing valve to a predetermined experimental value, recording the plugging liquid loss flow rate after plugging via the working fluid loss system 6, and monitoring the plugging process and the color change of the pressure-sensitive film in real time with a high-speed camera 9. The strength of the plugging material deposit is determined based on the color, and the plugging effect of the plugging formula is quantitatively evaluated.

[0037] Step 3: Close the plugging liquid displacement system 1, open the base liquid displacement system 3, adjust the pressure of the third pressure regulating valve to simulate the excitation pressure, record the leakage flow and evaluate the plugging effect;

[0038] Step 4: Close the plugging liquid displacement system 1, open the base liquid flowback system 7, adjust the pressure of the seventh pressure regulating valve to simulate the suction pressure, record the overflow flow rate and evaluate the plugging effect;

[0039] Step 5: Open the plugging liquid circulation system 2, record the leakage flow and circulation flow after plugging, and evaluate the crack plugging effect of different while-drilling plugging formulas.

[0040] Through the above steps, the present invention realizes the comprehensive simulation and quantitative evaluation of the working fluid loss process when no plugging operation is performed, the process of plugging cracks while drilling is stopped using different plugging formulas, the process of plugging cracks while drilling is stopped under exciting pressure, the process of plugging cracks while drilling is stopped under suction pressure, and the plugging process of the plugging formula while drilling under drilling fluid circulation conditions.

[0041] Example 2

[0042] On the basis of Example 1, the experimental integrated system provided by the present invention was used to simulate the working fluid loss process when no plugging operation was performed, specifically:

[0043] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, and keep the working fluid loss system 6 in a normally open state;

[0044] Step 2: inject base liquid into the base liquid container, turn on the third air compressor, adjust the pressure of the third pressure regulating valve to the predetermined experimental value, record the base liquid leakage flow rate and circulation flow rate before plugging through the working liquid leakage system 6 and the base liquid circulation system 4, and determine the working liquid leakage and circulation volume before the plugging operation;

[0045] Step 3: disassemble, clean, and reassemble the crack simulation system 5.

[0046] Example 3

[0047] On the basis of Example 1, the experimental integrated system provided by the present invention was used to simulate the process of stopping drilling and plugging cracks using different plugging formulas, specifically:

[0048] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, and keep the working fluid loss system 6 in a normally open state;

[0049] Step 2: injecting plugging liquid into the plugging liquid container, placing a pressure-sensitive film in the pressure-sensitive film area 122, turning on the first air compressor, adjusting the pressure of the first pressure-stabilizing valve to the predetermined experimental value, and recording the plugging liquid leakage flow after plugging through the working fluid loss system 6. By changing the plugging formula, the crack plugging effect of different plugging formulas can be evaluated. The crack area 102 and the pressure-sensitive film area 122 during the plugging process are monitored in real time by a high-speed camera 9, and the plugging formation process and the corresponding pressure-sensitive film color change are recorded. The strength of the accumulation formed by the plugging material is determined according to the color, and the plugging effect of the plugging formula is quantitatively evaluated.

[0050] Step 3: disassemble, clean, and reassemble the crack simulation system 5.

[0051] Example 4

[0052] On the basis of Example 1, the experimental integrated system provided by the present invention was used to simulate the process of stopping drilling and plugging cracks under the exciting pressure, specifically:

[0053] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, and keep the working fluid loss system 6 in a normally open state;

[0054] Step 2: inject plugging liquid into the plugging liquid container, turn on the first air compressor, adjust the pressure of the first pressure-stabilizing valve to the experimental predetermined value, record the plugging liquid leakage flow after plugging through the working fluid loss system 6, close the plugging liquid displacement system 1, turn on the base liquid displacement system 3, adjust the pressure of the third pressure-stabilizing valve to simulate the excitation pressure, record the leakage flow under the excitation pressure condition through the working fluid loss system 6, and evaluate the crack plugging effect under different excitation pressures by changing the pressure. Use the high-speed camera 9 to monitor the crack simulation system 5 in the plugging process in real time, record the plugging formation process and the corresponding pressure-sensitive film color change, determine the strength of the accumulation body formed by the plugging material according to the color, and quantitatively evaluate the plugging effect of the plugging formula;

[0055] Step 3: disassemble, clean, and reassemble the crack simulation system 5.

[0056] Example 5

[0057] On the basis of Example 1, the experimental integrated system provided by the present invention was used to simulate the process of stopping drilling and plugging cracks under suction pressure, specifically:

[0058] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, and keep the working fluid loss system 6 in a normally open state;

[0059] Step 2: inject plugging liquid into the plugging liquid container, turn on the first air compressor, adjust the pressure of the first pressure-stabilizing valve to the experimental preset value, record the plugging liquid loss flow after plugging through the working fluid loss system 6, close the plugging liquid displacement system 1, turn on the base liquid return system 7, adjust the pressure of the seventh pressure-stabilizing valve to simulate the suction pressure, and record the overflow flow under the suction pressure condition through the working fluid overflow system 8. By changing the pressure, the crack plugging effect under different suction pressures can be evaluated. The crack simulation system 5 in the plugging process is monitored in real time by a high-speed camera 9, and the plugging formation process and the corresponding pressure-sensitive film color change are recorded. The strength of the accumulation body formed by the plugging material is determined according to the color, and the plugging effect of the plugging formula is quantitatively evaluated.

[0060] Step 3: disassemble, clean, and reassemble the crack simulation system 5.

[0061] Example 6

[0062] On the basis of Example 1, the experimental integrated system provided by the present invention is used to simulate the plugging process of the while-drilling plugging formula under drilling fluid circulation conditions, specifically:

[0063] Step 1: Assemble the experimental integrated system, remove the air in the fracture simulation system 5 through the base fluid displacement system 3, and keep the working fluid loss system 6 in a normally open state;

[0064] Step 2: inject plugging liquid into the plugging liquid container, turn on the first air compressor, adjust the pressure of the first pressure-stabilizing valve to the predetermined experimental value, turn on the plugging liquid circulation system 2, and record the plugging liquid loss flow and circulation flow after plugging through the working fluid loss system 6 and the plugging liquid circulation system 2. By changing the plugging liquid, the crack plugging effect of different while-drilling plugging formulas can be evaluated. The crack simulation system 5 during the plugging process is monitored in real time by a high-speed camera 9, and the plugging formation process and the corresponding color change of the pressure-sensitive film are recorded. The strength of the accumulation formed by the plugging material is determined according to the color, and the plugging effect of the plugging formula is quantitatively evaluated.

[0065] Step 3: disassemble, clean, and reassemble the crack simulation system 5.

[0066] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0067] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integrated experimental system for simulating the structure and strength of a plugging layer under pressure fluctuations, characterized in that: include: A fracture simulation system (5), wherein the upper end of the fracture simulation system (5) is connected to a plugging liquid circulation system (2) and a base liquid circulation system (4), the lower end of the fracture simulation system (5) is connected to a plugging liquid displacement system (1) and a base liquid displacement system (3), the left end of the fracture simulation system (5) is connected to a working fluid overflow system (8), the right end of the fracture simulation system (5) is connected to a working fluid loss system (6) and a base liquid return system (7), and the fracture simulation system (5) is electrically connected to a high-speed camera (9).

2. The experimental integration system according to claim 1, characterized in that: The crack simulation system (5) comprises a first crack body (10), a sealing rigid body (11) and a second crack body (12) connected in sequence, wherein the first crack body (10) and the second crack body (12) are both made of organic glass.

3. The experimental integration system according to claim 2, characterized in that: The first crack body (10), the sealing rigid body (11), and the second crack body (12) are all provided with a plurality of bolt holes (101, 112, 121), and the plurality of bolt holes (101, 112, 121) are arranged in a ring shape. A crack area (102) is provided on the surface of the first crack body (10) close to the sealing rigid body (11), and a pressure-sensitive adhesive area (122) is provided on the surface of the second crack body (12) close to the sealing rigid body (11).

4. The experimental integration system according to claim 3, characterized in that: The sealing rigid body (11) is provided with a lower port (111), a right port (114), an upper port (115) and a left port (116) whose axes are perpendicular to the axes of the bolt holes (101, 112, 121); the plugging liquid circulation system (2) and the base liquid circulation system (4) are both connected to the upper port (115); the working fluid loss system (6) is connected to the right port (114); and the working fluid overflow system (8) is connected to the left port (116).

5. The experimental integration system according to claim 4, characterized in that: Both sides of the sealing rigid body (11) are connected with sealing rings (113).

6. The experimental integration system according to claim 4, characterized in that: The plugging liquid displacement system (1) comprises a first air compressor, a first pressure-stabilizing gas tank, a first pressure-stabilizing valve, a plugging liquid container, and a first valve, which are connected in sequence. The lower end of the plugging liquid container is connected to the lower port (111), and the upper end is connected to the plugging liquid circulation system (2).

7. The experimental integration system according to claim 4, characterized in that: The base liquid displacement system (3) comprises a third air compressor, a third pressure-stabilizing gas tank, a third pressure-stabilizing valve, a base liquid container and a third valve connected in sequence; the lower end of the base liquid container is communicated with the lower port (111), and the upper end is connected to the base liquid circulation system (4).

8. The experimental integration system according to claim 4, characterized in that: The plugging liquid circulation system (2) comprises a second valve, a second flow meter and a second one-way valve connected in sequence; the base liquid circulation system (4) comprises a fourth valve, a fourth flow meter and a fourth one-way valve connected in sequence.

9. The experimental integration system according to claim 4, characterized in that: The base liquid return system (7) comprises a seventh air compressor, a seventh pressure-stabilizing gas tank, a seventh pressure-stabilizing valve, a return liquid container and a seventh valve connected in sequence, and the lower end of the return liquid container is communicated with the right port (114).

10. The experimental integration system according to claim 4, characterized in that: The working fluid loss system (6) comprises a sixth valve, a sixth flow meter and a sixth lost fluid recovery container connected in sequence; the working fluid overflow system (8) comprises an eighth valve, an eighth flow meter and an eighth lost fluid recovery container connected in sequence.

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