Experimental device for simulating well killing effect of rescue well at different communication points

Abstract

The invention relates to the field of petroleum drilling engineering, in particular to an experimental device for simulating the well killing effect of a rescue well under different communication points. According to the technical scheme, a visual transparent outer shaft, an annular inner shaft, an upper plug and a lower plug form a shaft unit, a simulated rescue well, an angle sensor, a universal connector, an angle adjusting mechanism and a steel hoop form a rescue well unit, and an upper liquid outlet pipeline, a liquid storage tank, a stirrer, a screw pump and a kill fluid injection pipeline form a kill fluid injection unit. The air compressor, the pressure reducing valve, the pressure stabilizing valve, the gas flow regulator, the one-way valve and the gas inlet pipeline form a gas injection unit. The device has the beneficial effects that the simulation rescue well is connected through the universal connector and the angle adjusting mechanism, the complex flowing process of gas invasion and pressure back in a shaft can be simulated when the rescue well at different angles is killed, and the gas-liquid flowing rules of the rescue well at different angles, well killing fluid with different viscosities and at different flow speeds can be clearly observed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling engineering, in particular to an experimental device for simulating the well killing effect of a relief well under different communication points. BACKGROUND

[0002] In recent years, deep water and deep layers have become new positions for oil and gas exploration in China, and deep gas reservoirs often face high temperature and high pressure, complex formation conditions, and high probability of drilling abnormal pressure formations. Once the drilling fluid column pressure is lower than the formation pore pressure, the formation gas will invade the wellbore. In the face of extreme conditions such as inability to establish normal circulation, overflow and loss, and high hydrogen sulfide content, conventional well killing methods often fail. Therefore, as a key unconventional well control technology, the pressure return method plays an irreplaceable role in the disposal of overflow in deep wells.

[0003] During the well killing process of the pressure return method, the well killing fluid is pumped from the wellhead annulus, the liquid phase flows to the bottom of the well, and the invading gas at the bottom of the well moves upward, forming a gas-liquid two-phase countercurrent in the annulus. The two phases impact each other like a corner force. If the invading gas successfully changes direction and moves to the bottom of the well with the well killing fluid under the action of the well killing fluid, and finally all of them are pressed back to the formation, the well killing by the pressure return method is successful. In the face of special circumstances, directional drilling technology is needed to drill a relief well to provide a new controllable channel for the injection of well killing fluid. At present, the experimental research on well killing by the pressure return method lacks research on the influence of the injection angle of well killing fluid on the gas-liquid two-phase countercurrent and well killing effect.

[0004] A team of the present unit applied for a Chinese patent No. CN201810004155.0 in 2018, with the patent name of "Relief well killing simulation experiment device and method", which includes: an experimental wellbore, a gas injection system, a liquid injection system, a gas-liquid separation system, a back pressure control system and a liquid discharge system; the gas injection system and the liquid injection system inject gas and liquid into the experimental wellbore respectively, the experimental wellbore simulates the gas-liquid two-phase flow condition in the accident well, the mixed fluid flows out of the experimental wellbore and is separated into gas and liquid by the gas-liquid separation system, the back pressure control system controls the size of the wellhead back pressure, and after the experiment is completed, the liquid discharge system discharges the liquid; the gas injection system automatically adjusts the gas injection speed according to the change of the bottom hole pressure of the experimental wellbore, truly reflects the process of continuously reducing gas well production in the well killing process, and thus realizes the coupling simulation of the wellbore and the formation. The present application provides a set of relief well killing simulation device and method, which can simulate the change of the bottom hole pressure of the accident well under different well killing parameters, and provides model parameters and experimental data for the design and research of relief well killing construction parameters. The deficiency of the present application is that it is designed for a fixed communication point of the relief well, and cannot meet the design of relief well killing parameters under multiple different communication points. SUMMARY

[0005] The experimental device for simulating the well killing effect of a rescue well under different communication points aims at the above-mentioned defects in the prior art, and can realize the well killing process simulation of the rescue well under different communication points, and can clearly observe the gas-liquid flow law under different angle rescue wells, different viscosity well killing fluids and different flow rates.

[0006] The experimental device for simulating the well killing effect of a rescue well under different communication points comprises an air compressor (1), a pressure reducing valve (2), a pressure stabilizing valve (3), a gas flow regulating meter (4), a check valve (5), an air inlet pipeline (7), a lower plug (8), a visible transparent outer wellbore (12), an annular inner wellbore (15), an upper plug (17), an upper liquid outlet (18), an upper liquid outlet pipeline (21), a liquid storage tank (23), a stirrer (24), a screw pump (25), a well killing fluid injection pipeline (28), a simulated rescue well (29), an angle sensor (30), a universal joint (31), an angle adjusting mechanism (32), a steel clamp (33), a lower liquid outlet (34), a lower liquid outlet pipeline (35), a high-speed camera (36) and a computer (37), The visible transparent outer wellbore (12), the annular inner wellbore (15), the upper plug (17) and the lower plug (8) constitute a wellbore unit, the annular inner wellbore (15) is arranged in the inner cavity of the visible transparent outer wellbore (12), the upper plug (17) is arranged at the top of the visible transparent outer wellbore (12), the upper liquid outlet (18) is arranged on one side of the top, the lower plug (8) is arranged at the bottom of the visible transparent outer wellbore (12), the lower liquid outlet (34) is arranged on one side of the bottom, and the high-speed camera (36) and the computer (37) are arranged on one side of the visible transparent outer wellbore (12); The simulated rescue well (29), the angle sensor (30), the universal joint (31), the angle adjusting mechanism (32) and the steel clamp (33) constitute a rescue well unit, one end of the simulated rescue well (29) is connected to the outer wall of the visible transparent outer wellbore (12) through the universal joint (31), the other end of the simulated rescue well (29) is connected to the well killing fluid injection unit through the well killing fluid injection pipeline (28), the angle adjusting mechanism (32) is arranged at the lower side of the middle part of the simulated rescue well (29), the angle sensor (30) and the steel clamp (33) are arranged on the outer wall of the simulated rescue well (29), the angle adjusting mechanism (32) is controlled by the computer (37), and different angle rescues are realized in combination with the angle sensor (30); The upper liquid outlet pipeline (21), the liquid storage tank (23), the stirrer (24), the screw pump (25), the well killing fluid injection pipeline (28) constitute a well killing fluid injection unit, the inner cavity of the liquid storage tank (23) is provided with the stirrer (24), the lower end liquid outlet of the liquid storage tank (23) is connected to the outer end of the simulated rescue well (29) through the screw pump (25) and the well killing fluid injection pipeline (28), and the upper end of the liquid storage tank (23) is connected to the upper liquid outlet (18) through the upper liquid outlet pipeline (21). The air compressor (1), the pressure reducing valve (2), the pressure stabilizing valve (3), the gas flow regulating meter (4), the one-way valve (5), and the air inlet pipeline (7) constitute an air injection unit, the output end of the air compressor (1) is connected to the lower plug (8) of the visible transparent outer wellbore (12) through the air inlet pipeline (7) in sequence and is connected to the one-way valve (5) through the pressure reducing valve (2), the pressure stabilizing valve (3) and the gas flow regulating meter (4).

[0007] Preferably, the lower part of the visible transparent outer wellbore (12) is provided with the wellbore lower metal section (10), the upper part of the visible transparent outer wellbore (12) is provided with the wellbore upper metal section (19), the lower pressure sensor (9) is arranged on one side of the wellbore lower metal section (10), and the upper pressure sensor (16) is arranged on one side of the wellbore upper metal section (19).

[0008] Preferably, the upper side of the visible transparent outer wellbore (12) is provided with the LED light source (14), and one or more visible transparent outer wellbores (12) are connected to form a group through the connecting flange (13).

[0009] Preferably, the lower plug (8) is provided with the air inlet needle tube (11), the lower end of the air inlet needle tube (11) is connected to the air inlet pipeline (7), and the upper end of the air inlet needle tube (11) is located in the annulus between the visible transparent outer wellbore (12) and the annular inner wellbore (15).

[0010] Preferably, the air inlet pipeline (7) is further provided with the gas flow meter (6), and the gas flow meter (6) is located at the outlet end of the one-way valve (5).

[0011] Preferably, the upper liquid outlet pipeline (21) is provided with the first liquid flow meter (20) and the liquid outlet valve (22), and the well killing fluid injection pipeline (28) is provided with the second liquid flow meter (27).

[0012] Preferably, one side of the screw pump (25) is provided with the screw pump control panel (26), and the screw pump control panel (26) is connected to the computer (37) through a signal line.

[0013] Preferably, the angle adjusting mechanism (32) and the high-speed camera (36) are respectively connected to the computer (37) through signal lines.

[0014] Preferably, the visual transparent outer wellbore (12) is made of acrylic material, with an outer diameter of 100mm and an inner diameter of 80mm, and the annular inner wellbore (15) is made of acrylic material, with an outer diameter of 40mm.

[0015] Compared with the prior art, the application has the following advantages: Firstly, the application introduces the "rescue well angle" as a key variable into the pressure return method experiment, which can simulate the complex flow process of gas invasion and pressure return in the wellbore when the well is being killed at different angles, and can explore the influence of different gas-liquid flow rates, different densities and viscosities of killing fluids on the killing effect of empty wellbore and non-empty wellbore, thereby filling the gap in the research on the influence mechanism of inclined injection jet on gas-liquid countercurrent, and providing a certain reference for enriching the pressure return method well killing parameter design. Secondly, the device is designed in a modular manner, has a simple structure and low assembly difficulty, can realize multifunctional experiments through simple modification, the outer pipe of the simulated wellbore is made of transparent acrylic material, the whole process of gas invasion and pressure return can be clearly captured by using a high-speed camera, and the gas-liquid two-phase flow condition and the device state can be judged by the naked eye during the experiment, so that researchers can make adjustments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall connection of the application; Figure 2 is a schematic diagram of the connection of the simulated rescue well; In the above figure: air compressor (1), pressure reducing valve (2), pressure stabilizing valve (3), gas flow regulating meter (4), check valve (5), gas flow meter (6), air inlet pipeline (7), lower plug (8), lower pressure sensor (9), lower metal section of wellbore (10), air inlet needle pipe (11), visual transparent outer wellbore (12), connection flange (13), LED light source (14), annular inner wellbore (15), upper pressure sensor (16), upper plug (17), upper liquid outlet (18), upper metal section of wellbore (19), first liquid flow meter (20), upper liquid outlet pipeline (21), liquid outlet valve (22), liquid storage tank (23), stirrer (24), screw pump (25), screw pump control panel (26), second liquid flow meter (27), killing fluid injection pipeline (28), simulated rescue well (29), angle sensor (30), universal joint (31), angle adjusting mechanism (32), steel clamp (33), lower liquid outlet (34), lower liquid outlet pipeline (35), high-speed camera (36), computer (37). DETAILED DESCRIPTION

[0017] The preferred embodiments of the application will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0018] Embodiment 1, refer to Figure 1 and Figure 2 The application refers to an experimental device for simulating the effect of killing well of rescue well under different communication points, which comprises an air compressor (1), a pressure reducing valve (2), a pressure stabilizing valve (3), a gas flow regulating meter (4), a one-way valve (5), an air inlet pipeline (7), a lower plug (8), a visible transparent outer wellbore (12), an annular inner wellbore (15), an upper plug (17), an upper outlet (18), an upper outlet pipeline (21), a liquid storage tank (23), a stirrer (24), a screw pump (25), a killing fluid injection pipeline (28), a simulated rescue well (29), an angle sensor (30), a universal joint (31), an angle adjusting mechanism (32), a steel clamp (33), a lower outlet (34), a lower outlet pipeline (35), a high-speed camera (36), and a computer (37), The visible transparent outer wellbore (12), the annular inner wellbore (15), the upper plug (17), and the lower plug (8) constitute a wellbore unit, the annular inner wellbore (15) is installed in the inner cavity of the visible transparent outer wellbore (12), the upper plug (17) is installed at the top of the visible transparent outer wellbore (12), the upper outlet (18) is installed at one side of the top, the lower plug (8) is installed at the bottom of the visible transparent outer wellbore (12), the lower outlet (34) is provided at one side of the bottom, the high-speed camera (36) and the computer (37) are installed on one side of the visible transparent outer wellbore (12); The simulated rescue well (29), the angle sensor (30), the universal joint (31), the angle adjusting mechanism (32), and the steel clamp (33) constitute a rescue well unit, one end of the simulated rescue well (29) is connected to the outer wall of the visible transparent outer wellbore (12) through the universal joint (31), the other end of the simulated rescue well (29) is connected to the killing fluid injection unit through the killing fluid injection pipeline (28), the angle adjusting mechanism (32) is installed at the lower side of the middle part of the simulated rescue well (29), the angle sensor (30) and the steel clamp (33) are installed on the outer wall of the simulated rescue well (29), the angle adjusting mechanism (32) is controlled by the computer (37), and different angle rescues are realized in combination with the angle sensor (30); The upper outlet pipeline (21), the liquid storage tank (23), the stirrer (24), the screw pump (25), and the killing fluid injection pipeline (28) constitute a killing fluid injection unit, the stirrer (24) is installed in the inner cavity of the liquid storage tank (23), the lower end outlet of the liquid storage tank (23) is connected to the outer end of the simulated rescue well (29) through the screw pump (25) and the killing fluid injection pipeline (28), and the upper end of the liquid storage tank (23) is connected to the upper outlet (18) through the upper outlet pipeline (21); The air compressor (1), pressure reducing valve (2), pressure stabilizing valve (3), gas flow regulating meter (4), one-way valve (5), and air inlet pipeline (7) form an air injection unit, and the output end of the air compressor (1) is connected to the lower plug (8) of the visible transparent outer shaft (12) through the air inlet pipeline (7) in sequence and connected to the pressure reducing valve (2), the pressure stabilizing valve (3), the gas flow regulating meter (4), and the one-way valve (5).

[0019] The lower part of the visible transparent outer shaft (12) is provided with a shaft lower metal section (10), and the upper part is provided with a shaft upper metal section (19); a lower pressure sensor (9) is arranged on one side of the shaft lower metal section (10), and an upper pressure sensor (16) is arranged on one side of the shaft upper metal section (19).

[0020] An LED light source (14) is arranged on the upper side of the visible transparent outer shaft (12) for convenient observation.

[0021] An air inlet needle tube (11) is arranged in the lower plug (8), the lower end of the air inlet needle tube (11) is connected to the air inlet pipeline (7), and the upper end of the air inlet needle tube (11) is located in the annulus between the visible transparent outer shaft (12) and the annular inner shaft (15).

[0022] A gas flow meter (6) is further arranged on the air inlet pipeline (7), and the gas flow meter (6) is located at the outlet end of the one-way valve (5).

[0023] A first liquid flow meter (20) and a liquid outlet valve (22) are arranged on the upper liquid outlet pipeline (21), and a second liquid flow meter (27) is arranged on the well killing fluid injection pipeline (28).

[0024] One side of the screw pump (25) is provided with a screw pump control panel (26), and the screw pump control panel (26) is connected to the computer (37) through a signal line.

[0025] The angle adjusting mechanism (32) and the high-speed camera (36) are respectively connected to the computer (37) through signal lines.

[0026] The visible transparent outer shaft (12) is made of acrylic material, has an outer diameter of 100 mm and an inner diameter of 80 mm, and the annular inner shaft (15) is made of acrylic material and has an outer diameter of 40 mm.

[0027] The use method of the experimental device for simulating the well killing effect of a rescue well at different communication points mentioned in the application comprises the following process: S1, check the air tightness of the device, repeatedly inject air and clean the well shaft unit with clean water for 2-3 times, ensure that the well killing fluid is not contaminated, and check whether the performance of the flow meter is normal; S2, open the air compressor 1, adjust the precision pressure reducing valve 2, the pressure stabilizing valve 3, the gas flow regulating meter 4, ensure that the gas is injected with stable flow; S3, open the screw pump 25, make the screw pump pump the wellbore unit stably by setting the frequency, realize the fixed injection displacement of the liquid phase; S4, after the liquid phase injection flow is stable, open the LED light source 14, adjust the focal length of the high-speed camera 36 and the intensity of the LED light source 14, vertically shoot the wellbore unit and make the imaging range size appropriate, ensure that the imaging range is as large as possible while ensuring that the bubble morphology is clear and the migration trajectory is clear; after debugging, shoot the bubble migration process under the static liquid phase condition, and record the readings of the gas flow meter 6 and the second liquid flow meter 27; S5, change the opening of the gas flow regulating meter 4 and the motor frequency of the screw pump 25, repeat S1-S4, and carry out well killing experiments under different gas velocities and different liquid velocities; S6, adjust the angle adjusting mechanism 32 of the rescue well to the preset angle θ and fix it, repeat steps S1-S5, and record the bubble migration and pressure return process under different injection angles θ and different gas-liquid flow rates; S7, clean the wellbore, pipeline and liquid storage tank 23, replace the simulated well killing fluid with different densities and viscosities, and repeat the above steps from S1 to record the gas invasion and pressure return process in different density and viscosity well killing fluids; S8, after removing the annular inner tube, repeat the above steps from S1 to record the gas invasion and pressure return process under different angle rescue wells, different gas-liquid flow rates and different well killing fluids in the circular pipe condition.

[0028] In embodiment 2, the application provides an experimental device for simulating the well killing effect of a rescue well under different communication points, which comprises an air compressor (1), a pressure reducing valve (2), a pressure stabilizing valve (3), a gas flow regulating meter (4), a check valve (5), an air inlet pipeline (7), a lower plug (8), a visible transparent outer wellbore (12), an annular inner wellbore (15), an upper plug (17), an upper liquid outlet (18), an upper liquid outlet pipeline (21), a liquid storage tank (23), a stirrer (24), a screw pump (25), a well killing fluid injection pipeline (28), a simulated rescue well (29), an angle sensor (30), a universal joint (31), an angle adjusting mechanism (32), a steel clamp (33), a lower liquid outlet (34), a lower liquid outlet pipeline (35), a high-speed camera (36), a computer (37), The visual transparent outer wellbore (12), the annular inner wellbore (15), the upper plug (17), and the lower plug (8) form a wellbore unit, the annular inner wellbore (15) is installed in the inner cavity of the visual transparent outer wellbore (12), the upper plug (17) is installed at the top of the visual transparent outer wellbore (12), the upper liquid outlet (18) is installed at one side of the top, the lower plug (8) is installed at the bottom of the visual transparent outer wellbore (12), the lower liquid outlet (34) is arranged at one side of the bottom, and the high-speed camera (36) and the computer (37) are installed on one side of the visual transparent outer wellbore (12). The simulated rescue well (29), the angle sensor (30), the universal joint (31), the angle adjusting mechanism (32), and the steel clamp (33) form a rescue well unit, one end of the simulated rescue well (29) is connected to the outer wall of the visual transparent outer wellbore (12) through the universal joint (31), the other end of the simulated rescue well (29) is connected to the well killing liquid injection unit through the well killing liquid injection pipeline (28), the angle adjusting mechanism (32) is installed at the lower side of the middle part of the simulated rescue well (29), the angle sensor (30) and the steel clamp (33) are installed on the outer wall of the simulated rescue well (29), the angle adjusting mechanism (32) is controlled by the computer (37), and different angle rescues are simulated by combining the angle sensor (30). The upper liquid outlet pipeline (21), the liquid storage tank (23), the stirrer (24), the screw pump (25), and the well killing liquid injection pipeline (28) form a well killing liquid injection unit, the stirrer (24) is installed in the inner cavity of the liquid storage tank (23), the lower end liquid outlet of the liquid storage tank (23) is connected to the outer end of the simulated rescue well (29) through the screw pump (25) and the well killing liquid injection pipeline (28), and the upper end of the liquid storage tank (23) is connected to the upper liquid outlet (18) through the upper liquid outlet pipeline (21). The air compressor (1), the pressure reducing valve (2), the pressure stabilizing valve (3), the gas flow adjusting meter (4), the one-way valve (5), and the air inlet pipeline (7) form an air injection unit, the output end of the air compressor (1) is connected to the lower plug (8) of the visual transparent outer wellbore (12) through the air inlet pipeline (7) in sequence and through the pressure reducing valve (2), the pressure stabilizing valve (3), the gas flow adjusting meter (4), and the one-way valve (5).

[0029] The difference between the embodiment 1 and the embodiment 2 is that: In the embodiment, one or more visual transparent outer wellbores (12) are connected to form a group through the connecting flanges (13), so that the installation and fixation are facilitated.

[0030] The above description is only some preferred embodiments of the present application, and any skilled person in the art can modify the above-mentioned technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modification or equivalent transformation according to the technical solutions of the present application is within the scope of protection of the present application.

Claims

1. An experimental device for simulating the effect of killing a relief well at different communication points, characterized in that: The air compressor (1), pressure reducing valve (2), pressure stabilizing valve (3), gas flow regulating meter (4), one-way valve (5), air inlet pipeline (7), lower plug (8), visible transparent outer wellbore (12), annular inner wellbore (15), upper plug (17), upper liquid outlet (18), upper liquid outlet pipeline (21), liquid storage tank (23), agitator (24), screw pump (25), well killing fluid injection pipeline (28), simulated rescue well (29), angle sensor (30), universal joint (31), angle adjusting mechanism (32), steel clamp (33), lower liquid outlet (34), lower liquid outlet pipeline (35), high-speed camera (36), computer (37), ​ The visible transparent outer wellbore (12), annular inner wellbore (15), upper plug (17), and lower plug (8) form a wellbore unit, the annular inner wellbore (15) is installed in the inner cavity of the visible transparent outer wellbore (12), the upper plug (17) is installed at the top of the visible transparent outer wellbore (12), the upper liquid outlet (18) is installed on one side of the top, the lower plug (8) is installed at the bottom of the visible transparent outer wellbore (12), the lower liquid outlet (34) is provided on one side of the bottom, the high-speed camera (36) and the computer (37) are installed on one side of the visible transparent outer wellbore (12); The simulated rescue well (29), angle sensor (30), universal joint (31), angle adjusting mechanism (32), and steel clamp (33) form a rescue well unit, one end of the simulated rescue well (29) is connected to the outer wall of the visible transparent outer wellbore (12) through the universal joint (31), the other end of the simulated rescue well (29) is connected to the well killing fluid injection unit through the well killing fluid injection pipeline (28), the angle adjusting mechanism (32) is installed at the lower side of the middle part of the simulated rescue well (29), the angle sensor (30) and the steel clamp (33) are installed on the outer wall of the simulated rescue well (29), the angle adjusting mechanism (32) is controlled by the computer (37), and different angle rescues are simulated in combination with the angle sensor (30); The upper liquid outlet pipeline (21), liquid storage tank (23), agitator (24), screw pump (25), and well killing fluid injection pipeline (28) form a well killing fluid injection unit, the agitator (24) is installed in the inner cavity of the liquid storage tank (23), the lower end liquid outlet of the liquid storage tank (23) is connected to the outer end of the simulated rescue well (29) through the screw pump (25) and the well killing fluid injection pipeline (28), and the upper end of the liquid storage tank (23) is connected to the upper liquid outlet (18) through the upper liquid outlet pipeline (21); The air compressor (1), pressure reducing valve (2), pressure stabilizing valve (3), gas flow regulating meter (4), one-way valve (5), and air inlet pipeline (7) form a gas injection unit, the output end of the air compressor (1) is connected to the lower plug (8) of the visible transparent outer wellbore (12) through the air inlet pipeline (7) in sequence and through the pressure reducing valve (2), the pressure stabilizing valve (3), the gas flow regulating meter (4), and the one-way valve (5).

2. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 1, characterized in that: The lower part of the visual transparent outer wellbore (12) is provided with a wellbore lower metal section (10), and the upper part of the visual transparent outer wellbore (12) is provided with a wellbore upper metal section (19). A lower pressure sensor (9) is installed on one side of the wellbore lower metal section (10), and an upper pressure sensor (16) is installed on one side of the wellbore upper metal section (19).

3. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 2, characterized in that: An LED light source (14) is installed on the upper side of the visual transparent outer wellbore (12), and a plurality of visual transparent outer wellbores (12) are connected by a connecting flange (13) to form a group.

4. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 3, characterized in that: An air inlet needle tube (11) is installed in the lower plug (8), the lower end of the air inlet needle tube (11) is connected to an air inlet pipeline (7), and the upper end of the air inlet needle tube (11) is located in the annulus between the visual transparent outer wellbore (12) and the annular inner wellbore (15).

5. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 4, characterized in that: A gas flow meter (6) is also installed on the air inlet pipeline (7), and the gas flow meter (6) is located at the outlet end of the one-way valve (5).

6. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 5, characterized in that: A first liquid flow meter (20) and a liquid outlet valve (22) are installed on the upper liquid outlet pipeline (21), and a second liquid flow meter (27) is installed on the well killing fluid injection pipeline (28).

7. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 6, characterized in that: A screw pump control panel (26) is arranged on one side of the screw pump (25), and the screw pump control panel (26) is connected to the computer (37) through a signal line.

8. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 1, characterized in that: The angle adjusting mechanism (32) and the high-speed camera (36) are respectively connected to the computer (37) through signal lines.

9. The experimental device for simulating the effect of killing a relief well at different communication points according to claim 1, characterized in that: The visual transparent outer wellbore (12) is made of acrylic material, with an outer diameter of 100 mm and an inner diameter of 80 mm, and the annular inner wellbore (15) is also made of acrylic material, with an outer diameter of 40 mm.

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