A fishbone well injection and production experimental device

Abstract

The present application provides a fishbone well injection and production experimental device. The device includes a visualization model, a fishbone well, an injection well, and a locking switch, wherein the inner cavity of the visualization model is used to fill quartz sand, and the injection well and the fishbone well are respectively arranged in the inner cavity of the visualization model, for injecting water / oil into and discharging water / oil from the inner cavity of the visualization model. The fishbone well includes a main wellbore, each branch wellbore, a main wellbore circulation channel, each branch wellbore circulation channel, and perforations. The main wellbore is connected to the main wellbore circulation channel, the branch wellbore is connected to the branch wellbore circulation channel, and the branch wellbore is connected to the main wellbore at a preset angle. A plurality of perforations are respectively provided on the main wellbore and the branch wellbore barrel. The locking switch is respectively connected to the main and branch wellbore circulation channels, and is used to control the flow rate at the production end of the main and branch wellbore of the fishbone well. The device of the present application is convenient for distinguishing the water-seeking time and contribution of the main and branch wellbores, and the perforation position and number are controllable, which can meet the requirements of different experimental conditions.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas field injection and production, and in particular to a fishbone well injection and production experimental device. Background Art

[0002] A fishbone well, also known as a fishbone-shaped horizontal branch well, is a type of multi-lateral well. It consists of a main well and branch wells. Fishbone well technology is a key method in oil and gas field development, reducing production costs per ton of oil, improving drainage efficiency, and ultimately increasing oil recovery.

[0003] Before implementing fishbone well development on-site, indoor physical simulation experiments are generally conducted. Existing injection-production experimental setups used in these experiments include a fishbone well model, which simulates actual oil and gas wells. In existing fishbone well models, the main and branch wellbores share a common flow channel, making it difficult to determine the water breakthrough time and contribution of each wellbore. Furthermore, the main and branch wellbores have limited perforation locations and numbers. Changing experimental conditions necessitates replacing the fishbone wells with the perforation locations and numbers required, making it difficult to meet varying experimental requirements. Summary of the Invention

[0004] The present application provides a fishbone well injection and production experimental device to solve the problems in the prior art that the main wellbore and branch wellbore of the fishbone well model share the main wellbore circulation channel, making it difficult to judge the water breakthrough time and contribution of the main wellbore and the branch wellbore, and the perforation positions and numbers of the main wellbore and the branch wellbore are limited, which cannot meet the requirements of different experimental conditions.

[0005] In a first aspect, the present application provides a fishbone well injection-production experimental device, comprising a visualization model, a fishbone well, an injection well, and a locking switch;

[0006] The inner cavity of the visualization model is filled with quartz sand;

[0007] The injection well is provided in the inner cavity of the visualization model and is used to inject water and oil into the inner cavity of the visualization model;

[0008] The fishbone well is arranged in the inner cavity of the visualization model, and is used to discharge water and oil from the inner cavity of the visualization model. The fishbone well includes a main wellbore, at least one branch wellbore, a main wellbore circulation channel, at least one branch wellbore circulation channel, and perforations. The main wellbore is connected to the main wellbore circulation channel, the branch wellbore is connected to the branch wellbore circulation channel, the branch wellbore is connected to the main wellbore at a preset angle, and a plurality of perforations are respectively arranged on the main wellbore barrel and the branch wellbore barrel;

[0009] The locking switch is connected to the fishbone well and is used to control the flow of water and oil at the output end of the fishbone well.

[0010] Optionally, the visualization model includes a detachable cover plate, which is located on a side of the visualization model. The quartz sand is filled into the inner cavity of the visualization model through the detachable cover plate, and the side is the surface with the smallest area in the visualization model.

[0011] Optionally, at least one branch wellbore circulation channel is provided in the main wellbore circulation channel.

[0012] Optionally, the perforations are evenly distributed at equal distances along the length direction of the main wellbore and the branch wellbore.

[0013] Optionally, the perforation is opened or closed by controlling a rubber plug.

[0014] Optionally, the main shaft circulation channel of the fishbone well and the branch well shaft circulation channel are respectively provided with the locking switch.

[0015] Optionally, the visualization model also includes a visualization window, a cover bolt, a visualization model shell and a shell bolt, the detachable cover is connected to the visualization model shell through the cover bolt, the visualization window is embedded in the top surface of the visualization model shell, and the visualization model shell is connected through the shell bolt.

[0016] Optionally, the detachable cover and the visualization model shell are sealed by a rubber ring.

[0017] Optionally, the device further includes a visualization model support, which is connected to the visualization model and is used to support the visualization model.

[0018] Optionally, the device further includes a rotation fixing switch, which is connected to the visual model bracket and is used to fix the rotation position of the visual model.

[0019] The present application provides a fishbone well injection and production experimental device, which includes a visualization model, a fishbone well, an injection well, and a locking switch. The inner cavity of the visualization model is filled with quartz sand; the injection well is provided in the inner cavity of the visualization model and is used to inject water and oil into the inner cavity of the visualization model; the fishbone well is provided in the inner cavity of the visualization model and is used to discharge water and oil from the inner cavity of the visualization model. The fishbone well includes a main wellbore, at least one branch wellbore, a main wellbore circulation channel, at least one branch wellbore circulation channel, and perforations. The main wellbore is connected to the main wellbore circulation channel, the branch wellbore is connected to the branch wellbore circulation channel, and the branch wellbore is connected to the main wellbore at a preset angle. Multiple perforations are provided on the main wellbore barrel and the branch wellbore barrel, respectively. The locking switch is connected to the fishbone well and is used to control the flow of water and oil at the output end of the fishbone well. The main wellbore and branch wellbore of the fishbone well have their own independent flow channels, which makes it easy to determine the water breakthrough time and contribution of the main well and branch wells. The perforation position and number on the main wellbore and branch wellbore are controllable to meet the requirements of different experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1A A schematic structural diagram of a fishbone well injection-production experimental device provided in Example 1 of the present application;

[0022] Figure 1B A schematic diagram of the structure of a fishbone well provided in Example 1 of the present application;

[0023] Figure 2 A schematic diagram of the structure of a visualization model provided in Example 1 of the present application;

[0024] Figure 3A This is a schematic diagram of the structure of a fishbone well provided in Example 2 of the present application, in which the branch wellbores are located on the same side of the main wellbores;

[0025] Figure 3B This is a schematic diagram of the structure of a fishbone well provided in Example 2 of the present application, in which the branch wellbore is located on the opposite side of the main wellbore;

[0026] Figure 4 A schematic structural diagram of another fishbone well injection-production experimental device provided in an embodiment of the present application.

[0027] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0029] First, let’s explain the terms involved in this application:

[0030] Water breakthrough time: refers to the time when water begins to flow out of the production end of the production well;

[0031] Contribution: refers to the ratio of the number of effective or useful results to the amount of resources consumed, that is, the ratio of output to input, or the ratio of income to expenditure. In this application, it refers to the percentage of oil production from the main wellbore and each branch wellbore in the total production;

[0032] Displacement front: refers to the boundary between the displacing medium (water in this application) and the displaced medium (oil in this application). In this application, it refers to the boundary between water in the visualization model and oil in the visualization model.

[0033] Secondly, it should be noted that in the description of the embodiments of the present invention, terms such as "inside", "upper", "lower", and "top" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] Fishbone well technology is a key method for improving oil and gas field recovery, significantly reducing oil production costs per ton and increasing single-well production. Resembling a fishbone, a fishbone well features multiple lateral wellbores connected at fixed angles to the main wellbore. Its production-enhancing mechanism increases the exposed area of ​​the reservoir, thereby increasing the drainage area and the contact area between the reservoir and the wellbore, thereby improving oil and gas recovery.

[0035] During actual mining operations, the interaction between oil and water can lead to unclear distribution of remaining oil and gas within a field. This can affect the extraction of remaining oil and gas within the field and subsequent well pattern deployment. Therefore, before implementing fishbone well development on site, indoor physical simulation experiments are typically conducted to clarify the characteristics of oil and water movement.

[0036] Existing injection-production experimental devices used for indoor physical simulation experiments include physical models and fishbone well models. The fishbone well model simulates actual oil and gas wells, while the physical model is filled with quartz sand to simulate actual reservoir formations. In existing fishbone well models, the main and branch wellbores share a common main wellbore flow channel, making it difficult to determine the water breakthrough time and contribution of the main and branch wellbores. Furthermore, the main and branch wellbores have limited perforation locations and numbers. Changing experimental conditions requires replacing the fishbone wells to match the desired perforation locations and numbers, making it difficult to adapt to changing experimental conditions.

[0037] In addition, in the prior art, when filling quartz sand on a physical model, the filling is performed through the surface with the largest opening area on the model. However, this filling method easily causes uneven compaction of the quartz sand in the model.

[0038] Therefore, in response to the above-mentioned technical problems arising from the existing injection and production experimental devices, the present application proposes a new fishbone well injection and production experimental device. The fishbone well injection and production experimental device in the present application includes a visualization model, a fishbone well, an injection well, a locking switch, etc., wherein the inner cavity of the visualization model is filled with quartz sand, and the injection well is arranged in the inner cavity of the visualization model, for injecting water and oil into the inner cavity of the visualization model. The fishbone well is arranged in the inner cavity of the visualization model, for discharging water and oil from the inner cavity of the visualization model, wherein the fishbone well includes a main wellbore and each branch wellbore, and the flow channels of each wellbore are independent of each other. A locking switch is also provided at the output end of the wellbore flow channel, and the water / oil output of the fishbone well is controlled by the locking switch, so as to facilitate the comparison of the water breakthrough time and contribution difference of the main well and the branch well by changing the production conditions. A certain number of perforations are provided on the main wellbore and each branch wellbore, which can meet the requirements for the position and number of perforations under different experimental conditions.

[0039] In addition, the visualization model includes a removable cover plate, through which the inner cavity of the visualization model is filled with quartz sand. The removable cover plate is located on the side of the visualization model to facilitate compaction of the evenly filled quartz sand.

[0040] The device of the present application can be used to simulate various types of fishbone well oil and gas reservoirs, such as fractured oil and gas reservoirs, low permeability oil and gas reservoirs, etc. It can be understood that the injection and production experimental device provided by the present application has application scenarios including but not limited to the above, and the listed scenarios are not intended to limit the present application.

[0041] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0042] Figure 1A This is a structural diagram of a fishbone well injection and production experimental device provided in Example 1 of this application, as shown in FIG. Figure 1A As shown, the device includes a visualization model 101 , a fishbone well 102 , an injection well 103 , and a locking switch 104 .

[0043] The inner cavity of the visualization model 101 is filled with quartz sand to simulate the reservoir environment.

[0044] The fishbone well 102 is disposed in the inner cavity of the visualization model 101 , with its output end extending outward from the visualization model 101 , for discharging water and oil from the inner cavity of the visualization model 101 .

[0045] The injection well 103 is provided in the inner cavity of the visual model 101 , with its injection end extending outward from the visual model 101 , and is used for injecting water and oil into the inner cavity of the visual model.

[0046] A locking switch 104 is also provided at the output end of the fishbone well 102 for controlling the water / oil output of the fishbone well 102 .

[0047] The following briefly describes the structure of the fishbone well 102:

[0048] like Figure 1B As shown, Figure 1B This is a schematic diagram of the structure of a fishbone well provided in Example 1 of the present application. The fishbone well includes a main wellbore 1021 , at least one branch wellbore 1022 , a main wellbore circulation channel 1023 , at least one branch wellbore circulation channel 1024 , and perforations 1025 .

[0049] The main wellbore 1021 is connected to the main wellbore circulation channel 1023, and the branch wellbore 1022 is connected to the branch wellbore circulation channel 1024. The main wellbore circulation channel 1023 and the branch wellbore circulation channel 1024 provide flow channels for the liquid flowing into the main wellbore and the branch wellbore respectively. The branch wellbore 1022 is connected to the main wellbore 1021 at a preset angle α. A plurality of perforations 1025 are respectively provided on the barrel of the main wellbore 1021 and the barrel of the branch wellbore 1022. The opening and closing of the perforations 1025 can be controlled by a rubber plug. The position and number of the perforations 1025 can be determined according to experimental requirements.

[0050] A locking switch 104 is also provided at the output end of the fishbone well 102 for controlling the water / oil output at the output end of the fishbone well 102 .

[0051] In the above-mentioned embodiment 1 of the present application, the fishbone well injection and production experimental device used includes a visualization model, a fishbone well, an injection well, and a locking switch. The inner cavity of the visualization model is used to fill quartz sand, the injection well is arranged in the inner cavity of the visualization model, and is used to inject water and oil into the inner cavity of the visualization model, and the fishbone well is arranged in the inner cavity of the visualization model, and is used to discharge water and oil from the inner cavity of the visualization model. The locking switch is connected to the fishbone well and is used to control the flow rate of water and oil at the production end of the fishbone well. In the fishbone well, since the main wellbore and the branch wellbore have their own wellbore circulation channels, it is easier to judge the water breakthrough time and contribution of the main wellbore and the branch wellbore. In addition, since the perforation position and number on the main wellbore and the branch wellbore are controllable, the requirements of the perforation position and number under different experimental conditions can be met.

[0052] Furthermore, based on the above-mentioned embodiment 1, the structural composition of the visualization model is described in detail below through embodiment 2.

[0053] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a visualization model provided in Example 2 of the present application. The visualization model includes a removable cover plate 1011, which is located on the side of the visualization model 101. Quartz sand is filled into the inner cavity of the visualization model through the removable cover plate 1011. The side surface is the smallest surface in the visualization model 101.

[0054] By filling the side with quartz sand, due to the small side area, the pressure on the removable cover plate 1011 is more uniform when the cover plate bolts 1013 are used to press the removable cover plate 1011, so that the quartz sand can be compacted more evenly, and the quartz sand can fit more closely to the inner wall of the visualization model 101.

[0055] The visualization model further includes a visualization window 1012 , cover bolts 1013 , a visualization model housing 1014 and housing bolts 1015 .

[0056] Removable cover 1011 is connected to visualization model 101 via cover bolts 1013, which secure it. A rubber ring seals the removable cover 1011 and the visualization model housing 1014. A visualization window 1012 is embedded in the top surface of the visualization model housing 1014. This frosted window prevents water from sticking to the surface and flowing through it. The visualization model housing 1014 is connected via housing bolts 1015, and the housings are sealed with rubber rings.

[0057] In the present application, the material of the detachable cover 1011 and the visual model shell 1014 can be stainless steel.

[0058] In the above-mentioned embodiment 2 of the present application, quartz sand is filled into the inner cavity of the visualization model through the removable cover in the visualization model. The removable cover is located on the side of the visualization model, which is the surface with the smallest area in the visualization model, so as to facilitate the compaction of the evenly filled quartz sand.

[0059] Furthermore, the structure of the fishbone well has been briefly described in the above embodiment 1. Now, the structural composition of the fishbone well will be described in more detail through embodiment 3.

[0060] As shown in the first embodiment, the fishbone well includes a main wellbore 1021 and at least one branch wellbore 1022 .

[0061] There are two possible positional relationships between the branch wellbore 1022 and the main wellbore 1021:

[0062] One is that the branch wellbore 1022 is located on one side of the main wellbore 1021;

[0063] The other is that the branch wellbore 1022 is located on the opposite side of the main wellbore 1021. Figure 3A 、 Figure 3B .

[0064] The connection angle α between the branch wellbore 1022 and the main wellbore 1021 can be set according to experimental requirements, usually 30°, 45°, 60° or 90°, or other angles. The angles listed in this application are not intended to limit this application.

[0065] The main wellbore 1021 is connected to the main wellbore circulation channel 1023, and the branch wellbore 1022 is connected to the branch wellbore circulation channel 1024. There can be multiple branch wellbores, and the number of branch wellbore circulation channels corresponds to the number of branch wellbores. It should be noted that the branch wellbore circulation channels are independent of each other and are arranged within the main wellbore circulation channel, which facilitates the measurement of the contribution of the main wellbore 1021 and the branch wellbore 1022 to the total oil production, as well as the calculation of the water breakthrough time of the main wellbore 1021 and the branch wellbore 1022. Among them, the contribution refers to the percentage of the oil production of the main wellbore and each branch wellbore in the total production, and the water breakthrough time refers to the time when the main wellbore and each branch wellbore begin to produce water.

[0066] Multiple perforations 1025 are installed in the main wellbore 1021 and the branch wellbore 1022, evenly spaced along their lengths. Experimenters can select a different number of perforations 1025 at different locations based on experimental needs, without having to replace the fishbone well used for the experiment, making operation more convenient. The opening and closing of the perforations 1025 are controlled by rubber plugs. As you can see, the more perforations 1025 are opened, the greater the contact area between the fishbone well and the reservoir.

[0067] For example, if the experiment requires the use of 10 perforations 1025 at position A of the main wellbore 1021 and 10 perforations 1025 at position B of the branch wellbore 1022, then the remaining perforations 1025 not needed in the experiment can be plugged with rubber plugs.

[0068] For example, if the experiment requires the use of 20 perforations 1025 at position C of the main wellbore 1021 and 20 perforations 1025 at position D of the branch wellbore 1022, then the perforations 1025 required for the experiment that are blocked with rubber plugs need only be removed.

[0069] By controlling the opening and closing of the perforations 1025 , the effects of different positions and numbers of the perforations 1025 on the fluid production at the production end of the fishbone well are simulated.

[0070] A locking switch 104 is also provided at the output end of the fishbone well 102 for controlling the water / oil output of different flow channels at the output end of the fishbone well 102 .

[0071] Specifically,

[0072] The main shaft circulation channel 1023 and the branch shaft circulation channel 1024 of the fishbone well 102 are each provided with a locking switch 104. The amount of water / oil flowing out is controlled by controlling the degree of opening of the locking switch 104. There can be multiple branch shaft circulation channels 1024, corresponding to the number of branch shafts 1022.

[0073] In the present application, the material of the fishbone well can be stainless steel.

[0074] It should be noted that before using the fishbone well 102, it must first be wrapped with gauze to prevent quartz sand in the visualization model 101 from entering the inner cavity of the fishbone well 102 through the perforations 1025 and affecting the fluidity of water / oil in the inner cavity of the fishbone well 102. The fishbone well 102 is then installed in the inner cavity of the visualization model 101 using the fixing brackets, and the locking switch 104 at the output end of the fishbone well 102 is closed.

[0075] In the above-mentioned embodiment 3 of the present application, the fishbone well structure used includes a main wellbore, at least one branch wellbore, a main wellbore circulation channel, at least one branch wellbore circulation channel and perforations. Among them, the branch wellbore circulation channel is arranged in the main wellbore circulation channel. Since the main wellbore and the branch wellbore have their own wellbore circulation channels, it is easier to judge the water breakthrough time and contribution of the main wellbore and the branch wellbore. The perforations are evenly distributed at equal distances along the length direction of the main wellbore and the branch wellbore, and are controlled to open or close by rubber plugs. By controlling the position and number of perforations on the main wellbore and the branch wellbore, the requirements for the position and number of perforations under different experimental conditions can be met.

[0076] Furthermore, based on the above-mentioned embodiments 1 to 3, the structure and use method of the fishbone well injection and production experimental device will be fully described below through embodiment 4.

[0077] The structure of the fishbone well injection and production experimental device:

[0078] like Figure 4 As shown, Figure 4 The structural diagram of another fishbone well injection and production experimental device provided in the embodiment of the present application is as follows: Figure 4 As shown, the device structure includes, in addition to the visualization model 101 , the fishbone well 102 , the injection well 103 , and the locking switch 104 , a visualization model bracket 105 and a rotation fixing switch 106 .

[0079] The visualization model support 105 is connected to the visualization model 101 and is used to support the visualization model 101 . The visualization model 101 can rotate on the visualization model support 105 .

[0080] The rotation fixing switch 106 is connected to the visual model support 105 and is used to fix the rotation position of the visual model 101 .

[0081] The injection-production experimental device in this embodiment can be rotated and fixed on the bracket, so as to simulate the effects of different formation dips, longitudinal heterogeneity, and planar heterogeneity on oil and gas production during actual oil and gas field production.

[0082] How to use the fishbone well injection and production experimental device:

[0083] First, the visualization model 101 is rotated to a position where the detachable cover 1011 faces upward, and after removing the detachable cover 1011, quartz sand is filled into the inner cavity of the visualization model 101 through this position. After the quartz sand is filled, the filled quartz sand is compacted and the detachable cover 1011 is installed.

[0084] Next, pre-dyed kerosene is injected into visualization model 101 through injection well 103. To fully saturate the gaps between the quartz sand with kerosene, visualization model 101 is rotated so that injection well 103 is at the bottom and fishbone well 102 is at the top. Simultaneously, lock switch 104 at the output end of fishbone well 102 is opened. Injection pressure is applied to completely penetrate the gaps between the quartz sand with kerosene. After a predetermined period of time, when the gaps between the quartz sand are fully saturated with kerosene, visualization model 101 is rotated so that its visualization window 1012 is at the top.

[0085] Finally, a pre-dyed displacement medium is injected into visualization model 101 through injection well 103. The displacement medium can be water, for example. It is important to note that the kerosene and displacement medium are dyed with an immiscible dye to create contrasting colors. This facilitates observation of the dynamic changes in the oil-water displacement front, i.e., changes in swept volume, through visualization window 1012. During displacement medium injection, the water / oil production from the main wellbore 1021 and branch wellbore 1022 of fishbone well 102 is recorded at regular intervals. This water / oil production can be measured using a graduated measuring instrument, such as a graduated cylinder.

[0086] In the above-mentioned embodiment four of the present application, the injection-production experimental device of this embodiment can effectively measure and count the oil production and water breakthrough time of the fishbone well, and it is convenient to distinguish the water breakthrough time and contribution of the main wellbore and the branch wellbore, making the experimental results more accurate and comprehensive.

[0087] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0088] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A fishbone well injection and production experimental device, characterized in that: Includes visualization model, fishbone well, injection well, and lock switch; The inner cavity of the visualization model is filled with quartz sand; The injection well is provided in the inner cavity of the visualization model and is used to inject water and oil into the inner cavity of the visualization model; The fishbone well is arranged in the inner cavity of the visualization model and is used to discharge water and oil from the inner cavity of the visualization model. The fishbone well includes a main wellbore, at least one branch wellbore, a main wellbore circulation channel, at least one branch wellbore circulation channel, and perforations. The main wellbore is connected to the main wellbore circulation channel, and the branch wellbore is connected to the branch wellbore circulation channel. At least one branch wellbore circulation channel is arranged in the main wellbore circulation channel, and each wellbore circulation channel is independent of each other; the branch wellbore is connected to the main wellbore at a preset angle, and a plurality of perforations are respectively arranged on the main wellbore barrel and the branch wellbore barrel; The main shaft circulation channel of the fishbone well and the branch well shaft circulation channel are respectively provided with the locking switch; the locking switch is connected to the fishbone well and is used to control the flow rate of water and oil at the production end of the fishbone well by controlling the opening degree of the locking switch; The visualization model includes a detachable cover plate, which is located on a side of the visualization model. The quartz sand is filled into the inner cavity of the visualization model through the detachable cover plate. The side is the surface with the smallest area in the visualization model.

2. The device according to claim 1, characterized in that The perforations are evenly distributed at equal distances along the length direction of the main wellbore and the branch wellbore.

3. The device according to claim 2, characterized in that The perforations are opened or closed by controlling the rubber plug.

4. The device according to claim 1, characterized in that The visualization model also includes a visualization window, a cover bolt, a visualization model shell and a shell bolt. The detachable cover is connected to the visualization model shell through the cover bolt. The visualization window is embedded in the top surface of the visualization model shell, and the visualization model shell is connected through the shell bolt.

5. The device according to claim 4, characterized in that The detachable cover plate and the visual model housing are sealed by a rubber ring.

6. The device according to claim 1, characterized in that It also includes a visualization model bracket, which is connected to the visualization model and is used to support the visualization model.

7. The device according to claim 6, characterized in that It also includes a rotation fixing switch, which is connected to the visual model bracket and is used to fix the rotation position of the visual model.

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