A simulation device and method for simulating the migration of micro-nano bubbles in a wellbore

Abstract

The present application discloses a simulation device and method for simulating the migration of micro-nano bubbles in a wellbore, belonging to the field of micro-nano bubble migration simulation. The simulation wellbore of the simulation device is vertically arranged; the bracket is arranged at the wellhead of the simulation wellbore; the lower end of the microbubble generator is fixedly connected to the upper end of the height difference bubble injector and then fixed to the bracket; the first lifting mechanism is connected to the lower end of the height difference bubble injector to adjust the depth of the height difference bubble injector extending to the inner cavity of the simulation wellbore; the second lifting mechanism is arranged on the inner wall of the simulation wellbore; the bubble detection mechanism is arranged on the second lifting mechanism and can move axially along the simulation wellbore under the drive of the second lifting mechanism; the gas phase regulating mechanism is arranged on the air inlet end of the microbubble generator; the liquid phase regulating mechanism is arranged on the liquid inlet end of the microbubble generator; the bubble detection mechanism, gas phase, and liquid phase regulating mechanisms are all electrically connected to the controller. The present application enables staff to have a reference to effectively regulate the pressure, flow rate, etc. of micro-nano foams.

Description

Technical Field

[0001] The present application relates to the technical field of micro-nano bubble migration simulation, and in particular to a simulation device and a simulation method for simulating the migration of micro-nano bubbles in a wellbore. Background Art

[0002] Microfoam flooding technology improves oilfield recovery efficiency by injecting microfoam fluid into the formation. Due to its advantages in improving sweep efficiency and oil washing efficiency, microfoam flooding has become an effective means of enhancing crude oil recovery in the oil production process. Compared to conventional foam, microfoam boasts finer bubbles, greater stability, and excellent shape-shifting properties. Its injectability and deep plugging capabilities are superior to those of conventional foam in crude oil production. In actual use, the injectability and deep plugging capabilities of microfoam are both affected by its particle size.

[0003] Currently, due to uncontrollable factors such as pressure and flow rate during the micro-nano foam production process, the resulting micro-nano bubbles fuse with each other, resulting in excessive particle size. Furthermore, the lack of effective monitoring methods for the migration of micro-nano foam downhole prevents researchers from effectively regulating the pressure and flow rate of the micro-nano foam based on its actual migration downhole. Summary of the Invention

[0004] The embodiments of the present application provide a simulation device and a simulation method for simulating the migration of micro-nano bubbles in a wellbore, which can solve the current problem of lack of effective means to detect the migration of micro-nano foam in the wellbore, making it impossible for staff to effectively regulate the pressure, flow rate, etc. of the micro-nano foam according to the actual migration of the micro-nano foam in the wellbore.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is:

[0006] In a first aspect, an embodiment of the present invention provides a simulation device for simulating the migration of micro-nano bubbles in a wellbore, characterized by comprising a simulated wellbore, a support, a microbubble generator, a height difference bubble injector, a first lifting mechanism, a second lifting mechanism, a bubble detection mechanism, a gas phase regulating mechanism, a liquid phase regulating mechanism, and a controller;

[0007] The simulated wellbore is arranged vertically;

[0008] The support is arranged at the wellhead of the simulated wellbore;

[0009] The lower end of the microbubble generator is fixedly connected to the upper end of the height difference bubble injector and then inserted into the bracket, and the lower part of the height difference bubble injector is extended into the inner cavity of the simulated wellbore;

[0010] The first lifting mechanism is connected to the lower end of the height difference bubble injector to adjust the depth of the height difference bubble injector extending into the inner cavity of the simulated wellbore;

[0011] The second lifting mechanism is arranged on the inner wall of the simulated wellbore;

[0012] The bubble detection mechanism is provided on the second lifting mechanism and can move axially along the simulated wellbore under the drive of the second lifting mechanism;

[0013] The gas phase regulating mechanism is arranged on the air inlet end of the microbubble generator;

[0014] The liquid phase regulating mechanism is arranged on the liquid inlet end of the microbubble generator;

[0015] The bubble detection mechanism, the gas phase adjustment mechanism and the liquid phase adjustment mechanism are all electrically connected to the controller.

[0016] In combination with the first aspect, in a possible implementation, the microbubble generator includes a top cover, a liquid inlet pipe, an air inlet pipe, a swirl member, and a gas-liquid mixing cylinder;

[0017] The top cover is provided with a first through hole and a second through hole, and is buckled onto the top of the gas-liquid mixing cylinder;

[0018] The lower end of the gas-liquid mixing cylinder is fixedly connected to the upper end of the height difference bubble injector;

[0019] The liquid inlet pipe is inserted and fixed in the first through hole;

[0020] The liquid phase regulating mechanism is arranged on the liquid inlet pipe;

[0021] The swirl element is a shell having a hollow interior and a third through hole on the top, a spiral groove on the outer wall, and a plurality of fourth through holes penetrating the side wall of the swirl element arranged in the spiral groove;

[0022] The air intake pipe is inserted into the second through hole, and the end thereof is inserted into the third through hole.

[0023] The gas phase regulating mechanism is arranged on the air inlet pipe;

[0024] The outer shape of the side wall of the swirl element is adapted to the inner wall shape of the gas-liquid mixing cylinder, and is arranged in the inner cavity of the gas-liquid mixing cylinder. The outer wall of the swirl element is spaced a preset distance from the inner wall of the gas-liquid mixing cylinder.

[0025] In combination with the first aspect, in a possible implementation, the gas-liquid mixing cylinder includes a contraction cylinder section, a throat cylinder section, and an expansion cylinder section sequentially arranged along the fluid flow direction;

[0026] The inner wall of the shrinking cylinder section is in the shape of a platform, with the large open end serving as the top;

[0027] The inner wall of the throat section is cylindrical;

[0028] The inner wall of the expansion barrel section is in a table shape, with the large opening end serving as the bottom;

[0029] The swirl member is located in the inner cavity of the contraction barrel section.

[0030] In combination with the first aspect, in a possible implementation, the microbubble generator further includes a clamping plate and a driving cylinder;

[0031] The air intake pipe includes a first sub-pipe and a second sub-pipe;

[0032] The clamping plate is clamped to the port of the top cover and is located below the first through hole. A mounting shaft hole is provided in the middle portion, and a plurality of fifth through holes are provided in a circular array around the mounting shaft hole.

[0033] The first sub-tube is inserted and fixed in the second through hole, and the end thereof is inserted and fixed in the mounting shaft hole;

[0034] One end of the second sub-tube is inserted into the terminal end of the first sub-tube, and the other end is fixedly inserted into the third through hole, and can be extended and retracted along its own axis;

[0035] There are multiple driving cylinders, which are arranged in a ring array around the central axis of the second sub-tube, and have two ends respectively connected to the surface of the clamping plate and the upper end of the swirl member.

[0036] In combination with the first aspect, in a possible implementation, the microbubble generator further includes a bubble refinement structure;

[0037] The bubble refinement structure includes at least one, which is sequentially clamped at the output end of the gas-liquid mixing cylinder and is configured to further fracture and refine the foam input therein.

[0038] In combination with the first aspect, in a possible implementation, each of the bubble refining structures includes a transmission assembly, a fixed disc, and a rotating disc;

[0039] The fixed disc is evenly distributed with a plurality of fifth through holes, which are fixed to the output end of the gas-liquid mixing cylinder;

[0040] The rotating disc is evenly distributed with a plurality of sixth through holes, which are clamped at the output end of the gas-liquid mixing cylinder and are adjacent to the fixed disc. The number of the sixth through holes is the same as the number of the fifth through holes, and the positions correspond one to one.

[0041] The transmission assembly is connected to the rotating disc, and can drive the rotating disc to rotate relative to the fixed disc to change the area of ​​the port of the fifth through hole.

[0042] In combination with the first aspect, in a possible implementation, the height difference bubble injector includes a plurality of sleeves that are sequentially sleeved;

[0043] The inner diameter of the upper sleeve is larger than the outer diameter of the lower sleeve, and an inner ring is provided at the bottom of the upper sleeve, and an outer ring is provided at the top of the lower sleeve, and the inner diameter of the inner ring is smaller than the outer diameter of the outer ring;

[0044] The upper end of the uppermost sleeve is fixedly connected to the lower end of the microbubble generator;

[0045] The lower end of the lowermost sleeve is connected to the first lifting mechanism.

[0046] In combination with the first aspect, in a possible implementation, the first lifting mechanism includes a winch, a cable, a sliding plate, a hook, and a slider;

[0047] A fixing hole is provided in the middle of the sliding plate;

[0048] The lower end of the height difference bubble injector is inserted and fixed in the fixing hole;

[0049] The inner wall of the wellbore is provided with an axial sliding groove;

[0050] The slider is arranged on the side of the sliding plate, and is slidably arranged in the sliding groove, so that the sliding plate is clamped in the inner cavity of the simulated wellbore and can slide along the axial direction of the simulated wellbore;

[0051] The hook is provided on the upper surface of the sliding plate;

[0052] The hoist is arranged on the outside of the top of the simulated wellbore;

[0053] One end of the cable is sleeved on the drum of the winch, and the other end extends to the interior of the simulated wellbore and is connected to the hook.

[0054] In combination with the first aspect, in a possible implementation, the second lifting mechanism includes a driving motor, a driving bevel gear, a driven bevel gear, a screw and a screw seat;

[0055] The output shaft of the driving motor passes through the side wall of the simulated wellbore and is then sleeved with the driving bevel gear;

[0056] The screw rod is sleeved with the driven bevel gear, with both ends fixed to the simulated wellbore and the central axis parallel to the axial direction of the simulated wellbore, and the driven bevel gear is meshed with the driving bevel gear;

[0057] The screw seat is threadedly fitted on the screw;

[0058] The bubble detection mechanism is arranged on the screw seat.

[0059] In a second aspect, another embodiment of the present invention provides a method for simulating the migration of micro-nano bubbles in a wellbore, comprising:

[0060] The liquid phase pressure and liquid phase flow rate entering the microbubble generator are adjusted to preset values ​​by the liquid phase regulating mechanism, and the gas phase pressure and gas phase flow rate entering the microbubble generator are adjusted to preset values ​​by the gas phase regulating mechanism;

[0061] Micro-nano bubbles are generated by a micro-bubble generator and input into a height difference bubble injector, and then the measurement steps are performed multiple times;

[0062] The measuring step includes: adjusting the height difference bubble injector to extend to the depth of the simulated wellbore cavity by a first lifting mechanism, adjusting the second lifting mechanism to drive the bubble detection mechanism to move axially along the simulated wellbore to a preset position, and detecting the particle size and density of micro-nano bubbles in the simulated wellbore cavity in real time by the bubble detection mechanism;

[0063] The bubble detection mechanism feeds back the detection result to the controller, and the controller controls the liquid phase regulating mechanism to regulate the liquid phase pressure and liquid phase flow, and controls the gas phase regulating mechanism to regulate the gas phase pressure and gas phase flow.

[0064] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0065] The simulation device for simulating the migration of micro-nano bubbles in a wellbore provided by an embodiment of the present invention is first assembled when conducting a simulation experiment. Then, the liquid phase pressure and liquid phase flow rate entering the microbubble generator are adjusted to preset values ​​by a liquid phase regulating mechanism, and the gas phase pressure and gas phase flow rate entering the microbubble generator are adjusted to preset values ​​by a gas phase regulating mechanism. Micro-nano bubbles are generated by the microbubble generator and input into a height difference bubble injector, and then a measurement step is performed multiple times. The measurement step includes: adjusting the height difference bubble injector to the depth of the simulated wellbore inner cavity by a first lifting mechanism, adjusting the second lifting mechanism to drive the bubble detection mechanism to move axially along the simulated wellbore to a preset position, the lower end of the microbubble generator is fixedly connected to the upper end of the height difference bubble injector, the microbubble generator generates micro-nano bubbles, and injects micro-nano bubbles into the simulated wellbore through the height difference bubble injector whose lower part extends into the inner cavity of the simulated wellbore. During the injection process, the bubble detection mechanism detects the particle size and density of the micro-nano bubbles in the simulated wellbore inner cavity in real time. By performing the measurement step multiple times, the size and density of the micro-nano bubbles at different depths of the simulated wellbore can be measured. The bubble detection mechanism wirelessly or wiredly feeds back the detection results to the controller, which then regulates the liquid phase regulation mechanism to adjust the liquid phase pressure and liquid phase flow rate, and regulates the gas phase regulation mechanism to adjust the gas phase pressure and gas phase flow rate, thereby regulating the size and density of the micro-nano bubbles generated by the bubble detection mechanism to reach target values, and dynamically regulating the size and density of the micro-nano bubbles ultimately injected into the simulated wellbore using real-time feedback. The simulation device of the embodiment of the present invention is capable of dynamically regulating the movement and transfer of micro-nano bubbles within the simulated wellbore under different liquid phase and gas phase injection parameter conditions, and dynamically regulating the injection parameters of the micro-nano bubbles based on the detection results. Recording the measured real-time data can provide a scientific and effective reference for the actual migration of micro-nano bubbles in the wellbore, enabling actual personnel to effectively regulate the pressure, flow rate, etc. of the micro-nano bubbles based on this reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0067] Figure 1 A schematic diagram of the structure of a simulation device for simulating the migration of micro-nano bubbles in a wellbore provided in an embodiment of the present application;

[0068] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0069] Figure 3 for Figure 1Middle BB view;

[0070] Figure 4 A schematic structural diagram of a microbubble generator provided in an embodiment of the present application;

[0071] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0072] Figure 6 This is a schematic structural diagram of the lower portion of a simulation device for simulating the migration of micro-nano bubbles in a wellbore, as provided in an embodiment of the present application.

[0073] Icons: 1-simulated wellbore; 11-chute; 2-bracket; 3-microbubble generator; 30-top cover; 31-liquid inlet pipe; 32-air inlet pipe; 33-swirl element; 331-spiral groove; 332-fourth through hole; 34-gas-liquid mixing cylinder; 341-contraction cylinder section; 342-throat section; 343-expansion cylinder section; 344-installation cylinder section; 345-straight cylinder section; 346-extension ring; 35-clamping disc; 351-seventh through hole; 36-driving cylinder; 37-bubble refinement structure; 371-transmission assembly; 371a-driving wheel; 371b-driving gear; 371c-gear ring; 371d - driving liquid input channel; 371e - driving liquid output channel; 372 - fixed disk; 372a - fifth through hole; 373 - rotating disk; 373a - sixth through hole; 38 - flow guide; 4 - height difference bubble injector; 41 - sleeve; 5 - first lifting mechanism; 51 - winch; 52 - cable; 53 - sliding plate; 54 - hook; 55 - slider; 6 - second lifting mechanism; 61 - driving motor; 62 - driving bevel gear; 63 - driven bevel gear; 64 - screw; 65 - screw seat; 7 - bubble detection mechanism; 8 - gas phase adjustment mechanism; 9 - liquid phase adjustment mechanism; 10 - vortex breaker; 20 - temperature controller. DETAILED DESCRIPTION

[0074] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0075] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0076] Please refer to Figures 1 to 6 As shown, an embodiment of the present invention provides a simulation device for simulating the migration of micro-nano bubbles in a wellbore, including a simulated wellbore 1, a bracket 2, a microbubble generator 3, a height difference bubble injector 4, a first lifting mechanism 5, a second lifting mechanism 6, a bubble detection mechanism 7, a gas phase regulating mechanism 8, a liquid phase regulating mechanism 9 and a controller.

[0077] like Figure 1 As shown, the simulated wellbore 1 is set vertically. Among them, the simulated wellbore 1 is used to simulate the wellbore structure under actual working conditions. It is made of metal or concrete materials. The diameter and axial height of the simulated wellbore 1 can be flexibly set according to actual simulation requirements. Its axial height is preferably 10m to 20m.

[0078] The bracket 2 is set at the wellhead of the simulated wellbore 1. The lower end of the microbubble generator 3 is fixedly connected to the upper end of the height difference bubble injector 4 and then inserted into the bracket 2, and the lower part of the height difference bubble injector 4 is extended into the inner cavity of the simulated wellbore 1. Figure 1 As shown, the function of the bracket 2 is to support and fix the lower end of the microbubble generator 3 and the upper end of the height difference bubble injector 4.

[0079] The first lifting mechanism 5 is connected to the lower end of the height difference bubble injector 4 to adjust the depth of the height difference bubble injector 4 extending to the inner cavity of the simulated wellbore 1, and then when micro-nano bubbles are injected into the height difference bubble injector 4, the depth of the micro-nano bubbles injected into the simulated wellbore 1 can be adjusted. The second lifting mechanism 6 is arranged on the inner wall of the simulated wellbore 1. The bubble detection mechanism 7 is arranged on the second lifting mechanism 6, and can move axially along the simulated wellbore 1 under the drive of the second lifting mechanism 6. The bubble detection mechanism 7 can be a bubble detector. The bubble detector is based on the principle of laser scattering detection, and can determine the size distribution of particles in the sample by measuring the intensity and angle of scattered light, thereby being able to detect the size and density of bubbles. At the same time, the bubble detector can withstand high temperature and high pressure.

[0080] The gas phase regulating mechanism 8 is disposed at the gas inlet end of the microbubble generator 3. The gas inlet end is used to introduce the gas phase. The liquid phase regulating mechanism 9 is disposed at the liquid inlet end of the microbubble generator 3. The liquid inlet end is used to introduce the liquid phase. The bubble detection mechanism 7, the gas phase regulating mechanism 8, and the liquid phase regulating mechanism 9 are all electrically connected to a controller. A controller model STC89C52 can be used. The liquid phase regulating mechanism 9 includes a coupled liquid phase pressure regulating valve group and a liquid phase flow regulating valve group, and the gas phase regulating mechanism 8 includes a coupled gas phase pressure regulating valve group and a gas phase flow regulating valve group.

[0081] The liquid phase regulating mechanism 9 regulates the liquid inlet parameters of the liquid phase under the control of the controller according to the detection results of the bubble detection mechanism 7 , and the gas phase regulating mechanism 8 regulates the gas phase inlet parameters under the control of the controller according to the detection results of the bubble detection mechanism 7 .

[0082] The simulation device for simulating the migration of micro-nano bubbles in a wellbore provided by an embodiment of the present invention is first assembled when conducting a simulation experiment. Then, the liquid phase pressure and liquid phase flow rate entering the microbubble generator 3 are adjusted to preset values ​​by the liquid phase regulating mechanism 9, and the gas phase pressure and gas phase flow rate entering the microbubble generator 3 are adjusted to preset values ​​by the gas phase regulating mechanism 8. Micro-nano bubbles are generated by the microbubble generator 3 and input into the height difference bubble injector 4. Then, a measurement step is performed multiple times. The measurement step includes: adjusting the depth of the height difference bubble injector 4 extending into the inner cavity of the simulated wellbore 1 by the first lifting mechanism 5, adjusting the second lifting mechanism 6 to drive the bubble detection mechanism 7 to move axially along the simulated wellbore 1 to a preset position, the lower end of the microbubble generator 3 is fixedly connected to the upper end of the height difference bubble injector 4, the microbubble generator 3 generates micro-nano bubbles, and injects the micro-nano bubbles into the simulated wellbore 1 through the height difference bubble injector 4 extending from the lower end into the inner cavity of the simulated wellbore 1. During the injection process, the bubble detection mechanism 7 detects the particle size and density of the micro-nano bubbles in the inner cavity of the simulated wellbore 1 in real time. By repeatedly performing the measurement steps, the size and density of micro-nano bubbles at different depths in the simulated wellbore 1 can be measured. The bubble detection mechanism 7 wirelessly or wiredly feeds back the detection results to the controller, which regulates the liquid phase regulation mechanism 9 to adjust the liquid phase pressure and liquid phase flow, and regulates the gas phase regulation mechanism 8 to adjust the gas phase pressure and gas phase flow, thereby regulating the size and density of the micro-nano bubbles generated by the bubble detection mechanism 7 to reach the target value, and dynamically regulating the size and density of the micro-nano bubbles finally injected into the simulated wellbore 1 in real-time feedback mode. The simulation device of the embodiment of the present invention can dynamically regulate the movement and transfer of micro-nano bubbles inside the simulated wellbore 1 under different liquid phase and gas phase injection parameter conditions, and dynamically regulate the injection parameters of the micro-nano bubbles based on the detection results. The real-time data recording of the measurement can provide a scientific and effective reference for the actual migration of micro-nano bubbles in the wellbore, so that the staff can effectively regulate the pressure, flow rate, etc. of the micro-nano foam based on this reference.

[0083] like Figure 4 As shown, the micro-bubble generator 3 includes a top cover 30, a liquid inlet pipe 31, an air inlet pipe 32, a swirl element 33, and a gas-liquid mixing cylinder 34. The top cover 30 is provided with a first through hole and a second through hole, and is buckled onto the top of the gas-liquid mixing cylinder 34. The lower end of the gas-liquid mixing cylinder 34 is fixedly connected to the upper end of the height difference bubble injector 4. The liquid inlet pipe 31 is inserted and fixed into the first through hole. Figure 5As shown, the swirl element 33 is a hollow shell with a third through-hole at the top. Its outer wall is provided with a spiral groove 331, and a plurality of fourth through-holes 332 are arranged in the spiral groove 331, extending through the sidewall of the swirl element 33. The inlet pipe 32 is inserted through the second through-hole and its end is inserted into the third through-hole. The inlet pipe 32 delivers the incoming gas to the inner cavity of the swirl element 33, which serves as the gas chamber. The gas phase regulating mechanism 8 is located on the inlet pipe 32, outside the top cover 30.

[0084] like Figure 1 As shown, the liquid inlet pipe 31 is generally disposed on the side wall of the top cover 30. Therefore, the placement of the liquid inlet pipe 31 on the side wall of the top cover 30 facilitates the placement of the swirl element 33 and facilitates the connection of the air inlet pipe 32 to the swirl element 33, without requiring the air inlet pipe 32 to be bent. The liquid phase regulating mechanism 9 is disposed on the liquid inlet pipe 31, located outside the top cover 30.

[0085] The top cover 30 is provided to facilitate installation of the liquid inlet pipe 31 and the air inlet pipe 32, and to form a closed space on the top of the micro-bubble generator 3, so that liquid can be easily input into the inner cavity of the micro-bubble generator 3, gas is not easily lost, and the generated micro-nano bubbles are not easily overflowed.

[0086] The sidewalls of the swirl element 33 are shaped to match the inner wall of the gas-liquid mixing barrel 34. The swirl element 33 is positioned within the inner cavity of the gas-liquid mixing barrel 34, with a preset distance between the outer wall of the swirl element 33 and the inner wall of the gas-liquid mixing barrel 34, thereby forming a gas-liquid mixing annular cavity. In actual use, the gas phase is input from the air inlet pipe 32 and transported to the gas cavity of the swirl element 33. It is then uniformly ejected from the outer wall of the swirl element 33 through the fourth through-hole 332. The liquid phase input from the liquid inlet pipe 31 enters the top cover 30 and flows into the gas-liquid mixing barrel 34. It is fully mixed with the gas phase in the spiral groove 331, swirling and then entering the gas-liquid mixing annular cavity. The swirling shear force causes the bubbles in the liquid to be fully cleaved and broken, efficiently generating dense micro-nano foam, which then flows out from the bottom of the gas-liquid mixing annular cavity.

[0087] like Figure 4 As shown, the gas-liquid mixing cylinder 34 includes a contracting cylinder section 341, a throat section 342, and an expanding cylinder section 343, which are arranged in sequence along the fluid flow direction. The inner wall of the contracting cylinder section 341 is shaped like a platform, with the large open end serving as the top. Of course, to facilitate connection with the top cover 30, the gas-liquid mixing cylinder 34 also includes a straight cylinder section 345 and an extension ring 346. The straight cylinder section 345 is arranged above the contracting cylinder section 341, and the extension ring 346 is arranged on the outer wall of the upper end of the straight cylinder section 345. The extension ring 346 is fixedly connected to the top cover 30.

[0088] The inner wall of the throat section 342 is cylindrical. The inner wall of the expansion section 343 is table-shaped, with the large open end serving as the bottom. The swirl element 33 is located within the inner cavity of the contraction section 341. The lower portion of the swirl element 33 is table-shaped to match the shape of the contraction section 341.

[0089] The gas-liquid mixing cylinder 34 provided in the embodiment of the present application is configured such that the liquid phase entering the liquid inlet pipe 31 flows into the contracting cylinder section 341 and flows through the spiral groove 331 provided on the surface of the swirl member 33 in the contracting cylinder section 341. This causes the liquid phase to swirl along the spiral groove 331 as it enters the contracting cylinder section 341, thereby generating a swirl shear force. The swirl is mixed with the gas flowing out of the fourth through hole 332 of the swirl member 33 to form micro-nano bubbles, ensuring the shear cracking of the bubbles in the liquid. By providing a contracting cylinder section 341 with a contraction at the front end, a throat section 342 with a transition in the middle, and an expansion cylinder section 343 with an expansion at the rear end, the diameter of the contracting cylinder section 341 gradually decreases, increasing the fluid flow rate and pressure, ensuring the axial flow velocity and pressure of the fluid, and further cracking and fragmenting the micro-nano bubbles, efficiently obtaining fine micro-nano bubbles. The fluid then passes through the throat section 342. The outflow to the expansion cylinder section 343 gradually slows down to avoid excessive fluid flow rate when passing through the next structure.

[0090] Continue to refer to Figure 4 and Figure 5 As shown, the microbubble generator 3 also includes a fixing plate 35 and a driving cylinder 36. The air inlet pipe 32 includes a first sub-tube and a second sub-tube (not shown in the figure). The fixing plate 35 is fixed to the port of the top cover 30 and is located below the first through hole. A mounting shaft hole is provided in the middle portion, and a plurality of seventh through holes 351 are provided around the mounting shaft hole in an annular array to allow the liquid phase to flow normally into the contraction tube section 341. The first sub-tube is fixed in the second through hole, and the end is inserted and fixed in the mounting shaft hole. One end of the second sub-tube is inserted in the terminal port of the first sub-tube, and the other end is inserted and fixed in the third through hole, and can be axially extended and retracted along its own axis. The second sub-tube can be made of a material with greater elasticity, or it can be made of a bellows.

[0091] There are multiple driving cylinders 36 , which are arranged in a circular array around the central axis of the second sub-tube, and have their two ends connected to the surface of the clamping plate 35 and the upper end of the swirl member 33 respectively.

[0092] The microbubble generator 3 provided in the embodiment of the present application has a fixing plate 35 fixed to the port of the top cover 30, and a plurality of driving cylinders 36 are arranged in a circular array around the central axis of the second sub-tube, and the two ends are respectively connected to the surface of the fixing plate 35 and the upper end of the swirl member 33, so that the second sub-tube can be extended and retracted along its own axial direction. Thus, the cylinder can drive the swirl member 33 to move along its own axial direction, thereby adjusting the preset distance between the outer wall of the swirl member 33 and the inner wall of the gas-liquid mixing cylinder 34 to adjust the flow pressure of the liquid, thereby ensuring that there is sufficient swirl shear force when the liquid phase and the gas phase are mixed and swirl. Specifically, the preset distance between the spiral groove 331 and the inner wall of the contraction barrel section 341 is reduced. At this time, the pressure of the liquid when swirling along the spiral groove 331 increases, thereby increasing the swirl shear force. Conversely, if the preset distance between the swirl channel and the inner wall of the contraction barrel section 341 increases, the swirl shear force decreases.

[0093] At this time, the second sub-tube is adaptively axially extended and contracted, and one end of the second sub-tube is inserted into the end opening of the first sub-tube, and the other end is fixed in the third through hole. The second sub-tube can connect the first sub-tube and the swirl member 33 without falling off, and does not affect the gas phase input.

[0094] Furthermore, the microbubble generator 3 also includes a flow guide 38. The flow guide 38 has a platform-like shape, resulting in an arcuate outer wall. An axial through-hole is provided in the center of the flow guide 38, allowing the flow guide 38 to be secured to the first sub-tube and positioned above the clamping plate 35, with its lower surface abutting the upper surface of the clamping plate 35. The flow guide 38 guides the liquid phase input from the liquid inlet pipe 31, allowing the liquid phase to flow more smoothly and centrally into the converging barrel section 341.

[0095] like Figures 1 to 3 As shown, the micro-bubble generator 3 also includes a bubble refinement structure 37. The bubble refinement structure 37 includes at least one (which can be one, two, three, etc., as shown in FIG. Figure 1 and Figure 2 The bubble refinement structure 37 is shown as a structural schematic diagram. ) is sequentially clamped at the output end of the gas-liquid mixing cylinder 34 and is configured to further crush and refine the foam input therein, so that the large-particle micro-nano bubbles flowing out of the gas-liquid mixing cylinder 34 are further crushed and refined.

[0096] Reference Figure 2 and Figure 3As shown, each bubble refinement structure 37 includes a transmission assembly 371, a fixed disc 372 and a rotating disc 373. The fixed disc 372 is evenly distributed with a plurality of fifth through holes 372a, which are fixed to the output end of the gas-liquid mixing cylinder 34. The rotating disc 373 is evenly distributed with a plurality of sixth through holes 373a, which are fixed to the output end of the gas-liquid mixing cylinder 34 and adjacent to the fixed disc 372. The number of the sixth through holes 373a is consistent with the number of the fifth through holes 372a, and the positions correspond one to one. The transmission assembly 371 is connected to the rotating disc 373 and can drive the rotating disc 373 to rotate relative to the fixed disc 372 to change the area of ​​the port of the fifth through hole 372a. The transmission assembly 371 is electrically connected to the controller.

[0097] In practice, the fixed disk 372 can be arranged first and then the rotating disk 373 can be arranged along the direction of bubble flow (eg Figure 2 As shown in the figure), the rotating disc 373 can be set first and then the fixed disc 372, and the fixed disc 372 and the rotating disc 373 only need to be set close to each other. The specific working process is: the transmission component 371 drives the rotating disc 373 to rotate relative to the fixed disc 372, so that the sixth through hole 373a on the rotating disc 373 is aligned or staggered with the fifth through hole 372a on the fixed disc 372, thereby dynamically adjusting the port area of ​​the fifth through hole 372a, and further fracturing and refining the bubbles with larger particle size in the micro-nano foam. Specifically, Figure 2 As an example, along the foam flow direction, the fixed disc 372 is first set and then the rotating disc 373 is set. When the area of ​​the lower side port of the fifth through hole 372a of the fixed disc 372 needs to be changed, the transmission component 371 works. Since the transmission component 371 is connected to the rotating disc 373, the transmission component 371 drives the rotating disc 373 to rotate relative to the fixed disc 372. The number of the sixth through holes 373a of the rotating disc 373 is consistent with the number of the fifth through holes 372a on the fixed disc 372 and the positions correspond one to one. When the central axis of the sixth through hole 373a is aligned with the fifth through hole 372a, the transmission component 371 is in a closed position. When the central axis of the sixth through hole 373a is coaxial with the central axis of the fifth through hole 372a, the area of ​​the lower port of the fifth through hole 372a is the largest. When the central axis of the sixth through hole 373a is not coaxial with the central axis of the fifth through hole 372a, the lower port of the fifth through hole 372a will be blocked by the position of the rotating disk 373 where there is no fifth through hole 372a, so that the area of ​​the port of the lower side fifth through hole 372a will be reduced, and then the bubble refinement structure 37 can reduce the area of ​​the bubbles, further crush and refine the bubbles, reduce the particle size of the bubbles, and make the texture of the micro-nano bubbles more uniform, thereby realizing dynamic adjustment of the port area of ​​the fifth through hole 372a.

[0098] like Figure 2 and Figure 3As shown, the gas-liquid mixing cylinder 34 also includes a mounting cylinder section 344, which is cylindrical in shape and is arranged below the expansion cylinder section 343. The transmission assembly 371 includes a driving wheel 371a, a driving gear 371b and a ring gear 371c. A driving cavity is provided on the inner wall of the mounting cylinder section 344 of the gas-liquid mixing cylinder 34. The driving wheel 371a is provided for rotation inside the driving cavity, and the inner wall surface of the driving cavity that matches the transmission surface of the driving wheel 371a is an arc surface. Figure 3 As shown, the wall of the drive chamber is provided with a drive liquid input channel 371d and a drive liquid output channel 371e. The inflow direction of drive liquid input channel 371d and the outflow direction of drive liquid output channel 371e are both tangent to the arc surface. Drive liquid input channel 371d is connected to the liquid inlet pipeline, and drive liquid output channel 371e is connected to the liquid outlet pipeline. Both the liquid inlet pipeline and the liquid outlet pipeline are connected to the pump station.

[0099] The drive gear 371b is connected to the output shaft of the drive wheel 371a. The ring gear 371c is mounted on the rotating disk 373 and meshes with the drive gear 371b. The drive wheel 371a can be a paddle wheel, which is readily available, lightweight, and easily driven by the drive fluid. The specific operating process is as follows: the pump station inputs drive fluid into the drive chamber through the liquid inlet pipeline. The drive wheel 371a inside the drive chamber is impacted by the drive fluid and rotates, thereby driving the drive gear 371b to rotate. The drive gear 371b meshes with the ring gear 371c, which is mounted on the rotating disk 373. The ring gear 371c then drives the rotating disk 373 to rotate, thereby adjusting the area of ​​the port of the fifth through hole 372a.

[0100] Specifically, during the process of injecting micro-nano bubbles into the simulated wellbore 1, the size and density of micro-nano bubbles at different depths in the simulated wellbore 1 are detected by the bubble detection mechanism 7 set in the inner cavity of the simulated wellbore 1, and the detected data is sent wirelessly or wired to the controller. The controller sends control instructions to the liquid phase regulation mechanism 9, the gas phase regulation mechanism 8, and the bubble refinement structure 37 according to the detected data. The liquid phase regulation mechanism 9 adjusts the liquid phase pressure and liquid phase flow entering the microbubble generator 3, the gas phase regulation mechanism 8 adjusts the gas phase pressure and gas phase flow entering the microbubble generator 3, and the bubble refinement structure 37 adjusts the area of ​​the fifth through hole 372a port, thereby dynamically controlling the size and density of the micro-nano bubbles finally injected into the simulated wellbore 1 in real time.

[0101] Furthermore, the transmission ratio between the driving gear 371 b and the ring gear 371 c is greater than or equal to 10, thereby preventing the rotating disk 373 from rotating too fast.

[0102] The installation of the mounting barrel section 344 facilitates the installation of the fixed disc 372 and the rotating disc 373, and allows the fixed disc 372 and the rotating disc 373 to have the same area, thereby facilitating the corresponding arrangement of the fifth through holes 372a and the sixth through holes 373a in the same number and position. Furthermore, since the expansion barrel section 343 is platform-shaped with the large opening at the bottom, the installation of the mounting barrel section 344 facilitates the return of the micro-nano bubbles flowing out of the expansion barrel section 343 to the height difference bubble injector 4.

[0103] like Figure 1 and Figure 6 As shown, the height difference bubble injector 4 includes a plurality of sleeves 41 which are sequentially sleeved. The inner diameter of the upper sleeve 41 is greater than the outer diameter of the lower sleeve 41, and the bottom of the upper sleeve 41 is provided with an inner ring, and the top of the lower sleeve 41 is provided with an outer ring, and the inner diameter of the inner ring is smaller than the outer diameter of the outer ring. The upper end of the uppermost sleeve 41 is fixedly connected to the lower end of the microbubble generator 3. The lower end of the lowermost sleeve 41 is connected to the first lifting mechanism 5. In practice, the lower sleeve 41 can move axially along the upper sleeve 41, thereby lengthening or shortening the height of the height difference bubble injector 4 and realizing axial expansion and contraction. Due to the arrangement of the inner ring and the outer ring, the lower sleeve 41 will not come out of the upper sleeve 41. The height difference bubble injector 4 provided in the embodiment of the present invention can realize the convenient axial movement of the height difference bubble injector 4 inside the simulated wellbore 1, thereby realizing the injection of micro-nano foam at different depths inside the simulated wellbore 1, and realizing the simulation of the migration of micro-nano foam at different depths inside the wellbore.

[0104] Further, such as Figure 2 and Figure 6 As shown, the inlet end of the telescopic bubble injector is provided with a vortex breaker 10, which includes a plurality of vortex-breaking protrusions arranged on the inner wall of the inlet end of the telescopic bubble injector. The plurality of vortex-breaking protrusions are arranged circumferentially on the inner wall of the height-difference bubble injector 4. The provision of the vortex-breaking protrusions de-vortexes the swirling micro-nano bubbles, stabilizing the flow of the micro-nano bubbles and reducing the probability of micro-nano bubbles agglomerating and merging.

[0105] Reference Figure 6 As shown, the first lifting mechanism 5 includes a winch 51, a cable 52, a sliding plate 53, a hook 54 and a slider 55. A fixing hole is provided in the middle of the sliding plate 53. Of course, a plurality of flow holes are provided around the central axis of the fixed shaft to allow micro-nano bubbles to pass through.

[0106] The lower end of the height difference bubbler 4 is inserted into the fixed hole. An axial slide groove 11 is provided on the inner wall of the wellbore. The slider 55 is provided on the side of the sliding plate 53, and is slidably provided in the slide groove 11, so that the sliding plate 53 is stuck in the inner cavity of the simulated wellbore 1 and can slide along the axial direction of the simulated wellbore 1. The coordinated arrangement of the sliding plate 53 and the slider 55 can provide a fixing force to the lower end of the height difference bubbler 4. The hook 54 is provided on the upper surface of the sliding plate 53. The winch 51 is provided on the outside of the top of the simulated wellbore 1. One end of the cable 52 is sleeved on the drum of the winch 51, and the other end extends to the interior of the simulated wellbore 1 and is connected to the hook 54.

[0107] In actual operation, when the height difference bubbler 4 needs to be shortened and its depth into the inner cavity of the simulated wellbore 1 is reduced, the hoist 51 winds up the cable 52. Since the other end of the cable 52 extends into the interior of the simulated wellbore 1 and is connected to the hook 54 provided on the upper surface of the sliding plate 53, the cable 52 drives the sliding plate 53 upward. The lower end of the height difference bubbler 4 is inserted into the fixing hole provided in the middle of the sliding plate 53, and the sliding plate 53 drives the sleeves 41 of the height difference bubbler 4 axially upward. When the bottom sleeve 41 moves into place, the sliding plate 53 then abuts the bottom of the second-to-last sleeve 41, providing resistance to it, causing it to move further axially upward, and so on, thereby reducing the height of the height difference bubbler 4. When the length of the height difference bubbler 4 needs to be increased, the hoist 51 releases the cable 52 to achieve this. The movement process is not further described. The slider 55 and the slide groove 11 serve as guides to enable the sliding plate 53 to move axially and smoothly.

[0108] Continue to refer to Figure 6 As shown, the second lifting mechanism 6 includes a drive motor 61, a driving bevel gear 62, a driven bevel gear 63, a screw 64, and a screw seat 65. The output shaft of the drive motor 61 passes through the side wall of the simulated wellbore 1 and is then sleeved with the drive bevel gear 62. The screw 64 is sleeved with the driven bevel gear 63, with both ends fixed to the simulated wellbore 1 with its central axis parallel to the axial direction of the simulated wellbore 1. The driven bevel gear 63 meshes with the driving bevel gear 62, thereby achieving transmission. The screw seat 65 is threadedly mounted on the screw 64. The bubble detection mechanism 7 is disposed on the screw seat 65.

[0109] During actual operation, the driving motor 61 drives the driving bevel gear 62 to rotate, and then drives the driven bevel gear 63 and the screw rod 64 to rotate. Through the threaded matching structure of the screw rod 64 and the screw rod seat 65, the screw rod 64 drives the screw rod seat 65 to move along the axial direction of the simulated wellbore 1, and finally drives the bubble detection mechanism 7 to move axially inside the simulated wellbore 1. The bubble detection mechanism 7 is used to detect the size and density of micro-nano bubbles at different depths inside the simulated wellbore 1 in real time.

[0110] Of course, the driving motor 61 is arranged at the upper part of the simulated wellbore 1 , so as to prevent the input micro-nano bubbles from affecting the operation of the driving bevel gear 62 and the driven bevel gear 63 .

[0111] Furthermore, if Figure 1 and Figure 6 As shown, a plurality of temperature controllers 20 are evenly distributed on the inner wall of the simulated wellbore 1, and the plurality of temperature controllers 20 are electrically connected to the controller. The temperature controller 20 includes an integrated temperature sensor and a heater. The real-time temperature of the inner cavity of the simulated wellbore 1 is detected by the temperature sensor, and the temperature data is sent to the controller, and the heater is controlled by the controller to heat the inner cavity of the simulated wellbore 1, thereby regulating the temperature inside the simulated wellbore 1 to realize the simulation of the injection and migration of micro-nano bubbles in the simulated wellbore 1 under different temperature environments. The temperature inside the simulated wellbore 1 is adjusted between 20°C and 70°C by the temperature controller 20. Optionally, the heater is an electric heating tube.

[0112] Another embodiment of the present invention provides a method for simulating the migration of micro-nano bubbles in a wellbore, comprising:

[0113] The liquid phase pressure and liquid phase flow rate entering the microbubble generator 3 are adjusted to preset values ​​by the liquid phase regulating mechanism 9, and the gas phase pressure and gas phase flow rate entering the microbubble generator 3 are adjusted to preset values ​​by the gas phase regulating mechanism 8. When the simulation device includes multiple temperature controllers 20, the temperature of the inner cavity of the simulated wellbore 1 is also adjusted to a preset value by the temperature controllers 20.

[0114] Micro-nano bubbles are generated by a microbubble generator 3 and fed into a height-differential bubble injector 4, followed by multiple measurement steps. The measurement steps include adjusting the depth of the height-differential bubble injector 4 within the simulated wellbore 1 using a first lifting mechanism 5, adjusting a second lifting mechanism 6 to move a bubble detection mechanism 7 axially along the simulated wellbore 1 to a preset position, determined based on actual measurement requirements, and using the bubble detection mechanism 7 to measure the particle size and density of the micro-nano bubbles within the simulated wellbore 1 in real time.

[0115] The bubble detection mechanism 7 feeds back the detection result to the controller, and the controller controls the liquid phase regulating mechanism 9 to regulate the liquid phase pressure and liquid phase flow, and controls the gas phase regulating mechanism 8 to regulate the gas phase pressure and gas phase flow.

[0116] When the bubble refining structure 37 is included, and the bubble refining structure 37 includes a transmission component 371, a fixed disk 372 and a rotating disk 373, the controller controls the rotation of the transmission component 371 to further refine the micro-nano bubbles.

[0117] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0118] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A simulation device for simulating the migration of micro-nano bubbles in a wellbore, characterized in that: It includes a simulated wellbore, a bracket, a micro-bubble generator, a height difference bubble injector, a first lifting mechanism, a second lifting mechanism, a bubble detection mechanism, a gas phase regulating mechanism, a liquid phase regulating mechanism and a controller; The simulated wellbore is arranged vertically; The support is arranged at the wellhead of the simulated wellbore; The lower end of the microbubble generator is fixedly connected to the upper end of the height difference bubble injector and then inserted into the bracket, and the lower part of the height difference bubble injector is extended into the inner cavity of the simulated wellbore; The first lifting mechanism is connected to the lower end of the height difference bubble injector to adjust the depth of the height difference bubble injector extending into the inner cavity of the simulated wellbore; The second lifting mechanism is arranged on the inner wall of the simulated wellbore; The bubble detection mechanism is provided on the second lifting mechanism and can move axially along the simulated wellbore under the drive of the second lifting mechanism; The gas phase regulating mechanism is arranged on the air inlet end of the microbubble generator; The liquid phase regulating mechanism is arranged on the liquid inlet end of the microbubble generator; The bubble detection mechanism, the gas phase regulating mechanism and the liquid phase regulating mechanism are all electrically connected to the controller; The microbubble generator comprises a top cover, a liquid inlet pipe, an air inlet pipe, a swirl element and a gas-liquid mixing cylinder; The top cover is provided with a first through hole and a second through hole, and is buckled onto the top of the gas-liquid mixing cylinder; The lower end of the gas-liquid mixing cylinder is fixedly connected to the upper end of the height difference bubble injector; The liquid inlet pipe is inserted and fixed in the first through hole; The liquid phase regulating mechanism is arranged on the liquid inlet pipe; The swirl element is a shell having a hollow interior and a third through hole on the top, a spiral groove on the outer wall, and a plurality of fourth through holes penetrating the side wall of the swirl element arranged in the spiral groove; The air intake pipe is inserted into the second through hole, and the end thereof is inserted into the third through hole. The gas phase regulating mechanism is arranged on the air inlet pipe; The outer shape of the side wall of the swirl element is adapted to the shape of the inner wall of the gas-liquid mixing cylinder, and is arranged in the inner cavity of the gas-liquid mixing cylinder, and the outer wall of the swirl element is spaced a preset distance from the inner wall of the gas-liquid mixing cylinder; The gas-liquid mixing cylinder comprises a contraction cylinder section, a throat cylinder section and an expansion cylinder section which are sequentially arranged along the flow direction of the fluid; The inner wall of the shrinking cylinder section is in the shape of a platform, with the large open end serving as the top; The inner wall of the throat section is cylindrical; The inner wall of the expansion barrel section is in a table shape, with the large opening end serving as the bottom; The swirl member is located in the inner cavity of the contraction barrel section.

2. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1, characterized in that: The micro-bubble generator further comprises a clamping disc and a driving cylinder; The air intake pipe includes a first sub-pipe and a second sub-pipe; The clamping plate is clamped to the port of the top cover and is located below the first through hole. A mounting shaft hole is provided in the middle portion, and a plurality of fifth through holes are provided in a circular array around the mounting shaft hole. The first sub-tube is inserted and fixed in the second through hole, and the end thereof is inserted and fixed in the mounting shaft hole; One end of the second sub-tube is inserted into the terminal end of the first sub-tube, and the other end is fixedly inserted into the third through hole, and can be extended and retracted along its own axis; There are multiple driving cylinders, which are arranged in a ring array around the central axis of the second sub-tube, and have two ends respectively connected to the surface of the clamping plate and the upper end of the swirl member.

3. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1 or 2, characterized in that: The microbubble generator also includes a bubble refinement structure; The bubble refinement structure includes at least one, which is sequentially clamped at the output end of the gas-liquid mixing cylinder and is configured to further fracture and refine the foam input therein.

4. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 3, characterized in that: Each of the bubble refinement structures includes a transmission assembly, a fixed disc and a rotating disc; The fixed disc is evenly distributed with a plurality of fifth through holes, which are fixed to the output end of the gas-liquid mixing cylinder; The rotating disc is evenly distributed with a plurality of sixth through holes, which are clamped at the output end of the gas-liquid mixing cylinder and are adjacent to the fixed disc. The number of the sixth through holes is the same as the number of the fifth through holes, and the positions correspond one to one. The transmission assembly is connected to the rotating disc, and can drive the rotating disc to rotate relative to the fixed disc to change the area of ​​the port of the fifth through hole.

5. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1, characterized in that: The height difference bubble injector comprises a plurality of sleeves which are sequentially sleeved; The inner diameter of the upper sleeve is larger than the outer diameter of the lower sleeve, and an inner ring is provided at the bottom of the upper sleeve, and an outer ring is provided at the top of the lower sleeve, and the inner diameter of the inner ring is smaller than the outer diameter of the outer ring; The upper end of the uppermost sleeve is fixedly connected to the lower end of the microbubble generator; The lower end of the lowermost sleeve is connected to the first lifting mechanism.

6. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1 or 5, characterized in that: The first lifting mechanism includes a winch, a cable, a sliding plate, a hook and a slider; A fixing hole is provided in the middle of the sliding plate; The lower end of the height difference bubble injector is inserted and fixed in the fixing hole; The inner wall of the wellbore is provided with an axial sliding groove; The slider is arranged on the side of the sliding plate, and is slidably arranged in the sliding groove, so that the sliding plate is clamped in the inner cavity of the simulated wellbore and can slide along the axial direction of the simulated wellbore; The hook is provided on the upper surface of the sliding plate; The hoist is arranged on the outside of the top of the simulated wellbore; One end of the cable is sleeved on the drum of the winch, and the other end extends to the interior of the simulated wellbore and is connected to the hook.

7. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1, characterized in that: The second lifting mechanism includes a driving motor, a driving bevel gear, a driven bevel gear, a screw and a screw seat; The output shaft of the driving motor passes through the side wall of the simulated wellbore and is then sleeved with the driving bevel gear; The screw rod is sleeved with the driven bevel gear, with both ends fixed to the simulated wellbore and the central axis parallel to the axial direction of the simulated wellbore, and the driven bevel gear is meshed with the driving bevel gear; The screw seat is threadedly fitted on the screw; The bubble detection mechanism is arranged on the screw seat.

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