Simulation device and simulation method for simulating migration of micro-nano bubbles in shaft

Abstract

The invention discloses a simulation device and a simulation method for simulating migration of micro-nano bubbles in a shaft, and belongs to the field of micro-nano bubble migration simulation. A simulation shaft of the simulation device is vertically arranged; the support is arranged at a wellhead of the simulation wellbore. The lower end of the microbubble generator is fixedly connected with the upper end of the height difference bubble injector and then is inserted and fixed on the bracket; the first lifting mechanism is connected with the lower end of the height difference bubble injector so as to adjust the depth of the height difference bubble injector extending to the inner cavity of the simulation shaft; the second lifting mechanism is arranged on the inner wall of the simulation shaft; the bubble detection mechanism is arranged on the second lifting mechanism and can be driven by the second lifting mechanism to move in the axial direction of the simulation shaft. The gas phase adjusting mechanism is arranged at the gas inlet end of the microbubble generator; the liquid phase adjusting mechanism is arranged at the liquid inlet end of the microbubble generator; and the bubble detection mechanism, the gas phase adjusting mechanism and the liquid phase adjusting mechanism are electrically connected with the controller. According to the device, workers can effectively regulate and control the pressure, the flow speed and the like of the micro-nano foam with reference.

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 is a technology that improves oil field recovery efficiency by injecting microfoam fluid into the formation. Since microfoam flooding technology has the advantages of improving sweep coefficient and oil washing efficiency, it has become one of the effective means to improve crude oil recovery in the process of crude oil extraction in the field of oil extraction. Compared with ordinary foam, microfoam has the advantages of fine bubbles, good stability, and excellent variability. Its injectability and deep plugging ability in the process of crude oil extraction are better than ordinary foam. In actual use, the injectability and deep plugging ability of microfoam are affected by its foam particle size.

[0003] At present, due to the uncontrollable factors such as pressure and flow rate in the preparation process of micro-nano foam, the final micro-nano bubbles merge with each other, which in turn causes the problem of excessive particle size of micro-nano bubbles. At present, there is a lack of effective detection methods for the migration of micro-nano foam in the wellbore, which makes it impossible for the staff to effectively control the pressure and flow rate of the micro-nano foam according to the actual migration of the micro-nano foam in the wellbore. 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, thereby solving the problem that there is currently a lack of effective means to detect the migration of micro-nano foams in a wellbore, making it impossible for staff to effectively regulate the pressure, flow rate, etc. of the micro-nano foams according to the actual migration of the micro-nano foams in the wellbore.

[0005] In order to achieve the above object, 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 in that it includes a simulated wellbore, a bracket, 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 to 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 arranged 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 gas 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 element, 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 on 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 is provided on the outer wall, and a plurality of fourth through holes penetrating the side wall of the swirl element are arranged at the spiral groove;

[0022] The air inlet pipe is inserted and fixed in the second through hole, and the end thereof is inserted and fixed in the third through hole;

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

[0024] The outer shape of the side wall of the swirl element is matched with 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 which are sequentially arranged along the flow direction of the fluid;

[0026] The inner wall of the contraction barrel section is in a table shape, and the large opening end serves as the top;

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

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

[0029] The swirl element 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 comprises 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, 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 inserted and fixed into the third through hole, and can be extended and retracted along its own axial direction;

[0035] There are multiple driving cylinders, which are arranged in a circular array around the central axis of the second sub-tube, and the two ends of the driving cylinders are 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 thinning structures includes a transmission assembly, a fixed disc and a rotating disc;

[0039] The fixed disc body 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 body 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 close to the fixed disc body. The number of the sixth through holes is consistent with 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 which are sequentially sleeved;

[0043] The inner diameter of the upper sleeve is larger than the outer diameter of the lower sleeve, and an inner edge ring is provided at the bottom of the upper sleeve, and an outer edge ring is provided at the top of the lower sleeve, and the inner diameter of the inner edge ring is smaller than the outer diameter of the outer edge 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 arranged 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 sleeved 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 simulation 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 inner cavity through the 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 inner cavity in real time through 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 the liquid phase flow rate, and controls the gas phase regulating mechanism to regulate the gas phase pressure and the gas phase flow rate.

[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, when actually conducting a simulation experiment, first assemble the simulation device, then adjust the liquid phase pressure and liquid phase flow entering the microbubble generator to a preset value through a liquid phase regulating mechanism, adjust the gas phase pressure and gas phase flow entering the microbubble generator to a preset value through a gas phase regulating mechanism, generate micro-nano bubbles through the microbubble generator and input them into the height difference bubble injector, and then perform the measurement steps multiple times. The measurement steps include: adjusting the height difference bubble injector to extend to the depth of the inner cavity of the simulated wellbore through 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 extending into the inner cavity of the simulated wellbore at the lower part, and during the injection process, the particle size and density of the micro-nano bubbles in the inner cavity of the simulated wellbore are detected in real time by the bubble detection mechanism. By performing the measurement steps multiple times, the size and density of micro-nano bubbles at different depths of the simulated wellbore can be measured. The bubble detection mechanism wirelessly or wiredly feeds back the detection result to the controller, and the controller regulates the liquid phase regulating mechanism to regulate the liquid phase pressure and liquid phase flow, and regulates the gas phase regulating mechanism to regulate 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 to reach the target value, and dynamically regulates the size and density of the micro-nano bubbles finally injected into the simulated wellbore in real-time feedback. 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 under different liquid phase and gas phase injection parameter conditions, and dynamically regulate the injection parameters of the micro-nano bubbles according to the detection results, and 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 in practice can effectively regulate the pressure, flow rate, etc. of the micro-nano foam according to the reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying 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 The enlarged view of point A in the middle;

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

[0070] Figure 4 A schematic diagram of the structure 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 A schematic diagram of the structure of the lower portion of a simulation device for simulating the migration of micro-nano bubbles in a wellbore 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-fixing plate; 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 - lead screw; 65 - lead screw seat; 7 - bubble detection mechanism; 8 - gas phase regulating mechanism; 9 - liquid phase regulating mechanism; 10 - vortex breaker; 20 - temperature controller. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 positions or positional relationships based on the positions 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, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. 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 support 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 vertically arranged. 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. The axial height is preferably 10m to 20m.

[0078] The bracket 2 is arranged 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 the 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, so as 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 arranged on 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 arranged on 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 the controller. A controller with model number STC89C52 can be used. The liquid phase regulating mechanism 9 includes a liquid phase pressure regulating valve group and a liquid phase flow regulating valve group that are coupled, and the gas phase regulating mechanism 8 includes a gas phase pressure regulating valve group and a gas phase flow regulating valve group that are coupled.

[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 the embodiment of the present invention, when actually conducting a simulation experiment, first assemble the simulation device, then adjust the liquid phase pressure and liquid phase flow entering the micro-bubble generator 3 to a preset value through the liquid phase regulating mechanism 9, adjust the gas phase pressure and gas phase flow entering the micro-bubble generator 3 to a preset value through the gas phase regulating mechanism 8, generate micro-nano bubbles through the micro-bubble generator 3 and input them into the height difference bubble injector 4, and then perform the measurement step multiple times. The measurement step includes: adjusting the depth of the height difference bubble injector 4 extending to the inner cavity of the simulated wellbore 1 through 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 micro-bubble generator 3 is fixedly connected to the upper end of the height difference bubble injector 4, the micro-bubble generator 3 generates micro-nano bubbles, and injects micro-nano bubbles into the simulated wellbore 1 through the height difference bubble injector 4 extending into the inner cavity of the simulated wellbore 1 at the lower part, and during the injection process, the particle size and density of the micro-nano bubbles in the inner cavity of the simulated wellbore 1 are detected in real time by the bubble detection mechanism 7. By repeatedly performing the measurement steps, the size and density of micro-nano bubbles at different depths of the simulated wellbore 1 can be measured. The bubble detection mechanism 7 wirelessly or wiredly feeds back the detection results to the controller, and the controller adjusts the liquid phase adjustment mechanism 9 to adjust the liquid phase pressure and liquid phase flow, and adjusts the gas phase adjustment mechanism 8 to adjust the gas phase pressure and gas phase flow, thereby adjusting the size and density of the micro-nano bubbles generated by the bubble detection mechanism 7 to reach the target value, and dynamically adjusts the size and density of the micro-nano bubbles finally injected into the simulated wellbore 1 in real-time feedback. The simulation device of the embodiment of the present invention can dynamically adjust 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 adjust the injection parameters of the micro-nano bubbles according to the detection results, and 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 in practice can effectively adjust the pressure, flow rate, etc. of the micro-nano foam according to the 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 on 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 in the first through hole. Figure 5As shown, the swirl member 33 is a shell with a hollow interior and a third through hole on the top, a spiral groove 331 is provided on the outer wall, and a plurality of fourth through holes 332 are arranged at the spiral groove 331 and penetrate the side wall of the swirl member 33. The air inlet pipe 32 is fixed to the second through hole, and the end is inserted and fixed to the third through hole, so that the air inlet pipe 32 transports the input gas to the inner cavity of the swirl member 33, and the inner cavity of the swirl member 33 serves as an air cavity. The gas phase regulating mechanism 8 is arranged on the air inlet pipe 32, and is located outside the top cover 30.

[0084] like Figure 1 As shown, the liquid inlet pipe 31 is generally arranged on the side wall of the top cover 30, so the liquid inlet pipe 31 is arranged on the side wall of the top cover 30, so as to facilitate the arrangement of the swirl member 33, and facilitate the connection between the air inlet pipe 32 and the swirl member 33, and the air inlet pipe 32 does not need to be bent. The liquid phase regulating mechanism 9 is arranged on the liquid inlet pipe 31, and is 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 microbubble generator 3, so that liquid can be easily input into the inner cavity of the microbubble generator 3, gas is not easy to flow away, and the generated micro-nano bubbles are not easy to overflow.

[0086] The shape of the side wall of the swirl element 33 is adapted to the shape of the inner wall of the gas-liquid mixing cylinder 34, and is arranged in the inner cavity of the gas-liquid mixing cylinder 34. The outer wall of the swirl element 33 and the inner wall of the gas-liquid mixing cylinder 34 are spaced at a preset distance, thereby forming a gas-liquid mixing annular cavity. In actual use, the gas phase is input from the air inlet pipe 32 and then transported to the gas cavity of the swirl element 33, and then uniformly sprayed 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 cylinder 34, and enters the gas-liquid mixing annular cavity after being fully mixed with the gas phase at the spiral groove 331 to form a swirl flow. The bubbles in the liquid are fully cleaved and broken by the swirl shear force to efficiently generate dense micro-nano foams, and then the micro-nano foams flow 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 contraction cylinder section 341, a throat section 342 and an expansion cylinder section 343 which are sequentially arranged along the fluid flow direction. The inner wall shape of the contraction cylinder section 341 is a table shape, and the large opening end is used as the top. Of course, in order to facilitate the 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 contraction cylinder section 341, the extension ring 346 is arranged on the outer wall of the upper port of the straight cylinder section 345, and 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 in the shape of a table, and the large opening end is used as the bottom. The swirl member 33 is located in the inner cavity of the contraction section 341. At this time, the lower part of the swirl member 33 is in the shape of a table to match the shape of the contraction section 341.

[0089] The gas-liquid mixing cylinder 34 provided in the embodiment of the present application, the liquid phase entering from the liquid inlet pipe 31 flows into the contraction cylinder section 341, flows through the spiral groove 331 set on the surface of the swirl member 33 in the contraction cylinder section 341, so that the liquid phase enters the contraction cylinder section 341 and swirls along the spiral groove 331, thereby generating a swirl shear force, and the gas mixed with the gas flowing out from the fourth through hole 332 of the swirl member 33 is swirled into micro-nano bubbles, ensuring the shear cracking of the bubbles in the liquid. By setting the contraction cylinder section 341 with a contraction at the front end, the throat section 342 with a transition in the middle, and the expansion cylinder section 343 with an expansion at the rear end, the diameter of the contraction cylinder section 341 is gradually reduced, so that the fluid flow rate and pressure are increased, the axial flow speed and pressure of the fluid are ensured, and the micro-nano bubbles are further cracked and fragmented, and fine micro-nano bubbles are obtained efficiently. Then the fluid passes through the throat section 342. The outflow to the expansion cylinder section 343 is gradually decelerated 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 clamping 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 clamping plate 35 is clamped 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, 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 barrel section 341. The first sub-tube is penetrated and 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 retracted along its own axial direction. 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 the two ends of the driving cylinders 36 are respectively connected to the surface of the clamping plate 35 and the upper end of the swirl member 33 .

[0092] The microbubble generator 3 provided in the embodiment of the present application, because the clamping plate 35 is clamped to the port of the top cover 30, 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 clamping plate 35 and the upper end of the swirl member 33, and the second sub-tube can be 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, so as 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, and the pressure of the liquid when swirls along the spiral groove 331 becomes larger, thereby increasing the swirl shear force. On the contrary, if the preset distance between the swirl channel and the inner wall of the contraction barrel section 341 increases, the swirl shear force becomes smaller.

[0093] At this time, the second sub-tube is adaptively axially extended, and one end of the second sub-tube is inserted into the end opening of the first sub-tube, and the other end is inserted and fixed into 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 shape of the flow guide 38 is a platform shape, so that the outer wall surface of the flow guide 38 is an arc surface, and an axial through hole is provided in the middle of the flow guide 38 so that the flow guide 38 is sleeved on the first sub-tube and located above the clamping plate 35, and the lower surface is attached to the upper surface of the clamping plate 35. The flow guide 38 can guide the liquid phase input from the liquid inlet pipe 31, so that the liquid phase flows into the contraction barrel section 341 more smoothly and concentratedly.

[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 (can be one, two, three, etc., such as Figure 1 and Figure 2 The bubble refinement structure 37 is a schematic diagram of a structure. ) is sequentially clamped at the output end of the gas-liquid mixing cylinder 34, and is configured to further fracture and refine the foam input therein, so that the large-size micro-nano bubbles flowing out of the gas-liquid mixing cylinder 34 are again fractured 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 are 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 may be arranged first and then the rotating disk 373 may be arranged along the bubble flow direction (eg Figure 2 As shown in the figure, the rotating disk 373 can be set first and then the fixed disk 372, and the fixed disk 372 and the rotating disk 373 only need to be set close to each other. The specific working process is: the transmission component 371 drives the rotating disk 373 to rotate relative to the fixed disk 372, so that the sixth through hole 373a on the rotating disk 373 is aligned or staggered with the fifth through hole 372a on the fixed disk 372, thereby dynamically adjusting the port area of ​​the fifth through hole 372a, and further fracturing and refining the bubbles with larger particle sizes in the micro-nano foam. Specifically, Figure 2 Taking the schematic diagram of as an example, along the foam flow direction, the fixed disk 372 is first set and then the rotating disk 373 is set. When the area of ​​the lower side port of the fifth through hole 372a of the fixed disk 372 needs to be changed, the transmission component 371 works. Since the transmission component 371 is connected to the rotating disk 373, the transmission component 371 drives the rotating disk 373 to rotate relative to the fixed disk 372. The number of the sixth through holes 373a of the rotating disk 373 is consistent with the number of the fifth through holes 372a on the fixed disk 372 and the positions correspond one to one. When the center axis of the sixth through hole 373a is aligned with the fifth through hole 372a, the transmission component 371 drives the rotating disk 373 to rotate relative to the fixed disk 372. 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 fifth through hole 372a will be reduced, and 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 gear ring 371c. A driving cavity is arranged on the inner wall of the mounting cylinder section 344 of the gas-liquid mixing cylinder 34. A driving wheel 371a is rotatably arranged inside the driving cavity, and the inner wall surface of the driving cavity that matches the driving surface of the driving wheel 371a is an arc surface. Figure 3 As shown, a driving liquid input channel 371d and a driving liquid output channel 371e are provided on the cavity wall of the driving cavity. The inflow direction of the driving liquid input channel 371d and the outflow direction of the driving liquid output channel 371e are both tangent to the cambered surface. The driving liquid input channel 371d is connected to the liquid inlet pipeline, and the driving liquid output channel 371e is connected to the liquid outlet pipeline, and the liquid inlet pipeline and the liquid outlet pipeline are both connected to the pump station.

[0099] The driving gear 371b is connected to the output shaft of the driving wheel 371a. The gear ring 371c is sleeved on the rotating disk 373 and meshed with the driving gear 371b. The driving wheel 371a can be a paddle wheel, which is easy to obtain, light in weight, and easily driven to rotate by the driving fluid. The specific working process is: the pump station inputs the driving fluid into the driving cavity through the liquid inlet pipeline, and the driving wheel 371a inside the driving cavity is impacted by the driving fluid and rotates, thereby driving the driving gear 371b to rotate, and the driving gear 371b is meshed with the gear ring 371c, and the gear ring 371c is sleeved on the rotating disk 373, and then the gear ring 371c 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 arranged in the inner cavity of the simulated wellbore 1, and the detected data are sent wirelessly or wired to the controller. The controller sends control instructions to the liquid phase regulating mechanism 9, the gas phase regulating mechanism 8, and the bubble refinement structure 37 according to the detected data, and adjusts the liquid phase pressure and liquid phase flow rate entering the microbubble generator 3 through the liquid phase regulating mechanism 9, adjusts the gas phase pressure and gas phase flow rate entering the microbubble generator 3 through the gas phase regulating mechanism 8, and adjusts the area of ​​the fifth through hole 372a port through the bubble refinement structure 37, thereby dynamically adjusting 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 barrel section 344 is helpful for setting the fixed disc 372 and the rotating disc 373, and can make the fixed disc 372 and the rotating disc 373 have the same area, so it is more convenient to set the fifth through holes 372a and the sixth through holes 373a with the same number and corresponding positions. At the same time, since the expansion barrel section 343 is a platform-shaped body with a large opening at the lower end, the installation of the barrel section 344 is helpful for returning the micro-nano bubbles flowing out of the expansion barrel section 343 to flow into 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 edge ring, and the top of the lower sleeve 41 is provided with an outer edge ring, and the inner diameter of the inner edge ring is smaller than the outer diameter of the outer edge 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, so that the height of the height difference bubble injector 4 becomes longer or shorter, and axial telescopic expansion is realized. Due to the arrangement of the inner edge ring and the outer edge ring, the lower sleeve 41 will not fall 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 injecting micro-nano foam at different depths inside the simulated wellbore 1, and simulating the migration of micro-nano foam at different depths inside the wellbore.

[0104] Further, such as Figure 2 and Figure 6 As shown, a vortex breaker 10 is provided at the inlet end of the telescopic bubble injector, and the vortex breaker 10 includes a plurality of vortex breaker protrusions provided on the inner wall of the inlet end of the telescopic bubble injector tube, and the plurality of vortex breaker protrusions are circumferentially provided on the inner wall of the height difference bubble injector 4. The vortex breaker protrusions are provided to de-vortex the micro-nano bubbles of the vortex flow, so that the flow of the micro-nano bubbles tends to be stable, and the probability of the micro-nano bubbles agglomerating and merging is reduced.

[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 axis so that micro-nano bubbles can pass through.

[0106] The lower end of the height difference bubbler 4 is inserted and fixed in the fixing hole. An axial slide groove 11 is provided on the inner wall of the wellbore. The slider 55 is arranged on the side of the sliding plate 53, and is slidably arranged 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 arranged on the upper surface of the sliding plate 53. The winch 51 is arranged 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] The first lifting mechanism 5 provided in the embodiment of the present invention, in actual operation, when the length of the height difference bubbler 4 needs to be shortened and the depth of the inner cavity of the simulated wellbore 1 becomes smaller, the winch 51 winds up the cable 52, and since the other end of the cable 52 extends to the inside of the simulated wellbore 1 and is connected to the hook 54, the hook 54 is arranged on the upper surface of the sliding plate 53, so that the cable 52 drives the sliding plate 53 to move upward, and the lower end of the height difference bubbler 4 is inserted into the fixing hole arranged in the middle of the sliding plate 53, so that the sliding plate 53 drives the sleeve 41 of the height difference bubbler 4 to move upward axially, and when the bottom sleeve 41 moves into place, the sliding plate 53 then abuts against the bottom of the penultimate sleeve 41, giving it a resistance force, so that it further moves axially upward, and so on, thereby reducing the height of the height difference bubbler 4. When the length of the height difference bubbler 4 is required, the winch 51 releases the cable 52 to achieve it, and the movement process is not repeated. The slider 55 and the slide groove 11 serve as guides to enable the slide plate 53 to move axially and smoothly.

[0108] Continue to refer to Figure 6 As shown, the second lifting mechanism 6 includes a driving 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 driving motor 61 passes through the side wall of the simulated wellbore 1 and is sleeved with the driving bevel gear 62. The screw 64 is sleeved with the driven bevel gear 63, and both ends are fixed to the simulated wellbore 1 and the central axis is parallel to the axial direction of the simulated wellbore 1, and the driven bevel gear 63 is meshed with the driving bevel gear 62, so as to realize transmission. The screw seat 65 is threadedly sleeved on the screw 64. The bubble detection mechanism 7 is arranged 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 axially along 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 thermostats 20 are evenly distributed on the inner wall of the simulated wellbore 1, and the plurality of thermostats 20 are electrically connected to the controller. The thermostat 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, so as 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 thermostat 20. Optionally, the heater is an electric heating tube.

[0112] Another embodiment of the present invention provides a simulation 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 a plurality of temperature controllers 20, the temperature of the inner cavity of the simulated wellbore 1 is also adjusted to a preset value by the temperature controller 20.

[0114] Micro-nano bubbles are generated by the micro-bubble generator 3 and input into the height difference bubble injector 4, and then the measurement step is performed multiple times. The measurement step includes: adjusting the height difference bubble injector 4 to extend to the depth of the inner cavity of the simulated wellbore 1 through 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, and the preset position is determined according to the actual measurement requirements, and the particle size and density of the micro-nano bubbles in the inner cavity of the simulated wellbore 1 are detected in real time by the bubble detection mechanism 7.

[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 refinement structure 37 is included, and the bubble refinement structure 37 includes a transmission component 371, a fixed disk 372 and a rotating disk 373, the controller controls the transmission component 371 to rotate so as 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 may still be modified, or some or all of the technical features thereof may 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 support, 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 to 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 arranged 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 gas 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 adjustment mechanism and the liquid phase adjustment mechanism are all electrically connected to the controller.

2. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1, characterized in that: 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 on 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 is provided on the outer wall, and a plurality of fourth through holes penetrating the side wall of the swirl element are arranged at the spiral groove; The air inlet pipe is inserted and fixed in the second through hole, and the end thereof is inserted and fixed in the third through hole; The gas phase regulating mechanism is arranged on the air intake pipe; The outer shape of the side wall of the swirl element is matched with 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.

3. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 2, characterized in that: The gas-liquid mixing cylinder comprises a contraction cylinder section, a throat cylinder section and an expansion cylinder section which are arranged in sequence along the flow direction of the fluid; The inner wall of the contraction barrel section is in a table shape, and the large opening end serves as the top; The inner wall shape of the throat section is columnar; The inner wall of the expansion barrel section is in a table shape, and the large opening end serves as the bottom; The swirl element is located in the inner cavity of the contraction barrel section.

4. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 3, characterized in that: The micro-bubble generator also includes a clamping plate and a driving cylinder; The air intake pipe comprises 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, 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 inserted and fixed into the third through hole, and can be extended and retracted along its own axial direction; There are multiple driving cylinders, which are arranged in a circular array around the central axis of the second sub-tube, and the two ends of the driving cylinders are respectively connected to the surface of the clamping plate and the upper end of the swirl member.

5. The device for simulating the migration of micro-nano bubbles in a wellbore according to any one of claims 2 to 4, 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.

6. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 5, characterized in that: Each of the bubble refinement structures comprises a transmission assembly, a fixed disc and a rotating disc; The fixed disc body 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 body 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 close to the fixed disc body. The number of the sixth through holes is consistent with 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.

7. 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 edge ring is provided at the bottom of the upper sleeve, and an outer edge ring is provided at the top of the lower sleeve, and the inner diameter of the inner edge ring is smaller than the outer diameter of the outer edge 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.

8. The device for simulating the migration of micro-nano bubbles in a wellbore according to claim 1 or 7, 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 arranged 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.

9. 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 sleeved on the screw; The bubble detection mechanism is arranged on the screw seat.

10. A method for simulating the migration of micro-nano bubbles in a wellbore, characterized in that: include: 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; 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; The measuring step includes: adjusting the height difference bubble injector to extend to the depth of the simulated wellbore inner cavity through the 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 inner cavity in real time through the bubble detection mechanism; 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 the liquid phase flow rate, and controls the gas phase regulating mechanism to regulate the gas phase pressure and the gas phase flow rate.

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