Gas-liquid mixing disturbance sand discharging device

Abstract

This application relates to the technical field of borehole sand removal equipment, specifically a gas-liquid mixing and disturbance sand removal device. In use, liquid and gas enter the casing separately, driven by a vortex generation unit to generate high-speed rotating flow. During this rotation, the gas and liquid undergo initial shear mixing. The mixed fluid enters the interior of a spiral tube. As it travels at high speed along the spiral tube, the micropores on the tube wall create a throttling shear effect, causing the gas-liquid mixture to be ejected as a microjet, generating a large number of uniform microbubbles and forming a highly disturbed gas-liquid two-phase mixture. The mixture enters the pressurization unit, where it converges in the contraction section, accelerates in the throat, and is pressurized in the diffusion section, transforming into a high-speed jet rich in microbubbles, which is ejected from the mixing outlet. The microbubbles expand and burst within the directional borehole, generating strong local turbulence, effectively lifting rock dust deposited in low-angle borehole sections, eliminating dead water zones in the spiral borehole and rock debris accumulation in the dogleg sections, thereby improving the sand removal efficiency for complex directional boreholes.

Description

Technical Field

[0001] This application relates to the field of drilling sand removal equipment technology, and in particular to a gas-liquid mixing disturbance sand removal device. Background Technology

[0002] In directional drilling, horizontal drilling, and small-angle drilling operations, conventional water or mud slurry slag removal commonly presents the following challenges: 1. Rock powder in low-angle holes is prone to sinking to the bottom due to gravity, and the flow rate is insufficient to lift and discharge the slag; 2. The spiral trajectory directional hole has an eccentric annulus and local dead water zone, which makes it easy for rock debris to accumulate; 3. In bends with large doglegs, the flow velocity drops sharply, and a large amount of rock cuttings accumulate, which can easily lead to accidents such as stuck drill, buried drill, and burnt drill. 4. Existing gas-filled drilling equipment lacks a dedicated mixing structure and only uses a simple three-way mixing method, resulting in large bubbles, uneven mixing, and no strong disturbance capability; 5. Some equipment has the risk of gas-liquid cross-contamination and poor pressure matching, making it unsuitable for long-term use under stable field conditions.

[0003] Therefore, how to improve the sand removal efficiency of directional holes is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides a gas-liquid mixing disturbance sand removal device to improve the sand removal efficiency of directional holes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A gas-liquid mixing disturbance sand removal device, comprising: A housing having a liquid inlet, a gas inlet, and a mixing outlet; A swirl generating unit disposed inside the housing is configured to receive liquid and gas entering through the liquid inlet and the gas inlet, and to form a swirling gas-liquid mixture of the liquid and gas. A microbubble generating unit is disposed inside the housing and downstream of the swirl generating unit. The microbubble generating unit includes a helical tube. The first end of the helical tube is connected to the swirl generating unit and is used to receive the gas-liquid mixture. The tube wall of the helical tube has multiple micropores. A pressurizing unit is disposed inside the housing, between the microbubble generating unit and the mixing outlet. The pressurizing unit has a constriction section, a throat, and a diffusion section connected in sequence. The constriction section is arranged near the second end of the spiral tube, and the diffusion section is connected to the mixing outlet.

[0006] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, at least one of the transition portion between the contraction section and the throat, or the transition portion between the throat and the diffusion section, is configured as an arc-shaped surface.

[0007] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, the swirl generation unit includes at least one set of inclined guide vanes fixed to the inner wall of the shell, and the guide surface of the guide vanes has an inclined angle with the axis of the shell.

[0008] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, the vortex generation unit includes a first cavity, the liquid inlet and the gas inlet are connected to the first cavity, the guide vanes are disposed on the inner wall of the first cavity, and the guide vanes are arranged close to the liquid inlet and the gas inlet.

[0009] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, the axial direction of the liquid inlet is parallel to the axial direction of the first cavity, and the axial direction of the gas inlet is perpendicular to the axial direction of the first cavity.

[0010] Optionally, the above-mentioned gas-liquid mixing disturbance sand removal device further includes a baffle plate. The microbubble generating unit includes a second cavity. The baffle plate is connected to the inner wall of the shell. One side of the baffle plate and the inner wall of the shell enclose the first cavity, and the other side of the baffle plate and the inner wall of the shell enclose the second cavity. The spiral tube is arranged inside the second cavity. The baffle plate has a through hole. The first end of the spiral tube is connected to the through hole, and the second end of the spiral tube extends along the axial direction of the second cavity.

[0011] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, the contraction section has a first large-diameter end and a first small-diameter end, and the first large-diameter end is arranged close to the second end of the spiral tube, and the first small-diameter end is connected to the first end of the throat. The throat is a straight pipe section, and the ratio of the length of the straight pipe section to its inner diameter is greater than or equal to 3.

[0012] Optionally, the above-mentioned gas-liquid mixing disturbance sand removal device further includes a drill rod and a drill bit. The diffusion section has a second large diameter end and a second small diameter end, and the second large diameter end is connected to the second end of the throat. The second small diameter end is connected to the first end of the drill rod, and the drill bit is connected to the second end of the drill rod.

[0013] Optionally, in the above-mentioned gas-liquid mixing disturbance sand removal device, the diameter of the spiral tube gradually decreases along the direction from the first end of the spiral tube to the second end of the spiral tube; Alternatively, the diameter of the micropores gradually decreases along the direction from the first end to the second end of the spiral tube.

[0014] Optionally, the above-mentioned gas-liquid mixing disturbance and sand removal device further includes an air compressor and a high-pressure water pump. A first check valve is provided between the air compressor and the gas inlet, and a second check valve is provided between the high-pressure water pump and the liquid inlet.

[0015] The gas-liquid mixing disturbance sand removal device provided by this invention allows liquid and gas to enter the shell through the liquid inlet and gas inlet, respectively. Driven by a vortex generation unit, they generate high-speed rotating flow, during which the gas and liquid undergo preliminary shear mixing. The mixed fluid then enters the spiral tube. As it travels at high speed along the spiral tube, the dense micropores on the tube wall create a throttling shear effect, causing some of the gas-liquid mixture to be ejected as micro-jet streams, generating a large number of uniform microbubbles and forming a highly disturbed gas-liquid two-phase mixture. This mixture then enters the pressurization unit, where it converges in the contraction section, accelerates in the throat, and is pressurized in the diffusion section, transforming into a high-speed jet stream rich in microbubbles. This jet exits from the mixing outlet and specifically enters the bottom of the directional borehole. The microbubbles expand and burst within the borehole, generating strong local turbulence. This effectively lifts rock dust deposited in low-angle borehole sections, eliminates dead water zones in the spiral borehole and rock debris accumulation in the dogleg sections, and allows sediment to be smoothly discharged with the circulating liquid flow, thereby improving the sand removal efficiency for complex directional boreholes. Attached Figure Description

[0016] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort. One or more embodiments are illustrated by way of example through the corresponding images in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0017] Figure 1 This is a schematic diagram of the structure of the gas-liquid mixing disturbance sand removal device provided in the embodiments of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Shell, 2. First cavity, 3. Second cavity, 4. Spiral tube, 5. Micropore, 6. Contraction section, 7. Throat, 8. Diffusion section, 9. Partition, 10. Drill rod, 11. Drill bit, 12. Air compressor, 13. High-pressure water pump, 14. First check valve, 15. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0021] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0022] See Figure 1This application provides a gas-liquid mixing disturbance sand removal device, comprising: a shell 1 having a liquid inlet, a gas inlet, and a mixing outlet; a swirl generating unit disposed inside the shell 1, configured to receive liquid and gas entering through the liquid inlet and the gas inlet, and to form a rotating gas-liquid mixture; a microbubble generating unit disposed inside the shell 1 and downstream of the swirl generating unit, the microbubble generating unit including a spiral tube 4, the first end of the spiral tube 4 being connected to the swirl generating unit for receiving the gas-liquid mixture, the tube wall of the spiral tube 4 having multiple micropores 5; and a pressurizing unit disposed inside the shell 1 and between the microbubble generating unit and the mixing outlet, the pressurizing unit having a constriction section 6, a throat 7, and a diffuser section 8 connected in sequence, the constriction section 6 being arranged near the second end of the spiral tube 4, and the diffuser section 8 being connected to the mixing outlet.

[0023] Specifically, the swirl generation unit receives two independent streams of liquid and gas, causing them to rotate at high speed. The microbubble generation unit is located downstream of the swirl generation unit, and the first end of the spiral tube 4 is directly connected to the outlet of the swirl generation unit, receiving the gas-liquid mixture in its entire rotating state. Under the constraint of the spiral flow channel of the spiral tube 4, the gas-liquid mixture continues to travel spirally along the tube wall, generating centrifugal inertial force during this process. This force drives a portion of the gas-liquid mixture to be ejected at high speed from the uniformly arranged micropores 5 on the tube wall. The aperture of the micropores 5 can range from 0.1 mm to 1.0 mm. At the orifice, the jet stream is torn into a cluster of tiny microbubbles by strong external shearing or throttling effects, forming a uniformly dispersed gas-liquid two-phase mixture. The inlet of the contraction section 6 receives the residual fluid discharged from the second end of the spiral tube 4 and the microbubble fluid collected after being ejected from the micropore 5. As the flow area of ​​the contraction section 6 gradually decreases, the speed increases sharply, forming a high-speed and stable gas-liquid two-phase flow at the throat 7 with the smallest cross-section. Then, the pressure is restored through the diffusion section 8, and it is transformed into a high-speed jet flow rich in microbubbles, which is directionally ejected from the mixing outlet.

[0024] The gas-liquid mixing disturbance sand removal device provided by this invention allows liquid and gas to enter the shell 1 through the liquid inlet and gas inlet, respectively. Driven by the vortex generation unit, they generate high-speed rotating flow, and the gas and liquid undergo preliminary shear mixing during rotation. The mixed fluid then enters the spiral tube 4. As it travels at high speed along the spiral tube 4, the dense micropores 5 on the tube wall create a throttling shear effect, causing some of the gas-liquid mixture to be ejected as micro-jet streams, generating a large number of uniform microbubbles and forming a highly disturbed gas-liquid two-phase mixture. This mixture then enters the pressurization unit, where it converges in the contraction section 6, accelerates in the throat 7, and is pressurized in the diffusion section 8, transforming into a high-speed jet stream rich in microbubbles. This jet stream exits from the mixing outlet and specifically enters the bottom of the directional borehole. The microbubbles expand and burst within the borehole, generating strong local turbulence, effectively lifting rock dust deposited in low-angle borehole sections, eliminating dead water zones in the spiral borehole and rock debris accumulation in the dogleg sections, allowing sediment to be smoothly discharged with the circulating liquid flow, thereby improving the sand removal efficiency for complex directional boreholes.

[0025] It should be noted that "dogleg section" is an industry-standard description used in this field for local bends in the wellbore trajectory where the curvature changes drastically and a large dogleg degree is present.

[0026] It is understandable that "local turbulence" can be caused by the expansion and rupture of microbubbles within the pores, and the range and intensity of the disturbance can be controlled by adjusting the gas content and the microbubble size distribution.

[0027] To optimize the above technical solution, at least one of the transition portion between the contraction segment 6 and the throat 7, or the transition portion between the throat 7 and the diffusion segment 8, is configured as an arc-shaped surface.

[0028] Specifically, by arranging arc-shaped surfaces, the contraction section 6 and the throat 7, and the throat 7 and the diffuser section 8 form a continuous arc transition, thereby making the cross-sectional area of ​​the flow channel gradually change rather than abruptly, thus avoiding the generation of corner vortices and boundary layer separation at the diameter change point.

[0029] An arc-shaped surface is provided between the contraction section 6 and the throat 7, which enables the rotating two-phase mixture to enter the throat 7 with continuous acceleration rather than abrupt acceleration, reducing the non-uniform shear force on the bubbles at this point and ensuring that they enter the throat 7 in the form of fine microbubbles.

[0030] An arc-shaped curved surface is set between the throat 7 and the diffuser section 8, which enables the two-phase flow after high speed through the throat 7 to diffuse and slow down smoothly, avoids the loss of turbulent kinetic energy caused by flow wall separation, and makes microbubbles uniformly dispersed in the liquid flow and ejected.

[0031] From the perspective of overall sand removal effect, the curved surface can reduce the internal flow resistance of the pressurization unit and improve the energy utilization rate. It ensures that under the same output power of air compressor 12 and high-pressure water pump 13, the core area of ​​the jet ejected from the mixing outlet has a higher velocity and a longer effective spray distance. This allows for higher kinetic energy to impact and disturb the thicker and more compacted sediment layer at the bottom of the hole, thereby improving the slag removal effect.

[0032] To optimize the above technical solution, the swirl generation unit includes at least one set of inclined guide vanes fixed to the inner wall of the housing 1, and the guide surface of the guide vanes has an inclined angle with the axis of the housing 1.

[0033] Specifically, the guide vanes are fixed to the inner wall of the housing 1 and arranged in a ring array or in a spiral arrangement around the inner wall of the housing 1. The guide surface and the axis of the housing 1 form an inclined angle, which can be selected from 15° to 60°.

[0034] When liquid and gas enter through the liquid inlet and gas inlet respectively, they impact the surface of the guide vanes in an axial or near-axial flow direction. The forced constraint of the guide vanes alters their flow direction, generating a circumferential shear velocity around the axis, thus forming a helical propulsion swirling motion. The leading and trailing edges of the guide vanes are streamlined to reduce resistance when the fluid contacts them. The axial length and torsion angle along the flow direction of the guide vanes can be designed according to the design flow rate and gas content. A larger torsion angle results in a higher swirling number and a larger initial contact area between the gas and liquid. Compared to bladeless devices that rely solely on the momentum exchange of the fluid to generate rotation, the guide vanes in this embodiment achieve the required swirling intensity with a significantly shorter axial length, thereby shortening the overall length of the device and making the overall structure more suitable for confined downhole spaces. Furthermore, the guide vanes, as fixed components, experience no wear and require no maintenance, improving reliability for long-term field operations.

[0035] To optimize the above technical solution, the swirl generation unit includes a first cavity 2, a liquid inlet and a gas inlet connected to the first cavity 2, and guide vanes disposed on the inner wall of the first cavity 2, with the guide vanes arranged close to the liquid inlet and the gas inlet.

[0036] Specifically, the first cavity 2 is the space inside the shell 1. Both the liquid inlet and the gas inlet are directly connected to the first cavity 2, and the guide vanes are installed on the downstream side of the first cavity 2 near the two liquid inlets and the gas inlet. When the high-pressure liquid flows into the first cavity 2 through the liquid inlet and the compressed gas flows into the gas inlet, the two fluids undergo initial spatial coupling in the first cavity. The flow velocity of the fluid here is temporarily reduced due to the increase in cross-sectional area relative to the inlet pipe, creating a buffer zone for momentum exchange and initial volume mixing between the gas and liquid, and avoiding uneven load caused by the inlet jet directly impacting the guide vanes.

[0037] Specifically, the guide vanes can be arranged adjacent to the liquid inlet and gas inlet on the outlet path of the first cavity 2, so that the mixed fluid entering the first cavity 2 immediately forms a rotating flow along the guide surface when flowing downstream. The inner wall of the first cavity 2 can be provided with a wear-resistant lining to prevent the rock powder particles in the rotating flow from eroding the wall surface, thereby improving its service life.

[0038] To optimize the above technical solution, the axial direction of the liquid inlet is parallel to the axial direction of the first cavity 2, and the axial direction of the gas inlet is perpendicular to the axial direction of the first cavity 2.

[0039] Specifically, the axial direction of the liquid inlet is parallel to the axial direction of the first cavity 2, forming axial liquid inlet; the axial direction of the gas inlet is perpendicular to the axial direction of the first cavity 2, forming radial gas inlet. When the liquid enters the first cavity 2 axially through the liquid inlet, the liquid has momentum along the main flow direction and flows directly to the guide vane area, ensuring the efficiency of liquid phase transport. At the same time, after the gas enters radially through the gas inlet, the gas jet penetrates the axial liquid flow vertically, forming cross-flow mixing. The gas and liquid phases undergo strong momentum exchange in the intersection area. The gas phase is sheared and carried by the liquid and changes its flow direction in a very short distance. It is wrapped and torn into gas clouds by the liquid flow and then enters the area where the guide vanes are set. This vertical orthogonal gas inlet method prolongs the residence time of the gas jet in the liquid, increases the velocity difference between the gas and liquid phases, and increases the shear rate. It can generate some fine bubbles before entering the spiral tube 4, reducing the gas phase load of the micropores 5 of the spiral tube 4. At the same time, the radial arrangement of the gas inlet also avoids the gas jet end from directly rushing into the first end of the spiral tube 4, further extending the service life of the device.

[0040] To optimize the above technical solution, the gas-liquid mixing disturbance sand removal device also includes a baffle 9, and the microbubble generating unit includes a second cavity 3. The baffle 9 is connected to the inner wall of the shell 1. One side of the baffle 9 and the inner wall of the shell 1 enclose a first cavity 2, and the other side of the baffle 9 and the inner wall of the shell 1 enclose a second cavity 3. The spiral tube 4 is arranged inside the second cavity 3. The baffle 9 has a through hole. The first end of the spiral tube 4 is connected to the through hole, and the second end of the spiral tube 4 extends along the axial direction of the second cavity 3.

[0041] Specifically, the partition 9 is used to clearly divide the interior of the shell 1 into a first cavity 2 and a second cavity 3, wherein the helical tube 4 of the microbubble generating unit is arranged in the second cavity 3. The partition 9 is a disc-shaped component made of metal or high-strength composite material, and its periphery is sealed and welded to the inner wall of the shell 1 or connected to a sealing ring by threads, so as to realize pressure isolation and flow channel separation between the first cavity 2 and the second cavity 3. A through hole is opened in the center of the partition 9, and the first end of the helical tube 4 is sealed to the through hole by welding, compression fitting or threaded joint, so as to ensure that the gas-liquid mixture in the first cavity 2 can enter the interior of the helical tube 4. The helical tube 4 extends spirally along the axial direction in the second cavity 3, and the second end of the helical tube 4 is open and faces the contraction section 6. After the gas-liquid mixture enters the helical tube 4, it undergoes forced spiral motion along the long distance of the helical tube 4. At different positions in the tube, part of the fluid is radially injected into the second cavity 3 through the micropores 5 on the wall of the helical tube 4, and the remaining part continues to advance forward and is finally discharged from the open end of the helical tube 4. In the second chamber 3, the microbubble clusters ejected from the micropores 5 undergo secondary mixing to form a unified microbubble dispersion, which then enters the contraction section 6. That is, the first chamber 2 is used for swirling generation and initial mixing, while the spiral tube 4 is arranged inside the second chamber 3. The second chamber 3 serves as a receiving and mixing chamber for the microbubble ejected from the micropores 5. Simultaneously, the second chamber 3 provides external protection for the spiral tube 4, preventing it from being directly affected by the vibration and impact transmitted from the drill rod 10, thus improving the overall durability of the gas-liquid mixing disturbance sand removal device.

[0042] To optimize the above technical solution, the contraction section 6 has a first large diameter end and a first small diameter end, with the first large diameter end arranged close to the second end of the spiral tube 4, and the first small diameter end connected to the first end of the throat 7; the throat 7 is a straight pipe section, and the ratio of the length of the straight pipe section to the inner diameter of the straight pipe section is greater than or equal to 3.

[0043] Specifically, the first large-diameter end of the contraction section 6 is positioned near the second end of the spiral tube 4, capable of completely receiving the mixed fluid discharged from the second end of the spiral tube 4 and the microbubble-containing fluid ejected from the micro-orifice 5 and diffused into the second cavity 3, and coaxially guiding both to the throat 7. The first large-diameter end is specifically sealed to the inner wall of the second cavity 3 to ensure that both the mixed fluid and the microbubble-containing fluid can enter the contraction section 6. The throat 7 is a straight pipe section with a constant inner diameter, the ratio of its length to its inner diameter being greater than or equal to 3, i.e., a length-to-diameter ratio of not less than 3:1. When the microbubble-containing mixed fluid accelerates through the contraction section 6 into the throat 7, it maintains a constant high-speed flow within the equal-diameter straight pipe section of the throat 7. The gas and liquid phases can be further homogenized here, making the size distribution of the microbubbles more uniform and eliminating the axial concentration gradient caused by the acceleration process. The second end of the throat 7 is connected to the diffuser section 8, which continues to convert kinetic energy into static pressure energy, ultimately discharging through the mixing outlet. Through actual use and data calculation, the above-mentioned aspect ratio enables the gas-liquid mixing disturbance sand removal device to maintain stable injection, while continuously forming a highly disturbed jet to achieve continuous sand removal, thereby improving the sand removal efficiency of directional drilling.

[0044] To optimize the above technical solution, the gas-liquid mixing disturbance sand removal device also includes a drill rod 10 and a drill bit 11. The diffuser section 8 has a second large diameter end and a second small diameter end, and the second large diameter end is connected to the second end of the throat 7, the second small diameter end is connected to the first end of the drill rod 10, and the drill bit 11 is connected to the second end of the drill rod 10.

[0045] Specifically, the second large-diameter end connects to the second end of the throat 7, receiving the high-speed mixed fluid accelerated by the throat 7. The second small-diameter end connects to the first end of the drill rod 10, and the second end of the drill rod 10 connects to the drill bit 11. The second small-diameter end is connected to the drill rod 10 via a tapered pipe thread or flange, ensuring high sealing performance and the ability to transmit torque and axial load. When the microbubble-containing liquid flows through the throat 7 and the diffuser section 8, it directly enters the internal channel of the drill rod 10, avoiding the problems of abrupt changes in the cross-sectional area of ​​the flow channel and increased friction resistance caused by connecting through intermediate components such as hoses and joints in traditional pipelines. This allows the pressure wave to be transmitted to the drill rod 10 within a very short distance. At the second end of the drill rod 10, the drill bit 11 has a water inlet or water eye that communicates with the inner hole of the drill rod 10. The high-speed microbubble mixed flow is jetted or diffused from the water inlet of the drill bit 11 towards the bottom of the borehole. Because drill bit 11 is close to the rock powder layer at the bottom of the hole, the distance from the generation of the jet to the impact target point is extremely short, resulting in less energy loss and concentrated disturbance force. This enables powerful flushing of the dead corners and low-side sedimentary zones at the bottom of the hole, thereby improving the sand removal efficiency of directional drilling.

[0046] To optimize the above technical solution, the diameter of the spiral tube 4 gradually decreases along the direction from the first end to the second end of the spiral tube 4; or, the diameter of the micropore 5 gradually decreases along the direction from the first end to the second end of the spiral tube 4.

[0047] Specifically, along the direction from the first end to the second end of the spiral tube 4, the diameter of the spiral tube 4 gradually decreases, that is, the diameter of the first end of the spiral tube 4 is larger, which can accept all the incoming flow from the first cavity 2, thereby reducing the inlet throttling resistance; the diameter gradually decreases along the path, which makes the mixing flow velocity in the spiral tube 4 gradually increase, so as to maintain the centrifugal force level of the fluid in the spiral tube 4, and make the pressure difference distribution inside and outside the microhole 5 relatively uniform throughout the entire tube from the first end to the second end of the spiral tube 4, thereby ensuring the uniform injection intensity of each section of the microhole 5 along the path.

[0048] Specifically, along the same direction, the diameter of the micropores 5 gradually decreases. That is, the first end of the spiral tube 4 has a high gas content and the generated bubbles are easy to coalesce. Using a larger aperture can increase the gas flow rate of a single hole, which is conducive to the formation of the initial bubble group. As the gas content decreases in the subsequent section, the demand for bubble refinement increases. The aperture is gradually reduced so that microbubbles can still be generated under low flow conditions, which improves the microbubble generation capacity near the second end of the spiral tube 4.

[0049] When a combined implementation scheme of tapered pipe diameter and tapered orifice diameter is adopted, that is, the pipe diameter of the spiral tube 4 gradually decreases along the direction from the first end to the second end of the spiral tube 4, and at the same time, the diameter of the micro-orifice 5 gradually decreases along the direction from the first end to the second end of the spiral tube 4. This can better enhance the size uniformity and spatial dispersion of the microbubble group throughout the spiral tube 4, maximize the crush resistance of the final jet and the coverage area of ​​the bottom disturbance, thereby further improving the slag removal efficiency of the directional orifice.

[0050] To optimize the above technical solution, the gas-liquid mixing disturbance sand removal device also includes an air compressor 12 and a high-pressure water pump 13. A first check valve 14 is provided between the air compressor 12 and the gas inlet, and a second check valve 15 is provided between the high-pressure water pump 13 and the liquid inlet.

[0051] Specifically, the air compressor 12 provides compressed air, and its output pipe is connected to the inlet of the first check valve 14. The outlet of the first check valve 14 is connected to the gas inlet of the gas-liquid mixing disturbance and sand removal device. The high-pressure water pump 13 provides high-pressure water or slurry, and its output pipe is connected to the inlet of the second check valve 15. The outlet of the second check valve 15 is connected to the liquid inlet of the gas-liquid mixing disturbance and sand removal device. The first check valve 14 and the second check valve 15 can be spring-return or gravity-operated check valves to ensure smooth fluid flow under rated operating conditions.

[0052] When the gas-liquid mixing disturbance sand removal device is in operation, the air compressor 12 and the high-pressure water pump 13 start simultaneously. Gas overcomes the spring force of the first one-way valve 14 and enters the first chamber 2, while liquid overcomes the spring force of the second one-way valve 15 and enters the first chamber 2. If the air compressor 12 unexpectedly stops or the air pressure suddenly drops, the first one-way valve 14 at the gas inlet can be closed under the pressure of the downstream liquid, preventing liquid from flowing back into the air compressor 12. Similarly, when the high-pressure water pump 13 stops or the liquid circuit is blocked, causing the pressure at the liquid inlet to drop below the gas pressure, the second one-way valve 15 automatically closes, preventing compressed air from flowing back into the high-pressure water pump 13. When the gas-liquid mixing disturbance sand removal device stops, the air compressor 12 can be turned off first, and the high-pressure water pump 13 can continue to supply water for 30-60 seconds to clear the pipeline and avoid blockage.

[0053] By arranging the first check valve 14 and the second check valve 15, the gas-liquid mixing disturbance sand removal device can still operate safely and reliably in the field construction environment with frequent start-stop and pressure changes, which extends the service life of the air compressor 12 and the high-pressure water pump 13, while reducing the maintenance frequency and operating cost of the device.

[0054] It should be noted that the gas-liquid mixing disturbance sand removal device provided by this invention can be used in the field of borehole sand removal equipment technology or other fields. Other fields refer to any field other than the field of borehole sand removal equipment technology. The above are merely examples and do not limit the application areas of the gas-liquid mixing disturbance sand removal device provided by this invention.

[0055] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0056] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0057] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A gas-liquid mixing disturbance sand removal device, characterized in that, include: A housing having a liquid inlet, a gas inlet, and a mixing outlet; A swirl generating unit disposed inside the housing is configured to receive liquid and gas entering through the liquid inlet and the gas inlet, and to form a swirling gas-liquid mixture of the liquid and gas. A microbubble generating unit is disposed inside the housing and downstream of the swirl generating unit. The microbubble generating unit includes a helical tube. The first end of the helical tube is connected to the swirl generating unit and is used to receive the gas-liquid mixture. The tube wall of the helical tube has multiple micropores. A pressurizing unit is disposed inside the housing, between the microbubble generating unit and the mixing outlet. The pressurizing unit has a constriction section, a throat, and a diffusion section connected in sequence. The constriction section is arranged near the second end of the spiral tube, and the diffusion section is connected to the mixing outlet.

2. The gas-liquid mixing disturbance sand removal device according to claim 1, characterized in that, At least one of the transition portion between the contraction segment and the throat, or the transition portion between the throat and the diffusion segment, is configured as an arcuate surface.

3. The gas-liquid mixing disturbance sand removal device according to claim 1, characterized in that, The swirl generating unit includes at least one set of inclined guide vanes fixed to the inner wall of the housing, and the guide surface of the guide vanes has an inclined angle with the axis of the housing.

4. The gas-liquid mixing disturbance sand removal device according to claim 3, characterized in that, The swirl generation unit includes a first cavity, the liquid inlet and the gas inlet are connected to the first cavity, the guide vanes are disposed on the inner wall of the first cavity, and the guide vanes are arranged close to the liquid inlet and the gas inlet.

5. The gas-liquid mixing disturbance sand removal device according to claim 4, characterized in that, The axial direction of the liquid inlet is parallel to the axial direction of the first cavity, and the axial direction of the gas inlet is perpendicular to the axial direction of the first cavity.

6. The gas-liquid mixing disturbance sand removal device according to claim 4, characterized in that, It also includes a partition. The microbubble generating unit includes a second cavity. The partition is connected to the inner wall of the shell. One side of the partition and the inner wall of the shell enclose the first cavity, and the other side of the partition and the inner wall of the shell enclose the second cavity. The spiral tube is arranged inside the second cavity. The partition has a through hole. The first end of the spiral tube is connected to the through hole, and the second end of the spiral tube extends along the axial direction of the second cavity.

7. The gas-liquid mixing disturbance sand removal device according to claim 6, characterized in that, The constriction section has a first large-diameter end and a first small-diameter end, with the first large-diameter end arranged close to the second end of the spiral tube, and the first small-diameter end connected to the first end of the throat. The throat is a straight pipe section, and the ratio of the length of the straight pipe section to its inner diameter is greater than or equal to 3.

8. The gas-liquid mixing disturbance sand removal device according to claim 6, characterized in that, It also includes a drill pipe and a drill bit, wherein the diffuser section has a second large diameter end and a second small diameter end, and the second large diameter end is connected to the second end of the throat, the second small diameter end is connected to the first end of the drill pipe, and the drill bit is connected to the second end of the drill pipe.

9. The gas-liquid mixing disturbance sand removal device according to claim 6, characterized in that, Along the direction from the first end to the second end of the spiral tube, the diameter of the spiral tube gradually decreases; Alternatively, the diameter of the micropores gradually decreases along the direction from the first end to the second end of the spiral tube.

10. The gas-liquid mixing disturbance sand removal device according to any one of claims 1 to 9, characterized in that, It also includes an air compressor and a high-pressure water pump, wherein a first check valve is provided between the air compressor and the gas inlet, and a second check valve is provided between the high-pressure water pump and the liquid inlet.

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