Production pipe column with bundling channel and anti-skid degassing lifting discharging and extracting method thereof

Abstract

The invention relates to the technical field of oil and gas exploitation, and discloses a production pipe column with a bundling channel and an anti-skid degassing lifting discharging and exploitation method.The production pipe column comprises an oil pipe, the oil pipe is provided with a plurality of first connectors at intervals in the axial direction, and the first bundling channel is connected with the oil pipe through screw threads at the upper end and the lower end; a mounting table, a clamp spring and a clamp spring groove are arranged to fix the bundling channel block; the cluster channel block is internally provided with a plurality of annular channel layers and is composed of a first channel and a second channel, and the center of the cluster channel block is provided with a sound wave generation cavity and a vibration sheet; a pin is arranged at the bottom of the oil pipe, and a screen pipe is arranged in the oil pipe and provided with a longitudinal slit; the upper end of the oil pipe is connected with a first pipeline and provided with a first oil pipe valve, and the upper end of the shaft is provided with a second pipeline and a second oil pipe valve. According to the invention, the purposes of anti-slip degassing lifting, discharging and mining are achieved with less gas amount or lower gas pressure.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and more specifically, to a production tubing with a cluster channel and its anti-slip gas extraction and extraction method. Background Technology

[0002] In the process of oil and gas well production, whether it is self-flowing or gas lift, gas is used to lift the fluid deep inside the wellbore to the surface. This is also called gas lift. Gas lift includes gas lift in the well itself, which is self-flowing or intermittently flowing production, or gas lift production by external gas source injection. During the gas lift process, liquid slippage usually occurs, especially in deep or ultra-deep wells. This phenomenon is particularly prominent, which can cause intermittent or stopped flow in oil and gas wells. This slippage phenomenon also increases the difficulty of gas lift production and reduces efficiency. Currently, measures such as velocity tubing (small-diameter tubing), bubble drainage, and high-pressure gas lift are commonly used to alleviate slippage, but they cannot fundamentally solve the problem of liquid slippage. Therefore, this problem has become a difficult issue that plagues oil and gas well production. Common sense tells us that during the process of gas carrying liquid upward, when the gas velocity is constant, the amount of liquid slippage is directly proportional to the diameter of the tubing. That is, the smaller the pipe diameter, the stronger the liquid-carrying capacity of the gas, and the smaller the slippage. Under the same pipe diameter, the higher the flow velocity, the less slippage. However, the smaller the pipe diameter, the greater the resistance, and the lower the production capacity and the higher the production cost.

[0003] Therefore, it is necessary to design a production column with a clustering channel and its anti-slip gas lift and extraction method to solve the problems existing in the current technology. Summary of the Invention

[0004] In view of this, the present invention proposes a production tubing with a cluster channel and its anti-slip gas extraction and extraction method, aiming to solve the problem that existing oil and gas extraction methods cannot simultaneously achieve anti-slip gas extraction and high production.

[0005] In one aspect, the present invention proposes a production tubing with a clustering channel, comprising an oil pipe, wherein a plurality of first joints are spaced apart along the axial direction, and the first joints are installed on the oil pipe by first and second threads provided at the upper and lower ends; a clustering channel block is installed on the first joint. The clustered channel block includes channels and a sound wave generating cavity; the sound wave generating cavity is provided with a vibrating plate; the clustered channel block is also provided with multiple annular channel layers, each channel layer consisting of several channels; The bottom of the tubing is a pipe foot, which is inserted into the well fluid; the bottom of the pipe foot is connected to a screen pipe; the bottom of the screen pipe is a guide cone; the screen pipe has several slits along its longitudinal direction. The tubing is fixed inside the wellbore, and the tubing and the wellbore are connected by pipelines.

[0006] Furthermore, the first connector is provided with a mounting platform, through which the cluster channel block is installed on the first connector and the first connector is fixed by a retaining spring; the first connector is provided with a retaining spring groove, which is used for the installation of the retaining spring; The cluster channel block is surrounded by several positioning posts; the cluster channel block is installed on the first connector by cooperating with the mounting platform through the positioning posts.

[0007] Furthermore, the cluster channel block can also be deployed.

[0008] Furthermore, a slot is provided inside the sound wave generating cavity, and the vibrating plate is connected to the slot so that the vibrating plate is installed inside the sound wave generating cavity.

[0009] Furthermore, the sound wave generating cavity also includes a whistle-like form.

[0010] Furthermore, the channel includes a first channel and a second channel, wherein the first channel is an arc-shaped channel and the second channel is a circular channel.

[0011] Furthermore, the second channel can be replaced by a flow guide ring; the flow guide ring includes a first hollow ring and a second hollow ring; the first hollow ring is disposed inside the second hollow ring, and the first hollow ring and the second hollow ring are connected by a plurality of blades; the blades are arranged at an angle or vertically.

[0012] Furthermore, the upper end of the tubing extends out of the wellbore; the pipeline includes a first pipeline and a second pipeline; the upper end of the tubing is equipped with the first pipeline, and a first tubing valve is installed on the first pipeline; the upper end of the wellbore is equipped with the second pipeline, and a second tubing valve is installed on the second pipeline.

[0013] Furthermore, the oil pipe is also provided with several second joints spaced apart along the axial direction; The second connector is formed by providing a first channel in the side wall of the first connector; the outer interface of the first channel is lower than the inner interface. The first channel can also be provided on the oil pipe.

[0014] Furthermore, the oil pipe is also provided with several U-shaped pipes spaced apart along the axial direction; The U-shaped tube is installed on the oil pipe through the third and fourth threads at the upper and lower ends; the U-shaped tube has a U-shaped channel inside; The sidewall of the U-shaped tube is provided with a second channel, and the outer interface of the second channel is lower than the inner interface; The second channel can also be provided on the oil pipe.

[0015] On the other hand, this application also provides a method for preventing slippage and gas lift and production of a production string with a cluster channel, which is applied to the above-mentioned production string with a cluster channel for well fluid production.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: The clustered channel block utilizes the anti-liquid slippage characteristics of small channels to bundle several small perforated or slit-like channels into a single block, i.e., the clustered channel block. This achieves the purpose of increasing the flow area and preventing liquid slippage. The production string formed by combining this clustered channel block with U-shaped tubes, perforated connectors, etc., not only takes into account the anti-liquid slippage characteristics of small channels, but also solves the problem of low production output with small pipe diameter while achieving a dual lift flow state of gas-carrying liquid lift and gas-driven liquid upward movement at a relatively low lift pressure. This achieves the purpose of anti-slippage gas lift discharge and extraction with a smaller gas volume or lower gas pressure or volume. The production string has no moving parts, is not easily damaged, is reliable in operation, has a long service life, requires no maintenance, and is simple to operate and apply. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of a production column with a clustering channel provided in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the first connector structure of a production column with a bundled channel provided in an embodiment of the present invention; Figure 3 A top view of a snap ring on a production column with a clustering channel provided in an embodiment of the present invention; Figure 4 A front view of a snap ring for a production column with a clustering channel provided in an embodiment of the present invention; Figure 5 A top view of a production column with a bundled channel provided in an embodiment of the present invention; Figure 6 This is a front view schematic diagram of the bundle channel block of a production column with a bundle channel provided in an embodiment of the present invention; Figure 7 This is a side view of the bundle channel block structure of a production column with a bundle channel provided in an embodiment of the present invention; Figure 8 A front view of a vibrating plate of a production column with a clustering channel provided in an embodiment of the present invention; Figure 9A top view of a vibrating plate of a production column with a clustering channel provided in an embodiment of the present invention; Figure 10 A side view of a vibrating plate of a production column with a clustering channel provided in an embodiment of the present invention; Figure 11 A schematic diagram of a screen tube structure for a production column with a bundled channel provided in an embodiment of the present invention; Figure 12 A schematic diagram of a flow guide ring structure for a production column with a bundle channel provided in an embodiment of the present invention; Figure 13 A top view of a flow guide ring for a production column with a clustering channel provided in an embodiment of the present invention; Figure 14 A schematic diagram of the structure of a production column with a clustering channel provided in an embodiment of the present invention. Figure 2 ; Figure 15 This is a schematic diagram of the second connector structure of a production column with a bundled channel provided in an embodiment of the present invention; Figure 16 A schematic diagram of the structure of a production column with a clustering channel provided in an embodiment of the present invention. Figure 3 ; Figure 17 A schematic diagram of a U-shaped tube structure with a clustering channel for a production column provided in an embodiment of the present invention. Figure 1 ; Figure 18 A schematic diagram of a U-shaped tube structure with a clustering channel for a production column provided in an embodiment of the present invention. Figure 2 .

[0018] The components include: 1. Tubing; 2. First connector; 201. First thread; 202. Second thread; 203. Mounting platform; 204. Bundled channel block; 2041. First channel; 2042. Second channel; 2043. Vibrating plate; 2044. Acoustic wave generating cavity; 2045. Positioning post; 2046. Slot; 205. Snap ring; 3. Tubing foot; 4. Well fluid; 5. Screen pipe; 501. Guide cone; 502. 6. Slit; 7. Wellbore; 8. First pipeline; 9. First tubing valve; 10. Second pipeline; 11. Second tubing valve; 12. Guide ring; 13. First hollow ring; 14. Second hollow ring; 15. Blade; 16. Second connector; 17. First channel; 18. U-shaped pipe; 19. Third thread; 10. Fourth thread; 11. U-shaped channel; 11. Second channel. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey its scope to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] In some embodiments of this application, see Figure 1-11 As shown, a production tubing with a clustering channel is proposed, including an oil pipe 1. The oil pipe 1 is provided with a plurality of first joints 2 at intervals along the axial direction. The first joints 2 are installed on the oil pipe 1 by first threads 201 and second threads 202 provided at the upper and lower ends. A clustering channel block 204 is installed on the first joints 2. The cluster channel block 204 includes a channel and a sound wave generating cavity 2044; the sound wave generating cavity 2044 is provided with a vibrating plate 2043; the cluster channel block 204 is also provided with multiple annular channel layers, each channel layer being composed of several channels. The bottom of tubing 1 is a pipe foot 3, which is inserted into well fluid 4; the bottom of pipe foot 3 is connected to screen pipe 5; the bottom of screen pipe 5 is a guide cone 501; screen pipe 5 has several slits 502 along the longitudinal direction of the pipe wall. The tubing 1 is fixed inside the wellbore 6, and the tubing 1 and the wellbore 6 are connected by pipelines.

[0021] In some embodiments of this application, a mounting platform 203 is provided on the first connector 2, the bundle channel block 204 is mounted on the first connector 2 by the mounting platform 203, and the first connector 2 is fixed by a retaining spring 205; a retaining spring 205 groove is provided on the first connector 2, the retaining spring 205 groove is used for the installation of the retaining spring 205; The cluster channel block 204 is provided with several positioning posts 2045 around its perimeter; the cluster channel block 204 is installed on the first connector 2 by cooperating with the mounting platform 203 through the positioning posts 2045.

[0022] In some embodiments of this application, the cluster channel block 204 may also be deployed.

[0023] In some embodiments of this application, a slot 2046 is provided in the sound wave generating cavity 2044, and the vibrating plate 2043 is connected to the slot 2046 so that the vibrating plate 2043 is installed in the sound wave generating cavity 2044.

[0024] In some embodiments of this application, the sound wave generating cavity 2044 also includes a whistle-like form.

[0025] In some embodiments of this application, the channel includes a first channel 2041 and a second channel 2042, wherein the first channel 2041 is an arc-shaped channel and the second channel 2042 is a circular channel.

[0026] In some embodiments of this application, the second channel 2042 may be replaced by a guide ring 9; the guide ring 9 includes a first hollow ring 901 and a second hollow ring 902; the first hollow ring 901 is disposed inside the second hollow ring 902, and the first hollow ring 901 and the second hollow ring 902 are connected by a plurality of blades 903; the blades 903 are arranged at an angle or vertically.

[0027] In some embodiments of this application, the upper end of the tubing 1 extends out of the wellbore 6; the pipeline includes a first pipeline 7 and a second pipeline 8; the upper end of the tubing 1 is equipped with the first pipeline 7, and a second tubing valve 701 is provided on the first pipeline 7; the upper end of the wellbore 6 is equipped with the second pipeline 8, and a second tubing valve 801 is provided on the second pipeline 8.

[0028] Specifically, a production tubing string with a clustered channel is installed inside the wellbore 6. The tubing 1, as the main structure, extends axially along the wellbore 6, and its lower end is provided with a foot 3 that is inserted into the well fluid 4 to introduce the well fluid 4. The bottom of the foot 3 is connected to a screen pipe 5, and the bottom of the screen pipe 5 is connected to a guide cone 501. The screen pipe 5 has several longitudinal slits 502 along its wall to perform primary filtration of the well fluid 4 entering the tubing 1 and prevent impurities from clogging it.

[0029] Specifically, a number of first connectors 2 are spaced apart along the axial direction of the tubing 1. Each first connector 2 is threaded to the tubing 1 through a first thread 201 and a second thread 202 at its upper and lower ends, thereby forming a modular tubing string structure. Alternatively, the first connectors 2 can be fixed inside the tubing in other ways. The first connectors 2 are provided with mounting platforms 203 and snap ring grooves. The bundled channel blocks 204 are mounted on the first connectors 2 through the mounting platforms 203 and are limited and fixed by snap rings 205 provided in the snap ring grooves to prevent displacement or detachment under the impact of downhole fluid.

[0030] Specifically, the cluster channel block 204 is the core fluid control structure of this application. It contains multiple annular channel layers and a sound wave generating cavity 2044 at its center, within which a vibrating plate 2043 is installed. In this embodiment, a slot 2046 is provided within the sound wave generating cavity 2044. The vibrating plate 2043 is stably installed by engaging with the slot 2046, generating vibration under pressure fluctuations and flow rate changes when fluid flows through it, thereby disturbing the fluid. Furthermore, the cluster channel block 204 has a channel structure, including a first channel 2041 and a second channel 2042. The first channel 2041 is an arc-shaped channel, corresponding to a slit-like channel structure, specifically a constriction-expansion nozzle or a slot structure; the second channel 2042 is a circular channel, corresponding to a perforated channel structure, specifically a constriction-expansion nozzle or a through-hole structure. The channel can be a single type of channel, such as annular, arc-shaped, or circular, or a combination of two or more of the above types. The channel can also be other irregularly shaped channels. Through this structural design, the fluid experiences an acceleration effect via a slotted constriction-expansion nozzle when passing through the first channel 2041, and its outlet velocity is further increased via a perforated constriction-expansion nozzle when passing through the second channel 2042, thereby forming a localized high-speed jet and shear flow field within the clustered channel block 204. Under the superposition of multiple annular channel layers, the fluid undergoes a multi-stage constriction-expansion acceleration process when passing through the clustered channel block 204, with the flow velocity increasing progressively. It also forms branching and re-merging between different channels, significantly enhancing the fluid's disturbance and carrying capacity. Simultaneously, the high-speed fluid impacts the vibrating plate 2043 within the sound wave generating cavity 2044, causing it to generate vibrational sound waves. These vibrational sound waves, emitted from the vibrating plate or whistle, further couple energy and modulate the state of the fluid, helping to disrupt the deposition structure in the well fluid 4 and reducing the risk of wax, scale, and particle deposition.

[0031] Specifically, regarding the surface control structure, the upper end of tubing 1 is connected to a first pipeline 7, which is equipped with a first tubing valve 701 to control the output of production fluid. The upper end of wellbore 6 is connected to a second pipeline 8, which is equipped with a second tubing valve 801. The second pipeline 8 is connected to the annulus of wellbore 6. When the gas flow or the gas supply in the well is insufficient, gas is injected into wellbore 6 by opening the second tubing valve 801, allowing the gas to enter the annulus of wellbore 6 and further participate in the gas lift process. This replenishes the gas source, reduces the fluid density in the tubing, and decreases the lift pressure differential, thereby improving gas lift efficiency and reducing start-up pressure.

[0032] In actual operation, when the first tubing valve 701 is opened, the well fluid 4 enters the tubing 1 through the pipe foot 3 and flows upward. When the fluid passes through the cluster channel joint area, it enters the cluster channel block 204, where it undergoes multi-stage acceleration under the combined action of the arc-shaped slit-like expansion nozzle and the circular orifice-shaped expansion nozzle, forming a complex turbulent flow field. Simultaneously, the fluid impacts the vibrating plate 2043, generating vibration waves that further turbulent and activate the fluid. When there is insufficient gas in the well, the second tubing valve 801 is opened, and gas is injected into the wellbore 6 through the second pipeline 8, allowing the gas to enter the annulus and participate in gas lift, thereby achieving efficient lifting under low gas volume and low gas pressure conditions.

[0033] Understandably, the multi-channel cluster structure not only ensures anti-slip capability but also improves flow capacity. Furthermore, the combination design of the converging and expanding nozzles and the converging and expanding orifice significantly increases fluid velocity. Combined with the external gas injection system, it enables flexible adjustment of the gas lift operation, thereby improving the lifting efficiency and adaptability of the production tubing.

[0034] In some embodiments of this application, see Figure 12-13 As shown, the oil pipe 1 is also provided with several second joints 10 at intervals along the axial direction; The second connector 10 is formed by providing a first channel 1001 on the side wall of the first connector 2; the outer interface of the first channel 1001 is lower than the inner interface. The first channel 1001 can also be set on the oil pipe 1.

[0035] Specifically, to further optimize the fluid flow state inside the cluster channel block 204, the second channel 2042 can be replaced by a guide ring 9 structure. The guide ring 9 is an overall annular component, and its installation position can be set in the area inside the cluster channel block 204 corresponding to the second channel 2042.

[0036] Specifically, the guide ring 9 includes a first hollow ring 901 and a second hollow ring 902. The first hollow ring 901 is disposed inside the second hollow ring 902, and the two are coaxially arranged to form an annular fluid channel structure. The first hollow ring 901 and the second hollow ring 902 are connected by a number of blades 903. The blades 903 are evenly distributed circumferentially and set at a certain angle relative to the axial direction of the fluid, thus forming a flow channel similar to a guide impeller or a vortex generator in structure.

[0037] Specifically, in terms of installation, the guide ring 9 can be fixed inside the bundle channel connector via snap-fit, threaded connection, or a limiting structure, allowing it to maintain a stable position under fluid action or achieve positioning through the limiting structure. This structure is suitable for gas production tubing systems in natural gas wells, shale gas wells, and coalbed methane wells.

[0038] In actual operation, when the gas-liquid mixture in the wellbore 6 flows upward along the production tubing and passes through the guide ring 9, the fluid is forced to change its flow direction under the guidance of the blade 903, forming a significant rotational flow. That is, while moving upward axially, a circumferential rotational component is superimposed, thus forming a stable vortex flow field inside the guide ring 9 and its downstream region. Since the annular flow channel formed between the first hollow ring 901 and the second hollow ring 902 is relatively narrow, the fluid velocity increases further when passing through this region. At the same time, centrifugal force is generated under the rotational action, making the liquid more easily distributed to the outside relative to the gas and forming a local stagnation or confined state.

[0039] Understandably, through the aforementioned structural effects, the swirling flow enhances the interaction between the gas and liquid phases, increasing the gas's ability to carry the liquid. Due to the smaller channel size and the fluid's swirling state, the tendency for the liquid to fall back under gravity is suppressed, thus reducing gas-liquid slippage. The vortex flow can also disrupt the continuous liquid phase structure to some extent, causing the liquid to be dispersed and carried upwards by the gas. By replacing the traditional second channel 2042 structure with the guide ring 9, a swirling enhancement zone can be constructed inside the production string without increasing energy consumption. This achieves active control of the gas-liquid two-phase flow state, enhancing gas-liquid carrying capacity, suppressing liquid backflow, and improving drainage and gas production efficiency.

[0040] In some embodiments of this application, see Figure 14-15 As shown, the oil pipe 1 is also provided with several U-shaped pipes 11 arranged at intervals along the axial direction; The U-shaped tube 11 is installed on the oil pipe 1 through the third thread 1101 and the fourth thread 1102 provided at the upper and lower ends; the U-shaped tube 11 is provided with a U-shaped channel 1103 inside; The side wall of the U-shaped tube 11 is provided with a second channel 1104, and the outer interface of the second channel 1104 is lower than the inner interface. The second channel 1104 can also be installed on the oil pipe 1.

[0041] Specifically, in addition to a number of first joints 2 spaced apart along the axial direction, the oil pipe 1 is further spaced apart along the axial direction by a number of second joints 10. The second joints 10 can be arranged alternately with the first joints 2 or combined at a preset interval to form a multi-stage fluid control structure. The second joints 10 can be structurally improved based on the first joints 2, that is, by opening a first channel 1001 on the side wall of the first joint 2, a second joint 10 with gas introduction function is formed.

[0042] Specifically, the first channel 1001 is a channel that connects the inner and outer spaces of the bundled channel joint. One end of it is connected to the internal fluid channel of the tubing 1, and the other end is connected to the annulus of the wellbore 6, which is used to introduce annular gas into the tubing 1. The first channel 1001 is arranged at an angle in space, with its outer interface (i.e., the end located on the outer wall of the joint and connected to the annulus of the wellbore 6) lower than its inner interface (i.e., the end located on the inner wall of the joint and connected to the inside of the tubing 1), thus forming a channel structure that gradually rises from the outside to the inside.

[0043] In actual operation, when gas is present in the annulus of wellbore 6, under the pressure difference between the inside and outside of wellbore 6, the gas can enter through the outer interface of the first channel 1001 and flow upwards into the tubing 1 along the inclined direction. Since the outer interface is lower than the inner interface, gravity effectively inhibits the backflow of liquid inside tubing 1 through this channel, thus structurally forming a gas introduction channel with unidirectional flow characteristics. This "low outer, high inner" channel arrangement not only facilitates the smooth entry of gas into tubing 1 but also prevents well fluid 4 from leaking into the annulus of wellbore 6 through the channel, improving the stability and safety of the system operation. After the gas enters the tubing 1 through the first channel 1001, it forms a gas-liquid two-phase mixture with the upward-flowing well fluid 4, thereby reducing the overall fluid density inside tubing 1, decreasing the static pressure of the fluid column, and improving the gas's ability to lift the liquid. Meanwhile, multiple second connectors 10 are arranged at intervals along the axial direction, so that gas can enter the oil pipe 1 at different depths in stages, thereby forming a multi-point gas injection effect and avoiding the problems of low gas utilization or local flow instability caused by single-point gas injection.

[0044] Understandably, the second connector 10 works in synergy with the first connector 2: the first connector 2 achieves fluid disturbance, acceleration, and anti-slip effects through the internal cluster channel block 204, while the second connector 10 achieves gas replenishment and density regulation through the first channel 1001, thus forming a composite flow control system of "multi-stage disturbance + segmented gas injection" within the entire production tubing. While ensuring that liquid backflow is not easily prevented, this achieves efficient introduction of annular gas into the tubing 1, reduces the pressure required for gas lift, improves gas utilization efficiency, and enhances the stability of the gas-liquid two-phase flow, thereby improving the gas lift drainage and gas production effects.

[0045] In some embodiments of this application, see Figure 16-18 As shown, the oil pipe 1 is also provided with several U-shaped pipes 11 arranged at intervals along the axial direction.

[0046] In some embodiments of this application, the U-shaped tube 11 is installed on the oil pipe 1 by the third thread 1101 and the fourth thread 1102 provided at the upper and lower ends; the U-shaped tube 11 is provided with a U-shaped channel 1103 inside.

[0047] In some embodiments of this application, the sidewall of the U-shaped tube 11 is provided with a second channel 1104, and the outer interface of the second channel 1104 is lower than the inner interface.

[0048] Specifically, in addition to the first connector 2 and the second connector 10, the tubing 1 is also provided with several U-shaped tubes 11 at intervals along the axial direction. The U-shaped tubes 11 can be arranged on the tubing 1 string at predetermined intervals according to the well depth, the properties of the well fluid 4 and the gas lift conditions, and can be alternated or combined with the bundle channel connector, thereby forming a multi-level fluid control structure inside the production tubing string.

[0049] Specifically, the U-shaped tube 11 is threadedly connected to the oil pipe 1 through the third thread 1101 and the fourth thread 1102 respectively provided at its upper and lower ends, so that the U-shaped tube 11 can be installed in the oil pipe 1 column as an independent functional section, and is easy to disassemble, replace and combine. The U-shaped tube 11 is provided with a U-shaped channel 1103 inside. The U-shaped channel 1103 has a "forward upward - reverse downward - upward again" zigzag flow channel structure. That is, when the fluid passes through this structure, it must go through the upward section, the turning section and the upward section in sequence, thus forming a zigzag flow path.

[0050] In actual operation, after the gas-liquid two-phase fluid enters the U-shaped tube 11, the channel direction changes, forming a local stagnation zone and a gas accumulation zone in the turning area. This results in the formation of a gas section and a liquid section with certain closed characteristics within the U-shaped channel 1103. This structure can construct multiple flow units with alternating "gas section-liquid section" distribution inside the tube column, transforming the upward fluid from a continuous flow state to a segmented propulsion state. Under the action of gas expansion and pressure, a propulsive effect is formed on the liquid, similar to a piston lifting mechanism.

[0051] Specifically, the sidewall of the U-shaped tube 11 is further provided with a second channel 1104. The second channel 1104 penetrates the interior of the U-shaped channel 1103 and is annular with the wellbore 6. Its outer interface is located on the outer wall of the U-shaped tube 11 and connects to the annular hole of the wellbore 6, while its inner interface is located inside the U-shaped channel 1103. The second channel 1104 also adopts an inclined structure with the outer interface lower than the inner interface in its spatial arrangement, thus forming a channel path that gradually rises from the outside to the inside. When gas is present in the annular hole of the wellbore 6, the gas can enter the interior of the U-shaped channel 1103 through the second channel 1104 under the action of pressure difference and preferentially accumulate in the higher region of the U-shaped channel 1103, thereby enhancing the formation effect of the gas section. Simultaneously, because the outer interface of the second channel 1104 is lower than the inner interface, under the action of gravity, it can effectively prevent the liquid in the U-shaped channel 1103 from flowing back out through this channel, thereby achieving unidirectional flow characteristics and ensuring the stability and reliability of gas introduction.

[0052] During actual operation, when the well fluid 4 enters the tubing 1 through the foot 3 and flows upward, the fluid passes through multiple U-shaped tubes 11 in sequence, forming an independent gas-liquid segment unit within each U-shaped tube 11. Simultaneously, annular gas is continuously replenished into each U-shaped channel 1103 through the second channel 1104, ensuring the gas segment is maintained or enhanced. This creates a multi-stage, series-connected segmented lifting system within the entire tubing 1 string, allowing the gas to not only carry the liquid upward via traditional gas lift but also drive the liquid through segmented propulsion, thereby significantly improving gas utilization efficiency.

[0053] Understandably, the U-shaped tube 11 not only suppresses the liquid's fall under gravity and reduces gas-liquid slippage, but also enables stable lifting of the well fluid 4 under low gas volume or low gas pressure conditions. Combined with the multi-point gas supply effect achieved by the second channel 1104, it further reduces the overall gas lift pressure requirement, improves adaptability in low-production gas wells or high-liquid-load wells, and thus enhances the gas lift drainage and gas production effect.

[0054] Based on another preferred embodiment of the above embodiments, this embodiment provides a method for preventing slippage and gas lift-up and production of a production string with a cluster channel, which is applied to the above-mentioned production string with a cluster channel for well fluid production.

[0055] In summary, the clustered channel block utilizes the anti-liquid slippage characteristic of small channels by bundling several small perforated or slit-like channels into a single block, thus increasing the flow area and preventing liquid slippage. Combining this clustered channel block with U-shaped tubes and perforated connectors to form a production string not only maintains the anti-liquid slippage characteristics of small channels but also solves the problem of low production volume with small pipe diameter while achieving a dual-lift flow pattern of gas-carrying liquid lifting and gas-driven liquid upward movement at a relatively low lift pressure. This allows for anti-slip gas lift extraction and treatment with a smaller gas volume or pressure. The production string has no moving parts, is not easily damaged, is reliable, has a long service life, requires no maintenance, and is simple to operate.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A production tubing string with a clustering channel, comprising tubing, characterized in that, The oil pipe is provided with a plurality of first joints at intervals along the axial direction. The first joints are installed on the oil pipe by first and second threads provided at the upper and lower ends. A clustering channel block is installed on the first joint. The clustered channel block includes channels and a sound wave generating cavity; the sound wave generating cavity is provided with a vibrating plate; the clustered channel block is also provided with multiple annular channel layers, each channel layer consisting of several channels; The bottom of the tubing is a pipe foot, which is inserted into the well fluid; the bottom of the pipe foot is connected to a screen pipe; the bottom of the screen pipe is a guide cone; the screen pipe has several slits along its longitudinal direction. The tubing is fixed inside the wellbore, and the tubing and the wellbore are connected by pipelines.

2. The production tubular column with a clustering channel according to claim 1, characterized in that, The first connector is provided with a mounting platform, through which the cluster channel block is installed on the first connector and the first connector is fixed by a retaining spring; the first connector is provided with a retaining spring groove, which is used for the installation of the retaining spring; The cluster channel block is surrounded by several positioning posts; the cluster channel block is installed on the first connector by cooperating with the mounting platform through the positioning posts.

3. The production tubular column with a clustering channel according to claim 2, characterized in that, The cluster channel block can also be deployed.

4. The production tubular column with a clustering channel according to claim 1, characterized in that, The sound wave generating cavity is provided with a slot, and the vibrating plate is connected to the slot so that the vibrating plate is installed in the sound wave generating cavity.

5. The production tubular column with a clustering channel according to claim 4, characterized in that, The sound wave generating cavity also includes a whistle-like form.

6. The production tubular column with a clustering channel according to claim 1, characterized in that, The channel includes a first channel and a second channel, wherein the first channel is an arc-shaped channel and the second channel is a circular channel.

7. The production tubular column with a clustering channel according to claim 6, characterized in that, The second channel can be replaced by a flow guide ring; the flow guide ring includes a first hollow ring and a second hollow ring; the first hollow ring is disposed inside the second hollow ring, and the first hollow ring and the second hollow ring are connected by a plurality of blades; the blades are arranged at an angle or vertically.

8. The production tubular column with a clustering channel according to claim 1, characterized in that, The upper end of the tubing extends out of the wellbore; the pipeline includes a first pipeline and a second pipeline; the upper end of the tubing is equipped with the first pipeline, and a first tubing valve is installed on the first pipeline; the upper end of the wellbore is equipped with the second pipeline, and a second tubing valve is installed on the second pipeline.

9. The production tubular column with a clustering channel according to claim 1, characterized in that, The oil pipe is also provided with several second joints at intervals along the axial direction. The second connector is formed by providing a first channel in the side wall of the first connector; the outer interface of the first channel is lower than the inner interface. The first channel can also be provided on the oil pipe.

10. The production tubular column with a clustering channel according to claim 9, characterized in that, The oil pipe is also provided with several U-shaped pipes spaced apart along the axial direction; The U-shaped tube is installed on the oil pipe through the third and fourth threads at the upper and lower ends; the U-shaped tube has a U-shaped channel inside; The sidewall of the U-shaped tube is provided with a second channel, and the outer interface of the second channel is lower than the inner interface; The second channel can also be provided on the oil pipe.

11. A method for preventing slippage and gas lift extraction of a production tubing with a cluster channel, characterized in that, Applied to well fluid production using a production string with a clustered channel as described in any one of claims 1-10.

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