Gravel filling screen pipe with bypass pipeline
By designing adaptive diversion pipe and bypass pipe structures in the gravel-filled screen pipe, the problems of complex assembly, unstable connection and insufficient pipe diameter in the prior art are solved, and more efficient gravel filling and heavy oil adaptation are achieved Ability to thermal harvesting operations.
Patent Information
- Application Number
- CN202311004895.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-10
- Publication Date
- 2025-02-18
AI Technical Summary
The existing filling screen technology with bypass pipelines is complicated in the assembly and disassembly process, with low connection stability and reliability, and small pipe diameter, making it difficult to adapt to steam injection operations of heavy oil hot production horizontal wells. .
A gravel-filled screen tube with bypass pipeline is designed, including the base tube, the flow guide and the bypass pipe. By setting back holes and filter tubes on the outer wall of the base tube, and the flow guide and the bypass pipe are Steps and fixing rings are provided on the pipe to improve connection stability and simplify the installation and disassembly process.
It improves the scope of use of screen pipes, enhances connection stability, simplifies installation and disassembly steps, and adapts to the steam injection operation requirements of heavy oil hot production level wells.
Smart Images
Figure CN119466675A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a gravel filling screen pipe with a bypass pipeline, belonging to the technical field of underground gravel filling operations. Background Art
[0002] During the open-hole gravel packing operation in horizontal wells, the downhole sand-carrying fluid will be transported in the annulus outside the screen pipe of the horizontal well section. As the desanding process continues, the gravel in the sand-carrying fluid will gradually settle and accumulate, resulting in the gradual growth of the filling balance embankment. At the same time, at different well depths in the annulus, the parameters such as the sand-carrying fluid flow rate, sand-carrying concentration, and wellbore filtration rate are different, which can easily lead to a rapid growth of the local balance embankment, forming a sand bridge, and blocking the subsequent sand-carrying fluid from continuing to move forward. In addition, before the filling operation, due to the long-term immersion of the horizontal well section in the well fluid, it is very easy to cause multiple points of the well wall to collapse, forming one or more sand bridges in the annulus outside the screen pipe, blocking the main circulation channel of the sand-carrying fluid. The sand bridge will cause the gravel filling operation to be terminated prematurely, leaving a filling deficit area in the local annulus, and incomplete gravel filling.
[0003] In order to solve the above problems, experts and scholars at home and abroad have proposed a filling screen technology with a bypass pipeline. This technology is usually combined with the top filling process. Its working principle is: a bypass pipeline is laid on the outside of the screen base pipe. Once the annulus forms a bridge, the sand-carrying liquid can enter the bypass pipeline and continue to be transported to the lower part across the sand bridge. A nozzle is arranged at intervals on the bypass pipeline to fill the nearby annulus. This technology can not only eliminate the filling deficit area, but also eliminate the local small gaps left over from the main filling process, and finally form a continuous gravel filling belt that is both solid and full, greatly improving the filling effect and significantly extending the effective period of sand control; it is particularly suitable for operating conditions with a large continuous filling length (more than 300 meters).
[0004] However, the structure of the screen string of the existing bypass pipe filling screen technology is relatively complex, and the assembly and disassembly steps are cumbersome, and the stability and reliability of its connection are also low. In addition, the diameter of the existing bypass pipe filling screen is small. Therefore, when steam injection is performed on the heavy oil thermal recovery horizontal well in the later stage, the large double-layer insulation oil pipe is difficult to be lowered into the oil well. These problems limit the application of the filling screen technology. Summary of the invention
[0005] In view of the above technical problems, the present invention aims to provide a gravel packing screen with a bypass pipeline. The gravel packing screen with a bypass pipeline of the present invention can improve the use range of the screen, and at the same time has better connection stability and simpler installation and disassembly steps.
[0006] According to the present invention, a gravel packing screen with a bypass pipeline is provided, comprising a base pipe arranged in an oil well, wherein a return channel for fluid circulation is defined in the base pipe, and return holes connecting the return channel and an external space of the base pipe are evenly arranged on the outer wall of the base pipe; a guide pipe and a bypass pipe are evenly arranged on the outer wall of the base pipe along the circumferential direction, and the guide pipe and the bypass pipe are both constructed in a circular arc shape adapted to the outer wall of the base pipe and extend along the outer wall of the base pipe, so that the guide pipe and the bypass pipe can be sleeved on the outer wall of the base pipe, and the guide channel is arranged in the guide pipe and the bypass pipe, so that downhole fluid can move in the guide pipe and the bypass pipe along the axial direction of the base pipe, and a plurality of first bypass holes connecting the guide channel are evenly arranged in the axial direction on the outer wall of the bypass pipe away from the base pipe, so that the fluid in the bypass pipe can be discharged into the oil well.
[0007] An annular channel is formed radially between the base pipe and the flow guide pipe and the bypass pipe. A filter pipe for blocking the passage of gravel is arranged in the annular channel. A gap is arranged between the circumferential parts of any two adjacent flow guide pipes and bypass pipes, so that the downhole fluid outside the base pipe can flow from the gap through the filter pipe and the return hole to the return channel.
[0008] In a preferred embodiment, step portions are respectively provided on the outer walls of the base pipe at both axial ends of the flow guide pipe and the bypass pipe, and the flow guide pipe and the bypass pipe are configured to abut against the step portions to limit the axial movement of the flow guide pipe and the bypass pipe.
[0009] An extension portion extending in the axial direction is arranged on the outer wall of the flow guide pipe and the bypass pipe at a side away from the base pipe, and the extension portion can pass through the step portion along the outer wall of the step portion.
[0010] In a preferred embodiment, an upper fixing ring and a lower fixing ring are sleeved on the outer walls of the step portions on the upper and lower sides of the guide tube, and a plurality of fan-shaped holes matching the extension portion and allowing the extension portion to pass through are evenly arranged on the inner walls of the upper fixing ring and the lower fixing ring along the circumferential direction.
[0011] The upper fixing ring and the lower fixing ring are fixedly connected to the step portion so as to limit the extension portion from rotating along the circumferential direction of the base pipe.
[0012] In a preferred embodiment, a connecting pipe joint is sleeved on the step portions of the upper end of the upper fixing ring and the lower end of the lower fixing ring, and baffles and second bypass holes are evenly arranged on the outer wall of the connecting pipe joint along the circumferential direction.
[0013] The connecting pipe joint forms a sliding fit with the upper fixing ring, the lower fixing ring and the step portion respectively, so that the connecting pipe joint can rotate relative to the base pipe, thereby making the second bypass hole in a first relative position corresponding to the flow guide pipe and a second relative position corresponding to the bypass pipe.
[0014] In a preferred embodiment, sealing members are respectively provided at the connection parts between the connecting pipe joint and the step part, the upper fixing ring and the lower fixing ring.
[0015] In a preferred embodiment, an annular retaining ring is respectively provided on one end of the connecting pipe joint away from the guide pipe, and the retaining ring is arranged to be fixedly connected to the outer wall of the step portion and abut against the connecting pipe joint, thereby limiting the axial movement of the connecting pipe joint.
[0016] In a preferred embodiment, protective sleeves are respectively provided on the first bypass hole and the second bypass hole, and the protective sleeves are made of rubber material.
[0017] In a preferred embodiment, the filter tube is arranged in the gap, so that the filter tube is arranged between the guide tube and the bypass tube in the circumferential direction, and the guide tube, the bypass tube and the filter tube are arranged to be closely attached to the outer wall of the base tube.
[0018] In a preferred embodiment, a protective tube is sleeved on the outer side of the flow guide pipe, and through holes corresponding to the return hole and the first bypass hole are arranged on the outer wall of the protective tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be described below with reference to the accompanying drawings.
[0020] Figure 1 A schematic diagram of a gravel pack screen with a bypass line according to an embodiment of the present invention is shown.
[0021] Figure 2 for Figure 1 A schematic diagram of a flow tube of a gravel-pack screen with a bypass pipe is shown.
[0022] Figure 3 for Figure 1 A schematic diagram of a bypass pipe of a gravel pack screen with a bypass pipe is shown.
[0023] Figure 4 for Figure 1 Schematic diagram of the upper fixing ring structure of the gravel pack screen with a bypass pipeline is shown.
[0024] Figure 5 for Figure 1A schematic diagram of another embodiment of a lower retaining ring of a gravel pack screen with a bypass line is shown.
[0025] Figure 6 for Figure 1 Schematic diagram of a connecting pipe joint of a gravel pack screen with a bypass pipe is shown.
[0026] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION
[0027] The present invention will be described below with reference to the accompanying drawings.
[0028] Figure 1 FIG. 1 is a schematic diagram of a gravel pack screen 100 with a bypass line according to an embodiment of the present invention. Figure 1 As shown, the gravel packing screen 100 with bypass pipeline comprises a base pipe 10 disposed in an oil well, wherein a flowback channel 12 for fluid circulation is defined in the base pipe 10. At the same time, flowback holes 15 are evenly arranged on the outer wall of the base pipe 10, so that the flowback channel 12 is connected to the outer space of the base pipe 10, so that the downhole fluid in the outer space of the base pipe 10 can flow into the flowback channel 12 through the flowback holes 15, and then flow back to the wellhead along the flowback channel 12.
[0029] like Figure 1 As shown, a plurality of flow guide pipes 20 and bypass pipes 30 are respectively disposed on the outer wall of the base pipe 10 .
[0030] Figure 2 and Figure 3 They are Figure 1 Schematic diagram of the guide pipe 20 and the bypass pipe 30 shown. Figure 2 and Figure 3 As shown, the flow guide pipe 20 and the bypass pipe 30 are both configured as arc shapes adapted to the outer wall of the base pipe 10 and extend along the outer wall of the base pipe 10. With this structure, the flow guide pipe 20 and the bypass pipe 30 can be sleeved on the outer wall of the base pipe 10.
[0031] The flow guiding channels 25 in the flow guiding pipe 20 and the bypass pipe 30 enable the downhole fluid to move in the flow guiding pipe 20 and the bypass pipe 30 along the axial direction of the base pipe 10 .
[0032] At the same time, a plurality of first bypass holes 35 are also provided on the outer wall of the end of the bypass pipe 30 away from the base pipe, and the plurality of first bypass holes 35 are evenly arranged along the axial direction of the bypass pipe 30. In this way, when the sand-containing fluid flows through the first bypass holes 35 along the axial direction, when a gap that needs to be filled appears in the formation or oil well outside the bypass pipe 30, the sand-containing fluid can flow to the formation through the first bypass holes 35 by itself, so that the formation or oil well can be filled with sand and gravel in the sand-containing fluid, thereby achieving the purpose of gravel packing.
[0033] like Figure 1 As shown, a gap 36 is provided between the base pipe 10, the flow guide pipe 20 and the circumferential member of the bypass pipe 30, so that the sand-containing fluid sprayed from the first bypass hole 35 outside the base pipe 10 and filled with sand can flow back from the gap 36 through the flowback hole 15 to the flowback channel 12, and then flow back to the wellhead through the flowback channel 12.
[0034] Necessarily, an annular channel 39 is formed radially between the base pipe 10, the flow guide pipe 20 and the bypass pipe 30. Meanwhile, a filter tube (not shown) is also arranged in the annular channel 39. The filter tube can prevent the sand and gravel in the sand-containing fluid from passing through the filter tube, thereby filtering the sand-containing fluid and preventing the filled sand and gravel from flowing back into the base pipe 10, causing filling failure.
[0035] Therefore, when filling the formation or oil well is required, the operator can connect multiple base pipes 10 in series, and then introduce sand-containing fluid into the flow pipe 20 and the bypass pipe 30 through the wellhead. At this time, the fluid will flow downward along the flow pipe 20 and the bypass pipe 30.
[0036] When the sand-containing fluid flows through the formation gap, part of the fluid will be ejected from the first bypass hole 35, thereby filling the formation. Then, the gravel in the sand-containing fluid will be blocked by the filter pipe in the formation outside the base pipe 10, and the fluid without sand will flow back to the wellhead through the base pipe 10, thereby filling the formation.
[0037] Subsequently, when the sand-containing fluid passes through the connection portion of two adjacent base pipes 10, part of the fluid in the flow guide pipe 20 will flow back into the bypass pipe 30 until the fluid pressures in the flow guide pipe 20 and the bypass pipe 30 are balanced, thereby replenishing the sand-containing fluid consumed in the bypass pipe 30 and ensuring smooth subsequent filling operations.
[0038] In a preferred embodiment, the filter tube is disposed in a gap 36 between the flow guide tube 20 and the bypass tube 30 in the circumferential direction, so that the filter tube is disposed between the flow guide tube 20 and the bypass tube 30 in the circumferential direction. With this arrangement, the operator can arrange the flow guide tube 20, the bypass tube 30 and the filter tube to be closely attached to the outer wall of the base pipe 10, thereby reducing the outer diameter of the base pipe 10.
[0039] As the outer diameter of the base pipe 10 decreases, the operator can obtain a larger inner diameter of the return channel 12 under the same oil well size condition. Therefore, when performing steam injection operation on the heavy oil thermal recovery horizontal well in the later stage, increasing the inner diameter of the return channel 12 is more conducive to the operator to run a larger double-layer insulated oil pipe into the return channel 12, thereby better meeting the equipment requirements for steam injection operation on the heavy oil thermal recovery horizontal well, and improving the scope of application of the present invention.
[0040] like Figure 1 As shown, step portions 40 are respectively provided on the outer wall of the base pipe 10 at both axial ends of the flow guide pipe 20 and the bypass pipe 30. Therefore, when the flow guide pipe 20 and the bypass pipe 30 are provided, they can abut against the step portions 40.
[0041] It is easy to understand that when the guide pipe 20 and the bypass pipe 30 are in abutment with the step portion 40, the step portion 40 can limit the axial movement of the guide pipe 20 and the bypass pipe 30, thereby fixing the guide pipe 20 and the bypass pipe 30, so that the guide pipe 20 and the bypass pipe 30 have better connection stability.
[0042] like Figure 2 and Figure 3 As shown, an extension portion 42 extending in the axial direction is provided on the outer wall of the flow guide pipe 20 and the bypass pipe 30 on the side away from the base pipe 10. The extension portion 42 can pass through the step portion 40 along the outer wall of the step portion 40, so that after the flow guide pipe 20 and the bypass pipe 30 abut against the step portion 40, the step portion 40 can be prevented from obstructing the flow of the fluid in the flow guide pipe 20 and the bypass pipe 30.
[0043] like Figure 1 As shown, an upper fixing ring 52 and a lower fixing ring 54 are respectively sleeved on the outer walls of the step portion 40 at the upper and lower sides of the guide tube 20 .
[0044] Figure 4 for Figure 1 The upper fixing ring 52 of the gravel packing screen 100 with a bypass pipeline is shown in FIG. Figure 4As shown, the upper fixing ring 52 is configured as a circular ring. A plurality of fan-shaped holes 45 adapted to the extension portion 42 are uniformly arranged along the circumferential direction on the inner wall of the upper fixing ring 52. Thus, the extension portion 42 can pass through the upper fixing ring 52 through the fan-shaped holes 45, so that the fluid in the guide pipe 20 and the bypass pipe 30 can pass through the upper fixing ring 52.
[0045] In the present invention, the upper fixing ring 52 is configured to be fixedly connected to the step portion 40. In this way, when the extension portion 42 passes through the fan-shaped hole 45, the upper fixing ring 52 can limit the rotation of the extension portion 42 along the circumferential direction of the base pipe 10, thereby limiting the rotation of the flow guide pipe 20 and the bypass pipe 30 along the circumferential direction of the base pipe 10. Therefore, the upper fixing ring 52 can fix the flow guide pipe 20 and the bypass pipe 30 in the circumferential direction, thereby improving the stability of the connection.
[0046] In summary, the step portion 40 and the upper fixing ring 52 can fix the flow guide pipe 20 and the bypass pipe 30 in the axial direction and the circumferential direction respectively, thereby improving the stability of the connection between the flow guide pipe 20 and the bypass pipe 30 .
[0047] It should be noted that the lower fixing ring 54 has a similar structure and function as the upper fixing ring 52 , and a detailed description thereof is omitted here.
[0048] Figure 5 for Figure 1 FIG. 1 is a schematic diagram of another embodiment of the lower retaining ring 54 of the gravel pack screen 100 with a bypass line. Figure 5 As shown, the fan-shaped hole 45 on the lower fixing ring 54 corresponding to the bypass pipe 30 is configured as a flat plate 46 capable of closing the lower end of the bypass pipe 30. Thus, the flat plate 46 can hinder the fluid in the bypass pipe 30 from moving downward, so that the sand-containing fluid can accumulate in the bypass pipe 30, thereby having a greater pressure.
[0049] It is easy to understand that as the pressure increases, when a gap that needs to be filled appears in the formation, the fluid in the bypass pipe 30 can be ejected more quickly and forcefully, thereby improving the filling effect of the formation gap.
[0050] like Figure 1 As shown, a connecting pipe joint 60 is sleeved on the step portion 40 at the upper end of the upper fixing ring 52 and the lower end of the lower fixing ring 54, respectively.
[0051] Figure 6 for Figure 1 FIG. 1 is a schematic diagram of a connecting pipe joint 60 of a gravel pack screen 100 with a bypass line. Figure 6As shown, baffles 62 and second bypass holes 64 are evenly arranged on the outer wall of the connecting pipe joint 60 along the circumferential direction. The second bypass holes 64 can connect the inner and outer sides of the connecting pipe joint 60, thereby allowing the sand-containing fluid to flow. The baffles 62 can separate the inner and outer sides of the connecting pipe joint 60, thereby hindering the flow of the sand-containing fluid.
[0052] In the present invention, the connecting pipe joint 60 forms a sliding fit with the upper fixing ring 52, the lower fixing ring 54 and the step portion 40 respectively. The connection mode is set as a threaded connection. Thus, the connecting pipe joint 60 can rotate relative to the base pipe 10, so that the second bypass hole 64 is in a first relative position corresponding to the flow guide pipe 20 and a second relative position corresponding to the bypass pipe 30.
[0053] It is easy to understand that when the second bypass hole 64 corresponds to the flow guide pipe 20, the fluid in the flow guide pipe 20 can quickly flow out from the second bypass hole 64 on any one of the connecting pipe joints 60. When the second bypass hole 64 corresponds to the bypass pipe 30, the fluid in the bypass pipe 30 can quickly flow out from the second bypass hole 64 on any one of the connecting pipe joints 60.
[0054] Thus, by rotating the connecting pipe joint 60, the operator can quickly discharge the fluid in any section of the flow guide pipe 20 and the bypass pipe 30, thereby facilitating the next installation, disassembly or maintenance operation. This arrangement can greatly reduce the difficulty of connecting or disassembling multiple base pipes 10.
[0055] In addition, the operator can also adjust the angle of the base pipe 10 by rotating the circumferential angle of any connecting pipe joint 60 on any two adjacent base pipe sections 10 to achieve alignment of any two adjacent base pipes 10, thereby making it easier to assemble the gravel packing screen 100 with a bypass pipeline of the present invention.
[0056] In an embodiment not shown, sealing members are respectively provided at the connection parts of the connecting pipe joint 60 and the step part 40, the upper fixing ring 52 and the lower fixing ring 54. The sealing members may be sealing rings, for example. The sealing members can prevent fluid leakage and interfere with the normal discharge of the fluid.
[0057] like Figure 1As shown, an annular retaining ring 65 is respectively provided on one end of the two connecting pipe joints 60 away from the flow guide pipe 20. The retaining ring 65 is configured in an annular shape, and is arranged to be fixedly connected to the outer wall of the step portion 40 and abut against the connecting pipe joint 60. Thus, the retaining ring 65 can limit the axial movement of the connecting pipe joint 60 along the base pipe 10, so that the connecting pipe joint 60 can only rotate in the circumferential direction, thereby improving the reliability of the connection of the connecting pipe joint 60.
[0058] In a preferred embodiment, a protective tube (not shown) is further sleeved on the outer side of the flow guide tube 20. The protective tube can be made of metal material, for example, so as to support and protect the base pipe 10, the flow guide tube 20 and the bypass tube 30. Necessarily, through holes corresponding to the return holes 15 and the first bypass holes 35 are provided on the outer wall of the protective tube 70, so as to prevent the protective tube 70 from interfering with the normal movement of the downhole fluid.
[0059] The working process of the gravel packing screen 100 with a bypass pipeline according to the present invention is briefly described below.
[0060] The gravel packing screen 100 with a bypass pipe of the present invention is used for filling operations in oil wells or formations. When filling formations or oil wells is required, operators can connect multiple base pipes 10 in series, and then introduce sand-containing fluid through the wellhead to the flow guide pipe 20 and the bypass pipe 30. At this time, the fluid will flow downward along the flow guide pipe 20 and the bypass pipe 30.
[0061] When the sand-containing fluid flows through the formation gap, part of the fluid will be ejected from the first bypass hole 35, thereby filling the formation. Then, the gravel in the sand-containing fluid will be blocked by the filter pipe in the formation outside the base pipe 10, and the fluid without sand will flow back to the wellhead through the base pipe 10, thereby filling the formation.
[0062] Subsequently, when the sand-containing fluid passes through the connection portion of two adjacent base pipes 10, part of the fluid in the flow guide pipe 20 will flow back into the bypass pipe 30 until the fluid pressures in the flow guide pipe 20 and the bypass pipe 30 are balanced, thereby replenishing the sand-containing fluid consumed in the bypass pipe 30 and ensuring smooth subsequent filling operations.
[0063] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims
1. A gravel pack screen with a bypass pipeline, comprising: A base pipe (10) is arranged in an oil well, wherein a flowback channel (12) for fluid circulation is defined in the base pipe, and flowback holes (15) are evenly arranged on the outer wall of the base pipe and connect the flowback channel with the outer space of the base pipe; a flow guide pipe (20) and a bypass pipe (30) uniformly arranged on the outer wall of the base pipe along the circumferential direction, wherein the flow guide pipe and the bypass pipe are both configured to be in an arc shape matching the outer wall of the base pipe and extending along the outer wall of the base pipe, so that the flow guide pipe and the bypass pipe can be sleeved on the outer wall of the base pipe; and A flow guide channel (25) is arranged in the flow guide pipe and the bypass pipe, so that downhole fluid can move in the flow guide pipe and the bypass pipe along the axial direction of the base pipe. A plurality of first bypass holes connected to the flow guide channel are evenly arranged in the axial direction on the outer wall of the bypass pipe at one end away from the base pipe, so that the fluid in the bypass pipe can be discharged into the oil well. An annular channel (39) is formed between the base pipe and the flow guide pipe and the bypass pipe in the radial direction. A filter pipe for preventing gravel from passing through is arranged in the annular channel. A gap is arranged between the circumferential parts of any two adjacent flow guide pipes and bypass pipes, so that downhole fluid outside the base pipe can flow from the gap through the filter pipe and the return hole to the return channel.
2. A gravel pack screen with a bypass pipe according to claim 1, characterized in that: Step portions (40) are respectively provided on the outer walls of the base pipe at both axial ends of the flow guide pipe and the bypass pipe, and the flow guide pipe and the bypass pipe are arranged to abut against the step portions so as to limit the axial movement of the flow guide pipe and the bypass pipe. An extension portion (42) extending in the axial direction is arranged on the outer wall of the flow guide pipe and the bypass pipe at a side away from the base pipe, and the extension portion can pass through the step portion along the outer wall of the step portion.
3. A gravel pack screen with a bypass pipeline according to claim 2, characterized in that: An upper fixing ring (52) and a lower fixing ring (54) are sleeved on the outer walls of the step portions at the upper and lower sides of the guide tube, and a plurality of fan-shaped holes (45) are evenly arranged along the circumferential direction on the inner walls of the upper fixing ring and the lower fixing ring to match the extension portion and allow the extension portion to pass through. The upper fixing ring and the lower fixing ring are fixedly connected to the step portion so as to limit the extension portion from rotating along the circumferential direction of the base pipe.
4. A gravel pack screen with a bypass line according to claim 3, characterized in that: The fan-shaped hole on the lower fixing ring corresponding to the bypass pipe is configured as a flat plate (46) capable of closing the lower end of the bypass pipe, thereby preventing the fluid in the bypass pipe from moving downward.
5. A gravel pack screen with a bypass line according to claim 4, characterized in that: A connecting pipe joint (60) is sleeved on the step portions at the upper end of the upper fixing ring and the lower end of the lower fixing ring, and baffles and second bypass holes are evenly arranged on the outer wall of the connecting pipe joint along the circumferential direction. The connecting pipe joint forms a sliding fit with the upper fixing ring, the lower fixing ring and the step portion respectively, so that the connecting pipe joint can rotate relative to the base pipe, thereby making the second bypass hole in a first relative position corresponding to the flow guide pipe and a second relative position corresponding to the bypass pipe.
6. A gravel pack screen with a bypass line according to claim 5, characterized in that: Sealing members are also provided at the connection parts of the connecting pipe joint, the step part, the upper fixing ring and the lower fixing ring respectively.
7. A gravel pack screen with a bypass line according to claim 6, characterized in that: An annular retaining ring (65) is sleeved on one end of the connecting pipe joint away from the guide pipe. The retaining ring is fixedly connected to the outer wall of the step portion and abuts against the connecting pipe joint, thereby limiting the axial movement of the connecting pipe joint.
8. A gravel pack screen with a bypass line according to claim 1, characterized in that: Protective covers are respectively provided on the first bypass hole and the second bypass hole, and the protective covers are made of rubber material.
9. A gravel pack screen with a bypass pipeline according to any one of claims 1 to 8, characterized in that: The filter tube is arranged in the gap so that the filter tube is arranged between the flow guide tube and the bypass tube in the circumferential direction. The flow guide pipe, the bypass pipe and the filter pipe are arranged to be closely attached to the outer wall of the base pipe.
10. A gravel pack screen with a bypass pipeline according to any one of claims 1 to 8, characterized in that: A protective tube is also sleeved on the outer side of the flow guide pipe, and through holes corresponding to the return holes and the first bypass holes are arranged on the outer wall of the protective tube.