An anti-scouring structure for eccentric flow channel holes

Abstract

This invention belongs to the field of logging-while-drilling technology and discloses an anti-scouring structure for eccentric flow channel holes. It includes an anti-scouring ring at the inlet of the eccentric flow channel hole, which has an inclined hole formed inside to guide the central fluid into the eccentric flow channel hole. An anti-rotation pin is also provided on the anti-scouring ring to fix it and prevent rotation. The anti-scouring ring is axially limited by an upper flow channel conversion joint. A large flow channel conversion joint with an axially guided flow hole is located at the outlet of the eccentric flow channel hole. A flow-breaking cone is fixed to the bottom of the axially guided flow hole by a single support. The eccentric flow channel hole includes a middle equal-diameter section and a tail large-diameter section connected to it for installing the large flow channel conversion joint. A chamfer is formed at the connection between the two sections, with the tip of the chamfer forming a transition fillet. The central rotation point is located on the center line of the electronic framework. The inner side of the large flow channel conversion joint abuts against the tail of the transition fillet. The anti-scouring structure for eccentric flow channel holes of this invention can improve the service life of the eccentric flow channel.

Description

Technical Field

[0001] This invention relates to the field of logging while drilling technology, and specifically to an anti-scouring structure for eccentric flow channel holes. Background Technology

[0002] Logging while drilling tools typically employ a structure in which the drill collar is sealed inside and an electronic skeleton is inserted. The electronic skeleton is used to carry circuit boards and sensors. Its outer diameter is separated from the drill collar's inner diameter by a sealing ring, which isolates the drilling fluid. The drilling fluid flows through the channel in the middle of the electronic skeleton.

[0003] As logging-while-drilling tools become increasingly integrated, more circuit boards and sensors are being integrated onto the electronic framework. To ensure the wall thickness between the flow channel and the bottom of the circuit slot, an eccentric design is required for the flow channel (i.e., such as...). Figure 1 As shown, L1 > L2), but this eccentric design will cause the drilling fluid to generate turbulence at the inlet and outlet of the channel due to a sudden change in flow direction, which will cause severe erosion of the inner wall of the electronic skeleton at the inlet and outlet of the channel, thus seriously affecting the service life of the channel. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes an anti-scouring structure for eccentric flow channel holes, which is suitable for eccentric flow channels, in order to improve the service life of eccentric flow channels.

[0005] The anti-scouring structure for the eccentric flow channel hole according to the present invention includes: an anti-scouring ring disposed at the inlet of the eccentric flow channel hole of the electronic skeleton, the anti-scouring ring having an oblique hole formed therein for guiding the central fluid to the eccentric flow channel hole, and an anti-rotation pin connected to the anti-scouring ring for fixing the anti-scouring ring at the inlet of the eccentric flow channel hole to prevent the anti-scouring ring from rotating circumferentially, the anti-scouring ring being axially limited at the inlet of the eccentric flow channel hole by an upper flow channel conversion joint; and a large flow channel hole conversion joint disposed at the outlet of the eccentric flow channel hole of the electronic skeleton, the eccentric flow channel hole including an intermediate... The system includes a constant diameter section and a large diameter tail section connected to the intermediate constant diameter section for mounting a large flow channel conversion connector. The inner diameter of the large diameter tail section is larger than that of the intermediate constant diameter section. An axial guide flow hole is formed inside the large flow channel conversion connector. A flow-breaking cone is fixedly connected to the bottom of the axial guide flow hole through a single support. A chamfer is formed at the connection between the intermediate constant diameter section and the large diameter tail section. The tip of the chamfer is formed as a transition fillet. The inner side of the large flow channel conversion connector abuts against the tail of the transition fillet. The center rotation point of the transition fillet is located on the center line of the electronic skeleton.

[0006] Furthermore, the tilt angle of the oblique hole is adjusted according to the eccentricity of the electronic skeleton, and the axis of the oblique hole forms an angle of 5~30° with the center line of the electronic skeleton.

[0007] Furthermore, the large flow channel adapter is fixed to the inner wall of the large diameter section at the tail end by multiple circumferentially distributed set screws.

[0008] Furthermore, the flow-breaking cone has a cone structure and is located at the center of the axial guide flow hole.

[0009] Furthermore, the single support portion is formed into a cylindrical or sheet-like shape.

[0010] Furthermore, the inner surfaces of the anti-impact ring, eccentric flow channel hole, and large flow channel hole conversion joint are all shot peened and / or coated.

[0011] Furthermore, the coating is a tungsten carbide or ceramic wear-resistant coating.

[0012] Furthermore, both the anti-impact ring and the large flow channel conversion joint are made of nickel-chromium-based high-temperature alloy.

[0013] The logging-while-drilling tool according to the present invention includes a drill collar and an electronic skeleton sealed and inserted inside the drill collar, wherein the electronic skeleton is provided with the aforementioned anti-scouring structure for the eccentric flow channel hole.

[0014] The anti-scouring structure for eccentric flow channel holes of this invention achieves comprehensive and effective protection for eccentric flow channel holes through various innovative designs and structural combinations, such as a special anti-scouring ring, a large flow channel hole conversion joint, chamfers and transition fillets, as well as the use of advanced shot peening treatment and high-performance coating materials. Compared with existing technologies, it is not only more rational and perfect in structural design, capable of providing precise scouring protection for the characteristics of eccentric flow channel holes, but also significantly improves the wear resistance and corrosion resistance of the structure through improved materials and surface treatment processes. These improvements effectively extend the service life of the electronic skeleton, reduce maintenance costs, and improve the reliability and efficiency of logging-while-drilling tools, demonstrating significant technical advantages and practical application value, and providing a better solution to the scouring problem of eccentric flow channel holes in logging-while-drilling tools. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-scouring structure for eccentric flow channel holes according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 The diagram shows the structure of the anti-impact ring;

[0017] Figure 3 for Figure 1 The diagram shows the structure of the large flow channel orifice adapter.

[0018] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the structure of the large flow channel conversion joint. Detailed Implementation

[0019] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 The structure of an anti-scouring structure for an eccentric flow channel hole according to an embodiment of the present invention is shown. Combined with... Figures 1 to 4 As shown, the anti-scouring structure for the eccentric flow channel hole may include: an anti-scouring ring 1 disposed at the inlet of the eccentric flow channel hole 103 of the electronic skeleton 100, wherein the anti-scouring ring 1 has an oblique hole 11 formed therein for guiding the central fluid to the eccentric flow channel hole 103 (e.g., Figure 2 As shown), the anti-impact ring 1 is also connected to an anti-rotation pin 13 for fixing the anti-impact ring 1 at the entrance of the eccentric flow channel hole 103 to prevent the anti-impact ring 1 from rotating circumferentially. The anti-impact ring 1 is axially limited at the entrance of the eccentric flow channel hole 103 by the upper flow channel conversion joint 2; and a large flow channel hole conversion joint 3 is provided at the outlet of the eccentric flow channel hole 103 of the electronic skeleton 100. The eccentric flow channel hole 103 includes an intermediate equal-diameter section 101 and a tail large-diameter section 102 connected to the intermediate equal-diameter section 101 for installing the large flow channel hole conversion joint 3. The inner diameter of the tail large-diameter section 102 is larger than the inner diameter of the intermediate equal-diameter section 101, such as Figure 3 and Figure 4 As shown, an axial guide flow hole 31 is formed inside the large flow channel conversion joint 3. The bottom of the axial guide flow hole 31 is fixedly connected to a flow-breaking cone 32 by a single support part 33. A chamfer 4 is formed at the connection between the middle equal diameter section 101 and the tail large diameter section 102. The tip of the chamfer is formed as a transition fillet. The inner side of the large flow channel conversion joint 3 abuts against the tail of the transition fillet. The center rotation point of the transition fillet is located on the center line of the electronic skeleton 100.

[0021] In the eccentric flow channel hole anti-scouring structure of this embodiment of the invention, during the operation of the logging-while-drilling tool, the drilling fluid first flows into the anti-scouring ring 1. The inclined hole 11 of the anti-scouring ring 1 can adjust the tilt angle according to the eccentricity of the electronic skeleton 100, accurately guiding the central fluid to the inlet of the eccentric flow channel hole 103, so that the drilling fluid can enter the eccentric flow channel hole 103 evenly and smoothly, avoiding scouring and wear at the inlet caused by direct impact. After the drilling fluid enters the eccentric flow channel hole 103, it flows along the hole wall. The middle constant diameter section 101 of the eccentric flow channel hole 103... To provide a stable flow channel for drilling fluid, the chamfer 4 and the transition fillet at the tip of the chamfer 4, located at the connection between the equal-diameter section 101 and the large-diameter section 102 at the tail of the eccentric flow channel 103, can more smoothly guide the drilling fluid from the eccentric flow channel 103 into the large flow channel conversion joint 3. The chamfer 4 and the transition fillet, on the one hand, make the flow of drilling fluid smoother, avoiding local eddies and high-speed impacts caused by abrupt shape changes, further reducing erosion at the connection between the electronic skeleton 100 and the large flow channel conversion joint 3; on the other hand… The increased surface area of ​​the drilling fluid flowing out through the large flow channel adapter 3 helps to reduce fluid velocity, thereby further reducing scouring of the connection between the electronic skeleton 100 and the large flow channel adapter 3. The large diameter section 102 at the tail provides space for the installation of the large flow channel adapter 3. Under the action of the flow-breaking cone 32, the drilling fluid is dispersed and flows into the axial guide flow hole 31 of the large flow channel adapter 3. The flow-breaking cone 32 changes the flow pattern of the drilling fluid, reducing scouring of the middle part of the large flow channel adapter 3. Meanwhile, the single support 33 reduces the flow resistance area within the large flow channel conversion joint 3, thereby reducing scouring, and also ensures the stability and reliability of the flow-breaking cone 32. The center rotation point of the transition fillet is located on the centerline 104 of the electronic skeleton 100. This arrangement allows the drilling fluid to flow more smoothly when exiting the eccentric flow channel 103, further reducing scouring at the connection point and preventing the drilling fluid from generating local eddies and high-speed impacts at the transition fillet, thus protecting the connection between the electronic skeleton 100 and the large flow channel conversion joint 3. Preferably, the inclination angle of the chamfer 4 can be 45°-60°, and the radius of the transition fillet can be greater than 5mm.

[0022] The anti-scouring structure for the eccentric flow channel hole in this embodiment of the invention uses the inclined hole 11 of the anti-scouring ring 1 to guide the flow, converting vertical impact into tangential flow. The anti-rotation pin 13 prevents the anti-scouring ring 1 from rotating circumferentially, ensuring accurate flow guidance through the inclined hole 11. The upper flow channel conversion joint 2 axially limits the anti-scouring ring 1, allowing it to stably guide the fluid to the eccentric flow channel hole 103, thereby effectively reducing scouring at the inlet of the eccentric flow channel hole 103. The chamfer 4 and transition fillet are located at the connection between the middle equal diameter section 101 and the tail large diameter section 102. Under the combined action of the flow-breaking cone 32, they can guide the drilling fluid smoothly into the large flow channel hole conversion joint 3, helping to eliminate turbulence at the connection and reducing the risk of boundary layer stripping at the outlet of the eccentric flow channel hole 103, thereby reducing the scouring of the connection by the drilling fluid. The inner diameter of the large-diameter section 102 is larger than that of the intermediate equal-diameter section 101, providing installation space for the large-flow-channel conversion joint 3. The axial guide flow hole 31 and the flow-breaking cone 32 connected to the single support part 33 can break the drilling fluid and reduce the scouring of the middle part of the large-flow-channel conversion joint 3. Furthermore, the inner side of the large-flow-channel conversion joint 3 abuts against the tail of the transition fillet, which can further prevent the drilling fluid from impacting the connection between the intermediate equal-diameter section 101 and the tail large-diameter section 102. The center rotation point of the transition fillet is located on the center line 104 of the electronic skeleton 100, which can make the drilling fluid flow more smoothly when flowing out of the eccentric flow channel hole 103, prevent the drilling fluid from generating local eddies and high-speed impacts at the transition fillet, and protect the connection between the electronic skeleton 100 and the large-flow-channel conversion joint 3.

[0023] In such Figure 1 and Figure 2 In the preferred embodiment shown, the axis of the oblique hole 11 can form an angle of 5 to 30° with the center line 104 of the electronic skeleton 100. This angle range allows for more precise guidance of the central fluid to the eccentric flow channel hole 103, adapting to the needs of eccentric flow channel holes 103 with different degrees of eccentricity, and enhancing the versatility and specificity of the anti-scouring structure for eccentric flow channel holes.

[0024] In such Figure 1 , Figure 3 as well as Figure 4 In the preferred embodiment shown, the large flow channel adapter 3 is fixed to the inner wall of the large-diameter tail section 102 by a plurality of circumferentially distributed set screws 34. This fixing method is firm and reliable, ensuring stable installation of the adapter during drilling fluid flow, preventing loosening and displacement, and avoiding uneven fluid impact and structural damage caused by adapter instability. Preferably, there are four set screws 34, and the large flow channel adapter 3 has fixing holes 35 formed on it for mating with the set screws 34.

[0025] According to the present invention, in such Figure 1 and Figure 3In the preferred embodiment shown, the flow-breaking cone 32 can be a conical structure, and the centerline of the flow-breaking cone 32 can coincide with the centerline 104 of the electronic framework 100. This arrangement can evenly distribute the drilling fluid to all directions of the large flow channel conversion joint 3. This uniform distribution can prevent the formation of local high-velocity areas of drilling fluid within the large flow channel conversion joint 3, thereby reducing concentrated scouring of the inner wall of the large flow channel conversion joint 3. At the same time, this arrangement also makes the structure of the entire large flow channel conversion joint 3 more symmetrical. When subjected to the impact force of drilling fluid, it can distribute stress more evenly and reduce the vibration generated during the flow of drilling fluid, reducing local stress concentration caused by asymmetrical design, thereby enhancing the stability and reliability of the structure. Preferably, the cone angle of the flow-breaking cone 32 can be preferably 60°-90°.

[0026] In such Figure 4 In the preferred embodiment shown, the single support portion 33 can be formed in a cylindrical or sheet shape. These two shapes are simple in structure, easy to process, and have high strength, which can stably support the flow-breaking cone 32, ensuring that the flow-breaking cone does not deform or get damaged under the impact of high-speed drilling fluid. At the same time, they have low flow resistance to the drilling fluid, which helps to reduce erosion.

[0027] According to a preferred embodiment of the present invention, the inner wall surfaces of the anti-scour ring 1, the eccentric flow channel hole 103, and the large flow channel hole conversion joint 3 are all subjected to shot peening and / or coating treatment. Shot peening can improve surface hardness and wear resistance, while coating treatment can enhance corrosion resistance and erosion resistance, thereby extending the service life of the entire anti-scour structure and ensuring stable operation in harsh drilling environments.

[0028] Preferably, the coating can be a tungsten carbide or ceramic wear-resistant coating. These two coatings possess excellent wear resistance and corrosion resistance, effectively resisting the erosion of solid particles in drilling fluid and the corrosion of chemical media, further improving the service life and reliability of the anti-erosion structure, and reducing maintenance and replacement costs. Furthermore, the coating thickness is preferably 0.1-0.3 mm.

[0029] According to the present invention, the anti-scour ring 1 and the large flow channel conversion joint 3 are both preferably made of nickel-chromium-based high-temperature alloy (Inconel 718). This material has good high-temperature strength, corrosion resistance and wear resistance, and can maintain stable performance in high-temperature, high-pressure and highly corrosive drilling environments, ensuring long-term reliable operation of the anti-scour structure and meeting the working requirements of logging-while-drilling tools.

[0030] The logging-while-drilling (LOD) tool according to an embodiment of the present invention includes a drill collar and an electronic framework 100 sealed and inserted within the drill collar. The electronic framework 100 is provided with the aforementioned anti-scouring structure for the eccentric flow channel hole. By employing the aforementioned anti-scouring structure for the eccentric flow channel hole, the LOD tool can effectively protect the eccentric flow channel hole 103 of the electronic framework 100, reduce damage caused by drilling fluid scouring, improve the reliability and service life of the LOD tool, reduce the risk of instrument maintenance and scrapping, and ensure the accurate acquisition and transmission of logging data during drilling.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An anti-scouring structure for eccentric flow channel holes, characterized in that, include: An anti-impact ring is provided at the inlet of the eccentric flow channel hole of the electronic skeleton. The anti-impact ring has an inclined hole formed inside for guiding the central fluid to the eccentric flow channel hole. The anti-impact ring is also connected to an anti-rotation pin for fixing the anti-impact ring at the inlet of the eccentric flow channel hole to prevent the anti-impact ring from rotating circumferentially. The anti-impact ring is axially limited at the inlet of the eccentric flow channel hole through an upper flow channel conversion joint. and A large flow channel conversion connector is disposed at the outlet of the eccentric flow channel hole of the electronic skeleton. The eccentric flow channel hole includes an intermediate equal-diameter section and a tail large-diameter section connected to the intermediate equal-diameter section for mounting the large flow channel conversion connector. The inner diameter of the tail large-diameter section is larger than the inner diameter of the intermediate equal-diameter section. An axial guide flow hole is formed inside the large flow channel conversion connector. A flow-breaking cone is fixedly connected to the bottom of the axial guide flow hole by a single support. A chamfer is formed at the connection between the intermediate equal-diameter section and the tail large-diameter section. The tip of the chamfer is formed as a transition fillet. The inner side of the large flow channel conversion joint abuts against the tail of the transition fillet. The center rotation point of the transition fillet is located on the center line of the electronic skeleton.

2. The anti-scouring structure for eccentric flow channel holes according to claim 1, characterized in that, The tilt angle of the oblique hole is adjusted according to the eccentricity of the electronic skeleton, and the axis of the oblique hole forms an angle of 5 to 30° with the center line of the electronic skeleton.

3. The anti-scouring structure for eccentric flow channel holes according to claim 1 or 2, characterized in that, The large flow channel adapter is fixed to the inner wall of the large diameter section at the tail end by multiple circumferentially distributed set screws.

4. The anti-scouring structure for eccentric flow channel holes according to claim 1 or 2, characterized in that, The flow-breaking cone has a cone structure, and the centerline of the flow-breaking cone coincides with the centerline of the electronic skeleton.

5. The anti-scouring structure for eccentric flow channel holes according to claim 1 or 2, characterized in that, The single support portion is formed in a cylindrical or sheet-like shape.

6. The anti-scouring structure for eccentric flow channel holes according to claim 1 or 2, characterized in that, The inner wall surfaces of the anti-impact ring, the eccentric flow channel hole, and the large flow channel hole conversion joint are all shot peened and / or coated.

7. The anti-scouring structure for eccentric flow channel holes according to claim 6, characterized in that, The coating is a tungsten carbide or ceramic wear-resistant coating.

8. The anti-scouring structure for eccentric flow channel holes according to claim 1 or 2, characterized in that, Both the anti-impact ring and the large flow channel conversion joint are made of nickel-chromium-based high-temperature alloy.

9. A logging-while-drilling tool, characterized in that: The invention includes a drill collar and an electronic frame that is sealed and inserted within the drill collar, wherein the electronic frame is provided with an anti-scouring structure for an eccentric flow channel according to any one of claims 1-8.

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