Anti-jamming pipe-end upsetting direct connection type drill pipe
By designing upset ends, spiral guide grooves, and trapezoidal threads on the drill pipe, the problems of drill pipe jamming and breakage under high loads have been solved, achieving efficient and safe drilling operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHIJIAZHUANG WEILIDA PROSPECTING MASCH CO LTD
- Filing Date
- 2025-10-13
- Publication Date
- 2026-08-04
AI Technical Summary
Existing drill pipes are prone to jamming and breakage under high loads and complex working conditions, affecting drilling efficiency and safety.
The design employs an upsetting end, combined with structures such as a spiral guide groove, trapezoidal thread, elastic damping ring, and guide hole, to optimize fluid pressure distribution and reduce vibration, thereby enhancing the strength and stability of the drill pipe.
It effectively reduces drill pipe jamming and breakage problems, improves drilling efficiency and safety, and reduces fluid resistance and vibration amplitude.
Smart Images
Figure CN224592091U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of mechanical connections and pipeline structures, and in particular to a pipe end upset straight-connection drill pipe with anti-jamming properties. Background Technology
[0002] In oil drilling operations, drill pipe, as a crucial component connecting the drill bit and surface equipment, directly impacts drilling efficiency and safety. With increasing drilling depth, drill pipe is prone to jamming and breakage under high loads, high rotational speeds, and complex geological conditions, leading to reduced drilling efficiency and even safety accidents. To improve drill pipe reliability, the industry has conducted extensive research in recent years on drill pipe structural design and material properties, primarily focusing on enhancing strength, wear resistance, and fatigue resistance. This research is of great significance for ensuring the smooth operation of oil drilling.
[0003] Currently, common methods for drill pipe connections include threaded connections and welded connections. Threaded connections are a more common method, offering the advantage of easy disassembly and are widely used in many ordinary working conditions. Welded connections, on the other hand, are valued for their higher strength and are used in applications requiring high connection strength. Additionally, some drill pipes employ end-upsetting technology to enhance the strength of the connection. These methods have their own application scenarios in different situations, providing a variety of options for drill pipe connections.
[0004] In existing technologies, both threaded and welded connections suffer from insufficient strength and susceptibility to damage. Especially under high loads and complex operating conditions, drill pipes are prone to jamming and breakage, affecting drilling efficiency and safety. Utility Model Content
[0005] To address the aforementioned issues, this application provides a pipe end upset straight-connection drill pipe with anti-jamming properties.
[0006] The anti-jamming pipe end upset straight-connection drill pipe provided in this application adopts the following technical solution: A type of anti-jamming, pipe-end upset straight-connection drill pipe includes a pipe body, upset ends disposed at both ends of the pipe body, and a connecting part sleeved on the outside of the upset ends. The outer surface of the upset ends is provided with a guide groove, which is spiral in shape and the groove depth gradually changes along the axial direction. The inner ring of the connecting part is provided with an inner ring thread, and the outer ring is provided with an outer ring thread. Both the inner and outer ring threads are trapezoidal threads, and the thread crests and roots are provided with transition fillets. The connection between the upset ends and the pipe body is provided with a diffusion groove, and an elastic damping ring is embedded in the groove.
[0007] By adopting the above technical solutions, during oil drilling operations, the spiral guide groove at the upset end can automatically adjust the pressure distribution of the fluid according to the well depth, effectively avoiding mud jamming caused by local high pressure in the pipe body. The rounded corner design of the trapezoidal thread on the connection reduces the stress concentration points of traditional threads, and the elastic damping ring inside the diffusion groove can also reduce the lateral vibration amplitude of the pipe body, thereby increasing the strength of the pipe body and the stability during operation, effectively reducing the problems of pipe body jamming and easy breakage.
[0008] Optionally, the bottom of the guide channel is provided with multiple sets of protrusions and pits, which are arranged at equal intervals along the length of the guide channel. Each set of protrusions and pits is radially alternately distributed along the upsetting end, and the surfaces between the protrusions and pits are smoothly transitioned.
[0009] By adopting the above technical solution, the alternating protrusions and depressions in the guide channel can form micro-vortices, effectively reducing rock debris deposition.
[0010] Optionally, the bearing surface of the trapezoidal thread is set as an inner concave curved surface, and the guide surface is set as an outer convex curved surface, forming a continuous transition zone between the two curved surfaces.
[0011] By adopting the above technical solutions, the concave curved surface can improve the torsional strength of the threaded connection, and the continuous transition zone can reduce the fretting wear of traditional threads under alternating loads.
[0012] Optionally, the outer circumferential surface of the elastic damping ring is provided with multiple anti-slip ridges, and the inner circumferential surface is provided with multiple cavities. The multiple anti-slip ridges and cavities are distributed at intervals along the circumference of the elastic damping ring.
[0013] By adopting the above technical solutions, the anti-slip rib structure can effectively prevent the elastic damping ring from shifting, and the cavity can reduce the impact load on the pipe body when passing through the formation, thereby reducing the vibration amplitude of the pipe body in the well.
[0014] Optionally, a guide hole is provided inside the upsetting end, and a guide vane is fixed inside the guide hole. The guide vane is arranged axially along the upsetting end.
[0015] By adopting the above technical solutions, the suspension efficiency of rock cuttings can be effectively improved.
[0016] Optionally, the inlet of the guide hole narrows inward, the diameter is equal in the middle, and the outlet diffuses outward.
[0017] By adopting the above technical solution, the guide hole is in the form of contraction-diffusion, which can effectively reduce the fluid resistance of the pipe body in drilling and realize intelligent regulation of drilling fluid flow rate.
[0018] Optionally, the inner wall of the tube is provided with multiple spiral ribs, the main body of the spiral ribs is streamlined and the two ends are bifurcated, and the multiple spiral ribs are distributed at intervals along the length of the tube.
[0019] By adopting the above technical solution, the streamlined part of the spiral rib can reduce the pump pressure requirement, and the bifurcated shape at both ends can effectively solve the problem of easy clogging of traditional continuous spiral ribs.
[0020] Optionally, the outer surface of the upsetting end is provided with a composite coating.
[0021] By adopting the above technical solutions, composite coatings can improve corrosion resistance.
[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The two ends of the pipe are upset to thicken the pipe diameter, forming upset ends. Upset ends can effectively increase the strength of the pipe. The end of the upset end away from the pipe is connected to the connecting part. The spiral guide groove set on the outer surface of the upset end can effectively reduce fluid pressure, thereby reducing jamming. The trapezoidal thread reduces stress concentration, thereby reducing pipe breakage. 2. The guide holes inside the upsetting end can reduce fluid resistance and regulate flow rate, thereby reducing jamming problems; 3. Elastic damping rings can reduce the vibration amplitude of the tube body and the upset end. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional structural diagram of the overall embodiment.
[0024] In the figure, 1 is the tube body; 11 is the spiral rib; 2 is the upset end; 21 is the guide hole; 22 is the guide groove; 3 is the connecting part; 31 is the trapezoidal thread; 4 is the diffuser groove; 5 is the elastic damping ring; 51 is the anti-slip ridge; 52 is the cavity; 6 is the guide column; and 61 is the guide blade. Detailed Implementation
[0025] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.
[0026] This application discloses an anti-jamming pipe end upset straight-connection drill pipe.
[0027] refer to Figure 1A type of anti-jamming pipe end upset straight-connection drill rod includes a pipe body 1. Both ends of the pipe body 1 are formed into upset ends 2 using a three-stage thickening process. The end of the upset end 2 away from the pipe body 1 is connected to a connecting part 3. The diameter of the connecting part 3 gradually decreases from the end closer to the pipe body 1 to the end farther away from the pipe body 1. The inner ring of the connecting part 3 is provided with an inner ring thread, and the outer ring is provided with an outer ring thread.
[0028] refer to Figure 1 and Figure 2 The inner wall of the tube body 1 is fixed with multiple intermittent spiral ribs 11. The multiple spiral ribs 11 are distributed at intervals along the length of the tube body 1. The main body of the spiral rib 11 is streamlined and the two ends are bifurcated. The spiral rib 11 is embedded with axial reinforcing fiber bundles.
[0029] refer to Figure 1 and Figure 2 The outer surface of the upsetting end 2 is provided with a guide groove 22. The guide groove 22 is spiral in shape, and the depth of the groove gradually increases from the end close to the pipe body 1 to the end away from the pipe body 1 along the axial direction. The bottom of the guide groove 22 is provided with multiple sets of alternating hemispherical protrusions and conical pits. The protrusions and pits in each set are radially distributed along the upsetting end 2, and the protrusions and pits between each set are equally spaced along the upsetting end 2. The surfaces of the protrusions and pits are smoothly transitioned. The alternating protrusions and pits can form micro-turbulence, which facilitates the breaking of the adhesion of mud and sand on the well wall and reduces frictional resistance.
[0030] The upset end 2 is provided with a flow guide hole 21. The inlet of the flow guide hole 21 is constricted inward, the diameter is equal in the middle position, and the outlet is diffused outward, which can effectively reduce the fluid resistance in the pipe body 1. The flow guide hole 21 is provided with a flow guide column 6 and a flow guide blade 61. The flow guide column 6 is fixed along the axial direction of the pipe body 1, and the flow guide blade 61 is spirally fixed along the length direction of the flow guide column 6.
[0031] The connection between the upset end 2 and the pipe body 1 adopts a stepped diameter change form, that is, the upset end 2 adopts a segmented change according to the different pipe diameters, which facilitates the connection of pipe bodies 1 with different diameters. Furthermore, the upset end 2 and the pipe body 1 are connected by a smooth buffer platform, which helps to reduce fluid resistance.
[0032] The outer surface of the upsetting end 2 is provided with a composite coating, and the surface of the coating has a non-smooth microstructure.
[0033] refer to Figure 1 and Figure 2 The inner and outer ring threads of the connecting part 3 are both trapezoidal threads 31. The thread crest and root are provided with transition fillets, which can effectively reduce the stress concentration characteristics of traditional threads. The bearing surface of the trapezoidal thread 31 is set as an inner concave curved surface and the guide surface is set as an outer convex curved surface. A continuous transition zone is formed between the two curved surfaces, which improves tensile strength and extends fatigue life.
[0034] refer to Figure 1 and Figure 2 An annular stress diffusion groove 4 is provided at the connection between the upset end 2 and the pipe body 1. An elastic damping ring 5 is embedded in the groove. The elastic damping ring 5 can be made of copper alloy or polyether ether ketone material. An axial anti-slip rib 51 is fixedly provided on the outer circumferential surface of the elastic damping ring 5, and a radial buffer cavity 52 is opened on the inner circumferential surface. This can effectively reduce the vibration amplitude of the upset end 2 and reduce the lateral displacement of the pipe body 1 and the upset end 2.
[0035] The implementation principle of the anti-jamming pipe end upset straight connection drill pipe of this application embodiment is as follows: First, the two ends of the pipe body 1 are formed into upset ends 2 using a three-stage thickening process. Then, the connecting part 3 is threaded to the outside of the upset ends 2. The upset ends 2 are milled on a CNC machine tool to form trapezoidal threads 31 and guide grooves 22. Next, the elastic damping ring 5 is pressed into the diffusion groove 4 using a cold fitting process. Then, the upset ends 2 are sprayed with a surface treatment. When the pipe body 1 is inserted into the well for drilling, the spiral guide groove 22 can break the mud cake on the well wall, and the guide column 6 and guide blade 61 can agitate and remove the sediment at the bottom of the well. The trapezoidal thread 31 and transition fillet design of the upset ends 2 can effectively reduce concentrated stress.
[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A type of anti-jamming, pipe-end upset, straight-connection drill pipe, characterized in that: It includes a pipe body (1), upsetting ends (2) set at both ends of the pipe body (1), and a connecting part (3) sleeved on the outside of the upsetting ends (2). The outer surface of the upsetting ends (2) is provided with a guide groove (22). The guide groove (22) is spiral and the groove depth gradually changes along the axial direction. The inner ring of the connecting part (3) is provided with an inner ring thread, and the outer ring is provided with an outer ring thread. Both the inner ring thread and the outer ring thread are trapezoidal threads (31). The thread crest and root are provided with transition fillets. The connection between the upsetting ends (2) and the pipe body (1) is provided with a diffusion groove (4), and an elastic damping ring (5) is embedded in the groove.
2. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The bottom of the guide groove (22) is provided with multiple sets of protrusions and pits. The multiple sets of protrusions and pits are arranged at equal intervals along the length of the guide groove (22). Each set of protrusions and pits is radially alternately distributed along the upsetting end (2), and the surfaces between the protrusions and pits are smoothly transitioned.
3. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The bearing surface of the trapezoidal thread (31) is set as an inner concave curved surface, and the guide surface is set as an outer convex curved surface, forming a continuous transition zone between the two curved surfaces.
4. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The outer circumferential surface of the elastic damping ring (5) is provided with multiple anti-slip ridges (51), and the inner circumferential surface is provided with multiple cavities (52). The multiple anti-slip ridges (51) and cavities (52) are distributed at intervals along the circumference of the elastic damping ring (5).
5. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The upset end (2) has a flow guide hole (21) inside, and a flow guide blade (61) is fixed inside the flow guide hole (21). The flow guide blade (61) is arranged along the axial direction of the upset end (2).
6. A straight-connection drill pipe with anti-jamming end upsetting as described in claim 5, characterized in that: The inlet of the guide hole (21) narrows inward, the diameter is equal in the middle, and the outlet diffuses outward.
7. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The inner wall of the tube (1) is provided with multiple spiral ribs (11). The main body of the spiral ribs (11) is streamlined and bifurcated at both ends. The multiple spiral ribs (11) are distributed at intervals along the length of the tube (1).
8. The anti-jamming pipe end upset straight-connection drill pipe according to claim 1, characterized in that: The outer surface of the upsetting end (2) is provided with a composite coating.