CN121407868A - Integrated combined tool is dragged for to cover - Google Patents
Integrated combined tool is dragged for to coverInfo
- Publication number
- CN121407868A CN121407868A CN202411005461.8A CN202411005461A CN121407868A CN 121407868 A CN121407868 A CN 121407868A CN 202411005461 A CN202411005461 A CN 202411005461A CN 121407868 A CN121407868 A CN 121407868A
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- CN
- China
- Prior art keywords
- fishing
- sleeve
- sand washing
- sand
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to the technical field of oilfield workover tools, in particular to a sleeve-fishing integrated combination tool. The sleeve and drag integrated combination tool comprises a fishing mechanism connected to a sand washing mechanism, wherein a sand washing cylinder in the sand washing mechanism is connected to the bottom end of a sleeve and drag integrated joint, the fishing mechanism penetrates into the sand washing cylinder and is connected to the bottom end of the sleeve and drag integrated joint, the size of the fishing mechanism is matched with that of a salvaged oil pipe and is inserted into the oil pipe, a slip fixed oil pipe is arranged outside the fishing mechanism, a through water channel is arranged on the sleeve and drag integrated joint and the fishing mechanism, a sand washing port connected with the water channel is arranged on the sleeve and drag integrated joint, and a displacement conversion mechanism control sand washing port switch is arranged in the sleeve and drag integrated joint. The sleeve-fishing integrated combination tool is connected with the sand washing mechanism through the fishing mechanism, can carry out fishing after sand washing without replacing the tool, and can carry out sand washing and flushing the sand washing mechanism while carrying out fishing through the cooperation of the water channel and the displacement conversion mechanism, thereby improving the fishing success rate.
Description
Technical Field
The invention relates to the technical field of oilfield workover tools, in particular to a sleeve-fishing integrated combination tool.
Background
In the production or operation process of oil field oil-water wells, the stratum often shows sand phenomenon due to self geological reasons or after fracturing work, and the underground pipe column can be buried after sand is produced to cause sand burying and sticking accidents. In the prior art, the common treatment method for the sand burying and drilling sticking accident is to use a fishing tool to carry out fishing after milling and sand flushing, namely milling and sand flushing work and fishing work are alternately and repeatedly carried out, if the situation that the stratum continuously spits sand is met, repeated milling and sand flushing are needed to be carried out repeatedly until the underground condition meets the fishing condition, and the treatment difficulty is high, the working procedure is complex and the construction period is long. Welding is often used in the existing milling tool for connection, the non-concentricity among the tools is very easy to occur in the welding process, secondary accidents are easy to break off during operation, and the operation is complex. Therefore, the sleeve-drag integrated combination tool is provided for overcoming the defects.
Disclosure of Invention
First, the technical problem to be solved
Aiming at the defects of the prior art, the invention provides a sleeve-fishing integrated combined tool, which solves the problems that when the sand burying and drilling sticking accident is treated, the tool is required to be repeatedly replaced for sand washing and fishing, and the sand washing is required to be repeatedly sleeved, milled and washed for a plurality of times for continuous sand-spitting topography.
(II) technical scheme
In order to solve the above problems, the present invention provides a sleeve-fishing integrated combination tool, comprising:
The sand washing mechanism comprises a sleeve-fishing integrated joint and a sand washing cylinder, the top end of the sand washing cylinder is connected to the bottom end of the sleeve-fishing integrated joint, the fishing mechanism penetrates into the sand washing cylinder, the top end of the fishing mechanism is connected to the bottom end of the sleeve-fishing integrated joint, a fishing tool is inserted into an oil pipe when the device goes down a well, slips are arranged on the fishing tool, the size of the fishing tool is matched with the inner diameter of the oil pipe to be fished, water channels which are axially communicated and correspond to each other are arranged on the sleeve-fishing integrated joint and the fishing mechanism, a plurality of sand washing openings are formed in the side wall of the sleeve-fishing integrated joint, a displacement conversion mechanism is arranged in the sleeve-fishing integrated joint, the sand washing openings are blocked when the displacement conversion mechanism acts, and the sleeve-fishing integrated joint, the fishing mechanism and the sand washing cylinder are detachably connected.
Preferably, the sand washing cylinder comprises a plurality of milling pipes connected end to end, and a milling head is arranged at the bottom end of the milling pipe at the lowest stage.
Preferably, the lower end of the sand washing opening is positioned in the outer wall of the sleeve-fishing integrated joint and vertically penetrates downwards, and the upper end of the sand washing opening is connected with the water channel inwards. .
Preferably, the number of the sand washing openings is two, and the opening at the lower end of the sand washing opening is positioned in the sand washing cylinder.
Preferably, the fishing mechanism comprises a fishing tool and a plurality of slips, wherein the top end of the fishing tool is connected with the bottom of a sleeve-fishing integrated joint, the outer wall of the fishing tool is a conical surface with the diameter gradually shrinking upwards, the slips are uniformly arranged on the outer wall of the fishing tool along the circumferential direction, and the slips can move up and down along the outer wall of the fishing tool.
Preferably, the bottom of the outer wall of the fishing tool is provided with a stop key pin along the circumferential direction.
Preferably, the displacement conversion mechanism comprises a displacement conversion rod, the outer diameter of the displacement conversion rod is matched with a water channel in the sleeve-fishing integrated joint, and a through liquid passing hole is formed in the displacement conversion rod.
Preferably, a mutually matched step structure is arranged between the outer wall of the displacement conversion rod and the inner wall of the sleeve-fishing integrated joint.
Preferably, the sleeve-fishing integrated joint, the fishing mechanism and the sand washing cylinder are connected through threads.
(III) beneficial effects
According to the sleeve-fishing integrated combination tool, the fishing mechanism is connected to the sand washing mechanism, when a sand burying and drilling clamping accident is treated, the fishing operation can be directly carried out after the sand washing operation, tools do not need to be replaced, the workload and the operation procedure are reduced, the working period is shortened, through water channels which are communicated with the sand washing mechanism and the fishing mechanism and correspond to the displacement conversion mechanism are arranged in the sand washing mechanism and the fishing mechanism, the sand washing operation can be carried out while the sand washing operation is carried out, the sand washing mechanism is washed, repeated sleeve milling and sand washing when stratum continuously spitting are avoided, and the fishing success rate is improved.
Drawings
Fig. 1 is a schematic structural view of the sleeve-fishing integrated combination tool of the invention.
The device comprises a sleeve-fishing integrated joint, a sand flushing port, a displacement conversion rod, a slip, a fishing tool, a sleeve-milling pipe, a sleeve-milling head and a blocking key pin, wherein the sleeve-fishing integrated joint is 1.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by "upper", "lower", "inner", "outer", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and are not indicative or implying that the parts referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a casing and fishing integrated combination tool, which specifically includes:
The sand washing device comprises a sand washing mechanism and a salvaging mechanism, wherein the top end of the salvaging mechanism is connected to the sand washing mechanism, sand washing liquid is injected into the sand washing mechanism after the sand washing mechanism is put into a well, sand in the well can be washed, the salvaging mechanism is used for salvaging an underground oil pipe, and the salvaging mechanism can be put into the well along with the sand washing mechanism after being connected with the sand washing mechanism. The sand washing mechanism comprises a sleeve-fishing integrated joint 1 and a sand washing cylinder, wherein the top end of the sand washing cylinder is connected to the bottom end of the sleeve-fishing integrated joint 1, the sleeve-fishing integrated joint 1 is used for being connected with equipment of a wellhead, and the sand washing cylinder is connected to the bottom end of the sleeve-fishing integrated joint 1 and then sent into the underground to be matched with the sleeve-fishing integrated joint 1 for sand washing.
The sand washing cylinder comprises a plurality of milling pipes 6 connected end to end, and a milling head 7 is arranged at the bottom end of the milling pipe 6 at the lowest stage. The bottom of the milling head 7 is provided with a drill bit, and the sand body below can be smashed through rotating the milling sleeve and the milling head 7 in milling, so that the integrity of the sand body is damaged, and the sand washing working efficiency is improved. In general, the dimensions of the milling pipes 6 are the same, and the number of milling pipes 6 can be changed according to the depth of the target milling well in the working process, so that the length of the sand flushing cylinder can be adjusted. The length of the milling tube 6 is generally 1m or 2m, the working length of all milling operations can be almost adapted by adjusting the number of the milling tubes 6, and when the intensity requirement of the milling operations on the sand washing cylinder is high, the length of the milling tube 6 can be prolonged, so that the connecting points on the sand washing cylinder are reduced, and the effect of improving the intensity of the sand washing cylinder is achieved.
It should be noted that the sleeve-fishing integrated joint 1, the fishing mechanism and the sand washing cylinder are detachably connected. Through the mode of detachable connection, the device that can avoid the concentric effect difference between each device that the welding caused to lead to breaks in the pit and forms the secondary accident, improves the stability of device, simultaneously can greatly reduced the work degree of difficulty of device installation and dismantlement, saves operating time. Under general conditions, the sleeve-fishing integrated joint 1, the fishing mechanism and the sand washing cylinder are connected through threads, on the basis of realizing detachable connection, the threads can also provide stronger connection strength at the joint, and the failure of work caused by separation and looseness among all parts in the working process is avoided.
In the invention, the sleeve-fishing integrated joint 1 and the fishing mechanism are both provided with water channels which are axially communicated and correspond to each other in position, and the side wall of the sleeve-fishing integrated joint 1 is provided with a plurality of sand flushing openings 2. The water channel is used as a channel for flowing liquid in sand washing operation, the lower end of the sand washing port 2 is positioned in the outer wall of the sleeve-fishing integrated joint 1 and extends vertically upwards, and the upper end of the sand washing port 2 is connected with the water channel inwards. The liquid can flow out to the surrounding environment along the sand washing opening 2 to wash sand for the sand body in the pit.
In general, the number of the sand washing openings 2 is two, and the sand washing openings 2 are symmetrically arranged on the sleeve-fishing integrated joint 1 along the water channel, so that the liquid flowing out of the sand washing openings 2 can be ensured to have enough pressure to perform sand washing work. In actual operation, the number of the sand washing openings 2 can be adjusted according to the difference between the water pump pressure on site and the liquid pressure required by sand washing operation.
It should be noted that the lower end of the sand washing port 2 is positioned in the outer wall of the sleeve-fishing integrated joint 1 and vertically penetrates downwards, and the upper end of the sand washing port 2 is connected with the water channel inwards. The liquid can be accurately guided between the buried oil pipe and the sand washing cylinder through the sand washing opening 2, so that the accuracy of sand washing work is improved.
As shown in figure 1, the fishing mechanism penetrates into the overshot, the top end of the fishing mechanism is connected to the bottom end of the sleeve-fishing integrated joint 1, a fishing tool is inserted into an oil pipe when the device is put down, a slip 4 is arranged on the fishing tool, the size of the fishing tool is matched with the inner diameter of the oil pipe to be fished, when the fishing mechanism is put down into a target sand flushing well along with the sleeve-fishing integrated joint 1, the fishing mechanism is downwards inserted into the oil pipe, at the moment, the slip 4 is in contact with the inner wall of the oil pipe, and when the sleeve-fishing integrated joint 1 is lifted up, the slip 4 clamps the oil pipe and drives the oil pipe to upwards move away from a wellhead along with the lifting of the sleeve-fishing integrated joint 1, so that the fishing work of the oil pipe under the well is realized.
The fishing mechanism comprises a fishing tool 5 and a plurality of slips 4, wherein the top end of the fishing tool 5 is connected with the bottom of the sleeve-fishing integrated joint 1, the outer wall of the fishing tool 5 is a conical surface with the diameter gradually shrinking upwards, the slips 4 are uniformly arranged on the outer wall of the fishing tool 5 along the circumferential direction, and the slips 4 can move up and down along the outer wall of the fishing tool 5. After the device stretches into the well downwards, the fishing tool 5 is inserted into the salvaged oil pipe downwards, at the moment, the slips 4 slide downwards under the action of self gravity and are in contact with the inner wall of the oil pipe, after sand washing work is finished, the upper bailing and fishing integrated joint 1 is arranged, at the moment, the slips 4 are subjected to the action of friction force of the inner wall of the oil pipe to move downwards along the outer wall of the fishing tool 5, at the moment, the inclined plane of the fishing tool 5 is matched with the inner wall of the oil pipe to gradually clamp the slips 4, the pressure borne by the slips 4 is gradually increased and the oil pipe is anchored, at the moment, the oil pipe needing to be salvaged by a target can be lifted out of a wellhead by continuing to lift the bailing and fishing integrated joint 1, and the salvaging work is realized. Under the general circumstances, the top of fishing tool 5 inserts the cover and drags for the bottom of integrative joint 1 and with the cover and drag for integrative joint 1 and pass through threaded connection, be convenient for carry out dismouting to fishing tool 5, before going on in work, need select the size to drag for integrative joint 1 with cover with the oil pipe internal diameter matched with fishing tool 5 that needs to be salvaged to be connected.
It should be noted that the bottom end of the outer wall of the fishing tool 5 is provided with a plurality of blocking key pins 8 along the circumferential direction. The stop key pin 8 plays a limiting role on the slips 4, when the slips 4 move downwards along the fishing tool 5, the slips 4 are in contact with the stop key pin 8, the stop key pin 8 organizes the slips 4 to move downwards continuously, the slips 4 are prevented from being separated from the fishing tool 5 downwards, the fishing work is failed, and the stability of the device is improved.
According to the invention, a displacement conversion mechanism is arranged in the sleeve-drag integrated joint 1, and the sand washing port 2 is blocked when the displacement conversion mechanism acts. When handling sand buries and blocks the brill accident, need carry out the sand washing work earlier after going into the well with the device and wash out the sand body in the pit and discharge and carry out the salvage work again and put forward the target oil pipe that waits to salvage, in the in-process of carrying out the salvage work, need wash the salvage instrument 5, prevent that the sand body in the pit from attaching on salvage instrument 5 after the sand washing work and leading to the device unable to carry out the salvage work, seal sand washing mouth 2 this moment, liquid can only be followed the cover and drag for the water downflow in integrative joint 1 and the salvage instrument 5 and wash out the salvage instrument 5, because sand washing mouth 2 shutoff, the liquid pressure that circulates through the water course increases, improve the scouring effect of sand washing mouth 2, if meet the stratum and continuously spit the circumstances, salvage instrument 5 can also carry out the sand washing work in step in the process of salvage work again after the sand washing work, improve the success rate of salvage work, simultaneously reduce the work degree of difficulty of salvage work, reduce work load.
The displacement conversion mechanism comprises a displacement conversion rod 3, the outer diameter of the displacement conversion rod 3 is matched with a water channel in the sleeve-drag integrated joint 1, and a through liquid passing hole is formed in the displacement conversion rod 3. The displacement conversion rod 3 and the sleeve are mutually independent between the joint 1, the displacement conversion rod 3 is not put into tools in the initial working stage, liquid flows out from the sand washing opening 2 to wash sand, the displacement conversion rod 3 is put into a tool string during fishing, the displacement conversion rod 3 falls into a water channel of the sleeve-fishing joint 1 and seals the sand washing opening 2 connected with the water channel, liquid pressure rises and continuously washes the underground through a through hole of the displacement conversion rod 3 by flowing out from the water channel of the fishing tool 5, and the fishing tool 5 can synchronously wash sand in the fishing process.
After the sand washing work is finished, the underground sand can be blocked in the oil pipe to influence the subsequent oil pipe salvaging work, and at the moment, after the displacement conversion rod 3 is put into the sleeve-salvaging integrated joint 1, the liquid pressure sprayed out of the water channel can be increased through the blocking sand washing port 2, so that sand washing is carried out in the oil pipe, smooth oil pipe salvaging work is ensured, and a salvaging tool is timely cleaned.
Meanwhile, when sand washing work is carried out, the situation that the inside and the outside of an oil pipe are blocked by sand bodies exists, at this time, due to the blocking of the sand bodies, the device cannot normally go into a well to carry out sand washing work, at this time, a displacement conversion rod 3 can be put into a sleeve-fishing integrated joint 1, after a sand washing port 2 is blocked by the displacement conversion rod 3, sand washing liquid only flows out from a water channel below, at this time, the pressure of the sand washing liquid sprayed out of the water channel rises, the sand bodies in the oil pipe can be effectively washed, and the sand bodies in the oil pipe are washed out, so that the device can smoothly go into the well to carry out sand washing work.
It should be noted that a mutually matched stepped structure is arranged between the outer wall of the displacement conversion rod 3 and the inner wall of the sleeve-drag integrated joint 1. The ladder structure is used for positioning the displacement conversion rod 3, after the displacement conversion rod 3 is put into along the tool string, the displacement conversion rod 3 stops moving and is fixed in the sleeve-fishing integrated joint 1 under the action of the ladder structure after the displacement conversion rod 3 moves down to the sleeve-fishing integrated joint 1 along the water channel, so that the sand flushing port 2 can not be blocked due to the fact that the displacement conversion rod 3 continuously descends along the water channel in the sleeve-fishing integrated joint 1, the sand flushing effect of a fishing tool on underground sand bodies is affected, and the stability of the device is improved.
The sleeve and drag integrated combined tool provided by the invention can perform sand washing and fishing without replacing tools, and can continuously perform sand washing work underground in the fishing process, so that high-efficiency sand washing and fishing are realized, and the device has the following specific operation processes:
Step one, selecting a fishing tool with proper size according to the working requirement and the plan, and determining the number of sand flushing barrels in the fishing barrel.
And step two, connecting the selected components to the tool string after being combined according to the device structure, and descending the tool string into the working position in the well. The milling head is positioned at the moment the upper end of the oil pipe fish roof.
And thirdly, injecting sand washing liquid into the sleeve-fishing integrated joint to perform sand washing. In the process, after the sand washing liquid flows into the water channel in the sleeve-fishing integrated joint, sand washing work is carried out in the well by flowing out from the water channel of the fishing tool and the sand washing opening on the outer wall of the sleeve-fishing integrated joint, sand in the well is washed out of the well, and the sand burying state of the oil pipe is relieved. Simultaneously, along with the sand body around being washed away by punching liquid, the cover cutter head moves downwards gradually until the fishing tool inserts oil pipe top.
And fourthly, lifting the bailing integrated joint to carry out the bailing work. After the lifting sleeve is lifted and fished into an integral joint, the fishing tool moves upwards along with the lifting sleeve and fished into an integral joint, the slips are contacted with the inner wall of the oil pipe and are subjected to the friction force of the oil pipe to move downwards along the outer wall of the fishing tool, the oil pipe and the fishing tool are matched to clamp the slips gradually to enable the slips to be anchored on the inner wall of the oil pipe, then the fishing tool drives the oil pipe to move upwards along with the lifting sleeve and fished into the integral joint to leave the wellhead to achieve fishing work, and meanwhile sand washing liquid can continuously flow into a well from a water channel of the fishing tool to wash sand in the well, so that the success rate of the fishing work is improved.
In the working process, when the condition that the fishing tool cannot be lowered due to the fact that the oil pipe is filled and buried by the sand body is met, the sand washing liquid pressure sprayed out of the water channel can be increased by throwing the displacement conversion rod, sand washing work is carried out in the oil pipe, and enough space is cleared for the device to be lowered into the oil pipe.
At this moment, the discharge capacity change-over rod falls into the cover and drags for the integrative joint and blocks up the sand washing mouth, and sand washing liquid can only flow from fishing tool's water course, and the pressure of sand washing liquid risees this moment makes the sand washing liquid that flows out from the water course have enough high pressure to wash the fishing tool, prevents that the sand body in the well from adhering to and influencing the going on of follow-up fishing work on fishing tool. Meanwhile, the high-pressure liquid can perform continuous sand washing work on the sand body in the oil pipe, so that the sand body is prevented from burying a fishing tool and cannot be fished.
It should be noted that the foregoing description is only a preferred embodiment of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood that modifications, equivalents, improvements and modifications to the technical solution described in the foregoing embodiments may occur to those skilled in the art, and all modifications, equivalents, and improvements are intended to be included within the spirit and principle of the present invention.
Claims (9)
1. The utility model provides a cover drags for integration combination tool which characterized in that includes:
The sand washing mechanism comprises a sleeve-fishing integrated joint (1) and a sand washing barrel, the top end of the sand washing barrel is connected to the bottom end of the sleeve-fishing integrated joint (1), the fishing mechanism penetrates into the sand washing barrel, the top end of the sand washing mechanism is connected to the bottom end of the sleeve-fishing integrated joint (1), a fishing tool is inserted into an oil pipe when the device goes down in a well, slips (4) are arranged on the fishing tool, the size of the fishing tool is matched with the inner diameter of the oil pipe to be fished, water channels which are axially communicated and correspond to the positions are arranged on the sleeve-fishing integrated joint (1) and the fishing mechanism, a plurality of sand washing ports (2) are formed in the side wall of the sleeve-fishing integrated joint (1), a displacement conversion mechanism is arranged in the sleeve-fishing integrated joint (1), the sand washing ports (2) are blocked when the displacement conversion mechanism acts, and the sleeve-fishing integrated joint (1), the fishing mechanism and the sand washing barrel are detachably connected.
2. The casing and fishing integrated combination tool according to claim 1, wherein the sand washing cylinder comprises a plurality of casing milling pipes (6) connected end to end, and a casing milling head (7) is arranged at the bottom end of the lowest casing milling pipe (6).
3. The sleeve-fishing integrated combination tool according to claim 1, wherein the lower end of the sand washing port (2) is positioned in the outer wall of the sleeve-fishing integrated joint (1) and vertically penetrates downwards, and the upper end of the sand washing port (2) is connected with a water channel inwards.
4. The sleeve and drag integrated combination tool according to claim 3, wherein the number of the sand flushing openings (2) is two, and the opening at the lower end of the sand flushing opening (2) is positioned in the sand flushing cylinder.
5. The sleeve-fishing integrated combined tool according to claim 1, wherein the fishing mechanism comprises a fishing tool (5) and a plurality of slips (4), the top end of the fishing tool (5) is connected with the bottom of the sleeve-fishing integrated joint (1), the outer wall of the fishing tool (5) is a conical surface with the diameter gradually shrinking upwards, the slips (4) are uniformly arranged on the outer wall of the fishing tool (5) along the circumferential direction, and the slips (4) can move up and down along the outer wall of the fishing tool (5).
6. The sleeve and drag integrated combination tool according to claim 5, wherein a blocking key pin (8) is arranged at the bottom end of the outer wall of the drag tool (5) along the circumferential direction.
7. The sleeve-fishing integrated combination tool according to claim 1, wherein the displacement conversion mechanism comprises a displacement conversion rod (3), the outer diameter of the displacement conversion rod (3) is matched with a water channel in the sleeve-fishing integrated joint (1), and a through liquid passing hole is formed in the displacement conversion rod (3).
8. The sleeve-fishing integrated combination tool according to claim 1, wherein a mutually matched step structure is arranged between the outer wall of the displacement conversion rod (3) and the inner wall of the sleeve-fishing integrated joint (1).
9. The sleeve and drag integrated combination tool according to claim 1, wherein the sleeve and drag integrated joint (1), the drag mechanism and the sand washing cylinder are connected through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411005461.8A CN121407868A (en) | 2024-07-25 | 2024-07-25 | Integrated combined tool is dragged for to cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411005461.8A CN121407868A (en) | 2024-07-25 | 2024-07-25 | Integrated combined tool is dragged for to cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN121407868A true CN121407868A (en) | 2026-01-27 |
Family
ID=98495806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411005461.8A Pending CN121407868A (en) | 2024-07-25 | 2024-07-25 | Integrated combined tool is dragged for to cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN121407868A (en) |
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2024
- 2024-07-25 CN CN202411005461.8A patent/CN121407868A/en active Pending
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