CN216341944U - Injection-production integrated tubular column of offshore thermal production electric submersible pump - Google Patents
Injection-production integrated tubular column of offshore thermal production electric submersible pump Download PDFInfo
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- CN216341944U CN216341944U CN202121770207.9U CN202121770207U CN216341944U CN 216341944 U CN216341944 U CN 216341944U CN 202121770207 U CN202121770207 U CN 202121770207U CN 216341944 U CN216341944 U CN 216341944U
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Abstract
The utility model discloses an injection-production integrated tubular column of an offshore thermal production electric submersible pump, which comprises a first aerogel heat-insulation oil pipe, a deep well safety valve, a thermal production packer, a second aerogel heat-insulation oil pipe, a common oil pipe and a guide shoe, which are sequentially connected from top to bottom; the integrated tubular column further comprises an electric submersible pump system, the electric submersible pump system is detachably arranged in the first aerogel heat insulation oil pipe and comprises a continuous oil pipe, a liquid/electric double-channel short section, a pump, a motor and a bottom plug-in connector which are sequentially connected from top to bottom; the integrated tubular column further comprises a high-temperature optical fiber, a first hydraulic control pipeline, a second hydraulic control pipeline, a small flat cable and a large flat cable; the first hydraulic control pipeline is used for controlling the air release valve. When the stratum needs to annotate steam, play out electric submersible pump system through coiled tubing, can realize annotating high-temperature steam, when annotating steam end needs the production of charge pump down, rethread coiled tubing puts into electric submersible pump system down, can realize annotating freely switching between adopting through the play of coiled tubing cable, convenient and fast.
Description
Technical Field
The utility model relates to an offshore heavy oil thermal recovery development oil extraction process, in particular to an offshore thermal recovery electric submersible pump injection-production integrated tubular column.
Background
The thick oil steam huff-puff thermal recovery is to continuously inject a certain amount of steam into one thick oil well in a short period, then soak the well for 5-7 days to diffuse the steam heat to a reservoir, then start a pump to open the well for production, and enter the next round of steam injection, soak and oil extraction after the instantaneous oil recovery amount or bottom hole flow temperature is reduced to a certain level, and the process is repeated for multiple rounds of periodic cycles, and the steam heat utilization rate determines the quality of the thermal recovery development effect.
The offshore oil field has small usable area and space and high temperature and pressure of steam huff-puff thermal recovery, an injection-production integrated mode which is completely suitable for offshore platform thickened oil steam huff-puff development does not exist at home and abroad at present, and offshore thermal recovery generally adopts an operation mode of separating an injection-heating pipe column from a production pipe column, namely: the heat injection pipe column is replaced by the platform workover before steam injection of the heavy oil well, and the production pipe column is replaced by the workover after the soaking blowout is finished, so that the mode has the defects that: firstly, well workover is carried out by washing and killing a well with cold fluid and tripping a tubular column, steam heat energy in a near-wellbore area is consumed by the cold fluid, the heat utilization rate is reduced, and the thermal recovery development effect is influenced; secondly, the drilling and workover rig occupies operation resources for a long time, and the reserve utilization of the platform heavy oil well is influenced; the offshore well workover operation cost is high, and the back-and-forth operation increases the offshore heavy oil development cost; and fourthly, the pipe string is pulled out and put down for a long time, the integrity of the platform heavy oil well casing is also influenced, and the safety development risk is brought. The integrated tubular column mode of 'pumping unit + heat insulation oil pipe + wear-resisting sucker rod + thick pump' is adopted to the land usually, but the sea space is limited, can't put the huge machine of knocking one's head of size, and the pole pipe corrodes the problem of eccentric wear and also can bring the safety risk. Therefore, a new low-cost and high-efficiency injection-production integrated mode suitable for offshore heavy oil thermal production development needs to be developed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides an injection-production integrated tubular column of an offshore thermal production electric submersible pump. The utility model relates to a low-cost high-efficiency steam injection and production transfer integrated device suitable for steam huff-puff development of a heavy oil well on an offshore platform, which is characterized in that a pipe column is frequently pulled out and pulled out in the steam huff-puff development of the heavy oil well on the offshore platform.
The technical scheme adopted by the utility model is as follows: an offshore thermal recovery electric submersible pump injection-production integrated pipe column is arranged in an original well casing, an oil casing annulus is formed between the integrated pipe column and the original well casing, and a thermal recovery well head is arranged on the original well casing;
the integrated pipe column comprises a first aerogel heat-insulation oil pipe, a deep well safety valve, a thermal recovery packer, a second aerogel heat-insulation oil pipe, a common oil pipe and a guide shoe which are sequentially connected from top to bottom; wherein the first aerogel heat insulation oil pipe is hung on the thermal recovery wellhead; the thermal recovery packer is set on the original well casing, and a gas release valve is arranged on one side of the thermal recovery packer; the second aerogel heat insulation oil pipe is connected with the common oil pipe through a Y joint; the common oil pipe and the guide shoe are positioned in the horizontal section of the original well casing, and a plurality of injection valves are arranged on the common oil pipe at intervals;
the integrated pipe column further comprises an electric submersible pump system, the electric submersible pump system is detachably arranged in the first aerogel heat insulation oil pipe and comprises a continuous oil pipe, a hydraulic/electric double-channel short section, a pump, a motor and a bottom plug-in connector which are sequentially connected from top to bottom; the bottom of the first aerogel heat insulation oil pipe is provided with a bearing shoulder which is used for being connected with the bottom in an inserting and matching mode, and the bottom inserting and the bearing shoulder are detachably connected with each other; a packer is arranged between the liquid/electric double-channel nipple and the first aerogel heat insulation oil pipe, a liquid outlet is arranged on a liquid outlet channel of the liquid/electric double-channel nipple, and the liquid outlet is positioned in an annular space between the coiled oil pipe and the first aerogel heat insulation oil pipe; the coiled tubing is hung on the thermal recovery wellhead;
the integrated tubular column further comprises a high-temperature optical fiber, a first hydraulic control pipeline, a second hydraulic control pipeline, a small flat cable and a large flat cable; the high-temperature optical fiber is arranged in the common oil pipe, one end of the high-temperature optical fiber is connected with the guide shoe, the other end of the high-temperature optical fiber penetrates through the Y joint and then enters an oil sleeve annulus, and the high-temperature optical fiber is connected with a ground system after sequentially penetrating through the thermal recovery packer and the thermal recovery wellhead; the first hydraulic control pipeline is used for controlling the air release valve, one end of the first hydraulic control pipeline is connected with the air release valve, and the other end of the first hydraulic control pipeline penetrates through the thermal recovery wellhead to be connected with a ground control system; the second hydraulic control pipeline is used for controlling the deep well safety valve, one end of the second hydraulic control pipeline is connected with the deep well safety valve, and the other end of the second hydraulic control pipeline penetrates through the thermal recovery wellhead to be connected with the ground control system; one end of the small flat cable is connected with the motor, and the other end of the small flat cable extends into a power transmission channel of the liquid/electric double-channel short section; the large flat cable is arranged in the continuous oil pipe, one end of the large flat cable extends into a power transmission channel of the liquid/electric double-channel short section to be connected with the small flat cable, and the other end of the large flat cable penetrates through the thermal recovery wellhead to be connected with a ground power control system.
Furthermore, the upper end of the deep well safety valve is connected with a first heat insulation short section, and the first heat insulation short section is connected with the first aerogel heat insulation oil pipe through a heat insulation buckle; the lower end of the deep well safety valve is connected with a second heat insulation short section, and the second heat insulation short section is connected with the thermal recovery packer.
Furthermore, a coiled tubing joint is arranged on the liquid/electric double-channel short section, and the liquid/electric double-channel short section is connected with the coiled tubing through the coiled tubing joint.
Further, the diameter of first aerogel thermal-insulated oil pipe is 7 inches, the diameter of second aerogel thermal-insulated oil pipe is 4.5 inches.
Furthermore, the guide shoe adopts a guide shoe with a chamfer and an inclined opening.
Further, the first pilot line and the second pilot line were each 1/4 inches in diameter.
Furthermore, the thermal recovery packer, the air release valve and the deep well safety valve can resist the temperature of 350 ℃ and the pressure of 21 MPa.
The utility model has the beneficial effects that: the utility model provides a brand-new heat injection and production conversion integrated tubular column mode, improves the heat energy utilization rate, the operation efficiency and the production time rate, can realize full-well-bore full-time-domain high-temperature and high-pressure parameter monitoring, and provides data support for the dynamic adjustment of the thermal recovery of the thick oil.
Drawings
FIG. 1: the utility model relates to a schematic diagram of the integral structure of an injection-production integrated tubular column of an offshore thermal production electric submersible pump;
FIG. 2: the utility model relates to a high-temperature steam injection working condition implementation state diagram;
FIG. 3: the utility model relates to a high-temperature well fluid blowout working condition implementation state diagram;
FIG. 4: the utility model relates to an electric submersible pump production working condition implementation state diagram.
The attached drawings are marked as follows:
1-guide shoe; 2-common oil pipe;
3-high temperature optical fiber; 4-dispensing valve;
5-Y linker; 6-second aerogel heat insulation oil pipe;
7-thermal production packer; 8-air release valve;
9-second insulating short section; 10-deep well safety valve;
11-first insulating sub; 12-heat insulation buckle changing;
13-load bearing shoulder; 14-first aerogel insulation tubing;
15-first pilot line; 16-a second pilot line;
17-liquid/electric double channel nipple; 18-small flat cable;
19-coiled tubing joint; 20-a liquid outlet;
21-large flat cable; 22-original well casing;
23-bottom grafting; 24-an electric motor;
25-a pump; 26-packer;
27-coiled tubing; 28-high temperature steam;
29-high purity nitrogen; 30-casing gas;
31-blowout well fluid; 32-formation fluid.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in the attached drawings 1 to 4, an offshore thermal recovery electric submersible pump injection-production integrated pipe column is arranged in an original well casing 22, an oil casing annulus is formed between the integrated pipe column and the original well casing 22, and a thermal recovery wellhead is installed on the original well casing 22.
The integrated tubular column comprises a first aerogel heat insulation oil pipe 14, a first heat insulation short section 11, a deep well safety valve 10, a second heat insulation short section 9, a thermal recovery packer 7, a second aerogel heat insulation oil pipe 6, a common oil pipe 2 and a guide shoe 1 which are sequentially connected from top to bottom. The first aerogel heat insulation oil pipe 14 is hung on the thermal recovery wellhead, and the diameter of the first aerogel heat insulation oil pipe 14 is 7 inches. The first thermal insulation short joint 11 is connected with the first aerogel thermal insulation oil pipe 14 through a thermal insulation buckle 12. The thermal production packer 7 is set on the original well casing 22, and a deflation valve 8 is arranged on one side of the thermal production packer 7. The second aerogel heat insulation oil pipe 6 is connected with the common oil pipe 2 through a Y joint 5, and the diameter of the second aerogel heat insulation oil pipe 6 is 4.5 inches. The common oil pipe 2 and the guide shoe 1 are positioned in the horizontal section of the original well casing 22, and a plurality of injection valves 4 are uniformly arranged on the common oil pipe 2 at equal intervals; the guide shoe 1 is a guide shoe with a chamfer and an oblique opening. Wherein the thermal recovery packer 7, the air release valve 8 and the deep well safety valve 10 are resistant to 350 ℃ and 21 MPa.
The integrated tubular column further comprises an electric submersible pump system, wherein the electric submersible pump system is detachably arranged in the first aerogel heat insulation oil pipe 14 and comprises a continuous oil pipe 27, a liquid/electric double-channel short section 17, a pump 25, a motor 24 and a bottom inserting connection 23 which are sequentially connected from top to bottom. The bottom of the first aerogel heat insulation oil pipe 14 is provided with a bearing shoulder 13 which is used for being matched and connected with the bottom plug 23, and the bottom plug 23 and the bearing shoulder 13 are detachably connected with each other. Liquid/electricity binary channels nipple 17 with be provided with packer 26 between the thermal-insulated oil pipe 14 of first aerogel, be provided with liquid outlet 20 and coiled tubing joint 19 on the liquid/electricity binary channels nipple 17, liquid outlet 20 sets up on the liquid outlet channel of liquid/electricity binary channels nipple 17, and be located in the annular space between coiled tubing 27 and the thermal-insulated oil pipe 14 of first aerogel. The coiled tubing 27 is hung on the thermal production wellhead, and the coiled tubing 27 is connected with the liquid/electric double-channel short joint 17 through the coiled tubing joint 19.
The integrated tubular column further comprises a high-temperature optical fiber 3, a first hydraulic control pipeline 15, a second hydraulic control pipeline 16, a small flat cable 18 and a large flat cable 21. The high-temperature optical fiber 3 is arranged in the common oil pipe 2, one end of the high-temperature optical fiber 3 is connected with the guide shoe 1, the other end of the high-temperature optical fiber penetrates through the Y-shaped joint 5 and then enters an oil sleeve annulus, and the high-temperature optical fiber is connected with a ground system after sequentially penetrating through the thermal recovery packer 7 and the thermal recovery wellhead. The first hydraulic control pipeline 15 is used for controlling the air release valve 8, one end of the first hydraulic control pipeline 15 is connected with the air release valve 8, and the other end of the first hydraulic control pipeline passes through the thermal recovery wellhead and is connected with a ground control system. The second hydraulic control pipeline 16 is used for controlling the deep well safety valve 10, one end of the second hydraulic control pipeline 16 is connected with the deep well safety valve 10, and the other end of the second hydraulic control pipeline passes through the thermal recovery wellhead to be connected with the ground control system. One end of the small flat cable 18 is connected with the motor 24, and the other end of the small flat cable extends into a power transmission channel of the liquid/electric double-channel short section 17. The large flat cable 21 is arranged in the coiled tubing 27, one end of the large flat cable 21 extends into the power transmission channel of the liquid/electric double-channel short section 17 to be connected with the small flat cable 18, and the other end of the large flat cable passes through the thermal recovery wellhead to be connected with a ground power control system. Wherein the first pilot control line 15 and the second pilot control line 16 are both 1/4 inches in diameter.
When the stratum needs to annotate steam, play out the electric submersible pump system through coiled tubing 27, can realize annotating high temperature steam 28, when annotating steam end needs the production of charge pump down, rethread coiled tubing 27 goes into the electric submersible pump system down, can realize annotating freely switching between adopting through the play of coiled tubing cable, convenient and fast.
When the offshore thermal recovery electric submersible pump injection-production integrated pipe column is used, as shown in figure 1, the connected integrated pipe column is put into a production sleeve, and an electric pump is started on the ground to normally produce.
As shown in fig. 2, when the production of the heavy oil well is difficult and steam injection needs to be carried out, the ground control system closes the deep well safety valve 10 and the air release valve 8 to prevent the swabbing phenomenon and the wash-and-kill well from polluting the stratum during pipe string pulling, and after the electric submersible pump system in the first aerogel heat insulation oil pipe 14 is pulled out through the ground device of the coiled tubing 27, the ground control system pressurizes and opens the deep well safety valve 10 and the air release valve 8, and at the moment, a steam injection channel and a circular empty nitrogen injection channel are established. The high-temperature steam 28 enters the stratum after passing through the thermal recovery well mouth, the first aerogel heat insulation oil pipe 14, the deep well safety valve 10, the thermal recovery packer 7, the second aerogel heat insulation oil pipe 6, the Y joint 5, the common oil pipe 2 and the injection allocation valve 4, and the high-purity nitrogen 29 enters the stratum after passing through the thermal recovery well mouth, the oil sleeve annulus and the air release valve 8, so that the injection working condition of the high-temperature steam 28 is realized.
As shown in fig. 3, after the steam injection and the shut-in are finished, the blowout operation of the heavy oil well needs to be performed, after the ground blowout flow is confirmed, the oil pressure is firstly released, and the blowout well fluid 31 enters the ground blowout pipeline through the injection valve 4, the common oil pipe 2, the Y joint 5, the second aerogel heat insulation oil pipe 6, the thermal recovery packer 7, the deep well safety valve 10, the first aerogel heat insulation oil pipe 14 and the thermal recovery wellhead. When the oil pressure is released, sleeve pressure is released again, and sleeve gas 30 enters a ground blowout flow after passing through a gas release valve 8, an oil sleeve annulus and a thermal production wellhead, so that the blowout working condition of high-temperature well fluid is realized.
As shown in fig. 4, when the heavy oil well needs to be produced after blowout, the coiled tubing 27 is lowered into the designed well depth by the ground device of the coiled tubing 27, the electric submersible pump system in the first aerogel heat insulation oil pipe 14 is started to produce by the ground electric pump control cabinet, the formation fluid 32 enters the formation production flow after passing through the injection valve 4, the common oil pipe 2, the Y joint 5, the second aerogel heat insulation oil pipe 6, the thermal production packer 7, the deep well safety valve 10, the pump 25, the liquid outlet 20 on the liquid/electric double-channel nipple 17, the annulus between the coiled tubing 27 and the first aerogel heat insulation oil pipe 14, and the thermal production wellhead, and the production working condition of the electric submersible pump after steam injection is realized.
The working principle of the injection-production integrated pipe column of the offshore thermal production electric submersible pump is as follows:
when the heavy oil well needs steam injection operation, an electric submersible pump system in the first aerogel heat insulation oil pipe 14 is lifted through a coiled tubing cable ground device, a ground hydraulic control system opens the deep well safety valve 10 and the air release valve 8, then a steam injection and nitrogen injection channel is established, high-temperature steam 28 enters the stratum through the first aerogel heat insulation oil pipe 14, and high-purity nitrogen 29 enters the stratum through the annular space of the first aerogel heat insulation oil pipe 14 and the original well casing 22. When the heavy oil well needs to be pumped down for production, the coiled tubing cable ground device enables the electric submersible pump system in the first aerogel heat insulation oil pipe 14 to be driven into the designed well depth, and the electric pump production is started through the ground electric pump control cabinet.
According to the utility model, free switching of injection and production is realized through a continuous pipe cable pulling mode, the influence of well deviation is avoided, cold damage of the working fluid to the stratum during frequent workover operation can be avoided, and the heat utilization rate and the thermal production development effect are improved.
Meanwhile, the injection-production integrated tubular column of the offshore thermal production electric submersible pump is provided with a full-shaft high-temperature optical fiber 3 testing function, so that the conditions of the steam injection full-shaft and the liquid production profile of the horizontal section in the production stage can be mastered in real time.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (7)
1. An offshore thermal recovery electric submersible pump injection-production integrated pipe column is characterized in that the integrated pipe column is arranged in a raw well casing (22), an oil casing annulus is formed between the integrated pipe column and the raw well casing (22), and a thermal recovery wellhead is installed on the raw well casing (22);
the integrated pipe column comprises a first aerogel heat-insulation oil pipe (14), a deep well safety valve (10), a thermal recovery packer (7), a second aerogel heat-insulation oil pipe (6), a common oil pipe (2) and a guide shoe (1) which are sequentially connected from top to bottom; wherein the first aerogel thermal insulation tubing (14) is suspended on the thermal recovery wellhead; the thermal production packer (7) is set on the original well casing pipe (22), and a deflation valve (8) is arranged on one side of the thermal production packer (7); the second aerogel heat insulation oil pipe (6) is connected with the common oil pipe (2) through a Y joint (5); the common oil pipe (2) and the guide shoe (1) are positioned in the horizontal section of the original well casing (22), and a plurality of injection valves (4) are arranged on the common oil pipe (2) at intervals;
the integrated pipe column further comprises an electric submersible pump system, the electric submersible pump system is detachably arranged in the first aerogel heat insulation oil pipe (14) and comprises a continuous oil pipe (27), a liquid/electric double-channel short section (17), a pump (25), a motor (24) and a bottom plug-in connector (23), which are sequentially connected from top to bottom; the bottom of the first aerogel heat insulation oil pipe (14) is provided with a bearing shoulder (13) which is used for being in matched connection with the bottom plug-in connection (23), and the bottom plug-in connection (23) and the bearing shoulder (13) are detachably connected with each other; a packer (26) is arranged between the liquid/electric double-channel short section (17) and the first aerogel heat insulation oil pipe (14), a liquid outlet (20) is arranged on a liquid outlet channel of the liquid/electric double-channel short section (17), and the liquid outlet (20) is positioned in an annular space between the coiled tubing (27) and the first aerogel heat insulation oil pipe (14); the coiled tubing (27) is hung on the thermal recovery wellhead;
the integrated pipe column further comprises a high-temperature optical fiber (3), a first hydraulic control pipeline (15), a second hydraulic control pipeline (16), a small flat cable (18) and a large flat cable (21); the high-temperature optical fiber (3) is arranged in the common oil pipe (2), one end of the high-temperature optical fiber (3) is connected with the guide shoe (1), the other end of the high-temperature optical fiber penetrates through the Y joint (5) and then enters an oil sleeve annulus, and the high-temperature optical fiber is connected with a ground system after sequentially penetrating through the thermal recovery packer (7) and the thermal recovery wellhead; the first hydraulic control pipeline (15) is used for controlling the air release valve (8), one end of the first hydraulic control pipeline (15) is connected with the air release valve (8), and the other end of the first hydraulic control pipeline penetrates through the thermal recovery wellhead to be connected with a ground control system; the second hydraulic control pipeline (16) is used for controlling the deep well safety valve (10), one end of the second hydraulic control pipeline (16) is connected with the deep well safety valve (10), and the other end of the second hydraulic control pipeline penetrates through the thermal recovery wellhead to be connected with the ground control system; one end of the small flat cable (18) is connected with the motor (24), and the other end of the small flat cable extends into a power transmission channel of the liquid/electric double-channel short section (17); the large flat cable (21) is arranged in the coiled tubing (27), one end of the large flat cable (21) extends into a power transmission channel of the liquid/electric double-channel short section (17) to be connected with the small flat cable (18), and the other end of the large flat cable penetrates through the thermal recovery wellhead to be connected with a ground power control system.
2. The offshore thermal recovery electric submersible pump injection-production integrated tubular column according to claim 1, characterized in that a first heat insulation short joint (11) is connected to the upper end of the deep well safety valve (10), and the first heat insulation short joint (11) is connected with the first aerogel heat insulation oil pipe (14) through a heat insulation buckle (12); the lower end of the deep well safety valve (10) is connected with a second heat insulation short section (9), and the second heat insulation short section (9) is connected with the thermal recovery packer (7).
3. The offshore thermal production electric submersible pump injection-production integrated pipe string according to claim 1, characterized in that a coiled tubing joint (19) is arranged on the hydraulic/electric dual-channel nipple (17), and the hydraulic/electric dual-channel nipple (17) is connected with the coiled tubing (27) through the coiled tubing joint (19).
4. The offshore thermal production electric submersible pump injection-production integrated tubular string of claim 1, wherein the first aerogel heat insulation oil pipe (14) has a diameter of 7 inches and the second aerogel heat insulation oil pipe (6) has a diameter of 4.5 inches.
5. The offshore thermal production electric submersible pump injection-production integrated pipe column according to claim 1, wherein the guide shoe (1) is a chamfered and beveled guide shoe.
6. The offshore thermal production electric submersible pump injection-production integrated string according to claim 1, wherein the first hydraulic control line (15) and the second hydraulic control line (16) are each 1/4 inches in diameter.
7. The offshore thermal recovery electric submersible pump injection-production integrated pipe column according to claim 1, wherein the thermal recovery packer (7), the air release valve (8) and the deep well safety valve (10) are resistant to temperature of 350 ℃ and pressure of 21 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770207.9U CN216341944U (en) | 2021-07-30 | 2021-07-30 | Injection-production integrated tubular column of offshore thermal production electric submersible pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770207.9U CN216341944U (en) | 2021-07-30 | 2021-07-30 | Injection-production integrated tubular column of offshore thermal production electric submersible pump |
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| Publication Number | Publication Date |
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| CN216341944U true CN216341944U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121770207.9U Active CN216341944U (en) | 2021-07-30 | 2021-07-30 | Injection-production integrated tubular column of offshore thermal production electric submersible pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN216341944U (en) |
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2021
- 2021-07-30 CN CN202121770207.9U patent/CN216341944U/en active Active
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