CN219387854U - Offshore oil well hot water circulation wellhead traversing device - Google Patents
Offshore oil well hot water circulation wellhead traversing device Download PDFInfo
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- CN219387854U CN219387854U CN202320206946.8U CN202320206946U CN219387854U CN 219387854 U CN219387854 U CN 219387854U CN 202320206946 U CN202320206946 U CN 202320206946U CN 219387854 U CN219387854 U CN 219387854U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The utility model relates to the technical field of offshore oil exploitation, in particular to a wellhead traversing device for hot water circulation of an offshore oil well. The well head well fluid circulating device comprises an upper flange, an oil pipe four-way joint, a water heater, a first hot water pipe, a first water return pipe, a four-way joint, a crossing pipe, an oil pipe hanger, an adapter, a circulating pipe hanger, a circulating pipe and an oil pipe joint which are sequentially connected, wherein a second well fluid channel is arranged on the oil pipe hanger, and the crossing pipe is connected with the adapter in a well head through a first crossing hole on the upper flange and a second crossing hole on the oil pipe hanger. The utility model realizes the installation of the hot water circulation device on the premise of not changing the original wellhead structure, ensures enough well liquid flow channels through the well liquid channels, optimizes the structure, is easy to install, reduces the installation difficulty and has higher reliability.
Description
Technical Field
The utility model relates to the technical field of offshore oil exploitation, in particular to a wellhead traversing device for hot water circulation of an offshore oil well.
Background
The well bore or stratum needs to be heated in the production process of the offshore oil well, and the hot water circulation heating process in the well bore is a safe, efficient, energy-saving and environment-friendly measure.
Because the requirements on safety and environmental protection of offshore oil wells are high, the wellhead structure is complex, and the realization of hot water circulation is a great difficulty under the condition of not changing the original wellhead structure.
The patent CN215213469U proposes a hot water circulation viscosity-reducing paraffin-preventing wellhead device for offshore oil fields, which adopts hot water to pass through an inner hole of a hanger from a water inlet pipe to an inner circulation pipe, to pass through an annular space between the inner pipe and an inner pipe of the inner circulation pipe at the bottom of a well and return to the inner pipe and the outer pipe, and completes heat exchange.
However, the above patent still has many defects, and it is difficult to meet the actual production needs, such as:
(1) because the upper flange channel is limited, the flow channel between the circulating pipe hanger and the upper flange is reduced, so that the back pressure of the wellhead is increased to influence the production, and the wellhead is not provided with a well flow channel in the patent, if the inner hole is enlarged, the wellhead structure is necessarily changed, the cost is increased, and potential safety hazards exist.
(2) The tubing hanger is positioned at the upper end of the tubing hanger and is positioned in the upper flange channel, which is difficult to implement due to insufficient height during the implementation process.
(3) In the installation process, the height of the upper flange is uncertain (generally has 0-5mm error) due to the matching error of the steel ring groove and the steel ring, so that the holes on the hanger and the holes on the upper flange of the inner circulating pipe are difficult to center in the circumferential direction and the height direction.
(4) And a water inlet and a water outlet are formed in the upper flange, so that the processing cost is increased, and the original wellhead structure is changed.
(5) The implementation of the above scheme actually changes the upper flange structure (at least two access holes are to be processed).
Disclosure of Invention
The utility model aims at overcoming the defects in the prior art, provides a hot water circulation wellhead traversing device for an offshore oil well, is particularly suitable for a stage of changing a development well into a water injection well in a later exploitation process, realizes the installation of the hot water circulation device on the premise of not changing the original wellhead structure, and is convenient to install and operate.
The technical scheme is as follows:
the offshore oil well hot water circulation wellhead traversing device comprises a first hot water pipe, a first return pipe, an oil pipe hanger, a traversing pipe, an adapter, a circulating pipe hanger and a circulating pipe, wherein a second well liquid channel is arranged on the oil pipe hanger; the tubing hanger is also provided with a second traversing hole for accommodating the traversing tube to pass through, and the second traversing hole is positioned beside the second well fluid channel; the traversing pipe passes through the second traversing hole along the well fluid direction to be connected with the adapter, and the lower part of the adapter is sequentially connected with the circulating pipe hanger and the circulating pipe; the adapter is provided with a third well liquid channel, a first hot water channel and a first backwater channel, and the circulating pipe hanger is provided with a fourth well liquid channel, a second hot water channel and a second backwater channel; the second well liquid channel is sequentially communicated with the third well liquid channel and the fourth well liquid channel, the first hot water pipe is sequentially communicated with the first hot water flow channel, the second hot water flow channel and the circulating pipe through the penetrating pipe, and the first water return pipe is sequentially communicated with the first water return flow channel, the second water return flow channel and the circulating pipe through the penetrating pipe.
Or the following scheme:
the offshore oil well hot water circulation wellhead penetrating device comprises an upper flange, an oil pipe four-way joint, a first hot water pipe, a first water return pipe and an oil pipe hanger, wherein a second well liquid channel is arranged on the oil pipe hanger, the upper flange is provided with a first well liquid channel and a first penetrating hole, and the first penetrating hole is positioned beside the first well liquid channel; the lower part of the upper flange is connected with an oil pipe hanger and an oil pipe four-way, and the first well fluid channel is communicated with the second well fluid channel and also comprises a traversing pipe, an adapter, a circulating pipe hanger and a circulating pipe; the tubing hanger is also provided with a second traversing hole for accommodating the traversing tube to pass through, and the second traversing hole is positioned beside the second well fluid channel; the traversing pipe passes through the second traversing hole along the well fluid direction to be connected with the adapter, and the lower part of the adapter is sequentially connected with the circulating pipe hanger and the circulating pipe; the adapter is provided with a third well liquid channel, a first hot water channel and a first backwater channel, and the circulating pipe hanger is provided with a fourth well liquid channel, a second hot water channel and a second backwater channel; the second well liquid channel is sequentially communicated with the third well liquid channel and the fourth well liquid channel, the first hot water pipe is sequentially communicated with the first hot water flow channel, the second hot water flow channel and the circulating pipe through the penetrating pipe, and the first water return pipe is sequentially communicated with the first water return flow channel, the second water return flow channel and the circulating pipe through the penetrating pipe.
Furthermore, the penetrating pipe and the circulating pipe are of sleeve structures and are formed by sleeving an outer pipe on an inner pipe, an annulus is reserved between the inner pipe and the outer pipe, the inner pipe and the outer pipe of the penetrating pipe are respectively a second hot water pipe and a second water return pipe, and the inner pipe and the outer pipe of the circulating pipe are respectively a third hot water pipe and a third water return pipe.
Further, the adapter is provided with a second step hole, a third step hole and two second side holes; the small hole of the second step hole is communicated with one of the second side holes to form a first hot water flow passage, and the large hole of the second step hole is communicated with the other second side hole to form a first return water flow passage; the third step hole is a third well liquid channel.
Further, the circulating pipe hanger is also provided with a fourth step hole and two third side holes; the big hole of the fourth step hole is communicated with one of the third side holes to form a second hot water flow passage, and the small hole of the fourth step hole is communicated with the other third side hole to form a second return water flow passage.
Further, the water heater also comprises a heater and a four-way joint, wherein the heater is provided with a first hot water pipe and a first water return pipe, the four-way joint is provided with a first step hole and two first side holes, and the big hole and the small hole of the first step hole are respectively communicated with the two first side holes; the first hot water pipe is sequentially communicated with one of the first side hole, the small hole of the first step hole and the second hot water pipe, and the first water return pipe is sequentially communicated with the other of the first side hole, the large hole of the first step hole and the second water return pipe.
Furthermore, the upper end of the circulating pipe hanger is inserted into the third step hole, the outer wall of the upper end of the circulating pipe hanger is provided with a first limit step, and the limit step is in limit fit with the third step hole.
Further, the oil pipe connector is further included, and the oil pipe connector is connected below the adapter connector in a threaded mode.
Further, the upper end of the oil pipe joint is provided with a second limiting step, and the second limiting step is in limiting fit with the lower end of the circulating pipe hanger.
Further, the fourth well liquid channel is a plurality of through holes or through grooves uniformly distributed around the third step hole.
The beneficial effects of the utility model are as follows:
the utility model realizes the installation of the hot water circulation device on the premise of not changing the original wellhead structure, ensures enough well liquid flow channels through the well liquid channels, optimizes the structure, is easy to install, reduces the installation difficulty and has higher reliability.
Drawings
FIG. 1 is a schematic overall construction;
FIG. 2 is a schematic illustration of a fourth well fluid passage in the form of a notch-shaped circulation tube hanger;
FIG. 3 is a schematic elevational view of a fourth well fluid passage in the form of a notch of the circulation tube hanger;
FIG. 4 is a schematic cross-sectional view of the structure at A-A in FIG. 3;
FIG. 5 is a schematic view of a fourth fluid passage in the form of an array of circular holes in the tubing hanger;
FIG. 6 is a schematic elevational view of a fourth fluid passage in the form of an array of circular holes in the tubing hanger;
FIG. 7 is a schematic cross-sectional view of the structure at B-B in FIG. 6;
in the figure:
1. the device comprises a first hot water pipe, 2, a first return pipe, 3, an oil pipe hanger, 4, a crossing pipe, 5, a conversion joint, 6, a circulating pipe hanger, 7, a circulating pipe, 8, an upper flange, 9, an oil pipe four-way, 10, a four-way joint, 11, an oil pipe joint, 12, a heater, 31, a second well liquid channel, 32, a second crossing hole, 51, a third stepped hole, 52, a second stepped hole, 53, a second side hole, 61, a fourth stepped hole, 62, a third side hole, 63, a first limiting step, 64, a fourth well liquid channel, 81, a first well liquid channel, 82, a first crossing hole, 101, a first stepped hole, 102, a first side hole, 111 and a second limiting step.
Detailed Description
The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.
Referring to fig. 1, a wellhead traversing device for hot water circulation of an offshore oil well comprises a heater 12, a four-way joint 10, a traversing pipe 4, an adapter 5, a circulating pipe hanger 6, a circulating pipe 7, an oil pipe joint 11, an upper flange 8, an oil pipe four-way joint 9 and an oil pipe.
The upper flange 8 is an original part of a wellhead in a well period, and is provided with a first through hole 82 and a first well fluid channel 81, wherein the first through hole 82 is originally used for threading a cable; the upper flange 8 is connected with an oil pipe four-way 9 through bolts.
The tubing hanger 3 is provided with a second well fluid channel 31 and a second through hole 32, and the second through hole 32 is located beside the second well fluid channel 31.
The heater 12 is connected to the first hot water pipe 1 and the first return pipe 2, and is connected to the four-way joint 10 through the first hot water pipe 1 and the first return pipe 2.
The four-way joint 10 is provided with a first step hole 101 and two first side holes 102, wherein the small hole of the first step hole 101 is positioned above the large hole, the corresponding two first side holes 102 are arranged one above the other, and the two first side holes 102 are respectively communicated with the large hole and the small hole of the first step hole 101; the first hot water pipe 1 is connected with a first side hole 102 above, the first return pipe 2 is connected with a first side hole 102 below, and the lower ends of the large hole and the small hole of the first step hole 101 are connected with the upper end of the traversing pipe 4.
The lower end of the crossing pipe 4 sequentially passes through the first crossing hole 82 and the second crossing hole 32 to be connected with the upper end of the conversion joint 5; the penetrating pipe 4 and the circulating pipe 7 are of sleeve structures and are formed by sleeving an outer pipe on an inner pipe, and an annulus is reserved between the inner pipe and the outer pipe, wherein the inner pipe and the outer pipe of the penetrating pipe 4 are respectively a second hot water pipe and a second return water pipe, and the inner pipe and the outer pipe of the circulating pipe 7 are respectively a third hot water pipe and a third return water pipe; the upper end of the second hot water pipe is connected with the lower end of the small hole of the first step hole 101, and the upper end of the second water return pipe is connected with the lower end of the large hole of the first step hole 101.
The adapter 5 is provided with a second step hole 52, a third step hole 51 and two second side holes 53, wherein the big hole of the second step hole 52 is positioned above the small hole, the big hole of the third step hole 51 is positioned below the small hole, the two corresponding second side holes 53 are also arranged up and down, one end of each second side hole 53 is respectively communicated with the big hole and the small hole of the second step hole 52, and the other end is communicated with the big hole of the third step hole 51; the upper end of the large hole of the second step hole 52 is connected with the lower end of the outer pipe of the crossing pipe 4, and the upper end of the small hole is connected with the lower end of the inner pipe of the crossing pipe 4.
The circulating pipe hanger 6 is provided with a fourth step hole 61, two third side holes 62, a first limiting step 63 and a fourth well fluid channel 64; the circulating pipe hanger 6 is divided into an upper section and a lower section, a first limiting step 63 is arranged between the upper section and the lower section, the diameter of the upper section is smaller than the diameters of the lower section and the small hole of the third step hole 51, the upper section is inserted into the small hole of the third step hole 51 and is in clearance fit with the inner wall of the small hole of the third step hole 51, the lower section is inserted into the large hole of the third step hole 51 and is in clearance fit with the inner wall of the large hole of the third step hole 51, the first limiting step 63 is in limit fit with the lower end of the small hole of the third step hole 51, upward movement of the circulating pipe hanger 6 is prevented, and the width of the annulus is larger than that of the fourth well liquid channel 64; the fourth step hole 61 and the fourth well fluid channel 64 are both arranged at the lower section; the large hole of the fourth step hole 61 is positioned below the small hole, two corresponding third side holes 62 are also arranged up and down, one end of each of the two third side holes 62 is respectively communicated with the large hole and the small hole of the fourth step hole 61, the other end of each of the two third side holes is respectively provided with a ring groove, sealing grooves are respectively arranged above and below the ring grooves, the two third side holes 62 are respectively connected with the two second side holes 53 through the ring grooves and the sealing rings, the upper third side hole 62 is connected with the upper second side hole 53, and the lower third side hole 62 is connected with the lower second side hole 53; the fourth well fluid channel 64 is circumferentially arranged outside the fourth step hole 61 and the third side hole 62; the lower end of the small hole of the fourth step hole 61 is connected with the upper end of the inner pipe of the circulating pipe 7, and the lower end of the large hole of the fourth step hole 61 is connected with the upper end of the outer pipe of the circulating pipe 7.
An annulus is reserved between the inner wall of the lower end of the adapter 5 and the outer wall of the lower end of the circulating pipe hanger 6, the lower end of the adapter 5 is connected with an oil pipe joint 11 through internal threads, the upper end of the oil pipe joint 11 is inserted into the annulus, the inner wall of the upper end of the oil pipe joint 11 is provided with a second limiting step 111, the second limiting step 111 is in limiting fit with the lower end of the circulating pipe hanger 6, the circulating pipe hanger 6 is prevented from moving downwards, and the position of the circulating pipe hanger 6 is fixed together with the first limiting step 63.
And an oil pipe is connected below the oil pipe joint 11.
In the present embodiment, the first through hole 82, the second through hole 32, the first side hole 102, the first step hole 101, the second step hole 52, the second side hole 53, the third step hole 51 and the fourth step hole 61 are circular holes
Referring to fig. 2 to 7, the third side holes 62 may also be straight-slot-shaped, and the cross sections of the inlets of the two third side holes 62 are respectively larger than the cross section of the second side hole 53 connected with the two third side holes 62, and the ring grooves are respectively sealed by sealing grooves and sealing rings between the two third side holes 62 and above and below, so that the connection between the second side hole 53 and the third side hole 62 is realized, and meanwhile, the sealing connection can be realized without accurate alignment.
The fourth well fluid passages 64 are uniformly distributed around the third stepped hole 51 and the third side hole 62 in the shape of a circular hole, a circular hole array or a notch, and preferably in the shape of a circular hole array or a notch, so as to provide a larger well fluid flow area.
The working principle of the utility model is as follows:
the high-temperature hot water heated by the heater 12 sequentially passes through the first hot water pipe 1, the four-way joint 10 (the upper first side hole 102, the small hole of the first step hole 101), the inner pipe passing through the pipe 4, the adapter 5 (the small hole of the second step hole 52, the lower second side hole 53, the large hole of the third step hole 51), the circulation pipe hanger 6 (the lower third side hole 62, the large hole of the fourth step hole 61) and the outer pipe of the circulation pipe 7 to reach the bottom end of the circulation pipe 7; then, the heat exchange cycle is completed by passing through the inner pipe of the circulation pipe 7, the circulation pipe hanger 6 (small hole of the fourth step hole 61, upper third side hole 62), the adapter 5 (large hole of the third step hole 51, upper second side hole 53, large hole of the second step hole 52), the outer pipe of the passing pipe 4, the four-way adapter 10 (large hole of the first step hole 101, lower first side hole 102) and the first return pipe 2 in this order from the bottom end of the circulation pipe 7, and flowing back to the heater 12.
The above embodiments have shown the core idea of the present utility model, and the accompanying drawings are only schematic, and for some technical details, those skilled in the art can adapt to the technical knowledge according to the inventive idea of the present utility model and the technical knowledge in the art, without affecting the implementation of the present utility model.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (10)
1. The offshore oil well hot water circulation wellhead traversing device comprises a first hot water pipe (1), a first water return pipe (2) and an oil pipe hanger (3), wherein a second well liquid channel (31) is arranged on the oil pipe hanger (3), and the offshore oil well hot water circulation wellhead traversing device is characterized by further comprising a traversing pipe (4), an adapter (5), a circulation pipe hanger (6) and a circulation pipe (7); the tubing hanger (3) is also provided with a second traversing hole (32) for accommodating the traversing tube (4) to pass through, and the second traversing hole (32) is positioned beside the second well fluid channel (31); the traversing pipe (4) passes through the second traversing hole (32) along the well flow direction to be connected with the adapter (5), and the lower part of the adapter (5) is sequentially connected with the circulating pipe hanger (6) and the circulating pipe (7); the adapter (5) is provided with a third well liquid channel, a first hot water channel and a first backwater channel, and the circulating pipe hanger (6) is provided with a fourth well liquid channel (64), a second hot water channel and a second backwater channel; the second well liquid channel (31) is sequentially communicated with the third well liquid channel and the fourth well liquid channel (64), the first hot water pipe (1) is sequentially communicated with the first hot water flow channel, the second hot water flow channel and the circulating pipe (7) through the penetrating pipe (4), and the first water return pipe (2) is sequentially communicated with the first water return flow channel, the second water return flow channel and the circulating pipe (7) through the penetrating pipe (4).
2. The offshore oil well hot water circulation wellhead traversing device comprises an upper flange (8), an oil pipe four-way joint (9), a first hot water pipe (1), a first water return pipe (2) and an oil pipe hanger (3), wherein a second well liquid channel (31) is arranged on the oil pipe hanger (3), the upper flange (8) is provided with a first well liquid channel (81) and a first traversing hole (82), and the first traversing hole (82) is positioned beside the first well liquid channel (81); the oil pipe hanger (3) and the oil pipe four-way joint (9) are connected below the upper flange (8), and the first well liquid channel (81) and the second well liquid channel (31) are communicated, and the oil pipe hanger is characterized by further comprising a traversing pipe (4), an adapter (5), a circulating pipe hanger (6) and a circulating pipe (7); the tubing hanger (3) is also provided with a second traversing hole (32) for accommodating the traversing tube (4) to pass through, and the second traversing hole (32) is positioned beside the second well fluid channel (31); the traversing pipe (4) passes through the second traversing hole (32) along the well flow direction to be connected with the adapter (5), and the lower part of the adapter (5) is sequentially connected with the circulating pipe hanger (6) and the circulating pipe (7); the adapter (5) is provided with a third well liquid channel, a first hot water channel and a first backwater channel, and the circulating pipe hanger (6) is provided with a fourth well liquid channel (64), a second hot water channel and a second backwater channel; the second well liquid channel (31) is sequentially communicated with the third well liquid channel and the fourth well liquid channel (64), the first hot water pipe (1) is sequentially communicated with the first hot water flow channel, the second hot water flow channel and the circulating pipe (7) through the penetrating pipe (4), and the first water return pipe (2) is sequentially communicated with the first water return flow channel, the second water return flow channel and the circulating pipe (7) through the penetrating pipe (4).
3. The offshore oil well hot water circulation wellhead traversing device according to claim 1 or 2, wherein the traversing pipe (4) and the circulating pipe (7) are of sleeve structures, each of which is formed by sleeving an outer sleeve on an inner pipe, an annulus is reserved between the inner pipe and the outer pipe, the inner pipe and the outer pipe of the traversing pipe (4) are respectively a second hot water pipe and a second return water pipe, and the inner pipe and the outer pipe of the circulating pipe (7) are respectively a third hot water pipe and a third return water pipe.
4. A marine well hot water circulation wellhead traversing device according to claim 3, wherein the crossover joint (5) is provided with a second stepped bore (52), a third stepped bore (51) and two second side bores (53); the small hole of the second step hole (52) is communicated with one of the second side holes (53) to form a first hot water flow passage, and the large hole of the second step hole (52) is communicated with the other second side hole (53) to form a first water return flow passage; the third step hole (51) is a third well fluid channel.
5. The offshore well hot water circulation wellhead traversing device according to claim 4, wherein the circulation tube hanger (6) is further provided with a fourth stepped hole (61) and two third side holes (62); the large hole of the fourth step hole (61) is communicated with one of the third side holes (62) to form a second hot water flow passage, and the small hole of the fourth step hole (61) is communicated with the other third side hole (62) to form a second water return flow passage.
6. The offshore oil well hot water circulation wellhead traversing device according to claim 4 or 5, further comprising a heater (12) and a four-way joint (10), wherein the heater (12) is connected with the first hot water pipe (1) and the first return pipe (2), the four-way joint (10) is provided with a first step hole (101) and two first side holes (102), and the big holes and the small holes of the first step hole (101) are respectively communicated with the two first side holes (102); the first hot water pipe (1) is sequentially communicated with one of the first side holes (102), the small holes of the first step holes (101) and the second hot water pipe, and the first water return pipe (2) is sequentially communicated with the other first side hole (102), the large holes of the first step holes (101) and the second water return pipe.
7. The offshore oil well hot water circulation wellhead traversing device according to claim 6, wherein the upper end of the circulation pipe hanger (6) is inserted into the third step hole (51), the outer wall of the upper end of the circulation pipe hanger (6) is provided with a first limit step (63), and the limit step is in limit fit with the third step hole (51).
8. Offshore well hot water circulation wellhead traversing device according to claim 6, further comprising an oil pipe joint (11), the oil pipe joint (11) being screwed below the crossover joint (5).
9. The offshore oil well hot water circulation wellhead traversing device according to claim 8, wherein a second limit step (111) is arranged at the upper end of the oil pipe joint (11), and the second limit step (111) is in limit fit with the lower end of the circulation pipe hanger (6).
10. The offshore oil well hot water circulation wellhead traversing device according to any one of claims 7-9, wherein the fourth well fluid channel (64) is a plurality of through holes or through slots uniformly distributed around the third step hole (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320206946.8U CN219387854U (en) | 2023-02-14 | 2023-02-14 | Offshore oil well hot water circulation wellhead traversing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320206946.8U CN219387854U (en) | 2023-02-14 | 2023-02-14 | Offshore oil well hot water circulation wellhead traversing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219387854U true CN219387854U (en) | 2023-07-21 |
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ID=87168726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320206946.8U Active CN219387854U (en) | 2023-02-14 | 2023-02-14 | Offshore oil well hot water circulation wellhead traversing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219387854U (en) |
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2023
- 2023-02-14 CN CN202320206946.8U patent/CN219387854U/en active Active
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