CN213629277U - Wear-resistant oil drilling and production accessory - Google Patents
Wear-resistant oil drilling and production accessory Download PDFInfo
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- CN213629277U CN213629277U CN202022757990.7U CN202022757990U CN213629277U CN 213629277 U CN213629277 U CN 213629277U CN 202022757990 U CN202022757990 U CN 202022757990U CN 213629277 U CN213629277 U CN 213629277U
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- corrosion
- resistant
- guide
- pipeline
- resistant metal
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- 238000005553 drilling Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000003208 petroleum Substances 0.000 claims abstract description 80
- 238000005260 corrosion Methods 0.000 claims abstract description 79
- 230000007797 corrosion Effects 0.000 claims abstract description 78
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims abstract description 46
- 239000003063 flame retardant Substances 0.000 claims description 11
- 239000003822 epoxy resin Substances 0.000 claims description 10
- 229920000647 polyepoxide Polymers 0.000 claims description 10
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 7
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 4
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The utility model discloses a wear-resistant oil drilling accessory, which belongs to the technical field of oil drilling accessories and comprises an oil pipeline, wherein a plurality of guide rings which are distributed at equal intervals are arranged inside the oil pipeline, each guide ring comprises a corrosion-resistant metal ring, the outer wall of the corrosion-resistant metal ring is in clearance fit with the inner wall of the oil pipeline, a plurality of guide vanes which are distributed in an annular shape are fixed on the inner wall of the corrosion-resistant metal ring, and the guide vanes and the corrosion-resistant metal ring are integrally formed, so that the spiral guide effect can be realized by arranging a plurality of guide rings which are distributed at equal intervals inside the oil pipeline to effectively reduce the impact force of oil flow on the inside of the pipeline, thereby effectively improving the impact resistance of the oil pipeline, and the resistance of the guide vanes and the corrosion-resistant metal rings to the oil flow can be effectively reduced by the rotary connection of the corrosion-resistant metal rings and the guide vanes, the impact force of petroleum flow on the guide ring can be effectively reduced, and the service life of the guide ring is effectively prolonged.
Description
Technical Field
The utility model relates to an oil bores and adopts accessory technical field, more specifically says, relates to an oil bores and adopts accessory that stand wear and tear.
Background
The petroleum plays a role in national economy, is an important energy source, and has the advantages of high energy density (the combustion heat of the petroleum with equal weight is 50 percent higher than that of standard coal), convenient transportation and storage, small pollution degree to the atmosphere after combustion and the like compared with coal. Fuel oil extracted from petroleum is the main fuel for various kilns in the transportation, power station boilers, metallurgical and building material industries. Liquefied gas and pipeline gas which use petroleum as raw materials are high-quality fuels used in life of urban residents. Oil extraction refers to the act of excavating and extracting oil in places where oil is stored. During the process of oil production, oil and gas flow from the reservoir to the well bottom and rise from the well bottom to the well top.
Petroleum is one of important energy sources in the world, various accessories are required in the petroleum exploitation process, a petroleum pipeline for conveying petroleum is indispensable equipment, the pipeline oil conveying has the characteristics of large transportation capacity, good tightness, low cost, high safety coefficient and the like, a pipe of the petroleum pipeline is generally a steel pipe, the steel pipe is connected into a long-distance pipeline by using connecting devices such as welding, flanges and the like, and a valve is used for opening and closing control and flow regulation.
However, the existing petroleum pipeline has poor abrasion resistance, so that the fluid formed by petroleum in the oil transportation process has an impact effect on the inner wall of the pipeline, and after the pipeline is used for a long time, the phenomenon of pipeline abrasion damage caused by crude oil corrosion can occur, crude oil leakage is caused, the waste of petroleum resources is caused, the practicability and usability of the petroleum pipeline are reduced, and the petroleum pipeline is not beneficial to use of people.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
Problem to exist among the prior art, the utility model aims to provide a stand wear and tear oil drilling accessory, can realize utilizing the water conservancy diversion ring that sets up a plurality of equidistances and arrange in petroleum pipeline's inside, form spiral helicine water conservancy diversion effect to petroleum stream, the effectual impact force that reduces petroleum stream and cause to pipeline inside, thereby the effectual shock resistance who promotes petroleum pipeline, corrosion-resistant metal ring and water conservancy diversion piece rotate to be connected and can effectively reduce the resistance of water conservancy diversion piece and corrosion-resistant metal ring to petroleum stream, can also effectively reduce the impact force of petroleum stream to water conservancy diversion ring, effectively prolong the life of water conservancy diversion ring.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A wear-resistant oil drilling and production accessory comprises an oil pipeline, wherein a plurality of guide rings which are distributed at equal intervals are arranged inside the oil pipeline, each guide ring comprises a corrosion-resistant metal ring, the outer wall of each corrosion-resistant metal ring is in clearance fit with the inner wall of the oil pipeline, a plurality of guide vanes which are distributed annularly are fixed on the inner wall of each corrosion-resistant metal ring, the guide vanes and the corrosion-resistant metal rings are integrally formed, the guide vanes are obliquely arranged, the included angle between each guide vane and the tangent direction of the connection point where the guide vane is located is 30-45 degrees, the included angle between each guide vane and the straight line direction of the internally circulated liquid flow is 30-45 degrees, a first annular clamping groove is formed in the center of the outer wall of each guide vane, the vertical section of each first annular clamping groove is arc-shaped, a second annular clamping groove which is arranged corresponding to the first annular clamping groove is formed, a plurality of rotating balls are embedded into the first annular clamping groove and the second annular clamping groove, and the petroleum pipeline and the flow guide ring are connected in a clamping mode through the rotating balls. The inner part of the petroleum pipeline is provided with a plurality of guide rings which are distributed at equal intervals, when petroleum flows circulate in the petroleum pipeline, a plurality of guide vanes arranged on the inner wall of the corrosion-resistant metal ring can effectively guide the flow, because the guide vanes are obliquely arranged, and the included angle between the guide vanes and the linear direction of the liquid flow circulating in the inner part is 30-45 degrees, when the petroleum flows through the guide vanes, the petroleum flows can form a spiral guide effect, the impact force of the petroleum flows on the inner part of the pipeline is effectively reduced, so that the impact resistance of the petroleum pipeline is effectively improved, because the rotary ball is arranged between the petroleum pipeline and the guide rings, the guide rings and the petroleum pipeline are rotatably clamped, when the petroleum flows contact the guide vanes, the corrosion-resistant metal ring and the guide vanes rotate, so that the resistance of the guide vanes and the corrosion-resistant metal ring on the petroleum flows is effectively reduced, and the impact force of the petroleum flows on the, effectively prolong the life of water conservancy diversion ring, the water conservancy diversion piece sets up with corrosion-resistant metal ring integrated into one piece in addition, and intensity is high, and stability is good.
Furthermore, 6-8 flow deflectors are arranged on the corrosion-resistant metal ring, so that the spiral flow guiding effect is effectively improved.
Furthermore, the outer walls of the corrosion-resistant metal ring and the flow deflector are coated with corrosion-resistant paint layers, so that the corrosion resistance of the corrosion-resistant metal ring and the corrosion-resistant flow deflector is effectively improved, and the service life of the corrosion-resistant metal ring and the corrosion-resistant flow deflector is prolonged.
Further, the petroleum pipeline is a laminated structure compounded by a plurality of layers of structures, the laminated structure comprises a pipeline body, an outer sheath is bonded on the outer wall of the pipeline body, an acrylate fiber flame-retardant layer, a glass fiber corrosion-resistant layer and an epoxy resin corrosion-resistant layer are sequentially bonded inside the pipeline body, and a nano titanium alloy wear-resistant layer is compounded on the inner wall of the epoxy resin corrosion-resistant layer. The petroleum pipeline is arranged to be of a layered structure consisting of a pipeline body, an acrylate fiber flame-retardant layer, a glass fiber corrosion-resistant layer, an epoxy resin corrosion-resistant layer, a nano titanium alloy wear-resistant layer and an outer sheath, so that the wear resistance, corrosion resistance and flame retardance of the petroleum pipeline are greatly improved, and the service life of the petroleum pipeline is prolonged.
Furthermore, the outer sheath is a halogen-free flame-retardant outer sheath, so that the petroleum pipeline is comprehensively protected from the outside, and the protection effect is further improved.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
(1) the inner part of the petroleum pipeline is provided with a plurality of guide rings which are distributed at equal intervals, when petroleum flows circulate in the petroleum pipeline, a plurality of guide vanes arranged on the inner wall of the corrosion-resistant metal ring can effectively guide the flow, because the guide vanes are obliquely arranged, and the included angle between the guide vanes and the linear direction of the liquid flow circulating in the inner part is 30-45 degrees, when the petroleum flows through the guide vanes, the petroleum flows can form a spiral guide effect, the impact force of the petroleum flows on the inner part of the pipeline is effectively reduced, so that the impact resistance of the petroleum pipeline is effectively improved, because the rotary ball is arranged between the petroleum pipeline and the guide rings, the guide rings and the petroleum pipeline are rotatably clamped, when the petroleum flows contact the guide vanes, the corrosion-resistant metal ring and the guide vanes rotate, so that the resistance of the guide vanes and the corrosion-resistant metal ring on the petroleum flows is effectively reduced, and the impact force of the petroleum flows on the, effectively prolong the life of water conservancy diversion ring, the water conservancy diversion piece sets up with corrosion-resistant metal ring integrated into one piece in addition, and intensity is high, and stability is good.
(2) 6-8 flow deflectors are arranged on the corrosion-resistant metal ring, and the spiral flow guiding effect is effectively improved.
(3) The outer walls of the corrosion-resistant metal ring and the flow deflector are coated with corrosion-resistant paint layers, so that the corrosion resistance of the corrosion-resistant metal ring and the corrosion-resistant flow deflector is effectively improved, and the service life of the corrosion-resistant metal ring and the corrosion-resistant flow deflector is prolonged.
(4) The petroleum pipeline is arranged to be of a layered structure consisting of a pipeline body, an acrylate fiber flame-retardant layer, a glass fiber corrosion-resistant layer, an epoxy resin corrosion-resistant layer, a nano titanium alloy wear-resistant layer and an outer sheath, so that the wear resistance, corrosion resistance and flame retardance of the petroleum pipeline are greatly improved, and the service life of the petroleum pipeline is prolonged.
(5) The outer sheath is a halogen-free flame-retardant outer sheath, so that the petroleum pipeline is comprehensively protected from the outside, and the protection effect is further improved.
Drawings
FIG. 1 is a sectional view of the internal structure of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
fig. 3 is an axial view of the middle deflector ring of the present invention;
fig. 4 is a front view of the middle deflector ring of the present invention;
fig. 5 is a side view of the middle deflector ring of the present invention;
fig. 6 is a schematic view of the layered structure of the petroleum pipeline according to the present invention.
The reference numbers in the figures illustrate:
the anti-corrosion pipeline comprises a petroleum pipeline 1, a pipeline body 101, an acrylate fiber flame-retardant layer 102, a glass fiber corrosion-resistant layer 103, an epoxy resin corrosion-resistant layer 104, a titanium alloy wear-resistant layer 105, an outer sheath 106, a flow guide ring 2, a corrosion-resistant metal ring 3, a flow guide sheet 4, a first annular clamping groove 5, a second annular clamping groove 6 and a rotating ball 7.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all belong to the protection scope of the utility model.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1-5, a wear-resistant oil drilling and production accessory comprises an oil pipeline 1, a plurality of guide rings 2 distributed at equal intervals are arranged in the oil pipeline 1, the interval between two adjacent guide rings 2 can be selected according to transmission pressure, the larger the pressure is, the smaller the interval is, the guide rings 2 comprise corrosion-resistant metal rings 3, the outer walls of the corrosion-resistant metal rings 3 are in clearance fit with the inner wall of the oil pipeline 1, a plurality of guide vanes 4 distributed annularly are fixed on the inner wall of the corrosion-resistant metal rings 3, the guide vanes 4 and the corrosion-resistant metal rings 3 are integrally formed, the guide vanes 4 are obliquely arranged, the included angle between the guide vanes 4 and the tangent direction of the connection points where the guide vanes are located is 30-45 degrees, the included angle between the guide vanes 4 and the straight line direction of the internally circulated liquid flow is 30-45 degrees, a first annular clamping groove 5 is formed in the center of the outer walls of the guide vanes 4, the inner wall of petroleum pipeline 1 is seted up with the corresponding second annular joint groove 6 that sets up in first annular joint groove 5, and the inside embedding of first annular joint groove 5 and second annular joint groove 6 has a plurality of rotation balls 7, and petroleum pipeline 1 and water conservancy diversion ring 2 are connected through rotating 7 joints of ball. The inner part of the petroleum pipeline 1 is provided with a plurality of guide rings 2 which are distributed at equal intervals, when petroleum flows circulate in the petroleum pipeline 1, a plurality of guide plates 4 arranged on the inner wall of a corrosion-resistant metal ring 3 can effectively guide the flow, because the guide plates 4 are obliquely arranged, and the included angle between the guide plates 4 and the linear direction of the internal circulating liquid flow is 30-45 degrees, when the petroleum flows through the guide plates 4, the petroleum flows can form a spiral flow guide effect, the impact force of the petroleum flows on the inner part of the pipeline is effectively reduced, so that the impact resistance of the petroleum pipeline 1 is effectively improved, because rotating balls 7 are arranged between the petroleum pipeline 1 and the guide rings 2, the guide rings 2 and the petroleum pipeline 1 are rotationally clamped, when the petroleum flows contact the guide plates 4, the corrosion-resistant metal ring 3 and the guide plates 4 rotate, so that the resistance of the guide plates 4 and the corrosion-resistant metal ring 3 to the petroleum flows is effectively reduced, the impact force of petroleum flow on the guide ring 2 can be effectively reduced, the service life of the guide ring 2 is effectively prolonged, and in addition, the guide pieces 4 and the corrosion-resistant metal ring 3 are integrally formed, so that the strength is high, and the stability is good.
Referring to fig. 3-4, 6-8 flow deflectors 4 are arranged on the corrosion-resistant metal ring 3 to effectively improve the spiral flow guiding effect.
Referring to fig. 3-4, the outer walls of the corrosion-resistant metal ring 3 and the flow deflector 4 are coated with corrosion-resistant paint layers, so that the corrosion resistance of the corrosion-resistant metal ring 3 and the flow deflector 4 is effectively improved, and the service life of the flow deflector is prolonged.
Referring to fig. 6, the petroleum pipeline 1 is a layered structure compounded by a plurality of layers, the layered structure includes a pipeline body 101, an outer sheath 106 is bonded on the outer wall of the pipeline body 101, an acrylate fiber flame-retardant layer 102, a glass fiber corrosion-resistant layer 103 and an epoxy resin corrosion-resistant layer 104 are sequentially bonded inside the pipeline body 101, and a nano titanium alloy wear-resistant layer 105 is compounded on the inner wall of the epoxy resin corrosion-resistant layer 104. The petroleum pipeline 1 is arranged to be of a layered structure consisting of a pipeline body 101, an acrylate fiber flame-retardant layer 102, a glass fiber corrosion-resistant layer 103, an epoxy resin corrosion-resistant layer 104, a nano titanium alloy wear-resistant layer 105 and an outer sheath 106, so that the wear resistance, corrosion resistance and flame retardance of the petroleum pipeline are greatly improved, and the service life of the petroleum pipeline is prolonged.
Referring to fig. 6, the outer jacket 106 is a halogen-free flame retardant outer jacket, and performs comprehensive external protection on the petroleum pipeline 1, so as to further improve the protection effect.
The above; is only a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; according to the technical scheme of the utility model and the improvement conception, equivalent substitution or change is carried out; are all covered by the protection scope of the utility model.
Claims (5)
1. A wear-resistant oil drilling and production accessory comprising an oil pipe (1), characterized in that: the petroleum pipeline is characterized in that a plurality of guide rings (2) which are distributed at equal intervals are arranged inside the petroleum pipeline (1), each guide ring (2) comprises a corrosion-resistant metal ring (3), the outer wall of each corrosion-resistant metal ring (3) is in clearance fit with the inner wall of the petroleum pipeline (1), a plurality of guide vanes (4) which are distributed annularly are fixed on the inner wall of each corrosion-resistant metal ring (3), each guide vane (4) and each corrosion-resistant metal ring (3) are integrally formed, each guide vane (4) is obliquely arranged, the included angle between each guide vane (4) and the tangent direction of the connection point where the guide vane (4) is located is 30-45 degrees, the included angle between each guide vane (4) and the straight line direction of the internal circulating liquid flow is 30-45 degrees, a first annular clamping groove (5) is formed in the center of the outer wall of each guide vane (4), and the vertical section of each first annular, the oil pipeline structure is characterized in that a second annular clamping groove (6) corresponding to the first annular clamping groove (5) is formed in the inner wall of the oil pipeline (1), a plurality of rotating balls (7) are embedded into the first annular clamping groove (5) and the second annular clamping groove (6), and the oil pipeline (1) and the flow guide ring (2) are connected in a clamping mode through the rotating balls (7).
2. A wear-resistant oil drilling and production accessory according to claim 1, wherein: 6-8 flow deflectors (4) are arranged on the corrosion-resistant metal ring (3).
3. A wear-resistant oil drilling and production accessory according to claim 1, wherein: and the outer walls of the corrosion-resistant metal ring (3) and the flow deflector (4) are coated with corrosion-resistant paint layers.
4. A wear-resistant oil drilling and production accessory according to claim 1, wherein: the petroleum pipeline (1) is a laminated structure compounded by a plurality of layers of structures, the laminated structure comprises a pipeline body (101), an outer sheath (106) is bonded on the outer wall of the pipeline body (101), an acrylate fiber flame-retardant layer (102), a glass fiber corrosion-resistant layer (103) and an epoxy resin corrosion-resistant layer (104) are sequentially bonded inside the pipeline body (101), and a nano titanium alloy wear-resistant layer (105) is compounded on the inner wall of the epoxy resin corrosion-resistant layer (104).
5. A wear resistant oil drilling and production accessory according to claim 4, wherein: the outer jacket (106) is a halogen-free flame retardant outer jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757990.7U CN213629277U (en) | 2020-11-25 | 2020-11-25 | Wear-resistant oil drilling and production accessory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757990.7U CN213629277U (en) | 2020-11-25 | 2020-11-25 | Wear-resistant oil drilling and production accessory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213629277U true CN213629277U (en) | 2021-07-06 |
Family
ID=76636454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022757990.7U Active CN213629277U (en) | 2020-11-25 | 2020-11-25 | Wear-resistant oil drilling and production accessory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213629277U (en) |
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2020
- 2020-11-25 CN CN202022757990.7U patent/CN213629277U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: YANCHENG HENGTONG PETROLEUM MACHINERY MANUFACTURING CO.,LTD. Assignor: YANCHENG JIAXIN PETROLEUM MACHINERY MANUFACTURE CO.,LTD. Contract record no.: X2023320000229 Denomination of utility model: A wear-resistant petroleum drilling and production accessory Granted publication date: 20210706 License type: Common License Record date: 20231115 |
|
| EE01 | Entry into force of recordation of patent licensing contract |