CN108952616B - Sealing tool and sealing operation method - Google Patents
Sealing tool and sealing operation method Download PDFInfo
- Publication number
- CN108952616B CN108952616B CN201810816747.2A CN201810816747A CN108952616B CN 108952616 B CN108952616 B CN 108952616B CN 201810816747 A CN201810816747 A CN 201810816747A CN 108952616 B CN108952616 B CN 108952616B
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- Prior art keywords
- rod
- hanger
- sealing
- stress
- sealing tool
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- 238000007789 sealing Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 239000000725 suspension Substances 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 description 9
- 238000012856 packing Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a sealing tool and a sealing operation method, and relates to the technical field of wellhead sealing. The sealing tool comprises a hanger, a hanging coupling and a screwed plug, one end of the hanger is used for being detachably connected with an outlet of equipment, the other end of the hanger is detachably connected with the screwed plug to realize sealing of the equipment, the hanger comprises a hollow hanger, a supporting part is arranged in the hanger, and the hanging coupling and the supporting part are supported. The sealing tool and the sealing operation method provided by the invention have the advantages of reducing the workload of workers and improving the working efficiency.
Description
Technical Field
The invention relates to the technical field of wellhead sealing, in particular to a sealing tool and a sealing operation method.
Background
Along with the development of oil fields, various water shutoff, gas injection and other production increasing measures are increasing. When the pumping well carries out various operations at the same time, a wellhead polish rod, a packing box and a double-ram blowout preventer need to be dismantled and then sealed. The existing operation method for using the motor pumped well to seal the well mouth is to hang a polished rod by using a crane to carry out loading, remove the polished rod, a well mouth packing box and a blowout device, directly throw the sucker rod into the well, and use a high-pressure plug to seal.
However, the operation method has the disadvantages that the pumping rod can not be successfully salvaged once when the hanging and pumping operation is carried out, the operation method is repeated for many times, time and labor are wasted, the labor intensity of workers is increased, and the production timeliness is influenced.
How to improve the above problems is the focus of attention of those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a sealing tool to solve the problem that after sealing operation is performed, a sucker rod needs to be fished to perform the hanging and pulling operation, thereby increasing the workload of workers.
The invention also aims to provide a sealing operation method to solve the problem that in the prior art, after sealing operation is performed, a sucker rod needs to be fished to perform hanging and pumping operation, so that the workload of workers is increased.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
on one hand, the embodiment of the invention provides a sealing tool which comprises a hanger, a hanging coupling and a plug, wherein one end of the hanger is detachably connected with an outlet of equipment, the other end of the hanger is detachably connected with the plug so as to seal the equipment, the hanger comprises a hollow hanger, a butting part is arranged in the hanger, and the hanging coupling butts against the butting part.
Furthermore, the hanger comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are hollow cylinders, the outer diameter of the first connecting portion is the same as the inner diameter of the second connecting portion, the outer wall of the end portion of the first connecting portion is connected with the inner wall of the end portion of the second connecting portion, the abutting portion is formed by the end portion of the first connecting portion, and the diameter of the hanging coupling is smaller than the inner diameter of the second connecting portion and larger than the inner diameter of the first connecting portion.
Furthermore, the outer wall of the first connecting part, which is far away from the second connecting part, is provided with threads so that the first connecting part is in threaded connection with the outlet of the equipment, the inner wall of the second connecting part, which is far away from the first connecting part, is also provided with threads, and the second connecting part is in threaded connection with the plug so as to realize the sealing of the equipment.
Further, the first connecting portion and the second connecting portion are integrally formed.
Furthermore, the sealing tool further comprises a stress rod, and one end of the stress rod is detachably connected with the hanging collar.
Further, the stress rod includes the body of rod and atress portion, the diameter of atress portion is greater than the diameter of the body of rod, the one end of the body of rod with hang the coupling and can dismantle the connection, the other end of the body of rod with the atress portion is connected, just the body of rod with atress portion integrated into one piece.
Furthermore, the sealing tool further comprises a connecting rod, one end of the connecting rod is detachably connected with the hanging coupling, and the other end of the connecting rod is detachably connected with the function rod of the equipment.
Furthermore, the middle position of hanging the coupling is provided with the through-hole, the inner wall of through-hole is provided with the screw thread, hang the coupling be used for with the function pole threaded connection of equipment.
On the other hand, the invention also provides a sealing operation method, which is applied to a sealing tool, wherein the sealing tool comprises a hanger, a hanging coupling, a connecting rod and a plug, and the sealing method comprises the following steps:
connecting the connecting rod with a function rod of equipment by using elevator loading;
the hanger is sleeved outside the connecting rod;
installing a suspension collar at the end of the connecting rod away from the function rod;
taking out the elevator and installing the hanger at the outlet of the equipment by using the load of a crane;
mounting the suspension collar at a butt portion of the hanger;
and eliminating the load of a crane and installing the plug at the hanger.
Further, the sealing tool further comprises a stress rod, the stress rod comprises a stress part, and the steps of taking the elevator out and installing the hanger at the outlet of the equipment by using the crane for loading comprise:
connecting one end of the stress rod with the suspension collar;
and the crane is arranged at the stress part of the stress rod, and the crane is used for carrying.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a sealing tool and a sealing operation method, the sealing tool comprises a hanger, a hanging coupling and a plug, one end of the hanger is detachably connected with an outlet of equipment, the other end of the hanger is detachably connected with the plug so as to realize sealing of the equipment, the hanger comprises a hollow hanger, a butting part is arranged in the hanger, and the hanging coupling butts against the butting part. By using the sealing tool provided by the invention, the functional rod of the equipment can be suspended on a wellhead by using the hanger without throwing the functional rod into the equipment, so that a worker can more conveniently connect the relevant equipment during hanging and pulling operation, thereby reducing the workload and improving the working efficiency.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic structural diagram of a sealing tool according to an embodiment of the present invention.
Fig. 2 shows a cross-sectional schematic view of a hanger provided by an embodiment of the present invention.
Fig. 3 shows a flowchart of a sealing operation method provided by the present invention.
Fig. 4 shows a flowchart of the substeps of step S104 in fig. 3 provided by the present invention.
Icon: 100-making a sealing tool; 110-a hanger; 111-a first connection; 112-a second connection; 113-a holding portion; 120-hanging a collar; 130-a connecting rod; 140-force-bearing rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present invention provides a sealing tool 100, where the sealing tool 100 includes a hanger 110, a hanging collar 120, and a plug (not shown), one end of the hanger 110 is used for being detachably connected to an outlet of an apparatus, the other end of the hanger 110 is detachably connected to the plug, so as to implement sealing of the apparatus, the hanger 110 includes a hollow hanger 110, a supporting portion 113 is disposed inside the hanger 110, and the hanging collar 120 is supported by the supporting portion 113.
Specifically, in the present embodiment, the sealing tool 100 is applied to a pumped well, and certainly, in some other embodiments, the sealing tool 100 may also be applied to other industries, which is not limited in this embodiment.
The following description of the application of the sealing tool 100 to a pumped well is provided:
in the existing sealing operation, after a polished rod, a wellhead packing box and a blowout preventer are dismantled, the sucker rod is directly thrown into a well, and then a high-pressure plug is used for sealing. After the sealing operation method is used for sealing, when the sucker rod needs to be fished again, the sucker rod often needs to be connected and then taken out after being mounted for many times because workers cannot visually see the interface of the sucker rod, so that the working difficulty of the workers is increased, and the working efficiency is reduced.
In view of this, in the embodiment, the sealing tool 100 is used for sealing, that is, the hanger 110 and the hanging collar 120 are used together to hang the sucker rod on the well head of the pumping well, when the hanging operation is needed again, since the sucker rod is hung on the well head, the worker can visually see the sucker rod, so that the installation can be more convenient when other components are reinstalled, and the working efficiency is improved.
Further, to facilitate the use of the tool, the sealing tool 100 further includes a force rod 140, and one end of the force rod 140 is detachably connected to the suspension collar 120.
Specifically, in this embodiment, when a wellhead of the machine pumped well needs to be sealed, the polished rod is suspended by the crane for carrying, then the sucker rod is suspended by the elevator from the wellhead, and after the polished rod, the wellhead packing box and the blowout preventer are removed, the polished rod, the wellhead packing box and the blowout preventer are connected by the connecting rod 130 to the function rod of the machine pumped well, where the function rod described in this embodiment refers to the sucker rod of the machine pumped well.
In this embodiment, the end of the sucker rod is provided with a screw thread, one end of the connecting rod 130 is also provided with a screw thread, and the tap rod is connected with the connecting rod 130 by the screw thread. Further, the other end of the threaded rod is also provided with a thread, and after the connection rod 130 is installed, the suspension collar 120 may be installed on the other end of the connection rod 130. In this embodiment, the suspension collar 120 is a cylindrical block, and a through hole is formed in the middle of the suspension collar 120, and a thread is formed on the inner wall of the through hole, so that the suspension collar 120 is mounted on the other end of the connecting rod 130.
Further, before the suspension collar 120 is installed, a hanger 110 is further sleeved outside the connecting rod 130, in this embodiment, the hanger 110 includes a first connecting portion 111 and a second connecting portion 112, the first connecting portion 111 and the second connecting portion 112 are connected and integrally formed, the first connecting portion 111 and the second connecting portion 112 are both hollow cylinders, an outer diameter of the first connecting portion 111 is the same as an inner diameter of the second connecting portion 112, an outer wall of an end portion of the first connecting portion 111 is connected with an inner wall of an end portion of the second connecting portion 112, so as to form an abutting portion 113 by using the end portion of the first connecting portion 111, and a diameter of the suspension collar 120 is smaller than the inner diameter of the second connecting portion 112 and larger than the inner diameter of the first connecting portion 111. Meanwhile, the outer wall of the first connection portion 111, which is far away from the second connection portion 112, is provided with threads, and the effect of threaded connection of the first connection portion 111 and the outlet of the pumping well is achieved through the threads.
Meanwhile, in this embodiment, the sealing tool 100 further includes a stress rod 140, the stress rod 140 includes a rod body and a stress portion, the diameter of the stress portion is larger than that of the rod body, one end of the rod body and the stress portion are integrally formed, the other end of the rod body is provided with a thread, and the middle position of the hanging coupling 120 is provided with a thread, so that the thread indirection between the rod body and the hanging coupling 120 is realized. It should be noted that, because the diameter of the force-receiving portion is greater than the diameter of the rod body, the force-receiving portion can be loaded at the joint of the force-receiving portion and the rod body by using a crane, and an upward force is applied, so that the sucker rod can be lifted.
Further, after the sucker rod is lifted up, the elevator can be removed, and the hanger 110 is installed at the wellhead of the pumping well, which is provided with a screw thread, and the hanger 110 is fixed by tightening the hanger 110.
After the hanger 110 is fixed, the suspension coupling 120 can be installed at the abutting part 113 of the hanger 110 due to the abutting part 113 arranged inside the hanger 110, the suspension coupling 120 is supported by the abutting part 113, and the suspension coupling 120 is supported by the stress, and the connection rod 130 is connected with the sucker rod, so that the sucker rod is suspended, the sucker rod is not required to be thrown into the pumping well, and when a worker needs to perform the pumping operation again, the wellhead polished rod, the packing box, the double-ram blowout preventer and other related equipment can be connected more conveniently, so that the workload is reduced, and the working efficiency is improved.
Further, after the suspension collar 120 is placed on the hanger 110, the connecting rod 130 may be removed, and a plug may be installed at the end of the hanger 110, wherein the inner wall of the second connecting portion 112 far from the first connecting portion 111 is provided with a thread, and the second connecting portion 112 is screwed with the plug, thereby achieving the sealing of the equipment.
It should be noted that, because the sealing operation provided by the embodiment does not improve other devices of the pumped well, the related production equipment does not need to be reproduced, the cost is saved, and the installation is more convenient.
Second embodiment
Referring to fig. 2, an embodiment of the present invention provides a sealing operation method applied to the sealing tool 100 according to the first embodiment, the sealing method includes:
step S101, connecting the connecting rod 130 with a function rod of a device by using elevator loading.
In step S102, the hanger 110 is fitted around the connecting rod 130.
In step S103, the suspension collar 120 is attached to the end of the connection rod 130 away from the functional rod.
Step S104, loading by using a crane, taking out the elevator and installing the hanger 110 at the outlet of the equipment.
Wherein, step S104 includes:
in sub-step S1041, one end of the force-bearing rod 140 is connected to the suspension collar 120.
And a substep S1042 of mounting the crane at the stress part of the stress bar 140 and carrying by the crane.
In step S105, the suspension collar 120 is attached to the abutting portion 113 of the hanger 110.
Step S106, the hoisting machine is removed from loading, and the plug is installed at the hanger 110.
In summary, the present invention provides a sealing tool and a sealing operation method, the sealing tool includes a hanger, a hanging collar and a plug, one end of the hanger is detachably connected to an outlet of a device, the other end of the hanger is detachably connected to the plug to seal the device, the hanger includes a hollow hanger, a supporting portion is provided inside the hanger, and the hanging collar is supported by the supporting portion. By using the sealing tool provided by the invention, the functional rod of the equipment can be suspended on a wellhead by using the hanger without throwing the functional rod into the equipment, so that a worker can more conveniently connect the relevant equipment during hanging and pulling operation, thereby reducing the workload and improving the working efficiency.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (5)
1. The sealing tool is characterized by comprising a hanger, a hanging coupling and a plug, wherein one end of the hanger is detachably connected with an outlet of equipment, the other end of the hanger is detachably connected with the plug so as to realize sealing of the equipment, the hanger comprises a hollow hanger, a butting part is arranged in the hanger, and the hanging coupling butts against the butting part; wherein,
the hanger comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are hollow cylinders, the outer diameter of the first connecting part is the same as the inner diameter of the second connecting part, the outer wall of the end part of the first connecting part is connected with the inner wall of the end part of the second connecting part so as to form the abutting part by utilizing the end part of the first connecting part, and the diameter of the hanging coupling is smaller than the inner diameter of the second connecting part and larger than the inner diameter of the first connecting part;
the first connecting part and the second connecting part are integrally formed;
the sealing tool also comprises a stress rod, and one end of the stress rod is detachably connected with the hanging coupling;
the stress rod comprises a rod body and a stress part, the diameter of the stress part is larger than that of the rod body, one end of the rod body is detachably connected with the suspension coupling, the other end of the rod body is connected with the stress part, and the rod body and the stress part are integrally formed;
the sealing tool further comprises a connecting rod, one end of the connecting rod is detachably connected with the hanging coupling, and the other end of the connecting rod is used for being detachably connected with the function rod of the equipment.
2. The sealing tool of claim 1, wherein an outer wall of the first connection portion remote from the second connection portion is threaded to threadably connect the first connection portion to the outlet of the device, and an inner wall of the second connection portion remote from the first connection portion is also threaded to threadably connect the second connection portion to the plug to effect sealing of the device.
3. The sealing tool of claim 1, wherein the suspension collar is provided with a through hole at a middle position, an inner wall of the through hole is provided with threads, and the suspension collar is used for being in threaded connection with a function rod of the equipment.
4. A method of sealing operation applied to a sealing tool according to any one of claims 1 to 3, the sealing tool including a hanger, a suspension collar, a connecting rod, and a plug, the method comprising:
connecting the connecting rod with a function rod of equipment by using elevator loading;
the hanger is sleeved outside the connecting rod;
installing a suspension collar at the end of the connecting rod away from the function rod;
taking out the elevator and installing the hanger at the outlet of the equipment by using the load of a crane;
mounting the suspension collar at a butt portion of the hanger;
hoisting the crane and installing the plug at the hanger;
the hanger comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are hollow cylinders, the outer diameter of the first connecting portion is the same as the inner diameter of the second connecting portion, the outer wall of the end portion of the first connecting portion is connected with the inner wall of the end portion of the second connecting portion, the abutting portion is formed by the end portion of the first connecting portion, and the diameter of the hanging coupling is smaller than the inner diameter of the second connecting portion and larger than the inner diameter of the first connecting portion.
5. The method of sealing operation as claimed in claim 4, wherein said sealing tool further comprises a force bar, said force bar including a force receiving portion, and said step of lifting the elevator with the crane and mounting the hanger at the exit of the apparatus comprises:
connecting one end of the stress rod with the suspension collar;
and the crane is arranged at the stress part of the stress rod, and the crane is used for carrying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816747.2A CN108952616B (en) | 2018-07-24 | 2018-07-24 | Sealing tool and sealing operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816747.2A CN108952616B (en) | 2018-07-24 | 2018-07-24 | Sealing tool and sealing operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108952616A CN108952616A (en) | 2018-12-07 |
| CN108952616B true CN108952616B (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810816747.2A Expired - Fee Related CN108952616B (en) | 2018-07-24 | 2018-07-24 | Sealing tool and sealing operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108952616B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204312015U (en) * | 2014-11-17 | 2015-05-06 | 中国石油天然气股份有限公司 | Wellhead blowout preventer of oil pumping well |
| CN104963634A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Method for tripping sucker rod |
| CN205189811U (en) * | 2015-12-15 | 2016-04-27 | 中国石油化工股份有限公司 | Sealed wellhead assembly |
| CN106285544A (en) * | 2015-05-25 | 2017-01-04 | 易鲁川 | A kind of thermal recovery steam injection well head obturator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7306031B2 (en) * | 2004-07-15 | 2007-12-11 | Gadu, Inc. | Tubing string rotator and method |
-
2018
- 2018-07-24 CN CN201810816747.2A patent/CN108952616B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204312015U (en) * | 2014-11-17 | 2015-05-06 | 中国石油天然气股份有限公司 | Wellhead blowout preventer of oil pumping well |
| CN106285544A (en) * | 2015-05-25 | 2017-01-04 | 易鲁川 | A kind of thermal recovery steam injection well head obturator |
| CN104963634A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Method for tripping sucker rod |
| CN205189811U (en) * | 2015-12-15 | 2016-04-27 | 中国石油化工股份有限公司 | Sealed wellhead assembly |
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| CN108952616A (en) | 2018-12-07 |
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Granted publication date: 20210917 |