CN110552651B - Novel deep water wellhead equipment - Google Patents
Novel deep water wellhead equipment Download PDFInfo
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- CN110552651B CN110552651B CN201810561706.3A CN201810561706A CN110552651B CN 110552651 B CN110552651 B CN 110552651B CN 201810561706 A CN201810561706 A CN 201810561706A CN 110552651 B CN110552651 B CN 110552651B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 84
- 238000013461 design Methods 0.000 claims abstract description 8
- 230000005465 channeling Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 15
- 238000005299 abrasion Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 8
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- E21B33/043—Casing heads; Suspending casings or tubings in well heads specially adapted for underwater 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)
- Excavating Of Shafts Or Tunnels (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of petroleum well equipment design, in particular to novel deepwater wellhead equipment. In the design of the invention, the arc-shaped structure at the outer side of the low-pressure wellhead backflow hole is used for preventing the upward channeling of the hydrate; the inner side of the high-pressure wellhead is dispersed for bearing, the design of each layer of sleeve hanging with a bearing lock ring increases the total bearing capacity of the high-pressure wellhead, meets the operation requirement of a deeper water area, and can also solve the requirement of corrosion prevention; the rigid locking ring between the high-pressure well head and the low-pressure well head can simultaneously meet the requirements of common operation and deepwater locking and bending resistance enhancement; the universal sealing assembly can meet the sealing requirements of casing hanging annular spaces at different layers.
Description
Technical Field
The invention relates to the technical field of petroleum well equipment design, in particular to novel deepwater wellhead equipment.
Background
With the development of the national ocean strategy towards deep water, the development of the deep water oil and gas field is gradually going to deeper sea areas, the oil and gas exploration in China shows that the deep water sea areas in the east and west of the south sea have larger reserves, and the development of the deep water oil and gas field by the China ocean oil and gas head company, the China oil and gas head company and the China petrochemical head company is also more and more important, and particularly the China ocean oil and gas head company has larger discovery in the deep water sea areas in the west of the south sea and the mouth basin of the Zhujiang in recent years. However, deep water oil and gas exploration and development equipment in the market is a first-color European and American product, the products are sometimes subjected to technological monopoly in European and American countries, domestic oil companies are limited in purchasing period and technical support, and even the project period can only be delayed because the timely purchasing of the products is not obtained, and the timely technical support is not obtained when the products are used on site, so that small problems are changed into major accidents, and additional cost is increased.
In addition, only five companies in the united states and norway are currently available on the market, and their products, while they tend to be mature, suffer from a number of disadvantages. Aiming at a deepwater well completion well, the deep water well head equipment has the advantages of high bearing capacity, high bending strength, high corrosion resistance and high working temperature and working pressure requirements. On the bearing steps of the high-pressure wellhead, the bearing capacity is improved by embedding the hard alloy, but the corrosion resistance of the hard alloy is limited, and the locking ring of the annular sealing assembly is utilized to provide support, so that the internal space of the bearing steps is reduced, and the difficulty of the running tool and the subsequent operation of sitting and hanging is increased. The matched rigid locking of the high-low pressure wellhead is complex, and the design is lacking in the aspect of waterproof compound.
Disclosure of Invention
In view of the above problems, the invention provides novel deepwater wellhead equipment which can increase the total bearing capacity of a high-pressure wellhead to meet the operation requirement of a deeper water area, meet the common operation requirement and the requirement of deepwater locking for enhancing bending resistance, simultaneously meet the sealing requirements of casing hanging annular spaces at different layers and solve the corrosion prevention requirement.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention relates to novel deepwater wellhead equipment, which comprises a low-pressure wellhead, a high-pressure wellhead, a first sleeve hanger, a second sleeve hanger, a third sleeve hanger, a general sealing assembly and an abrasion-resistant core supplement,
The low-pressure wellhead is provided with a low-pressure wellhead seat-hanging step, the lower part of the low-pressure wellhead seat-hanging step is provided with a return hole, the low-pressure wellhead is also provided with a first low-pressure wellhead inner surface, a second low-pressure wellhead inner surface and a low-pressure wellhead lock ring groove, the second low-pressure wellhead inner surface is arranged above the first low-pressure wellhead inner surface, the high-pressure wellhead is provided with a high-pressure wellhead seat-hanging step, the upper end of the high-pressure wellhead is provided with a high-pressure wellhead connection interface and a high-pressure metal sealing surface, the lower end of the high-pressure wellhead is provided with a bearing step surface, the outer side of the high-pressure wellhead is additionally provided with a sealing ring, the high-pressure wellhead is provided with a third high-pressure wellhead lock ring groove, a first high-pressure wellhead lock ring groove, a lock ring groove and a second high-pressure wellhead lock ring groove, the second high-pressure wellhead lock ring groove is arranged above the third high-pressure wellhead lock ring groove, the lock ring groove is arranged above the high-pressure wellhead, the high-pressure metal sealing surface is further provided with a high-pressure wellhead sealing surface, and the high-pressure wellhead seal surface is matched with the high-pressure metal sealing surface;
the second casing hanger is provided with a supporting lock ring, the supporting lock ring is provided with a lock ring bearing step, the supporting lock ring is matched with a third high-pressure wellhead lock ring groove for use, the supporting lock ring can be locked into the third high-pressure wellhead lock ring groove under the action of the second supporting ring, the third casing hanger is provided with a top outer step, a casing hanger outer sealing surface, a casing hanger inner step and a casing padlock ring groove, the outer side of the third casing hanger is provided with a third casing padlock ring groove, the inner side of the third casing hanger is provided with a third casing padlock ring groove, the outer side of the middle part of the third casing hanger is also provided with a locking ring, and the locking ring is provided with a lock ring supporting inner step;
The universal sealing assembly is provided with a main body inner step and a sitting and hanging step of the sealing assembly, the universal sealing assembly is provided with a first locking ring, a second locking ring, an outer locking ring and an inner locking ring, the first locking ring is arranged above the outer side of the second locking ring, the outer side of the universal sealing assembly is provided with an outer sealing point, the inner side of the universal sealing assembly is provided with a sealing assembly inner sealing point, and the outer sealing point and the sealing assembly inner sealing point are oppositely arranged.
Further, the number of the sealing rings is two.
Furthermore, the upper end of the return hole is provided with an arc surface, so that the damage of hydrate on other equipment caused by the fact that the hydrate directly upwards flees along the outer side of the low-pressure wellhead is avoided.
Further, a recovery feeding groove is arranged at the top of the sleeve hanging inner step and used for taking and feeding the abrasion-resistant core.
Furthermore, the low-pressure wellhead head, the high-pressure wellhead head, the first sleeve hanger, the second sleeve hanger, the third sleeve hanger and the general sealing assembly are all made of corrosion-resistant alloy steel.
The invention has the advantages and beneficial effects that: the novel deepwater wellhead equipment can increase the total bearing capacity of the high-pressure wellhead to meet the operation requirement of a deeper water area, meet the common operation requirement and the requirement of deepwater locking to enhance the bending resistance, simultaneously meet the sealing requirement of casing hanging annular spaces at different layers and solve the corrosion resistance requirement.
In the design of the invention, the arc-shaped structure at the outer side of the low-pressure wellhead backflow hole is used for preventing the upward channeling of the hydrate; the inner side of the high-pressure wellhead is dispersed for bearing, the design of each layer of sleeve hanging with a bearing lock ring increases the total bearing capacity of the high-pressure wellhead, meets the operation requirement of a deeper water area, and can also solve the requirement of corrosion prevention; the rigid locking ring between the high-pressure well head and the low-pressure well head can simultaneously meet the requirements of common operation and deepwater locking and bending resistance enhancement; the universal sealing assembly can meet the sealing requirements of casing hanging annular spaces at different layers.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a novel deepwater wellhead device.
Description of the reference numerals
1. Low pressure wellhead 2, high pressure wellhead 3, high pressure metal seal face 4, high pressure wellhead connection interface 5, lock ring groove 6, wear resistant refill 7, recovery feed groove 8, first lock ring 9, outer lock ring 10, first high pressure wellhead lock ring groove 11, seal assembly main body inner step 12, top outer step 13, sleeve padlock ring groove 14, inner lock ring 15, second lock ring 16, outer seal point 17, high pressure wellhead inner seal face 18, seal assembly inner seal point 19, sleeve hanger outer seal face 20, seat hanger step 21, sleeve hanger inner step 22, lock ring 23, second high pressure wellhead lock ring groove 24, lock ring support inner step 25, lock ring support outer step 27, first support ring 28, third support ring 28. Casing hanger 29, second casing hanger 31, lower pressure wellhead upper contact face 32, rigid locking ring face 33, lower pressure wellhead upper step 34, first casing hanger 35, seal ring 36, first lower pressure wellhead inner face 37, first casing hanger landing step face 38, load bearing step face 39, flowback bore 201, high pressure wellhead landing step 202, lower pressure wellhead landing step 203, second lower pressure wellhead inner face 204, rigid locking ring 205, pressure ring 206, low pressure wellhead lock ring groove 207, cambered surface 208, support lock ring 209, second support ring 210, third high pressure wellhead lock ring groove 211, lock ring bearing step 101, universal seal assembly 103, third sleeve padlock ring groove
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
A novel deepwater wellhead equipment is shown in fig. 1, and comprises a low-pressure wellhead 1, a high-pressure wellhead 2, a first sleeve hanger 34, a second sleeve hanger 29, a third sleeve hanger 28, a general seal assembly 101 and a wear-resistant supplement core 6, wherein the low-pressure wellhead 1 is provided with a low-pressure wellhead seat hanging step 202, the lower part of the low-pressure wellhead seat hanging step 202 is provided with a return hole 39, the low-pressure wellhead 1 is also provided with a first low-pressure wellhead inner surface 36, a second low-pressure wellhead inner surface 203 and a low-pressure wellhead lock ring groove 206, the second low-pressure wellhead inner surface 203 is arranged above the first low-pressure wellhead inner surface 36, the high-pressure wellhead 2 is provided with a high-pressure wellhead seat hanging step 201, the upper end of the high-pressure wellhead 2 is provided with a high-pressure wellhead connecting interface 4 and a high-pressure metal sealing surface 3, the lower end of the high-pressure wellhead 2 is provided with a bearing step surface 38, the outer side of the high-pressure wellhead 2 is additionally provided with a sealing ring 35, the high-pressure wellhead 2 is provided with a third high-pressure wellhead lock 210, the first high-pressure wellhead inner surface 203 and the low-pressure wellhead lock ring groove 23 are also provided with a high-pressure wellhead 2, the high-pressure wellhead 2 is provided with a high-pressure metal sealing ring groove 2, the high-pressure wellhead 2 is further provided with a high-pressure metal sealing ring groove 2, the high-pressure metal sealing ring groove is provided with a high-pressure metal sealing ring groove and a high-pressure sealing ring 2, the high-pressure sealing surface 2 is provided with a high pressure wellhead 2, and a high pressure sealing ring 2 is provided; the second casing hanger 29 is provided with a supporting lock ring 208, the supporting lock ring 208 is provided with a lock ring bearing step 211, the supporting lock ring 208 is matched with a third high-pressure wellhead lock ring groove 210 for use, the supporting lock ring 208 can be locked into the third high-pressure wellhead lock ring groove 210 under the action of the second supporting ring 209, the third casing hanger 28 is provided with a top outer step 12, a casing hanger outer sealing surface 19, a casing hanger inner step 21, the outer side of the third casing hanger 28 is provided with a casing padlock ring groove 13, the inner side of the third casing hanger 28 is provided with a third casing padlock ring groove 103, the outer side of the middle part of the third casing hanger 28 is also provided with a locking ring 22, and the locking ring 22 is provided with a lock ring supporting inner step 24; the general seal assembly 101 is provided with a seal assembly main body inner step 11 and a sitting and hanging step 20, the general seal assembly 101 is provided with a first lock ring 8, a second lock ring 15, an outer lock ring 9 and an inner lock ring 14, the first lock ring 8 is arranged above the outer side of the second lock ring 15, the outer side of the general seal assembly 101 is provided with an outer seal point 16, the inner side of the general seal assembly 101 is provided with a seal assembly inner seal point 18, and the outer seal point 16 and the seal assembly inner seal point 18 are oppositely arranged.
The high-pressure wellhead 2 is hung on the low-pressure wellhead hanging step 202 of the low-pressure wellhead 1 through the high-pressure wellhead hanging step 201, and is matched with the outer side of the high-pressure wellhead 2 through the first low-pressure wellhead inner surface 36 and the second low-pressure wellhead inner surface 203, so that high bending resistance is provided, a rigid locking ring 204 and a low-pressure wellhead locking groove 206 are provided for deep water operation, a large preload capacity is provided for the rigid locking ring 204 under the action of the compression ring 205, and bending stress borne by the high-pressure wellhead 2 is directly transmitted to the wellhead of the low-pressure wellhead 1 so as to strengthen the bending resistance, and two sealing rings 35 are added on the outer side of the high-pressure wellhead to be matched with the first low-pressure wellhead inner surface 36, so that hydrates are prevented from channeling into cavities of the high-pressure wellhead and the low-pressure wellhead, and damage is caused. The lower part of the low-pressure wellhead seat-hanging step 202 of the low-pressure wellhead 1 is provided with a backflow hole 39 according to operation requirements, and the upper end of the backflow hole 39 is provided with an arc surface 207 which is convenient for dispersing the hydrate, so that the hydrate is prevented from directly channeling upwards along the outer side of the low-pressure wellhead 1 to cause harm to other equipment.
The high-pressure wellhead 2 is a core component of wellhead equipment, and the upper end of the high-pressure wellhead 2 is provided with a high-pressure wellhead head connecting interface 4 connected with other equipment and is matched with a high-pressure metal sealing surface 3, so that a sealed high-pressure cavity can be formed with the other equipment. The high-pressure wellhead connection interface 4 can be designed differently according to the requirements of customers, and the weight bearing step surface 38 at the lower end of the high-pressure wellhead 2 is made of a material consistent with the material of the body, because the wellhead equipment adopts the sleeve hanging with the bearing rings at each layer to disperse and bear the bearing load, and the weight bearing step surface 38 only bears the weight of the sleeve carried by the first sleeve hanging 34 and the load when the pressure test is carried out on the universal sealing assembly 101. The second casing hanger 29 is provided with a self-contained support lock ring 208, and the second support ring 209 is activated during the lowering process so that the support lock ring 208 locks into the third high pressure wellhead lock ring groove 210 of the high pressure wellhead 2. The second casing hanger 29 now carries the casing weight through the lock ring bearing step 211 of the support lock ring 208, sits the weight all on the support lock ring 208 and then transfers the load through the support lock ring 208 into the high pressure wellhead 2. The top of the first sleeve hanger 34 is not subjected to any load, and the third sleeve hanger 28 is also locked into the locking ring groove 23 of the high-pressure wellhead 2 through the self-contained locking ring 22, and the supporting step 24 of the locking ring 22 is matched with the weight of the sleeve hanger 28 and the carrying sleeve in the lowering process through the action of triggering the first supporting ring 27, and the weight is directly transmitted to the body of the high-pressure wellhead 2 through the locking ring 22, and the top of the second sleeve hanger 29 is also not subjected to any load.
In the design process, considering the universality of equipment, the universal annular sealing assembly 101 is designed to be used between each layer of sleeve hanger and the high-pressure wellhead 2, the universal sealing assembly 101 is pressed in place in a gravity lowering mode, so that the inner sealing point 18 of the sealing assembly and the outer sealing surface 19 of the sleeve hanger realize metal sealing, meanwhile, the outer sealing point 16 of the universal sealing assembly 101 and the inner sealing surface 17 of the high-pressure wellhead 2 realize metal sealing, in order to ensure that the universal sealing assembly 101 is locked between the sleeve hanger and the high-pressure wellhead 2, the inner locking ring 14 is matched with the sleeve padlock ring groove 13, the outer locking ring 9 is matched with the first high-pressure wellhead locking ring groove 10 of the high-pressure wellhead 2, and the two locking rings are pressed downwards through a feeding tool to realize the locking effect of the two locking rings. The general seal assembly 101 is pressed into place by pressing the seal assembly main body inner step 11 onto the sleeve hanger top outer step 12.
After the sleeve hanger and seal assemblies of each layer are installed in place, the abrasion resistant supplementary core 6 for protecting the inner sealing surface is installed, the abrasion resistant supplementary core 6 shown in fig. 1 is used after the third sleeve hanger 28 and the universal seal assembly 101 are installed, the abrasion resistant supplementary core 6 is hung on the sleeve hanger inner step 21 of the third sleeve hanger 28 through the hanging step 20, and is locked in the third sleeve padlock ring groove 103 of the third sleeve hanger 28 through the second lock ring 15 to fix the abrasion resistant supplementary core. On top of the antiwear compensating core 6 there is a recovery feed tank 7 mainly for taking and feeding the antiwear compensating core 6. The upper part of the inner side of the high-pressure wellhead 2 is provided with a lock ring groove 5 which is mainly used for the recovery and the feeding of the high-pressure wellhead 2 by a feeding tool, and can also be used for locking and developing a tubing hanger.
The low-pressure wellhead 1, the high-pressure wellhead 2, the first sleeve hanger 34, the second sleeve hanger 29, the third sleeve hanger 28 and the general sealing assembly 101 are all made of corrosion-resistant alloy steel.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A novel deepwater wellhead device is characterized by comprising a low-pressure wellhead head, a high-pressure wellhead head, a first sleeve hanger, a second sleeve hanger, a third sleeve hanger, a general sealing assembly and an abrasion-resistant core supplement,
The low-pressure wellhead is provided with a low-pressure wellhead seat-hanging step, the lower part of the low-pressure wellhead seat-hanging step is provided with a return hole, the low-pressure wellhead is also provided with a first low-pressure wellhead inner surface, a second low-pressure wellhead inner surface and a low-pressure wellhead lock ring groove, the second low-pressure wellhead inner surface is arranged above the first low-pressure wellhead inner surface, the high-pressure wellhead is provided with a high-pressure wellhead seat-hanging step, the upper end of the high-pressure wellhead is provided with a high-pressure wellhead connection interface and a high-pressure metal sealing surface, the lower end of the high-pressure wellhead is provided with a bearing step surface, the outer side of the high-pressure wellhead is additionally provided with a sealing ring, the high-pressure wellhead is provided with a third high-pressure wellhead lock ring groove, a first high-pressure wellhead lock ring groove, a lock ring groove and a second high-pressure wellhead lock ring groove, the second high-pressure wellhead lock ring groove is arranged above the third high-pressure wellhead lock ring groove, the locking ring groove is arranged above the high-pressure wellhead, the high-pressure wellhead seat-hanging step is provided with a high-pressure metal sealing surface, and the high-pressure wellhead seat is used for bearing the bearing weight of a universal sleeve, and the high-pressure wellhead seat-hanging step is carried by the bearing weight, and the universal sealing sleeve is carried by the high-pressure wellhead sealing surface;
the second casing hanger is provided with a supporting lock ring, the supporting lock ring is provided with a lock ring bearing step, the supporting lock ring is matched with a third high-pressure wellhead lock ring groove for use, the supporting lock ring can be locked into the third high-pressure wellhead lock ring groove under the action of the second supporting ring, the third casing hanger is provided with a top outer step, a casing hanger outer sealing surface, a casing hanger inner step and a casing padlock ring groove, the outer side of the third casing hanger is provided with a third casing padlock ring groove, the inner side of the third casing hanger is provided with a third casing padlock ring groove, the outer side of the middle part of the third casing hanger is also provided with a locking ring, and the locking ring is provided with a lock ring supporting inner step;
The universal sealing assembly is provided with a main body inner step and a sitting and hanging step of the sealing assembly, the universal sealing assembly is provided with a first locking ring, a second locking ring, an outer locking ring and an inner locking ring, the first locking ring is arranged above the outer side of the second locking ring, the outer side of the universal sealing assembly is provided with an outer sealing point, the inner side of the universal sealing assembly is provided with a sealing assembly inner sealing point, and the outer sealing point and the sealing assembly inner sealing point are oppositely arranged;
The top of the first casing hanger does not bear any load, the third casing hanger is also locked into a locking ring groove of the high-pressure wellhead through a locking ring, the weight of the casing hanger and the carrying sleeve are directly transmitted to a body of the high-pressure wellhead through the locking ring under the action of touching the supporting ring in the process of lowering the supporting step of the locking ring, the top of the second casing hanger also does not bear any load, the universal annular sealing assembly uses the same design between each layer of casing hanger and the high-pressure wellhead, and the universal sealing assembly is pressed into place through a gravity lowering mode, so that the sealing points in the sealing assembly and the outer sealing surface of the casing hanger are sealed by metal; the inner lock ring is matched with a sleeve padlock ring groove, the outer lock ring is matched with a first high-pressure wellhead lock ring groove of a high-pressure wellhead, and the two lock rings are all formed by pressing the first lock ring of the universal sealing assembly downwards through a sending tool, so that the locking effect of the two lock rings is realized; the general sealing assembly is pressed into place, namely the inner step of the main body of the sealing assembly is pressed onto the outer step at the top of the sleeve hanger to enable the main body of the sealing assembly to be positioned, after each layer of sleeve hanger and the sealing assembly are installed in place, an anti-wear supplementary core for protecting the inner sealing surface is installed, the general sealing assembly is used after the third sleeve hanger and the general sealing assembly are installed, the anti-wear supplementary core is hung on the inner step of the sleeve hanger of the third sleeve hanger through a sitting hanging step, and is locked in a ring groove of a third sleeve padlock of the third sleeve hanger through a second locking ring to enable the anti-wear supplementary core to be fixed.
2. The novel deepwater wellhead assembly of claim 1, wherein the number of seal rings is two.
3. The novel deep water wellhead device according to claim 1, wherein the upper end of the return hole is provided with an arc surface, so that the hydrate is prevented from directly channeling upwards along the outer side of the low-pressure wellhead to cause damage to other devices.
4. The novel deepwater wellhead equipment of claim 1, wherein a recovery feeding groove is formed in the top of the casing hanger inner step and used for taking out and feeding the wear-resistant supplementary core.
5. The novel deepwater wellhead device of claim 1, wherein the low pressure wellhead, the high pressure wellhead, the first hanger, the second hanger, the third hanger and the universal seal assembly are all made of corrosion resistant alloy steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561706.3A CN110552651B (en) | 2018-06-04 | 2018-06-04 | Novel deep water wellhead equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561706.3A CN110552651B (en) | 2018-06-04 | 2018-06-04 | Novel deep water wellhead equipment |
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| CN110552651A CN110552651A (en) | 2019-12-10 |
| CN110552651B true CN110552651B (en) | 2024-06-11 |
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| CN201810561706.3A Active CN110552651B (en) | 2018-06-04 | 2018-06-04 | Novel deep water wellhead equipment |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115142809B (en) * | 2021-03-31 | 2024-06-11 | 派格水下技术(广州)有限公司 | Multi-well interconnected low pressure wellhead system for drilling base plate |
| CN114233232A (en) * | 2021-12-06 | 2022-03-25 | 中海石油(中国)有限公司 | High-pressure wellhead based on self-elevating drilling platform operation and matched tool thereof |
| CN114876398B (en) * | 2022-05-31 | 2023-05-26 | 中海石油(中国)有限公司 | Underwater wellhead assembly for shallow water |
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