CN113718754A - Tension balancing system arranged at bottom of vertical pipe - Google Patents
Tension balancing system arranged at bottom of vertical pipe Download PDFInfo
- Publication number
- CN113718754A CN113718754A CN202110680821.4A CN202110680821A CN113718754A CN 113718754 A CN113718754 A CN 113718754A CN 202110680821 A CN202110680821 A CN 202110680821A CN 113718754 A CN113718754 A CN 113718754A
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- Prior art keywords
- tension
- anchor chain
- rov
- suction pile
- deepwater
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000013587 production medium Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/20—Accessories therefor, e.g. floats, weights
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a tension balancing system arranged at the bottom of a vertical pipe, which comprises a vertical pipe line terminal, a tension balancing anchor chain and a deepwater suction pile; one end of the tension balance anchor chain is connected with a lifting lug at a pipeline terminal through a shackle, and the other end of the tension balance anchor chain is connected with an underwater ROV lifting hook on the deep water suction pile through a reinforcing ring; the tension balance anchor chain consists of a reinforcing ring, a special end ring, an end ring, a common chain ring and a shackle which are connected in sequence; the deepwater suction pile comprises an ROV platform and an ROV lifting hook, and the ROV lifting hook is fixed on the ROV platform. In the invention, the steel catenary riser is communicated with the riser pipeline terminal, and the tension balancing anchor chain transmits unbalanced tension to the deepwater suction pile, and the passive balance of the tension is realized due to the unidirectional stress characteristic of the anchor chain, so that the aims of protecting the integrity and safety of deepwater marine pipe end facilities and underwater facilities connected with the deepwater marine pipe end facilities are fulfilled.
Description
Technical Field
The invention relates to a tension balancing system arranged at the bottom of a vertical pipe.
Background
One end of a Steel Catenary Riser (SCR) is connected with a floating production system, and the other end of the steel catenary riser is connected with a submarine pipeline terminal, so that the steel catenary riser is a key production medium conveying channel between an underwater production facility and the floating system, and is one of riser forms which are most widely applied in deep sea development due to the simple structural form and strong adaptability to high-temperature and high-pressure environments. However, if the length of a seabed section of a Steel Catenary Riser (SCR) is limited or the axial rigidity of soil at the seabed section is small, sufficient anchoring resistance cannot be provided for the whole riser, the movement of the floating production system under extreme environmental conditions can generate large axial tension at the end of the seabed section of the riser, so that the riser moves irreversibly towards the platform, the integrity of a pipeline end connector and a jumper is affected, and the problems of leakage, damage and the like of the whole system are caused.
Disclosure of Invention
The invention provides a tension balancing system arranged at the bottom of a riser, which can balance the larger tension at the bottom of a steel catenary riser and avoid the damage of the riser system.
In order to solve the technical problem, the invention provides a tension balancing system arranged at the bottom of a stand pipe, which comprises a stand pipe line terminal, a tension balancing anchor chain and a deepwater suction pile;
one end of the tension balance anchor chain is connected with a lifting lug at a pipeline terminal through a shackle, and the other end of the tension balance anchor chain is connected with an underwater ROV lifting hook on the deep water suction pile through a reinforcing ring; the tension balance anchor chain consists of a reinforcing ring, a special end ring, an end ring, a common chain ring and a shackle which are connected in sequence;
the deepwater suction pile comprises an ROV platform and an ROV lifting hook, and the ROV lifting hook is fixed on the ROV platform.
Further, the material selection, corrosion control, in-place strength, installation analysis and fatigue life of the riser line termination, the tension balancing anchor chain and the deepwater suction pile meet the requirements of bearing 300 tons of tension and guaranteeing 30 years of underwater service life.
Further, the tension balance anchor chain is connected with a lifting lug of the riser pipeline terminal through a 300T shackle; the lifting lug is made of DH36-Z35, and the strength of the connecting structure and the tolerance requirement of the shackle pin shaft are guaranteed by adopting a mode of flitch plates on two sides.
Furthermore, the total length of the tension balance anchor chain is about 90 meters, and DNVGL-OS-E302R 4 grade material is adopted.
Furthermore, the deepwater suction pile is made of API 2H Gr 50 materials, the diameter is 5m, the pile length is 20m, and the mud penetration depth is 19 m.
The invention has the technical effects that:
the passive tension balancing anchor chain can be used for passively balancing larger tension at the end part of the steel catenary riser to avoid system damage, the steel catenary riser is communicated with the riser pipeline terminal, the unbalanced tension is transmitted to the suction pile through the tension balancing anchor chain, and the passive balance of the tension is realized due to the unidirectional stress characteristic of the anchor chain, so that the purposes of protecting the integrity and the safety of facilities at the end part of the deepwater sea pipe and underwater facilities connected with the deepwater sea pipe are achieved.
The horizontal reliable transmission of riser bottom tension is realized to riser pipeline terminal one end through welding of one section pre-installation level straight tube nipple joint and the originated end of laying of SCR, and the other end is connected with 300T break-out on the tension balance anchor chain through the lug on the terminal frame extension structure, has realized tension conversion, and lug material DH36-Z35 adopts both sides flitch to guarantee structural strength and the tolerance requirement of break-out round pin axle.
The tension balance anchor chain has the total length of about 90 meters, is made of DNVGL-OS-E302R 4 grade materials, and consists of a reinforcing ring, a special end ring, an end ring, a common chain ring and a shackle assembly; the common chain ring and the end ring are of a baffled type, and the other chain ring and the end ring are of a non-baffled type so as to prevent the anchor chain from being twisted during installation; the size of the anchor chain component is gradually transited to the size of a common chain ring from two ends so as to facilitate underwater connection; the strength of the anchor chain is designed according to API-RP-2SK, the diameter of the anchor chain of the common chain ring after considering 12mm corrosion allowance is 58mm, and the minimum safe working tension is 3396 kN; one end of the tension balance anchor chain is connected with the pipeline terminal lifting lug through a shackle, and the other end of the tension balance anchor chain is connected with an underwater ROV lifting hook on the suction pile through a reinforcing ring, so that the bottom tension of the vertical pipe is finally transmitted to the deepwater suction pile.
The diameter of the deep water suction pile is 5m, the pile length is 20m, the mud penetration depth is 19m, the pile body is made of API 2H Gr 50 material, and the top of the deep water suction pile is provided with a drainage valve and an ROV operation platform, so that pile sinking and anchor chain connection operation are facilitated; the interior walls of the ROV hook are ground to match the size of the reinforcing ring to reduce stress concentrations.
The design specification of the deepwater suction pile is based on API-RP-2A, DNV-OS-C102 and API-RP-2SK, and the strength, the lateral deformation resistance and the stability of the pile body are checked based on a finite element analysis method to ensure the tension balance requirement in the whole life cycle of the steel catenary riser.
Drawings
FIG. 1 is an overall schematic view of a preferred embodiment of the present invention;
FIG. 2 is a diagram of a tension chain layout according to a preferred embodiment of the present invention;
fig. 3 is a perspective view of a deep water suction pile according to a preferred embodiment of the present invention.
Reference numerals: 1. a riser line termination; 2. a tension balancing anchor chain; 3. a deepwater suction pile; 21. a reinforcement ring; special end rings 22; 23. an end ring; 24. a plain chain link; 25. shackle dismounting; an ROV hook; an ROV platform.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
In the embodiment, as shown in fig. 1 to 3, the invention discloses a tension balancing system arranged at the bottom of a riser, which comprises a riser pipeline terminal 1, a tension balancing anchor chain 2 and a deepwater suction pile 3;
one end of the tension balance anchor chain 2 is connected with a lifting lug at a pipeline terminal through a shackle 25, and the other end of the tension balance anchor chain 2 is connected with an underwater ROV lifting hook 31 on the deep water suction pile 3 through a reinforcing ring 21; the tension balance anchor chain 2 consists of a reinforcing ring 21, a special end ring 22, an end ring 23, a common chain ring 24 and a shackle 25 which are connected in sequence;
deep water suction pile 3. deep water suction pile 3 includes ROV platform 32 and ROV hook 31, ROV hook 31 on ROV platform 32.
The selection of materials, corrosion control, in-place strength, installation analysis and fatigue life of the riser pipeline terminal 1, the tension balance anchor chain 2 and the deepwater suction pile 3 meet the requirements of bearing 300 tons of tension and guaranteeing 30-year underwater service life.
The tension balance anchor chain 2 is connected with a lifting lug of the riser pipeline terminal 1 through a 300T shackle 25; the lifting lug is made of DH36-Z35, and the strength of the connecting structure and the tolerance requirement of the pin shaft of the shackle 25 are guaranteed by adopting a mode of flitch plates on two sides.
The total length of the tension balance anchor chain 2 is about 90 meters, and DNVGL-OS-E302R 4 grade material is adopted.
The deepwater suction pile 3 is made of API 2H Gr 50 materials, the diameter is 5m, the pile length is 20m, and the mud penetration depth is 19 m. The pile body strength, the lateral deformation resistance, the pile body stability and the corrosion design of the deepwater suction pile 3 can ensure the tension balance requirement in the whole life cycle of the steel catenary riser.
The deep water suction pile 3 and the tension balance anchor chain 2 are used as a steel catenary riser J-shaped laying starting pile and a starting cable, tension is provided for riser starting laying, and riser starting laying and mounting operation is simplified.
The invention is implemented by the following steps:
1. temporarily fixing the terminal in a J-shaped laying tower according to an online installation process of a riser pipeline terminal 1, completing centering, welding, inspection and node coating of the head end of the riser and the riser pipeline terminal 1 according to an SCR (selective catalytic reduction) laying program, and pre-installing a tension balance anchor chain 2 and other auxiliary rigging;
2. the pre-installed tension balance anchor chain 2 and the riser pipeline terminal 1 are laid and lowered to the top of the deepwater suction pile 3 along with the J-shaped laying of the pipeline, the DMA, the auxiliary buoy and the rigging are lowered by a crane on a pipe laying vessel, and the lowering process is monitored by the ROV in the whole process;
3. connecting a crane rigging with an installation cable pre-installed on a tension balance anchor chain 2 through an ROV (remote operated vehicle), continuously lowering the tension balance anchor chain 2 until the tension balance anchor chain partially contacts the ground, and connecting a reinforcing ring 21 on the tension balance anchor chain 2 with an ROV lifting hook on a deepwater suction pile 3 through the ROV;
4. the pipe-laying ship continues to lay the SCR forwards, and simultaneously gradually tightens the tension balance anchor chain 2;
5. after the vertical pipe line terminal 1 is put down in place, the pipe laying ship normally lays the SCR, at the moment, the tension balance anchor chain 2 is in a tensioning state to provide initial laying tension for SCR laying, and the ROV recovers the temporary rigging and the buoy.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (5)
1. The utility model provides a locate tension balanced system of riser bottom which characterized in that: the device comprises a vertical pipe line terminal, a tension balance anchor chain and a deepwater suction pile;
one end of the tension balance anchor chain is connected with a lifting lug at a pipeline terminal through a shackle, and the other end of the tension balance anchor chain is connected with an underwater ROV lifting hook on the deep water suction pile through a reinforcing ring; the tension balance anchor chain consists of a reinforcing ring, a special end ring, an end ring, a common chain ring and a shackle which are connected in sequence; the deepwater suction pile comprises an ROV platform and an ROV lifting hook, and the ROV lifting hook is fixed on the ROV platform.
2. A tension balancing system according to claim 1, wherein: the requirements of bearing 300 tons of tension and ensuring 30-year underwater service life are met by the material selection, corrosion control, in-situ strength, installation analysis and fatigue life of the riser pipeline terminal, the tension balance anchor chain and the deepwater suction pile.
3. A tension balancing system according to claim 1, wherein: the tension balance anchor chain is connected with a lifting lug of the riser pipeline terminal through a 300T shackle; the lifting lug is made of DH36-Z35, and the strength of the connecting structure and the tolerance requirement of the shackle pin shaft are guaranteed by adopting a mode of flitch plates on two sides.
4. A tension balancing system according to claim 1, wherein: the total length of the tension balance anchor chain is about 90 meters, and DNVGL-OS-E302R 4 grade material is adopted.
5. A tension balancing system according to claim 1, wherein: the deepwater suction pile is made of API 2H Gr 50 materials, the diameter is 5m, the pile length is 20m, and the mud penetration depth is 19 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680821.4A CN113718754A (en) | 2021-06-18 | 2021-06-18 | Tension balancing system arranged at bottom of vertical pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680821.4A CN113718754A (en) | 2021-06-18 | 2021-06-18 | Tension balancing system arranged at bottom of vertical pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113718754A true CN113718754A (en) | 2021-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110680821.4A Pending CN113718754A (en) | 2021-06-18 | 2021-06-18 | Tension balancing system arranged at bottom of vertical pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113718754A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8016521B1 (en) * | 2009-01-22 | 2011-09-13 | Kahn Offshore, B.V. | Method for deploying a deepwater mooring spread |
| US20120266800A1 (en) * | 2009-04-30 | 2012-10-25 | Technip France | Spar mooring line sharing method and system |
| CN105992729A (en) * | 2013-10-25 | 2016-10-05 | 伊代奥尔公司 | Anchor chain |
| CN107013743A (en) * | 2017-04-24 | 2017-08-04 | 海洋石油工程股份有限公司 | Deep water hydrocarbon platform steel catenary riser installation method |
| US20200003025A1 (en) * | 2017-02-03 | 2020-01-02 | Trendsetter Vulcan Offshore, Inc. | Systems and methods for tethering a subsea structure |
-
2021
- 2021-06-18 CN CN202110680821.4A patent/CN113718754A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8016521B1 (en) * | 2009-01-22 | 2011-09-13 | Kahn Offshore, B.V. | Method for deploying a deepwater mooring spread |
| US20120266800A1 (en) * | 2009-04-30 | 2012-10-25 | Technip France | Spar mooring line sharing method and system |
| CN105992729A (en) * | 2013-10-25 | 2016-10-05 | 伊代奥尔公司 | Anchor chain |
| US20200003025A1 (en) * | 2017-02-03 | 2020-01-02 | Trendsetter Vulcan Offshore, Inc. | Systems and methods for tethering a subsea structure |
| CN107013743A (en) * | 2017-04-24 | 2017-08-04 | 海洋石油工程股份有限公司 | Deep water hydrocarbon platform steel catenary riser installation method |
Non-Patent Citations (1)
| Title |
|---|
| 刘润等: "深海管道轴向定向移动消减方案研究", 《海洋科学》 * |
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Application publication date: 20211130 |