CN110155262B - Trunk tree semi-submersible platform with self-installation function - Google Patents
Trunk tree semi-submersible platform with self-installation function Download PDFInfo
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- CN110155262B CN110155262B CN201910479887.XA CN201910479887A CN110155262B CN 110155262 B CN110155262 B CN 110155262B CN 201910479887 A CN201910479887 A CN 201910479887A CN 110155262 B CN110155262 B CN 110155262B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
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Abstract
The invention discloses a dry tree semi-submersible platform with a self-installation function. The dry tree semi-submersible platform comprises a platform hull; the platform hull sequentially comprises an upper deck, a lower buoyancy tank and a heave plate from top to bottom; 4 columns are used for supporting the upper deck and the lower floating box; the upright post is fixedly connected with the lower floating box; the upright post can vertically slide along the upper deck, and the top of the upright post is fixedly connected with the upper deck; the lower buoyancy tank is connected with the heave plate through a mooring cable; a ballast tank is arranged in the lower floating box. The dry tree semi-submersible platform has the advantages that: the topside module and platform hull can be integrally constructed at a dock or dock without the need for a folded installation of the topside module and hull. The total gravity center of the platform is lower after the platform is built, and the transportation of dry towing is facilitated. The bottom of the platform is provided with a heave plate, so that the heave motion performance can be improved, and the dry tree oil extraction is realized. The mooring rope can be connected back by adopting the self crane of the platform, the pretension of the mooring rope is generated by the self weight of the heave plate, and the platform does not need an anchor machine.
Description
Technical Field
The invention relates to a dry tree semi-submersible platform with a self-installation function, and belongs to the technical field of ocean engineering.
Background
The semi-submersible production platform has good wave resistance, large deck area and wide range of water depth, and is an ideal platform type for developing deep and far sea oil and gas fields. The semi-submersible platform is deep in draught, the upper module and the platform hull are built in a split building mode, then the folding is completed in an integral hoisting or offshore hoisting mode, and the mooring system is connected back by an installation ship. The traditional method has complex process flow, has higher requirements on construction sites and ship resources, and has cost occupying a large proportion of the total development investment of the platform, so that a large amount of deepwater and marginal oil fields cannot be effectively developed, and the popularization and application of the platform are limited.
In order to solve the above problems, in recent years, the ocean engineering industry has proposed many new concepts of semi-submersible platforms, and the main directions are to simplify the construction and installation process of the construction platform and optimize the motion performance of the platform, so as to realize the dry tree oil extraction mode of the TLP or Spar platform.
Disclosure of Invention
The invention aims to provide a dry tree semi-submersible platform with a self-installation function, which is suitable for deepwater and marginal oil fields.
The invention provides a dry tree semi-submersible platform with a self-installation function, which comprises a platform hull;
the platform hull sequentially comprises an upper deck, a lower buoyancy tank and a heave plate from top to bottom;
the upper deck and the lower buoyancy tank are supported by 4 upright posts;
the upright post is fixedly connected with the lower floating box;
the upright post can vertically slide along the upper deck, and the top of the upright post is fixedly connected with the upper deck;
the lower buoyancy tank is connected with the heave plate through a mooring cable;
a ballast tank is arranged in the lower floating box.
In the dry tree semi-submersible platform, an oil-gas treatment module is arranged on the upper deck, a moon pool is arranged in the middle of the lower buoyancy tank, and a vertical pipe system is arranged through the moon pool;
the upper deck may be an upper box deck.
In the above semi-submersible platform for dry trees, the upright posts and the lower buoyancy tank are welded and fixed, so as to form rigid fixation.
In the above-mentioned tree semi-submersible platform, a wedge block is arranged on the upper deck at the joint between the upper deck and the upright column, and is used for tightly holding the upright column.
In the dry tree semi-submersible platform, the inner part of the upper deck is provided with the bolt device, the top of the upright post is provided with the pin hole matched with the bolt device, and the upright post and the upper deck are fixed by adopting a bolt mode.
In the dry tree semi-submersible platform, mooring cable joints are arranged around the heave plate and are used for connecting mooring cables positioned on the platform hull.
In the semi-submersible type platform for the dry trees, the cable guider is arranged around the lower buoyancy tank.
In the above-mentioned dry tree semi-submersible platform, the mooring line portion on the hull of the platform is connected with the external mooring line portion by a quick connect coupling.
In the dry tree semi-submersible platform, a crane is arranged on the upper deck and used for recovering the buoyancy block of the mooring rope and connecting the mooring rope by using the quick connecting joint.
In the dry tree semi-submersible platform, a seawater lift pump is arranged on the upper deck and used for ballasting and discharging ballast tanks in the lower buoyancy tank.
In the dry tree semi-submersible platform, the heave plate is provided with a water inlet valve for injecting water into the heave plate.
The self-installation process of the tree-trunk semi-submersible platform comprises the following steps:
after the mooring system is installed in a pre-installation mode, the top of the mooring line is fixed by a temporary buoy, and then the platform is in place in a wet-towing mode. A crane on the platform is adopted to recover the buoyancy block of the mooring cable, and a box-type deck on the upper part of the platform is connected with a quick connector. And then removing the buoyancy block to finish the temporary mooring of the platform. And then the upright post and the upper box-type deck are released from constraint, a seawater lifting pump on the platform is adopted to ballast a ballast tank in the lower floating box until the lower floating box is ballasted to a specified depth, and then the upright post and the upper ship body are fixed in a bolt mode. And (4) discharging the ballast tank in the lower hull by using the seawater lifting pump again until the lower hull floats to the specified draft, and the box-type deck on the upper part of the platform rises to the given elevation above the water surface. Then, a water inlet valve on the heave plate is opened, the heave plate sinks under the action of gravity, the mooring rope is gradually tightened and generates constant pretension, and then the cable guide is locked to finish the platform installation.
Compared with the traditional semi-submersible production platform, the dry tree semi-submersible platform has the main advantages that:
(1) the topside module and platform hull can be integrally constructed at a dock or dock without the need for a folded installation of the topside module and hull.
(2) The total gravity center of the platform is lower after the platform is built, and the transportation of dry towing is facilitated.
(3) The bottom of the platform is provided with a heave plate, so that the heave motion performance can be improved, and the dry tree oil extraction is realized.
(4) The mooring rope can be connected back by adopting the self crane of the platform, the pretension of the mooring rope is generated by the self weight of the heave plate, and the platform does not need an anchor machine.
Drawings
FIG. 1 is a three-dimensional schematic view of the dry tree semi-submersible platform of the present invention as a whole.
FIG. 2 is a schematic illustration of the dry tree semi-submersible in place of the present invention.
Fig. 3 is a schematic illustration of a dry tree semi-submersible platform mooring line connection of the present invention.
FIG. 4 is a schematic diagram of the semi-submersible platform for mooring and positioning of the dry tree of the present invention.
FIG. 5 is a schematic view of the column and the lower buoyancy tank of the semi-submersible dry tree platform of the present invention sinking.
FIG. 6 is a schematic diagram of the dry tree semi-submersible platform of the present invention showing the overall floating.
FIG. 7 is a schematic drawing of the heave plate lowering of the tree semi-submersible of the present invention.
The respective symbols in the figure are as follows:
1, an oil gas treatment module; 2 an upper box deck; 3, upright posts; 4, a lower buoyancy tank; 5, tightly holding the wedge block by the upright post; 6, hoisting a machine; 7 heave plate; 8, mounting a mooring cable; 9 a platform mooring line; 10 quick connect coupling; 11 a water inlet valve; 12 a cable guide; 13 a cable connector; 14 heave plate; 15, a moon pool; 16 riser system.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Fig. 1 is a three-dimensional schematic diagram of the whole dry tree semi-submersible platform, mooring system and riser system according to the present invention. The platform hull sequentially comprises an upper box-type deck 2, a lower floating box 4 and a heaving plate 7 from top to bottom, the length and width of the upper box-type deck 2 and the length and width of the lower floating box 4 are both 50 meters, the height of the upper box-type deck 2 is 10 meters, an oil-gas treatment module is arranged on the upper box-type deck 2, a 15-meter square moon pool 15 is arranged in the middle of the lower floating box 4, and a riser system 16 is arranged in the moon pool 15. Support by 4 stands 3 between upper portion box deck 2 and the lower flotation tank 4, the diameter of stand 3 is 8 meters, its lower extreme and 4 rigid fixation of lower flotation tank, the inside ballast tank that is equipped with of lower flotation tank 4, its periphery is equipped with 4 fairleads 12, and 4 circular trompils are left in 2 four corners on the box deck of upper portion, stand 3 can carry out vertical slip along the trompil, it embraces voussoir 5 to be equipped with the stand in the junction of upper portion box deck 2 and stand 3 on upper portion box deck 2 for hugging closely stand 3, the inside on the box deck 2 of upper portion is equipped with bolt device (not shown in the figure), be equipped with on the top of stand 3 with bolt device complex pinhole (not shown in the figure), adopt the bolt mode to realize fixing between stand 3 and the box deck 2 of upper portion promptly.
In the invention, the heaving plate 7 has the self weight of about 2000 tons, is positioned at the lower part of the lower floating box 4, the interior of the heaving plate is an empty cabin, a water inlet valve 11 on the heaving plate 7 is provided with 4 cable connectors 13 on the periphery and is connected with the platform mooring cable 9.
In the invention, the mooring system adopts a pre-installation form, the tail end of the installation mooring cable 8 is provided with a quick connecting joint 10, and the platform mooring cable 9 bypasses a cable guider 12 and is connected with the installation mooring cable 8 by adopting the quick connecting joint 10. Two cranes 6 and seawater lift pumps (not shown) are provided on the upper box deck, and ballast discharge adjustment can be performed for the ballast tanks inside the lower buoyancy tank 4.
The self-installation of the tree trunk semi-submersible platform comprises the following steps:
step 1: the installation mooring line 8 is installed in a pre-installation mode and is temporarily fixed by a buoyancy block. The platform is entirely wet-towed in place as shown in fig. 2.
Step 2: the crane 6 is used for recovering and installing the buoyancy block at the top of the mooring cable 8, and a quick connector 10 is connected to the deck of the box-type deck 2 on the upper part of the platform, as shown in figure 3.
And step 3: the buoyancy block on the installation mooring line 8 is removed and the platform is temporarily moored as shown in figure 4.
And 4, step 4: the stand 3 and the stand on platform upper portion box deck 2 hold the voussoir 5 and disengage, the inside bolt of platform upper portion box deck 2 is extracted, stand 3 and the restraint of disengaging of platform upper portion box deck 2, later adopt the sea water elevator pump to pour into the sea water in the buoyancy tank 4 under the platform, buoyancy tank 4 ballast is to appointed degree of depth under the platform, later platform upper portion box deck 2 adopts the bolt mode to fix with stand 3, as shown in fig. 5.
And 5: seawater in the lower buoyancy tank 4 of the platform is discharged by a seawater lift pump, and the whole platform is discharged and floats to a specified draft, as shown in fig. 6.
Step 6: the water inlet valve 11 on the heave plate 14 is opened, the heave plate 14 is disengaged from the lower buoyancy tank 4 and descends, and the mooring rope is automatically tensioned to the designed pretension. The fairlead 12 is then locked and installation is complete, as shown in FIG. 7.
Claims (10)
1. A dry tree semi-submersible platform with self-installation function comprises a platform hull;
the platform hull sequentially comprises an upper deck, a lower buoyancy tank and a heave plate from top to bottom;
the upper deck and the lower buoyancy tank are supported by 4 upright posts;
the upright post is fixedly connected with the lower floating box;
the upright post can vertically slide along the upper deck, and the top of the upright post is movably connected with the upper deck;
the lower buoyancy tank is connected with the heave plate through a mooring cable;
a ballast tank is arranged in the lower floating box.
2. The dry tree semi-submersible platform of claim 1, wherein: the upright post and the lower buoyancy tank are welded and fixed.
3. The dry tree semi-submersible platform of claim 1 or 2, wherein: and wedge blocks are arranged on the upper deck at the joint of the upper deck and the upright post.
4. The dry tree semi-submersible platform of claim 3, wherein: the inside on upper portion deck is equipped with bolt device, be equipped with on the top of stand with bolt device complex pinhole according to claim 3 dry tree semi-submerged formula platform, its characterized in that: the inside of upper portion deck is equipped with bolt device, be equipped with on the top of stand with bolt device complex pinhole.
5. The dry tree semi-submersible platform of claim 4, wherein: mooring rope joints are arranged around the heave plate.
6. The dry tree semi-submersible platform of claim 5, wherein: and cable guides are arranged around the lower buoyancy tank.
7. The dry tree semi-submersible platform of claim 6, wherein: the mooring line portions on the platform hull are connected to external mooring line portions by quick connect joints.
8. The dry tree semi-submersible platform of claim 7, wherein: and a crane is arranged on the upper deck.
9. The dry tree semi-submersible platform of claim 8, wherein: and a seawater lifting pump is arranged on the upper deck.
10. The dry tree semi-submersible platform of claim 9, wherein: the heaving plate is provided with a water inlet valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910479887.XA CN110155262B (en) | 2019-06-04 | 2019-06-04 | Trunk tree semi-submersible platform with self-installation function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910479887.XA CN110155262B (en) | 2019-06-04 | 2019-06-04 | Trunk tree semi-submersible platform with self-installation function |
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| CN110155262A CN110155262A (en) | 2019-08-23 |
| CN110155262B true CN110155262B (en) | 2020-03-03 |
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| CN201910479887.XA Active CN110155262B (en) | 2019-06-04 | 2019-06-04 | Trunk tree semi-submersible platform with self-installation function |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439347B (en) * | 2020-04-20 | 2020-10-27 | 中海油研究总院有限责任公司 | Self-installation single-upright-column platform and installation method thereof |
| CN112900405A (en) * | 2021-01-20 | 2021-06-04 | 长江勘测规划设计研究有限责任公司 | Mooring system applied to port water surface prefabricated platform and construction method |
| CN113148039B (en) * | 2021-04-17 | 2023-05-30 | 哈尔滨工业大学（深圳） | Modularized ultra-large floating platform |
| CN114537604B (en) * | 2022-01-13 | 2023-12-22 | 东北石油大学 | Anchor-pulling type foundation platform of assembled FRP concrete combined rope pulling tower and construction method thereof |
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| WO2011137061A1 (en) * | 2010-04-26 | 2011-11-03 | Aker Field Development Inc. | Dry-tree semi-submersible production and drilling unit |
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