CN117628271A - Diving tie-back method for dynamic flexible vertical pipe and PLET - Google Patents
Diving tie-back method for dynamic flexible vertical pipe and PLET Download PDFInfo
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- CN117628271A CN117628271A CN202311730520.3A CN202311730520A CN117628271A CN 117628271 A CN117628271 A CN 117628271A CN 202311730520 A CN202311730520 A CN 202311730520A CN 117628271 A CN117628271 A CN 117628271A
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- dynamic flexible
- plet
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- vertical pipe
- tie
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000009189 diving Effects 0.000 title claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000007667 floating Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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Abstract
The invention discloses a submersible tie-back method for a dynamic flexible vertical pipe and a PLET, which comprises the following steps: connecting the end head of the dynamic flexible vertical pipe with the balancing weight to wet the seabed; completing the connection and arrangement of the back-up rigging and transferring the dynamic flexible riser end head from the balancing weight rigging to the lifting rigging; connecting the rigging between the PLET top lifting lug and the reserved rigging on the dynamic flexible riser; transmitting the limiting force of the dynamic flexible vertical pipe to a reserved rigging; and (3) pulling the tail end of the dynamic flexible vertical pipe to a PLET top flange through a plurality of groups of chain blocks arranged at the top of the PLET, and fastening bolts to complete the integral tie-back PLET work of the dynamic flexible vertical pipe. According to the invention, the tie-back reserved rigging is made on the dynamic flexible riser in advance when the dynamic flexible riser is paved, the end head of the dynamic flexible riser is transferred to the tie-back position above the PLET, and the pairing and subsequent correlation test are completed, so that the construction difficulty is reduced, and the construction risk is reduced.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a submersible tie-back method for a dynamic flexible vertical pipe and a PLET.
Background
At present, in the ocean engineering technology, a dynamic flexible riser is generally used for connecting an upper FPSO (floating storage and offloading) with an underwater PLET (hydraulic fluid storage and offloading), and the underwater dynamic riser tie-back PLET of a saturated diver plays a crucial role in the connection work in a deepwater environment.
Disclosure of Invention
The invention aims to provide a submersible tie-back method for a dynamic flexible riser and a PLET, which is characterized in that tie-back reserved rigging is made on the riser in advance when the dynamic flexible riser is paved, the end head of the dynamic flexible riser is transferred to the tie-back position above the PLET, and the pairing and subsequent relevance test are completed, so that the construction difficulty is reduced, and the construction risk is reduced.
In order to achieve the purpose of the invention, the invention provides a diving tie-back method for a dynamic flexible riser and a PLET, which comprises the following steps:
s1, connecting the end head of a dynamic flexible vertical pipe with a balancing weight to wet the sea floor before the dynamic flexible vertical pipe is ready to be tiebased;
s2, an operation ship crane assists a saturated diver to complete connection and arrangement of a loop-back rigging, and the tail end of the dynamic flexible vertical pipe is transferred from a balancing weight rigging to a lifting rigging, and the lifting rigging slowly pulls the tail end of the dynamic flexible vertical pipe to the top of the PLET;
s3, connecting rigging by a diver between the PLET top lifting lug and the reserved rigging on the dynamic flexible vertical pipe;
s4, slowly releasing the lifting rigging, and transmitting the limiting force of the dynamic flexible vertical pipe to the reserved rigging;
s5, dismantling the lifting rigging, dismantling and recycling a pulling head connected to the lifting rigging, and preparing the dynamic flexible riser flange tieback operation;
s6, slowly pulling the tail end of the dynamic flexible vertical pipe to the flange at the top of the PLET through a plurality of groups of chain blocks arranged at the top of the PLET, fastening bolts, and removing the chain blocks after the completion;
s7, the diver removes the relevant rigging, the crane is used for assisting in recycling the balancing weight and the relevant rigging to the deck of the operation ship, and the overall tie-back PLET work of the dynamic flexible vertical pipe is completed.
As a preferable technical scheme of the invention, in the step S2, one end of the lifting rope is connected with the tail end of the dynamic flexible vertical pipe, the other end of the lifting rope penetrates through the lifting lug at the top of the PLET and is connected with a power source, the power source pulls the lifting rope, and the lifting rope slowly pulls the tail end of the dynamic flexible vertical pipe to the top of the PLET after being stressed.
As the preferable technical scheme of the invention, the power source is a buoyancy bag and/or a crane lifting steel wire rope.
As a preferred technical solution of the present invention, in step S3, after the connection of the reserved rigging between the PLET top lifting lug and the dynamic flexible riser is completed, the rigging connection point of the balancing weight is transferred from the dynamic flexible riser end head to the spare safety rigging at the dynamic flexible riser side end.
As a preferable technical scheme of the invention, in step S5, a diver installs a floating bag on the PLET top flange blind plate, and the diver removes the blind plate and recovers the blind plate; the diver removes the drag head of the dynamic flexible riser, installs a buoyancy bag on the drag head, removes the drag head and recovers.
As a preferable technical scheme of the invention, in the step S6, a diver installs the chain block to a bolt hole of a flange at the tail end of the dynamic flexible riser, the diver adjusts the chain block to conduct flange assembly of the dynamic flexible riser and the PLET, when the flanges of the dynamic flexible riser and the PLET are about to be overlapped, a positioning steel drill is inserted, the flange assembly is adjusted, a bolt is inserted, a saturated diver conducts bolt fastening according to design requirements, and the chain block is removed after completion.
As a preferred technical solution of the present invention, the design requirements of the bolt fastening include: and (3) installing a bolt stretcher, pressurizing to 10% stretching pressure, checking whether a stretching head is activated or has leakage, gradually pressurizing from 25%, 50% and 75% to 100% stretching pressure according to a stretching program, recording values, and completing the back pressure test.
Compared with the prior art, the invention provides a diving tie-back method for a dynamic flexible vertical pipe and a PLET, which has the following beneficial effects:
according to the invention, the tie-back reserved rigging is made on the dynamic flexible riser in advance when the dynamic flexible riser is paved, the end head of the dynamic flexible riser is transferred to the tie-back position above the PLET, and the pairing and subsequent correlation test are completed, so that the construction difficulty is reduced, and the construction risk is reduced.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic view of the dynamic flexible riser wet storage of the present invention;
FIG. 3 is a schematic view of a traction dynamic flexible riser of the lift cable of the present invention;
FIG. 4 is a schematic diagram of a dynamic flexible riser and PLET flange set of the invention;
FIG. 5 is a working schematic diagram of the chain block of the invention.
The dynamic flexible vertical pipe is 1, the balancing weight is 2, the lifting rigging is 3, the PLET is 4, the reserved rigging is 5, the chain block is 6, and the standby safety rigging is 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, an embodiment of the present invention provides a method for tieing a dynamic flexible riser with a PLET, comprising the steps of:
s1, connecting the end head of a dynamic flexible vertical pipe 1 with a balancing weight 2 to wet the sea floor before the dynamic flexible vertical pipe 1 is ready for tie-back;
s2, an operation ship crane assists a saturated diver to complete connection and arrangement of a back-up rigging, and the tail end of the dynamic flexible vertical pipe 1 is transferred from a balancing weight rigging to a lifting rigging 3, and the lifting rigging 3 slowly pulls the tail end of the dynamic flexible vertical pipe 1 to the top of the PLET 4;
s3, connecting rigging between the top lifting lug of the PLET4 and the reserved rigging 5 on the dynamic flexible vertical pipe 1 by a diver;
s4, slowly releasing the lifting rigging 3, and transmitting the limiting force of the dynamic flexible vertical pipe 1 to the reserved rigging 5;
s5, dismantling the lifting cable tool 3, dismantling and recovering a pulling head connected to the lifting cable tool 3, and preparing for flange tieback operation of the dynamic flexible vertical pipe 1;
s6, slowly pulling the tail end of the dynamic flexible vertical pipe 1 to a flange at the top of the PLET4 through a plurality of groups of chain blocks 6 arranged at the top of the PLET4, fastening bolts, and removing the chain blocks after the completion;
s7, the diver removes the relevant rigging, the crane is used for assisting in recycling the balancing weight 2 and the relevant rigging to the deck of the operation ship, and the overall tie-back PLET work of the dynamic flexible vertical pipe is completed.
In one embodiment of the present invention, in step S2, one end of the lifting rope 3 is connected to the end of the dynamic flexible riser 1, and the other end of the lifting rope 3 passes through the top lifting lug of the PLET4 and is connected to a power source, the power source pulls the lifting rope 3, and the lifting rope 3 slowly pulls the end of the dynamic flexible riser 1 to the top of the PLET4 after being stressed.
In one embodiment of the invention, the power source is a buoyancy bag and/or crane lifting wire rope.
In one embodiment of the present invention, after the connection of the reserved rigging 5 between the top lifting lug of the PLET4 and the dynamic flexible riser 1 is completed in step S3, the rigging connection point of the counterweight 2 is transferred from the end head of the dynamic flexible riser 1 to the reserved safety rigging 7 at the side end of the dynamic flexible riser 1.
In one embodiment of the invention, in step S5, a diver installs a float bag on the PLET4 top flange blind plate, and the diver removes the blind plate and recovers; the diver removes the drag head of the dynamic flexible riser 1, installs a buoyancy bag on the drag head, removes the drag head and recovers.
In one embodiment of the present invention, in step S6, a diver installs the chain block 6 in the bolt hole of the end flange of the dynamic flexible riser 1, adjusts the chain block 6 to perform the flange set of the dynamic flexible riser 1 and the PLET4, inserts a positioning steel drill when the flanges of the dynamic flexible riser 1 and the PLET4 are about to overlap, adjusts the flange set, inserts a bolt, and a saturated diver performs bolt fastening according to design requirements, and removes the chain block 6 after completion.
In one embodiment of the present invention, the design requirements of the bolt tightening include: and (3) installing a bolt stretcher, pressurizing to 10% stretching pressure, checking whether a stretching head is activated or has leakage, gradually pressurizing from 25%, 50% and 75% to 100% stretching pressure according to a stretching program, recording values, and completing the back pressure test.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (7)
1. A method of tieback diving a dynamic flexible riser with a PLET, comprising the steps of:
s1, connecting the end head of a dynamic flexible vertical pipe (1) with a balancing weight (2) to wet the seabed before the dynamic flexible vertical pipe (1) is ready for tie-back;
s2, an operation ship crane assists a saturated diver to complete connection and arrangement of a back-up rigging, the tail end of the dynamic flexible vertical pipe (1) is transferred from a balancing weight rigging to a lifting rope (3), and the lifting rope (3) slowly pulls the tail end of the dynamic flexible vertical pipe (1) to the top of the PLET (4);
s3, connecting rigging between the top lifting lug of the PLET (4) and the reserved rigging (5) on the dynamic flexible vertical pipe (1) by a diver;
s4, slowly releasing the lifting rigging (3) and transmitting the limiting force of the dynamic flexible vertical pipe (1) to the reserved rigging (5);
s5, dismantling the lifting rigging (3), dismantling and recycling a pulling head connected to the lifting rigging (3), and preparing the flange tieback operation of the dynamic flexible vertical pipe (1);
s6, slowly pulling the tail end of the dynamic flexible vertical pipe (1) to a flange at the top of the PLET (4) through a plurality of groups of chain blocks (6) arranged at the top of the PLET (4), fastening bolts, and removing the chain blocks after the completion;
s7, the diver removes the relevant rigging, the crane is used for assisting in recycling the balancing weight (2) and the relevant rigging to the deck of the operation ship, and the overall tie-back PLET work of the dynamic flexible vertical pipe is completed.
2. The method of submersible tie-back of a dynamic flexible riser to a PLET of claim 1, wherein:
in step S2, one end of the lifting rope (3) is connected to the end head of the end of the dynamic flexible riser (1), the other end of the lifting rope (3) passes through the top lifting lug of the PLET (4) and then is connected with a power source, the power source pulls the lifting rope (3), and the end head of the dynamic flexible riser (1) is slowly pulled to the top of the PLET (4) after the lifting rope (3) is stressed.
3. A method of submersible tie-back of a dynamic flexible riser to a PLET according to claim 2, characterized by:
the power source is a floating bag and/or a lifting steel wire rope of the crane.
4. The method of submersible tie-back of a dynamic flexible riser to a PLET of claim 1, wherein:
in step S3, after the connection of the reserved rigging (5) between the top lifting lug of the PLET (4) and the dynamic flexible riser (1) is completed, the rigging connection point of the balancing weight (2) is transferred from the terminal end of the dynamic flexible riser (1) to the spare safety rigging (7) at the side end of the dynamic flexible riser (1).
5. The method of submersible tie-back of a dynamic flexible riser to a PLET of claim 1, wherein:
in step S5, the diver installs a floating bag on the blind plate of the flange at the top of the PLET (4), and the diver removes the blind plate and recovers the blind plate; the diver removes the drag head of the dynamic flexible riser (1), installs a buoyancy bag on the drag head, removes the drag head and recovers.
6. The method of submersible tie-back of a dynamic flexible riser to a PLET of claim 1, wherein:
in step S6, the diver installs chain block (6) to the bolt hole of dynamic flexible riser (1) terminal flange, diver adjustment chain block (6) go on dynamic flexible riser (1) with the flange group of PLET (4) is right when the flange of dynamic flexible riser (1) with PLET (4) is about to coincide, inserts the location drill steel, and adjustment flange group is right, inserts the bolt, and saturated diver carries out the bolt fastening according to the design requirement, demolishs after accomplishing chain block (6).
7. The method of submersible tie-back of a dynamic flexible riser to a PLET of claim 6, further comprising:
the design requirements of the bolt fastening include: and (3) installing a bolt stretcher, pressurizing to 10% stretching pressure, checking whether a stretching head is activated or has leakage, gradually pressurizing from 25%, 50% and 75% to 100% stretching pressure according to a stretching program, recording values, and completing the back pressure test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311730520.3A CN117628271A (en) | 2023-12-15 | 2023-12-15 | Diving tie-back method for dynamic flexible vertical pipe and PLET |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311730520.3A CN117628271A (en) | 2023-12-15 | 2023-12-15 | Diving tie-back method for dynamic flexible vertical pipe and PLET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117628271A true CN117628271A (en) | 2024-03-01 |
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ID=90032128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311730520.3A Pending CN117628271A (en) | 2023-12-15 | 2023-12-15 | Diving tie-back method for dynamic flexible vertical pipe and PLET |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117628271A (en) |
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2023
- 2023-12-15 CN CN202311730520.3A patent/CN117628271A/en active Pending
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