CN107725000A - Upper part block of offshore platform with flare boom and its towage Fatigue Damage Calculation method - Google Patents
Upper part block of offshore platform with flare boom and its towage Fatigue Damage Calculation method Download PDFInfo
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- CN107725000A CN107725000A CN201711120932.XA CN201711120932A CN107725000A CN 107725000 A CN107725000 A CN 107725000A CN 201711120932 A CN201711120932 A CN 201711120932A CN 107725000 A CN107725000 A CN 107725000A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 6
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- 238000010586 diagram Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 9
- 230000035772 mutation Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
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- 210000001503 joint Anatomy 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Classifications
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- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0004—Nodal points
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0039—Methods for placing the offshore structure
- E02B2017/0047—Methods for placing the offshore structure using a barge
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/04—Ageing analysis or optimisation against ageing
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Abstract
The present invention relates to a kind of upper part block of offshore platform with flare boom and its towage Fatigue Damage Calculation method, and the former includes upper chunk and is fixedly connected on the flare boom of the side of upper chunk；One end that flare boom is connected with upper chunk is provided with changeover portion, and transition section structure uses the parallel chord truss structure type that cross section gradually increases, and cross section maximum is the support connecting portion with upper chunk.The present invention is used as changeover portion using the parallel chord truss structure that cross section gradually increases, the structure of flare boom bottom can be strengthened, flare boom is formed the structure for being gradually transitions weak body by rigid body after being connected with upper chunk, avoid rigidity from being mutated, improve the ability for resisting fatigue load；It is achieved in integrated connection construction on land, the upper chunk whole Transporting with flare boom connected as one is in place to Attention problems, so as to avoid the various problems that lifting group centering at sea runs into, and the various problems that the connection group of flare boom and upper chunk occurs to during.
Description
Technical field
The present invention relates to a kind of upper part block of offshore platform with flare boom and its towage Fatigue Damage Calculation method, belong to
Offshore platform technical field.
Background technology
At present, in each offshore platform structure design, the flare boom of wellhead platform upper chunk is separately designed with chunk
And construction, assemble again during Attention problems.Bohai environment condition preferably and marine transportation distance it is shorter, past platform is inclined in addition
Small, upper chunk weight is also relatively light, implements and has no too big difficulty.Then differ widely in the East Sea, its environmental condition
Badly, platform military service site causes offshore construction scheme performance difficulty, reliability and operability poor away from bank base, with
And economy is bad.
In addition, flare boom also has certain difficulty and risk during assembling is at sea docked with upper chunk.Such as
Shown in Fig. 1~4, at present, upper chunk carries the offshore platform of flare boom, and its flare boom 3 and the connection of upper chunk 4 are adopted mostly
With bikini connected mode, wherein, 2 points of upper end with transverse axis neck " hook " by pulling force effect, the lower sustainer effect of being stressed.
Before flare boom is connected installation with upper chunk, upper chunk is at sea installed in place on platform base jacket first,
Then flare boom is lifted again is attached installation with upper chunk.This mount scheme needs to overcome two big difficulties：(1) upper group
The welding procedure problem of coupling hook on block：Due to small volume, steel plate compared with it is thick, welding capacity is big, easily there is postwelding in postwelding
Crackle.If constructed under the conditions of catching up with winter low temperature, the hook combined by steel plate constructs welding layer by layer, and its high-altitude postwelding is carried out
Heat treatment carries out nondestructive testing again, i.e., difficult to expend the time again, the construction period is difficult to ensure that.(2) due to the environmental condition in the East Sea
Badly, the tens of tons of flare boom of offshore lifting smoothly hangs over the extension of two flutings with the hanging nose of two transverse axis (or connection)
It is very difficult on hook：One wants the integral hoisting state of leveling flare boom, and two will wait ship and hanging object appearance one relatively steady
Fixed state, decidedly hang up to succeed in addition, and can not break the rod member or section of structure because of waving for hanging object
Point.
Also there are the offshore platform (as shown in Fig. 5~7) that part carries flare boom, its flare boom 5 and the connection of upper chunk 6
Using the connecting structure of hanging nose formula.This kind of arrangement and method for construction, it is also desirable to first by the Attention problems of upper chunk 6 it is in place after, then hang torch
Arm 5 puts into row assembling with upper chunk 6.This mode due to the excessively compact insufficient rigidity in addition of connection member its in East Sea operation
Suitable cost can be paid.
So, why all the time flare boom and upper chunk all by the way of installation is transported respectivelyStudy carefully its root
Source, in the calculating analysis of marine towage transport is combined for flare boom and upper chunk, fatigue mechanisms analysis does not have
Have and reasonably solved, especially East Sea harsh environmental conditions and need to platform military service site the fortune of long range from base is built
Defeated voyage.
The content of the invention
In view of the above-mentioned problems, it disclosure satisfy that East Sea environment it is an object of the present invention to provide a kind of rigidity and avoid in sea
On carry out lift installation the upper part block of offshore platform with flare boom.
It is a further object to provide a kind of towage fatigue damage of the upper part block of offshore platform with flare boom
Computational methods, this method are that the marine transportation integrated with upper chunk of Area of The East China Sea flare boom establishes calculating analytical technology base
Plinth.
To achieve the above object, the present invention uses following technical scheme：A kind of upper part block of offshore platform with flare boom,
Flare boom including upper chunk He the side for being fixedly connected on the upper chunk；It is characterized in that：The flare boom and institute
The one end for stating upper chunk connection is provided with changeover portion, the parallel chord truss structure that the changeover portion is gradually increased using cross section and
Cross section maximum is the connecting portion with the upper chunk.
The changeover portion is that the upper chunk is wide with the flare boom width at the connecting portion of the upper chunk
The 50% of degree.
Four-point connected mode is used between the flare boom and the upper chunk, in the changeover portion of the flare boom
Connection end is provided with hanging nose, and the hook being engaged with hanging nose is set in the connecting side of the upper chunk.
A kind of towage transport Fatigue Damage Calculation method of upper part block of offshore platform with flare boom, including following step
Suddenly：1) barge is established in implementing hydrodynamic analysis software with the overall FEM model of upper chunk and flare boom, according to towage
Sea conditions and towage time are divided in detail to towage operating mode, draft the towage speed of a ship or plane, for each towage operating mode to barge
Frequency-domain analysis is carried out, response amplitude operator RAO of the upper chunk with flare boom overall structure center position is calculated；2) exist
Upper chunk is established in offshore engineering structure analysis software with the overall FEM model of flare boom, is dragged using what is carried in software
Navigate analysis of fatigue computing module, joins needed for input Calculation of Hydrodynamic result-RAO values, towage marine site wave scatter diagram, fatigue mechanisms
Amount, the spectrum fatigue mechanisms under towage comfortable property are carried out to chunk, obtain the fatigue damage of each node of flare boom.
Hydraulic analysis software employed in the step 1) is Moses.
Offshore engineering structure analysis software employed in the step 2) is SACS.
For the present invention due to taking above technical scheme, it has advantages below：1st, the present invention is in flare boom and upper chunk
Between using the parallel chord truss structure that cross section gradually increases as changeover portion, the structure of flare boom bottom can be strengthened so that fire
Torch arm forms the structure that weak body is gradually transitions by rigid body after being connected with upper chunk, so as to avoid the mutation of rigidity, improves
Resist the ability of fatigue load；Thus, the present invention can carry out integrated connection construction, including trial assembly on land.So as to pre-
First avoid the various problems at sea lifting and being run into flare boom installation process, and the assembling of flare boom and upper chunk
The various problems occurred in journey.Then by the upper chunk whole Transporting with flare boom connected as one to Attention problems just
Position.2nd, the workload at sea is effectively transferred to land to complete by the present invention, can be realized and maximumlly be compressed sea
Workload, using and play the natural quality and progress that facilitate condition to improve construction in land formation place.
Brief description of the drawings
The present invention is described in detail with reference to the accompanying drawings and examples.
Fig. 1 is the overall schematic front view that flare boom uses coupling type connected mode with upper chunk structure；
Fig. 2 is the overall schematic top plan view that flare boom uses coupling type connected mode with upper chunk structure；
Fig. 3 is the schematic diagram that existing lifting flare boom is assembled with upper chunk；
Fig. 4 is coupling type tie point structure section schematic diagram；
Fig. 5 is that flare boom uses hanging nose formula connected mode assembling schematic diagram with upper chunk；
Fig. 6 is the close-up schematic view of hanging nose formula connecting structure；
Fig. 7 is Fig. 6 schematic top plan view；
Fig. 8 is the main schematic diagram of structure of the upper part block of offshore platform of the invention with flare boom；
Fig. 9 is the structure schematic top plan view of the upper part block of offshore platform of the invention with flare boom；
Figure 10 is the calculating analysis process figure of the inventive method；
Figure 11 is upper chunk band flare boom entirety towage transport hydrodynamic model of the present invention；
Figure 12 is upper chunk band flare boom Integral Fatigue Analysis model (3D) of the present invention.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 8, Figure 9, the present invention proposes a kind of upper part block of offshore platform with flare boom, including upper chunk
1 and be fixedly connected on upper chunk 1 side the flare boom 2 in truss structure.Wherein, the truss structure of flare boom 2 and top
One end that chunk 1 connects is provided with changeover portion 7, the parallel chord truss structure that changeover portion 7 is gradually increased using cross section and cross section
The position of Breadth Maximum is the connecting portion with upper chunk 1.
Further, the width of changeover portion 7 and the flare boom 2 at the connecting portion of upper chunk 1 is the width of upper chunk 1
50%.
Further, four-point connected mode is used between flare boom 2 and upper chunk 1, is set in the connection end of changeover portion 7
Hanging nose is equipped with, the hook being engaged with hanging nose is set in the connecting side of upper chunk 1.
The present invention difference maximum with prior art has at 2 points：First, flare boom 2 passes through 1 group of changeover portion 7 and upper chunk
Be integrated and be designed (prior art is transported to using split and marine carries out lifting assembling again), second, flare boom 2 with
Changeover portion 7 is used as using the parallel chord truss structure that cross section gradually increases between upper chunk 1.The present invention solves of the prior art
The principle of problem is as follows：In the prior art why using flare boom and upper chunk distinguish towage transport install again by the way of,
Its reason is if in advance on land installed flare boom and upper chunk, because the rigidity of upper chunk is big and fiery
The rigidity of torch arm is weak to form variation in rigidity mutation, and this combining structure will be difficult in adapt to caused by the towage transport of long range
Towage load, the torch arm configuration inevitably structural fatigue problem during long-distance transportation.And the application passes through
Cross substantial amounts of calculating analysis and verification experimental verification, it is proposed that using the parallel chord truss structure that cross section gradually increases as changeover portion,
Strengthen the structure of the bottom of flare boom 2 so that after flare boom 2 is connected with upper chunk 1, formed be gradually transitions by rigid body it is weak
Body structure, there is the mutation of rigidity so as to avoid overall structure, improve the ability for resisting fatigue load.Therefore the present invention exists
Land carries out integrated connection construction, then pacifies the upper chunk whole Transporting with flare boom connected as one to sea
Dress is in place, ensure that the quality of assembling construction.It thus avoid the various problems run into lifting is installed, and flare boom 2
With there is the unexpected problem to happen suddenly in the connection procedure of upper chunk 1, operation on the sea construction workload and risk are reduced.
The present invention proposes a kind of towage Fatigue Damage Calculation method of upper part block of offshore platform with flare boom, including
Following steps：
1) barge is established in implementing hydrodynamic analysis software with the overall FEM model of upper chunk and flare boom, according to dragging
The defeated sea conditions of shipping and towage time are divided in detail to towage operating mode.The towage speed of a ship or plane is drafted, for each towage work
Condition carries out frequency-domain analysis to barge, and RAO (response of the upper chunk with flare boom overall structure center position is calculated
Amplitude operator, response amplitude operator).Its detailed process is as follows：
In frequency domain implementing hydrodynamic analysis, it is assumed that ship is time-invariant linear system, is only considered linear suffered by it
Seaway load, wave and ship motion are considered as ergodic stationary random process, and wave spectrum and barge response spectra are considered as arrowband
Spectrum, then by Fourier transformation, obtain the ship center of gravity frequency domain equation of motion：
Wherein, M is ship mass matrix, and m is ship additional mass matrix, and D is ship damping matrix, and C is ship rigidity
Matrix, F are frequency domain wave perturbed force, including Froude-Krylov power and diffraction force, ζaFor wave amplitude, X (t) is ship center of gravity position
Place's motor imagination is put, ω is wave frequencies.
When taking wave height ζa(t)=1, the above-mentioned equation of motion is solved, then structural response X*(ω, θ) is one to be based on wave
The complex vector of frequency and incident direction, this vector are referred to as response amplitude operator (RAO), i.e., structure is in wave frequencies ω and incidence
Direction θ, the response under the regular waves of unit wave amplitude.
Barge hydrodynamic model includes two parts of wet structure model and quality model.Wherein wet structure model is according to barge
Design parameter and each site type value, are established in Moses；Quality model is controlled again according to barge, and each several part quality is specified in Moses
Weight size and position of centre of gravity, be applied in a manner of lumped mass on model.Under towage operating mode, quality model removes Light Weight
Amount is outer, in addition to chunk weight, the steel weight of fixed, the attached barge reinforcement of shipment.
When being calculated, incident direction can be chosen as 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° etc.
Totally 8 waves are to wave period 3~30s of scope, analyzing the hydrodynamic force of above-mentioned barging.Wherein, 90 ° of directions of wave
Incidence is most dangerous working condition.Solve RAO value of the upper chunk with flare boom overall structure center position under each operating mode.
2) it is soft with the overall FEM model of flare boom, use that upper chunk is established in offshore engineering structure analysis software
The towage analysis of fatigue computing module carried in part, it is input Calculation of Hydrodynamic result-RAO values, towage marine site wave scatter diagram, tired
Parameter (SCF, S-N curve, wave spectrum etc.) needed for labor calculating, the spectrum fatigue mechanisms under towage operating mode are carried out to chunk, obtain fire
The fatigue damage of each node of torch arm.
, can be to flare boom fatigue with reference to the accumulative theory of fatigue damage after the fatigue damage of each node of flare boom is obtained
Life-span is further assessed.The sea proposed by the invention with flare boom is put down using Fatigue Damage Calculation method of the present invention
After platform upper chunk carries out calculating analysis, show that the structure of the invention flare boom under towage operating mode can be resisted under travel position
The load action of various operating modes, each node fatigue life are satisfied by code requirement.
In above-described embodiment, the hydraulic analysis software employed in step 1) is Moses.
In above-described embodiment, the offshore engineering structure analysis software employed in step 2) is SACS.Engineering
The SACS software systems of Dynamics companies exploitation, had for the structure of ocean platform and general land structure engineering design
Finite element analysis software systems, comprising multiple program modules, wherein towage fatigue module-" Tow Fatigue " are tired based on frequency domain
Labor analysis principle, Calculation of Hydrodynamic RAO is converted into inertial load suffered by structure, calculates jacket or upper chunk structure is being dragged
Under operating mode of navigating, due to fatigue damage caused by barge motion.
3 bolt-type connected modes are used when being installed between traditional torch arm configuration and upper chunk, take wave period model
It is 0~360 ° to enclose for 3~30s, interval 0.5s, wave direction angle, is spaced 45 °, and each pipe node fatigue damage of flare boom is calculated
Injure life value.Through calculating find, compared with platform fatigue damage in place, these node towage fatigue damage proportions compared with
Greatly.Therefore, in the case of upper chunk is with flare boom entirety towage, towage fatigue damage can not be ignored.Fatigue damage is larger
Pipe node focus primarily upon the link position of flare boom and chunk upper deck, on the one hand, because the opening position is whole torch
The root of arm, it is larger by moment of flexure caused by flare boom deadweight and other inertial loads compared with other pipe nodes, it is that transport load is made
With lower fatigue and the key position of damage.
In view of rigid very different between upper chunk and flare boom, the two junction just necessarily occurs that rigidity mutation is existing
As fatigue damage is more serious in long-distance transportation.For this problem, the application is connected in flare boom with upper chunk
One end is provided with changeover portion, and changeover portion uses the parallel chord truss structure that cross section gradually increases.Using above-mentioned same procedure to new
Type torch arm configuration carries out the fatigue mechanisms under overall towage operating mode, the results showed that, there is obvious reduction compared with traditional structure impairment value,
Almost the 1/100 of original structure Joint Damage.The structure is gradually transitions flexible body by rigid body, so as to avoid the mutation of rigidity
The influence brought, improve the ability for resisting marine transportation fatigue load.
The present invention is only illustrated with above-described embodiment, and structure, set location and its connection of each part are all to have
Changed, on the basis of technical solution of the present invention, all improvement carried out according to the principle of the invention to individual part and equivalent
Conversion, should not be excluded outside protection scope of the present invention.
Claims (6)
1. a kind of upper part block of offshore platform with flare boom, including upper chunk and it is fixedly connected on the one of the upper chunk
The flare boom of side；It is characterized in that：The flare boom is provided with changeover portion, the transition with one end that the upper chunk is connected
The parallel chord truss structure and cross section maximum that Duan Caiyong cross sections gradually increase are the connecting portion with the upper chunk.
2. the upper part block of offshore platform with flare boom as claimed in claim 1, it is characterised in that：The changeover portion with it is described
The flare boom width at the connecting portion of upper chunk is the 50% of the upper chunk width.
3. the upper part block of offshore platform with flare boom as claimed in claim 1, it is characterised in that：The flare boom with it is described
Four-point connected mode is used between upper chunk, the connection end of the changeover portion of the flare boom is provided with hanging nose, described
The connecting side of upper chunk sets the hook being engaged with hanging nose.
4. a kind of towage Fatigue Damage Calculation method of upper part block of offshore platform with flare boom, comprises the following steps：
1) barge is established in implementing hydrodynamic analysis software with the overall FEM model of upper chunk and flare boom, is transported according to towage
Defeated sea conditions and towage time are divided in detail to towage operating mode, draft the towage speed of a ship or plane, for each towage operating mode pair
Barge carries out frequency-domain analysis, and response amplitude operator RAO of the upper chunk with flare boom overall structure center position is calculated；
2) upper chunk is established in offshore engineering structure analysis software with the overall FEM model of flare boom, using in software
The towage analysis of fatigue computing module carried, input Calculation of Hydrodynamic result-RAO values, towage marine site wave scatter diagram, ponograp
Parameter needed for calculation, the spectrum fatigue mechanisms under towage operating mode are carried out to chunk, obtain the fatigue damage of each node of flare boom.
5. the towage Fatigue Damage Calculation method of the upper part block of offshore platform with flare boom as claimed in claim 4, it is special
Sign is：Hydraulic analysis software employed in the step 1) is Moses.
6. the towage Fatigue Damage Calculation method of the upper part block of offshore platform with flare boom as claimed in claim 4, it is special
Sign is：Offshore engineering structure analysis software employed in the step 2) is SACS.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120932.XA CN107725000B (en) | 2017-11-14 | 2017-11-14 | Offshore platform upper assembly with flare boom and towing fatigue damage calculation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120932.XA CN107725000B (en) | 2017-11-14 | 2017-11-14 | Offshore platform upper assembly with flare boom and towing fatigue damage calculation method thereof |
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| CN107725000B CN107725000B (en) | 2023-09-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3722551A1 (en) * | 2019-04-11 | 2020-10-14 | National Oilwell Varco Norway AS | Improvements relating to providing elongate structures, in particular flare or vent towers on vessels |
| CN115392026A (en) * | 2022-08-26 | 2022-11-25 | 哈尔滨工程大学 | Intelligent simulation system and modeling method for towing operation of jacket |
| US11966667B2 (en) | 2022-08-26 | 2024-04-23 | Harbin Engineering University | Intelligent simulation system for jacket towing and modeling method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3722551A1 (en) * | 2019-04-11 | 2020-10-14 | National Oilwell Varco Norway AS | Improvements relating to providing elongate structures, in particular flare or vent towers on vessels |
| CN115392026A (en) * | 2022-08-26 | 2022-11-25 | 哈尔滨工程大学 | Intelligent simulation system and modeling method for towing operation of jacket |
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| US11966667B2 (en) | 2022-08-26 | 2024-04-23 | Harbin Engineering University | Intelligent simulation system for jacket towing and modeling method thereof |
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| CN107725000B (en) | 2023-09-29 |
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