EP1260670A1 - Méthode de dimensionnement d'un riser de forage - Google Patents
Méthode de dimensionnement d'un riser de forage Download PDFInfo
- Publication number
- EP1260670A1 EP1260670A1 EP02291245A EP02291245A EP1260670A1 EP 1260670 A1 EP1260670 A1 EP 1260670A1 EP 02291245 A EP02291245 A EP 02291245A EP 02291245 A EP02291245 A EP 02291245A EP 1260670 A1 EP1260670 A1 EP 1260670A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- riser
- tension
- assembly
- margin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000013459 approach Methods 0.000 claims abstract description 3
- 238000005188 flotation Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 5
- 238000004513 sizing Methods 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 239000004459 forage Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000013535 sea water Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 241000195940 Bryophyta Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000011929 mousse Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Images
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
Definitions
- the present invention relates to the field of offshore drilling, especially using floating support, such as a boat or a semi-submersible platform with dynamic positioning.
- floating support such as a boat or a semi-submersible platform with dynamic positioning.
- the head of the well is at the bottom of the sea ("mud-line"), which requires an extension column through the slice of water, a column called “Riser” in the profession.
- This column which is made up of elements of length between approximately 15 and 30 m, must comply with a specification rigorous loads taking into account the maritime and safety conditions of drilling.
- the riser is the key element of drilling in great depths of water and must be studied with the greatest care.
- the architecture of such a riser depends a number of parameters related to operational conditions and environment, such as water depth, maximum density of the drilling mud, the diameter of the peripheral lines (kill-line, choke-line) and their working pressure, sea conditions and current profiles, the offset of the floating support (with dynamic positioning or not).
- the conditions are different in drilling mode (riser connected to the wellhead and attached to the tensioning means) and in disconnected mode (riser suspended under the floating support, suspended from the drilling table without the intermediary of means tensioning).
- the means of flotation taken can be modified account in step a) when the voltage margin in disconnected mode is far from said determined value, so as to approach the value of said margin.
- the thickness of the main tube can be varied when the constraints of Von-Mises calculated in step c) do not respect said determined criterion. We can thus optimize the architecture of the entire riser or riser.
- the criterion may consist in imposing that the constraints of Von-Mises are less than 2/3 of the elastic limit of the steel of the main tube.
- the thickness of the tube can be increased when said constraints are greater than about 2/3 of the elastic limit, and we can decrease the thickness of the tube when said stresses are less than about 2/3 of the elastic limit.
- a loss thickness of the main tube and a loss of buoyancy of the means of waterline may correspond to the manufacturing tolerance and / or corrosion. Loss of buoyancy may be due to absorption of water over time.
- the tensioning margin in disconnected mode can be at least equal to 20 t.
- reference 1 designates the entire riser or "riser” drilling.
- the schematic subsea wellhead is referenced 2.
- the riser is linked to the well head 2 by a flexible joint 3 fixed above the upper control unit 4 comprising, inter alia, a connector which allows the disconnection of the riser from the shutter block.
- the part lower 5 of the riser is devoid of buoyancy elements unlike the upper part 6.
- the top of the riser is connected to the floating support 7 by via tensioning winches (not shown).
- Figure 2 shows a cross section of a riser element mainly consisting of a main and central tube 8, of tubular lines auxiliaries (kill-line, choke-line, boosting line) 9, buoyancy elements 10, usually in the form of two syntactic foam half shells or equivalent material.
- Figure 3 illustrates a riser element comprising a pair of upper 11 and lower 12 connectors whose functions are to connect the main tubes together, but also to connect the auxiliary lines.
- Reference 13 designates a half buoyancy element shell.
- T true T effective + P i S i - P e S e where P i , P e respectively internal and external pressure of the tube S i , S e respectively internal and external section
- T riser effective ( z ) T top - ⁇ top z ( W riser + W mud )
- T riser effective T MP effective + ⁇ T AL effective
- T connector true T MP effective + ( P i - P e ) * S seal where S seal is the connector sealing section.
- T MP / effective is normally maximum at the top of the riser. ( P i - P e ) * S seal is maximum at the foot of riser. Thus, there is a depth for which the T connector / true tension in the connectors is maximum (around 1500 - 2000m), depending on the mud density considered.
- the tension at the head of the riser must always remain positive when the drill stand is subject to heaving.
- the head tension is the difference between the weight apparent riser and the tension amplified by the pounding of the support floating. This criterion therefore requires that the weight of the suspended riser is greater at the maximum amplitude of the voltage variation at any point of the riser. We can take, for example 20 t of safety margin.
- the amplified voltage of the riser according to the heaving results from a conventional dynamic calculation.
- each section of the riser is optimized to meet the criteria of the mode drilling (connected) while the compensation (see formula below) is adjusted to avoid any "stress relieving" (negative head tension or less than a safety margin) in disconnected mode.
- Compensation is an important ratio which makes it possible to fix the diameter floats.
- the compensation In a first design phase, the compensation must be the as high as possible so that the head tension is minimal. However, the compensation must be adjusted to meet the criteria for disconnected mode. A compromise must be found to meet the criteria.
- 100% compensation means that the apparent weight of the riser sucks.
- a dimensioning preliminary thickness and diameter of floats
- iterations on the global compensation and the thickness of the main tube of each section can be conducted from the way below.
- the criterion in disconnected mode must be checked (see above dimensioning principles). Security in the face of “stress relieving” must be determined by considering decennial sea conditions or centennial. If the safety margin is negative (i.e. the riser is subject to a risk of dynamic buckling), the compensation must be decreased. If the safety margin is too large, compensation may be increased.
- the compensation has been adjusted in disconnected mode, you must check the criteria of the connected mode (see above the principles of sizing).
- the Von-Mises criteria must be checked for each riser section. If these constraints exceed 2/3 of the elastic limit, the thickness of the main tube should be increased by 1/16 of an inch. Conversely, if these constraints are lower than the elastic limit, the thickness of the main tube can be reduced by 1/16 ". After each modification of the thickness of a section, the safety margin facing the "Stress relieving" should be checked in order to re-adjust the compensation.
- the last step of the design goes through a dynamic calculation. These calculations must take into account the movements of the drilling rig (heaving, offset), current profile, sea conditions to assess the axial and bending stresses at any point of the riser, as well as the angle in foot.
- This last step can be carried out using element software such as Deeplines TM (IFP) (Fully coupled dynamic analysis of rigid lines-J.M. Heurtier, F. Biolley (IFP); C. Berhault (Principia) -p 246-252, proceedings of ISOPE 98 - Canada-Montreal).
- IFP Deeplines TM
- This first architecture makes it possible to calculate in disconnected mode DM the safety margin M representing the margin of voltage between the amplified voltage Ta of the riser taking into account the heaving of the support and the apparent weight of the riser W. If this margin is negative, or judged insufficient, we loop through line 21 by decreasing the value of the compensation C. If the margin is considered too large, we loop through the line 22 by increasing the compensation C. We can take, for example, a margin of about 20 tonnes.
- Block 27 shows schematically the obtaining of the final architecture, responding to the specifications and standards in force.
- All of the steps 28 can be compared to verifications in calculating the tension at the head of the TT riser taking into account the thickness nominal EN of the tube, without corrosion and considering a loss of buoyancy 3%. From TT, we check (block 29) if the connectors are compatible with this tension, and if the tensioning means of the floating support are enough.
- the architecture of the riser obtained is dynamically verified using DeepLines TM software (IFP), or equivalent.
- IFP DeepLines TM software
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Description
- on choisit une architecture complète de l'ensemble prolongateur à partir d'un cahier des charges, notamment en se fixant l'épaisseur du tube principal et des moyens de flottaison, et on calcule le poids apparent de cet ensemble,
- on détermine la marge de tension en tête dudit ensemble, en mode déconnecté de la tête du puits, compte tenu du poids apparent et de la tension amplifiée en tête par les mouvements du support flottant auquel est suspendu ledit ensemble,
- dans le cas où la marge de tension correspond à une valeur proche d'une valeur déterminée, on calcule les contraintes de Von-Mises dans toutes les sections du tube, en mode connecté à la tête du puits,
- dans le cas où lesdites contraintes sont proche d'un critère déterminé en relation avec la limite élastique du matériau du tube: on vérifie par calcul la charge sur chaque composant de l'ensemble prolongateur, ainsi que sa fatigue en dynamique.
- la figure 1 décrit une installation de forage offshore,
- la figure 2 montre une coupe transversale d'un riser,
- la figure 3 montre une élément de riser équipé de moyens de flottaison,
- la figure 4 illustre le principe de la méthodologie selon l'invention.
Wmud : poids apparent de la boue
Tbottom : tension résiduelle en pied de riser
WAL : poids apparent des lignes périphériques ;
Wmisc : poids apparent des autres composants (joint télescopique, joint flexible, joint de terminaison, etc)
ΔBM : poids apparent des flotteurs (de signe négatif)
ID 2 AP : diamètre intérieur des lignes périphériques ;
ρ sw : densité de l'eau de mer ;
Lriser : longueur totale du riser.
- La tension résiduelle en pied de riser Tbottom doit être maintenue positive pour respecter un angle en pied dans les limites fixées par la norme API 16Q (angle moyen de 2° en statique). Pour la plupart des cas, cette tension est de l'ordre de 100 t.
Si , Se respectivement section interne et externe
I : moment d'inertie du riser
q(z): chargement latéral dû au courant
- les contraintes de Von-Mises sont inférieures à 2/3 de la limite élastique,
- l'angle moyen en pied de riser inférieur à 2° en statique.
- Le riser est connecté à l'appareil de forage par un joint télescopique et un système de tensionnement.
- Le riser est rempli par la boue de densité maximale.
- Les lignes périphériques sont sous pression.
- L'épaisseur du tube principal est diminuée de 5%, sur toute sa longueur, pour prendre en compte les tolérances des tubes.
- L'épaisseur du tube principal est diminuée de 2 mm pour prendre en compte la corrosion.
- Les flotteurs ont une perte de flottabilité de 3% due à la pénétration d'eau de mer.
- Le riser est déconnecté de la tête de puits.
- Le tube principal et les lignes périphériques sont remplis d'eau.
- Les lignes périphériques sont à la pression hydrostatique.
- L'épaisseur du tube principal est diminuée de 5%, sur toute sa longueur, pour prendre en compte les tolérances des tubes.
- L'épaisseur du tube principal est diminuée de 2 mm pour prendre en compte la corrosion.
- Les flotteurs ont une perte de flottabilité de 3% due à la présence d'eau de mer.
- Les conditions de l'environnement, ainsi que la profondeur d'eau, sont fixées par la localisation du forage.
- La densité maximale de la boue est imposée par les prévisions des pressions attendues, notamment du réservoir.
- Les caractéristiques des lignes périphériques (diamètre, pression de service) sont déterminées à partir de la pression de service des obturateurs de sécurité (BOP) (10,000 psi ou 15,000 psi).
- Le diamètre du tube principal du riser (souvent 21") est dicté par le programme de forage.
- Les caractéristiques du matériau des flotteurs définissent les différentes sections du riser: une section pour une densité de mousse (souvent tous les 500 à 600 m).
- caractéristiques du tube principal, des connecteurs, des éléments auxiliaires (joint télescopique, joint flexible, embase de commande,... ;
- caractéristiques des lignes auxiliaires périphériques ;
- caractéristiques des flotteurs ;
- conditions maritimes, courants, profondeur, vents, houle,... ;
- données liées au programme du forage : densité du fluide de forage, diamètre du tube interne.
- grades d'acier des tubes ;
- tension en pied de riser (par exemple 100 t) ;
- tolérance d'épaisseur du tube principal ;
- prise en compte d'une diminution d'épaisseur (environ 1/16 de pouce (1 pouce=25,4 mm)) à cause de la corrosion ;
- densité maximale de la boue ;
- perte de flottabilité d'environ 3% ;
- pressurisation des lignes auxiliaires.
Claims (8)
- Méthode pour dimensionner un ensemble prolongateur (1) pour le forage en mer reliant une tête de puits sous-marine (2) à un support flottant (7) comprenant un tube principal (8), dans laquelle on effectue les étapes suivantes:a) on choisit une architecture complète de l'ensemble prolongateur à partir d'un cahier des charges, notamment en se fixant l'épaisseur du tube principal et des moyens de flottaison, et on calcule le poids apparent de cet ensemble,b) on détermine une marge de sécurité sur la tension en tête dudit ensemble, en mode déconnecté de la tête du puits, compte tenu du poids apparent et de la tension amplifiée en tête par les mouvements du support flottant auquel est suspendu ledit ensemble,c) dans le cas où ladite marge correspond à une valeur proche d'une valeur déterminée, on calcule les contraintes de Von-Mises dans toutes les sections du tube, en mode connecté à la tête du puits,d) dans le cas où lesdites contraintes sont proche d'un critère déterminé en relation avec la limite élastique du matériau du tube : on obtient l'architecture de l'ensemble prolongateur et on vérifie la compatibilité de chaque composant de l'ensemble prolongateur à la tension maximale, ainsi que la fatigue en dynamique dudit ensemble.
- Méthode selon la revendication 1, dans laquelle on modifie les moyens de flottaison pris en compte dans l'étape a) lorsque ladite marge de tension en mode déconnecté est éloignée de ladite valeur déterminée, de façon à approcher la valeur de ladite marge.
- Méthode selon la revendication 2, dans laquelle on modifie les moyens de flottaison en faisant varier au moins l'un des paramètres suivants : le nombre de flotteurs, la répartition des flotteurs, le diamètre des flotteurs, la masse volumique du matériau des flotteurs.
- Méthode selon l'une des revendications précédentes, dans laquelle on fait varier l'épaisseur du tube principal lorsque les contraintes de Von-Mises calculées à l'étape c) ne respectent pas ledit critère déterminé.
- Méthode selon la revendication 4, dans laquelle ledit critère impose que les contraintes de Von-Mises soient inférieures à 2/3 de la limite élastique de l'acier du tube principal.
- Méthode selon la revendication 5, dans laquelle on augmente l'épaisseur du tube lorsque lesdites contraintes sont supérieures à environ 2/3 de la limite élastique, et en ce que l'on diminue l'épaisseur du tube lorsque lesdites contraintes sont inférieures à environ 2/3 de la limite élastique.
- Méthode selon l'une des revendications précédentes, dans laquelle on effectue les étapes a) et b) en prenant en compte une perte d'épaisseur du tube principal et une perte de flottabilité des moyens de flottaison.
- Méthode selon l'une des revendications précédentes, dans laquelle ladite marge est au moins égale à 20 t.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107007 | 2001-05-25 | ||
FR0107007A FR2825116B1 (fr) | 2001-05-25 | 2001-05-25 | Methode de dimensionnement d'un riser de forage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1260670A1 true EP1260670A1 (fr) | 2002-11-27 |
EP1260670B1 EP1260670B1 (fr) | 2008-01-02 |
Family
ID=8863734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02291245A Expired - Lifetime EP1260670B1 (fr) | 2001-05-25 | 2002-05-21 | Méthode de dimensionnement d'un riser de forage |
Country Status (6)
Country | Link |
---|---|
US (1) | US7630866B2 (fr) |
EP (1) | EP1260670B1 (fr) |
AT (1) | ATE382771T1 (fr) |
DE (1) | DE60224323D1 (fr) |
DK (1) | DK1260670T3 (fr) |
FR (1) | FR2825116B1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2474468A1 (fr) * | 2006-11-08 | 2012-07-11 | Acergy France SA | Colonne montante hybride |
CN103958818A (zh) * | 2011-11-29 | 2014-07-30 | 韦尔斯特里姆国际有限公司 | 浮力补偿元件和方法 |
CN108961430A (zh) * | 2018-06-27 | 2018-12-07 | 山东大学 | 一种任意形状物体的漂浮支撑组件的获取方法及系统 |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2839339B1 (fr) * | 2002-05-03 | 2004-06-04 | Inst Francais Du Petrole | Methode de dimensionnement d'un element de colonne montante avec conduites auxiliaires integrees |
GB0227851D0 (en) * | 2002-11-29 | 2003-01-08 | Stolt Offshore Sa | Subsea structure and methods of construction and installation thereof |
US7383885B2 (en) * | 2004-09-22 | 2008-06-10 | William von Eberstein | Floatation module and method |
US20080302535A1 (en) * | 2007-06-08 | 2008-12-11 | David Barnes | Subsea Intervention Riser System |
US7766580B2 (en) * | 2008-02-14 | 2010-08-03 | National Oilwell Varco, L.P. | Energy managing keel joint |
FR2937676B1 (fr) | 2008-10-29 | 2010-11-19 | Inst Francais Du Petrole | Methode pour alleger une colonne montante avec piece d'usure optimisee |
US8322438B2 (en) * | 2009-04-28 | 2012-12-04 | Vetco Gray Inc. | Riser buoyancy adjustable thrust column |
US8443896B2 (en) | 2009-06-04 | 2013-05-21 | Diamond Offshore Drilling, Inc. | Riser floatation with anti-vibration strakes |
CA2977364C (fr) * | 2015-02-26 | 2019-02-26 | Exxonmobil Upstream Research Company | Colonne montante de forage a flottabilite repartie |
US9908594B2 (en) | 2016-04-29 | 2018-03-06 | Expert E&P Consultants, L.L.C. | Flotation system and method |
US10167677B2 (en) | 2016-04-29 | 2019-01-01 | William von Eberstein | Flotation system and method |
GB2551816B (en) * | 2016-06-30 | 2019-04-03 | Trelleborg Offshore Uk Ltd | Stacked buoyancy module for a subsea member |
CN107167390B (zh) * | 2017-05-22 | 2024-02-20 | 中国海洋石油集团有限公司 | 一种深水水下井口疲劳试验装置 |
CN108595767B (zh) * | 2018-03-27 | 2022-04-05 | 浙江工业大学 | 一种基于可靠性的海洋立管viv疲劳安全系数的确定方法 |
BR102018014298B1 (pt) * | 2018-07-13 | 2021-12-14 | Petróleo Brasileiro S.A. - Petrobras | Sistema e método de suporte a operação de instalações submarinas para reconstrução 3d de linhas flexíveis durante uma operação de conexão vertical direta |
CN110069847B (zh) * | 2019-04-18 | 2023-10-13 | 中国石油大学(华东) | 一种深水钻井隔水管辅助管线试压优化决策方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2342938A (en) * | 1998-10-13 | 2000-04-26 | Inst Francais Du Petrole | Offshore drill pipe riser with adjustable buoyancy |
WO2000058598A1 (fr) * | 1999-03-25 | 2000-10-05 | Pgs Offshore Technology As | Systeme avec chassis de guidage pour colonnes montantes de production de petrole, chassis de guidage pour colonnes montantes, elements flotteurs pour colonnes montantes et plate-forme de production semi-submersible |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2653162B1 (fr) * | 1989-10-17 | 1995-11-17 | Inst Francais Du Petrole | Colonne montante pour grande profondeur d'eau. |
-
2001
- 2001-05-25 FR FR0107007A patent/FR2825116B1/fr not_active Expired - Fee Related
-
2002
- 2002-05-21 DK DK02291245T patent/DK1260670T3/da active
- 2002-05-21 AT AT02291245T patent/ATE382771T1/de not_active IP Right Cessation
- 2002-05-21 EP EP02291245A patent/EP1260670B1/fr not_active Expired - Lifetime
- 2002-05-21 DE DE60224323T patent/DE60224323D1/de not_active Expired - Lifetime
- 2002-05-24 US US10/153,768 patent/US7630866B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2342938A (en) * | 1998-10-13 | 2000-04-26 | Inst Francais Du Petrole | Offshore drill pipe riser with adjustable buoyancy |
WO2000058598A1 (fr) * | 1999-03-25 | 2000-10-05 | Pgs Offshore Technology As | Systeme avec chassis de guidage pour colonnes montantes de production de petrole, chassis de guidage pour colonnes montantes, elements flotteurs pour colonnes montantes et plate-forme de production semi-submersible |
Non-Patent Citations (3)
Title |
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FERNANDES: "UP-TO-DATE SPREADSHEET PROGRAM FOR PRELIMINARY ANALYSIS OF FLEXIBLE AND STEEL CATENARY RISERS USING CATENARY CONCEPTS", September 1997, COMPUTATIONAL MECHANICS PUBLICATION, SOUTHAMPTON BOSTON, XP001059619 * |
GARDNER, T., KOTCH, M.: "Dynamic Analysis of Risers by the Element Method", SPE 6310, 3 May 1976 (1976-05-03), XP002188782 * |
WYBRO, P., DAVIES, K.: "The Dorado Field Production Risers", SPE 11549, December 1982 (1982-12-01), XP002188781 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2474468A1 (fr) * | 2006-11-08 | 2012-07-11 | Acergy France SA | Colonne montante hybride |
CN103958818A (zh) * | 2011-11-29 | 2014-07-30 | 韦尔斯特里姆国际有限公司 | 浮力补偿元件和方法 |
US9151121B2 (en) | 2011-11-29 | 2015-10-06 | Ge Oil & Gas Uk Limited | Buoyancy compensating element and method |
CN103958818B (zh) * | 2011-11-29 | 2017-05-10 | 通用电气石油和天然气英国有限公司 | 浮力补偿组件和方法 |
CN108961430A (zh) * | 2018-06-27 | 2018-12-07 | 山东大学 | 一种任意形状物体的漂浮支撑组件的获取方法及系统 |
CN108961430B (zh) * | 2018-06-27 | 2020-03-27 | 山东大学 | 一种任意形状物体的漂浮支撑组件的获取方法及系统 |
Also Published As
Publication number | Publication date |
---|---|
DE60224323D1 (de) | 2008-02-14 |
FR2825116B1 (fr) | 2003-12-05 |
US7630866B2 (en) | 2009-12-08 |
FR2825116A1 (fr) | 2002-11-29 |
US20030026663A1 (en) | 2003-02-06 |
ATE382771T1 (de) | 2008-01-15 |
DK1260670T3 (da) | 2008-05-13 |
EP1260670B1 (fr) | 2008-01-02 |
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