EP3137370B1 - Unité flottante pour opérations de forage - Google Patents

Unité flottante pour opérations de forage Download PDF

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Publication number
EP3137370B1
EP3137370B1 EP14739570.1A EP14739570A EP3137370B1 EP 3137370 B1 EP3137370 B1 EP 3137370B1 EP 14739570 A EP14739570 A EP 14739570A EP 3137370 B1 EP3137370 B1 EP 3137370B1
Authority
EP
European Patent Office
Prior art keywords
tower
support structure
floating
floating unit
unit according
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.)
Active
Application number
EP14739570.1A
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German (de)
English (en)
Other versions
EP3137370A1 (fr
Inventor
Gianni SCHERL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fincantieri Oil and Gas SpA
Original Assignee
Fincantieri Oil and Gas SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fincantieri Oil and Gas SpA filed Critical Fincantieri Oil and Gas SpA
Priority to PL14739570T priority Critical patent/PL3137370T3/pl
Publication of EP3137370A1 publication Critical patent/EP3137370A1/fr
Application granted granted Critical
Publication of EP3137370B1 publication Critical patent/EP3137370B1/fr
Priority to HRP20191602 priority patent/HRP20191602T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/48—Decks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/48—Decks
    • B63B3/52—Pillars; Deck girders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/70—Reinforcements for carrying localised loads, e.g. propulsion plant, guns
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B2003/147—Moon-pools, e.g. for offshore drilling vessels

Definitions

  • the present invention relates to a floating unit for drilling operations according to the preamble of claim 1.
  • a floating unit is disclosed by WO 2004/020275 .
  • the floating unit according to the invention may consist of a drillship intended, in particular, for operating in deep (over 450m) and ultra-deep (over 1,500m) waters, for localising, exploring and exploiting deposits of hydrocarbons or other energy and mineral resources.
  • the floating unit according to the invention may consist of a drilling platform, in particular of the semi-submersible type.
  • the drilling rigs comprise - at least one drilling tower (known in jargon as derrick) consisting of a structural trestle-work characterised by a structure of crossed rdos bolted to each other.
  • the trestle-work structure A rests on the so-called drill floor B.
  • the drill floor B is supported by a scaffolding C, known in the jargon as "substructure”, which in turn is placed on the main deck D of the ship.
  • the substructure C comprises four support columns C1 which support the drill floor B and are placed at the support points of the trestle-work structure on the drill floor and continue vertically to interlock deep down in the hull structure under the main deck. The vertical forces are discharged along the four corners of the base which rest on the drill deck.
  • This solution has been widely experimented in over twenty years of use on various offshore floating vessels.
  • the entire structure described above extends upwards of a central well E (in the jargon "moon pool") which extends from the main deck as far as the bottom and through which there is direct access to the water.
  • a box-type tower on a floating unit for drilling operations entails however the adoption of a series of structural modifications to the substructure of the tower above the main deck.
  • the drill floor needs to be adequately strengthened to enable it to withstand the weight of the box-like structure tower, taking into consideration the asymmetric distribution of the weights and strains generated by the fact that in a box-like structure tower, unlike a trestle-work derrick, the drilling devices are placed externally to said tower.
  • the purpose of the present invention is to eliminate the drawbacks of the prior art mentioned above, by making available a floating unit for drilling operations, and in particular a drill ship, which does not require a structurally oversized drill floor in terms of load capacity, despite being fitted with one or more drilling towers having a box-like structure with drilling devices external to said tower.
  • a further purpose of the present invention is to make available a floating unit for drilling operations, and in particular a drill ship, fitted with one or more drilling towers having a box-like structure, which permits adequate operativity of the drilling devices through the relative moon pools.
  • the floating unit according to the invention may consist of a drillship or alternatively of a drilling platform, in particular of the semi-submersible type.
  • reference numeral 1 globally denotes a floating unit for offshore drilling according to the invention consisting of a ship and with reference numeral 100 a floating unit for drilling operations according to the invention consisting of a platform.
  • the floating unit for offshore drilling operations 1, 100 comprises a floating structure 2 which defines a main deck 3, above which a drill floor 4 is positioned, and at least one drilling tower 5 which extends above the drill floor 4 next to at least one moon pool 6.
  • the floating structure 2 may define one or more secondary decks 7 positioned below the main deck 3.
  • the floating unit consists of a ship
  • the aforesaid floating structure is defined by the hull 2 of the ship 1, which extends along a longitudinal axis Z between a bow 21 and a stern 22.
  • the aforesaid floating structure comprises: at least one deck 101, which in conditions of use is above water; - a hull 102, which is positioned under the deck, and is fitted internally with first watertight compartments acting as ballast and in conditions of use is under water; and - a plurality of columns 103 which structurally connect the hull 102 to the deck 101.
  • the floating unit in particular if consisting of a ship 1, may be fitted with two or more drilling towers 5.
  • Such two or more towers may each operate on its own moon pool, independently of the others, or alternatively may operate on a single communal moon pool.
  • each of the aforesaid one or more drilling towers 5 serves a single drill line.
  • two or more towers operate independently of each other.
  • such tower may be structured to serve a single drill line.
  • the single moon pool or independent moon pools where provided for are made on the longitudinal centreline axis Z of the ship.
  • the aforesaid at least one drilling tower 5 has a box-like structure, of a column shape with a base of any shape (generally circular) and is fitted with a hoisting hook 50 of the drill strings placed outside the tower and projecting in relation to the vertical extension axis Y of said tower.
  • This type of tower supports a compression load only, both the external, overhanging load suspended from the hoisting hook 50 and the pull coming from the hoisting winch cables 51 on the opposite side to the tower being perfectly aligned, vertical and symmetrical.
  • the hoisting cables of the hook go to a pair of pulleys 52 and 53, positioned on the top 5' of the tower 5 and directly running to the winch 51 symmetrically to the hoisting hook 50.
  • Such geometry guarantees a perfect vertical and symmetrical alignment of the hoisting cables and thus a static load on the tower solely of compression.
  • the aforesaid at least one drilling tower 5 is directly supported by a support structure 10 structurally integrated with the floating structure 2 of the floating unit.
  • the support structure 10 and/or the tower 5 crosses the drill floor 4.
  • the drill floor 4 is structurally supported by the support structure 10 of the tower 5, by the tower itself or by both the support structure and the tower.
  • the drill floor (or drill deck) instead which is supported by the drilling tower or support structure which the tower rests directly on.
  • the drilling tower does not rest on the drill deck, but crosses it and engages directly in the floating structure 2 by means of the aforesaid support structure 10.
  • the drilling tower is thus made entirely independent of the drill deck. Considering that the drill deck is essential for operating purposes and must be positioned higher than the main deck, it proves advantageous to make use of the presence of the tower and relative support structure to rest thereon the drill deck also.
  • the drill deck does not in fact have to be sized to support the weight of the tower.
  • the drill floor 4 (or drill deck) - as well as the tower 5 and/or support structure 10 of the tower - may also be conveniently supported by dedicated pillars or other vertical structures present in the perimeter of its extension.
  • the support structure 10 of the tower 5 extends vertically inside the floating structure 2.
  • the support structure 10 may extend inside the floating structure 2 to a depth varying case by case and depending on the different opportunities and requirements to be considered separately for each project.
  • the support structure 10 of the tower extends vertically inside the floating structure 2 as far as the main deck 3 and is structurally integrated with the main deck 3 resting thereon.
  • the support structure 10 of the tower extends vertically inside the floating structure 2 as far as the bottom 8 thereof and is structurally integrated with the bottom 8 resting thereon.
  • the support structure 10 of the tower may extend vertically inside the floating structure 2 as far as one of said secondary decks 7 and is structurally integrated with one of said secondary decks resting thereon.
  • the support structure 10 of the tower 5 is a column structure.
  • the support structure 10 of the tower is a tubular or box-like structure.
  • the support structure 10 comprises a main portion 11 which extends along a main vertical extension axis X, laterally to the aforesaid at least one moon pool 6 which the drilling tower 5 operates on supported by the support structure 10.
  • the support structure 10 of the tower 5 comprises a portion 12 of interface and connection with the base 5' of the tower 5.
  • the particular geometry of the box-like tower with hoisting hook positioned externally to the tower does not permit the tower to be positioned in line with the moon pool 6, but requires an installation lateral to said moon pool.
  • the aforesaid interface and connection portion 12 is offset in relation to the main vertical extension axis X of the support structure 10 and at least partially overlaps the moonpool 6. This way, the support structure 10 can support the box-like drilling tower 5 at least partially to overhang above the moonpool 6, so as to position the hoisting hook 50 above the moonpool 6.
  • the interface portion 12 extends in the moonpool so that the hoisting hook 50 is aligned with the main vertical extension axis Y of said moon pool.
  • the drilling tower may be placed fully in line with the vertical extension axis of the support structure, avoiding the construction of cantilever structures.
  • the pulleys 51, 52 positioned on the top of the towers must be adequately enlarged to ensure a sufficient distance between the movement axis of the strings and the edges of the moon pool.
  • the increase in dimensions of the pulleys increases the distance between the movement axis of the strings and the vertical extension axis of the tower. This determines an increase in the already large dynamic loads weighing on the tower which must therefore be adjusted from a structural point of view.
  • the partial cantilever arrangement of the tower over the moonpool makes it possible to position the hoisting hook perfectly in line with the vertical extension axis of the moon pool using pulleys of smaller dimensions, thereby avoiding the need for oversizing of the tower. This translates into the possibility of installing a tower, which is lighter and occupies less space.
  • the drilling tower 5 is aligned perpendicular to the interface portion 12 of the support structure 10.
  • the support structure 10 of the tower 5 comprises a fitting portion 13 between the main portion 11 and the interface portion 12.
  • Such fitting portion 13 extends from the main portion 11 towards the moonpool 6 deviating from the main vertical extension axis X of the support structure 10 of the tower 5.
  • the base 5' of the tower 5 and the interface portion 12 of the support structure 10 penetrate each other.
  • the base 5' of the tower 5 engages inside a seat 14 made in the interface portion 12.
  • the base 5' of the tower 5 is attached to the interface portion 12 by means of a flanged coupling.
  • a flanged coupling may be provided for different types of coupling to a flanged coupling.
  • the floating unit consists of a ship.
  • the floating structure is defined by the hull 2 of the ship 1, which extends along a longitudinal axis Z between a bow 21 and a stern 22.
  • the aforesaid at least one drilling tower 5 is positioned asymmetrically in relation to the longitudinal centreline axis Z of the ship, the tower 5 being shifted towards a first side 23 of the ship.
  • the aforesaid at least one drilling tower 5 may be positioned symmetrically in relation to the longitudinal centreline axis Z of the ship, i.e. the drilling tower 5 is positioned on the longitudinal centreline axis Z of the ship,
  • the drill floor 4 (or drill deck) - as well as by the tower 5 and/or by the support structure 10 of the tower - may be supported by at least one structural support element 30 which extends vertically from the main deck 3 next to the second side 24 of the ship, opposite the drilling tower 5 in relation to the longitudinal centreline extension axis Z of the ship.
  • the aforesaid structural support element 30 is composed of a wall which delimits the storage and assembly area of the drill strings next to the drilling tower 5.
  • such wall 30 extends vertically beyond the drill floor 4 (or drill deck).
  • the storage and assembly area of the drill strings is called the "setback" in the jargon.
  • This area integrated or in any case next to the drill floor is used to store the drill strings previously prepared in groups of three strings screwed one to the other to form a single string of approx. 41 m. This makes it possible to reduce the times for lowering and raising the total string, often several kilometres long and to have the right diameter and type of string for the specific drilling operation planned.
  • the drill strings thus preassembled using the main lift hooks are vertically stored between one drilling campaign and another in the setback in special racks called fingerboards which block the strings vertically in two points , one at the bottom and one at the top.
  • fingerboards may be made in the aforesaid wall 30, used as a vertical support element of the drill floor.
  • the strings are unscrewed from each other by the roughneck and singly replaced in the storage stacks using a special dedicated horizontal chute called catwalk.
  • the drill strings 54 may be stored on one side of the floating unit, in order to be inclined towards midship, one by one, until the upper end is at the centre of the moonpool vertically beneath the hoisting hook; the string is then raised and inserted in the central hole on the drill deck and lowered into the hole of the oil well below on the sea bed.
  • a floating unit for drilling operations according to the invention in particular a drill ship, may be fitted with one or more drilling towers of the box-like type with drilling devices outside the tower without necessarily having a structurally oversized drill floor or drill deck in terms of load capacity.
  • a floating unit for drilling operations made according to the invention may be fitted with one or more drilling towers of the box-like type with drilling devices outside the tower positioned so as to respect both the operating functions and the distribution of the loads coming from the static weights and from the dynamic accelerations of the tower.

Claims (15)

  1. Unité flottante pour des opérations de forage en mer comprenant au moins une structure flottante (2) qui définit un pont principal (3), au-dessus duquel un plancher de forage (4) est placé, et au moins une tour de forage (5) ayant une structure de type boîte qui s'étend au-dessus du plancher de forage (4) à côté d'au moins un puits central (6) qui croise verticalement la structure flottante au niveau du plancher de forage (4) jusqu'à la partie inférieure (8) de ladite structure flottante, dans laquelle la tour de forage (5) est directement supportée par une structure de support (10) intégrée structurellement à la structure flottante (2) et dans laquelle la structure de support (10) de la tour (5) et/ou la tour (5) croise le plancher de forage (4), le plancher de forage étant structurellement supporté par la structure de support (10) de la tour et/ou par la tour de forage elle-même, la structure de support (10) de la tour s'étendant verticalement à l'intérieur de la structure flottante (2), dans laquelle :
    - la structure de support (10) est intégrée structurellement au pont principal (3) reposant dessus ; ou
    - la structure flottante (2) définit un ou plusieurs ponts secondaires (7) positionnés en dessous du pont principal (3), la structure de support (10) de la tour étant intégrée structurellement à l'un desdits ponts secondaires (7) reposant dessus ; ou
    - la structure flottante (2) est pourvue d'une partie inférieure (8) la structure de support (10) de la tour étant intégrée structurellement à la partie inférieure (8) de la structure flottante (2) reposant dessus,
    dans laquelle la structure de support (10) de la tour (5) comprend une partie principale (11) qui s'étend le long d'un axe d'extension vertical principal (X), latéralement par rapport audit puits central (6),
    caractérisée en ce que la structure de support (10) de la tour (5) comprend une partie (12) d'interface et de connexion avec une base (5') de la tour (5), ladite partie d'interface (12) étant décalée par rapport à l'axe d'extension vertical principal (X) de la structure de support (10) et étant au moins partiellement chevauchée par le puits central (6), de sorte qu'au moyen de la partie d'interface (12) la structure de support (10) supporte la tour (5) au moins partiellement pour surplomber le puits central (6).
  2. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la structure de support (10) de la tour est une structure de colonne.
  3. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la structure de support (10) de la tour est une structure tubulaire ou de type boîte.
  4. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la tour de forage (5) est équipée avec au moins un crochet de levage (50) des trains de tiges de forage, associé à la partie supérieure de la tour (5) et positionné à l'extérieur de celle-ci et dans laquelle ladite partie d'interface (12) s'étend dans le puits central de sorte que le crochet de levage (50) est positionné au-dessus du puits central (6), et est de préférence aligné avec l'axe d'extension vertical principal (Y) dudit puits.
  5. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la tour (5) est alignée perpendiculairement à la partie d'interface (12) de la structure de support (10).
  6. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la structure de support (10) de la tour (5) comprend une partie de raccord (13) entre la partie principale (11) et la partie d'interface (12), ladite partie de raccord (13) s'étendant à partir de la partie principale (11) vers le puits central (6) en déviant par rapport à l'axe d'extension vertical principal (X) de la structure de support (10) de la tour (5).
  7. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la base (5') de la tour (5) et la partie d'interface (12) de la structure de support (10) pénètrent l'une dans l'autre.
  8. Unité flottante selon une ou plusieurs des revendications précédentes, dans laquelle la base (5') de la tour (5) est attachée à la partie d'interface (12) au moyen d'un accouplement à bride.
  9. Unité flottante selon une ou plusieurs des revendications précédentes, caractérisée en ce que c'est un navire (1), comprenant une coque qui s'étend le long d'un axe longitudinal (Z) entre une proue (21) et une poupe (22), ladite structure flottante étant la coque (2) du navire (1).
  10. Unité flottante selon la revendication 9, dans laquelle ladite au moins une tour de forage (5) est positionnée de manière asymétrique par rapport à l'axe central longitudinal (Z) du navire (1), la tour (5) étant décalée vers un premier côté (23) du navire.
  11. Unité flottante selon la revendication 10, dans laquelle le plancher de forage (4) est supporté par au moins un élément structurel de support (30) qui s'étend verticalement à partir du pont principal (3) à côté du second côté (24) du navire, opposé à la tour de forage (5) par rapport à l'axe d'extension central longitudinal (Z) du navire (1).
  12. Unité flottante selon la revendication 11, dans laquelle ledit élément structurel de support (30) est composé d'une paroi, qui délimite la zone de stockage et d'assemblage des trains de tiges de forage à côté de la tour (5).
  13. Unité flottante selon la revendication 12, dans laquelle ladite paroi s'étend verticalement au-delà du plancher de forage (4).
  14. Unité flottante selon la revendication 13, dans laquelle ladite au moins une tour de forage (5) est positionnée sur l'axe central longitudinal (Z) du navire.
  15. Unité flottante selon une ou plusieurs des revendications 1 à 8 caractérisée en ce qu'il s'agit d'une plate-forme semi-submersible (100).
EP14739570.1A 2014-04-29 2014-04-29 Unité flottante pour opérations de forage Active EP3137370B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL14739570T PL3137370T3 (pl) 2014-04-29 2014-04-29 Jednostka pływająca do operacji wiertniczych
HRP20191602 HRP20191602T1 (hr) 2014-04-29 2019-09-05 Plutajuća jedinica za operacije bušenja

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2014/000117 WO2015166514A1 (fr) 2014-04-29 2014-04-29 Unité flottante pour opérations de forage

Publications (2)

Publication Number Publication Date
EP3137370A1 EP3137370A1 (fr) 2017-03-08
EP3137370B1 true EP3137370B1 (fr) 2019-06-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14739570.1A Active EP3137370B1 (fr) 2014-04-29 2014-04-29 Unité flottante pour opérations de forage

Country Status (7)

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EP (1) EP3137370B1 (fr)
KR (1) KR102161240B1 (fr)
ES (1) ES2745750T3 (fr)
HR (1) HRP20191602T1 (fr)
PL (1) PL3137370T3 (fr)
SG (1) SG11201609009UA (fr)
WO (1) WO2015166514A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2019225B1 (en) * 2017-07-11 2019-01-25 Itrec Bv Vessel and method to perform subsea wellbore related operations
CN115743427A (zh) * 2022-11-02 2023-03-07 中国船舶集团有限公司第七〇八研究所 一种多功能大洋钻探船船型

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1009043C2 (nl) * 1998-04-29 1999-11-01 Huisman Spec Lifting Equip Bv Gedeeltelijk afzinkbaar vaartuig.
US6871609B2 (en) 2002-08-30 2005-03-29 Itrec B.V. Multipurpose tower for monohull
US8590474B2 (en) * 2008-02-15 2013-11-26 Itrec B.V. Offshore drilling vessel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
KR102161240B1 (ko) 2020-10-05
SG11201609009UA (en) 2016-11-29
WO2015166514A1 (fr) 2015-11-05
HRP20191602T1 (hr) 2019-12-13
KR20170021771A (ko) 2017-02-28
EP3137370A1 (fr) 2017-03-08
PL3137370T3 (pl) 2020-01-31
ES2745750T3 (es) 2020-03-03

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