EP1576254A1 - An assembly for protecting a flexible tube against wear by friction - Google Patents

An assembly for protecting a flexible tube against wear by friction

Info

Publication number
EP1576254A1
EP1576254A1 EP03779586A EP03779586A EP1576254A1 EP 1576254 A1 EP1576254 A1 EP 1576254A1 EP 03779586 A EP03779586 A EP 03779586A EP 03779586 A EP03779586 A EP 03779586A EP 1576254 A1 EP1576254 A1 EP 1576254A1
Authority
EP
European Patent Office
Prior art keywords
stiffener
tube
flexible tube
trumpet
internal wall
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
Application number
EP03779586A
Other languages
German (de)
French (fr)
Other versions
EP1576254B1 (en
Inventor
Roberto Jourdan De Aquino
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.)
Technip Energies France SAS
Original Assignee
Technip France SAS
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 Technip France SAS filed Critical Technip France SAS
Publication of EP1576254A1 publication Critical patent/EP1576254A1/en
Application granted granted Critical
Publication of EP1576254B1 publication Critical patent/EP1576254B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1085—Wear protectors; Blast joints; Hard facing
    • 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
    • E21B17/017—Bend restrictors for limiting stress on risers
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform

Definitions

  • the present invention relates to an assembly for protecting a flexible tube against wear by friction, particularly for protecting risers, jumpers or umbilicals in contact with stiffeners arranged in l-tubes.
  • flexible tubes are connected to platforms (or tankers FPSOs - FSOs) and, short before reaching the platform, they pass inside a stiffener, which is fixed to a bell mouth of a steel tube, also called I-tube.
  • the present invention has the objective of providing a protection for the flexible tube, which considerably increases its useful life, thus avoiding stoppages for maintenance and substantially reducing the expenditures and loss of profits, as well as possible environmental accidents.
  • a protector of a flexible tube against wear by friction the flexible tube being in contact with a stiffener in an I-tube, said stiffener bearing a trumpet, the protecting assembly being located between the outer surface of the flexible tube and the inner wall of the I-tube and comprising rotary pieces that are axially movable relative to the inner wall of the I-tube.
  • the protecting assembly according to the invention may comprise, for instance, an annular piece fixed to the flexible tube, wherein the stiffener is mounted to said annular piece and becomes integral with the flexible tube and may follow all the movements of the flexible tube, and wherein the annular piece rests against the internal wall of the I-tube and guides the displacements of the stiffener inside the I-tube.
  • the stiffener may have a centralizer that rests against the internal wall of the I- tube and guides the displacements of the stiffener inside the I-tube.
  • the protecting assembly according to the invention may be char- acterized, for instance, in that the trumpet is mounted on the stiffener by means of pieces that permit rotary and axial movement of the trumpet with respect to the stiffener, wherein the stiffener is fixed to the I-tube and said trumpet is kept integral with the flexible tube by friction.
  • Said pieces comprise an antifriction layer arranged between the internal wall of the stiffener and the external wall of the trumpet; a friction layer arranged between the internal wall of the trumpet and the outer surface of the flexible tube; and at least two elastic elements arranged between the internal wall of the stiffener and the external wall of the trumpet, wherein one elastic element is located above an annular shoulder of the trumpet and the other elastic element below said shoulder.
  • the antifriction layer mentioned above may be arranged on the internal wall of the stiffener or on the external wall of the trumpet, while the friction layer may be of a synthetic material.
  • the above-cited flexible tube may be, for example, a riser, a jumper or an umbilical.
  • the assembly for protection against wear by friction according to the invention as a great advantage, enables the flexible tube to have longer useful life than the flexible tubes arranged in l-tubes according to the prior art.
  • FIG. 1 is a section view of a first embodiment of the invention.
  • FIG. 2 is a section view of a second embodiment of the invention.
  • Figure 1 shows an I-tube 1 , at the end of which a bell mouth 2 may be fixed.
  • An stiffener 3, with a trumpet 4 fixed to its upper end, is partially arranged inside the I-tube 1.
  • a flexible tube 5 passes inside the stiffener 3 and an annular piece 6, which may be, for example, a collar or a retractile ring, is fixed to said flexible tube 5.
  • the stiffener 3 is mounted on the annular piece 6 and, in this way, it remains integral with the flexible tube and may follow all the movements of the latter.
  • the stiffener 3 further presents a cen- tralizer 7, which rests against the internal wall of the I-tube 1 and guides the displacements of the stiffener 3 inside the I-tube 1.
  • the fixation of the stiffener/trumpet to the flexible tube 5 may be effected by means of a split friction collar 6, installed directly in the flexible tube, with or without the use of a centralizer, or may be made by using a retractile ring installed directly in the insert of the stiffener 3 either inside or outside it.
  • Figure 2 shows a second embodiment of the invention, where one can see the I-tube 1 , which may have a bell mouth 2 at the end. This figure further shows the stiffener 3 with the trumpet 4 inside it and the flexible tube 5 passing inside the stiffener and the trumpet 4.
  • the stiffener 3 is fixed to the I-tube 1 and the trumpet 4 has, on the internal wall, a friction layer 8 that keeps the trumpet integral with the flexible tube 5 by friction.
  • At least two elastic elements 9 arranged between the internal wall of the stiffener 3 and the external wall of the trumpet 4 actuate on an annular shoulder 10 of the trumpet 4 and guarantee the axial movement and the respective return of the trumpet 4.
  • the antifriction layer 11 ar- ranged between the internal wall of the stiffener 3 and the external wall of the trumpet 4.
  • This trumpet 4 may be inserted inside of the stiffener 3.
  • This removable trumpet can be steel covered (lining) with a low friction coefficient material 11 , as shown in figures 3 and 4 or be totally constituted with a low friction coefficient material 12 (except the metallic topside split fixing part), as shown in figures 5 and 6. So, as the split trumpet has at its internal part a low friction material, which will be in contact with the tube outer sheath, the wear will be reduced.
  • the trumpet may be a split trumpet in two part.
  • the split trumpet is removable it can be removed from time to time and inspected in order to observe if the low friction material still have a thickness that wont allow the tube outer sheath wear. But if this thickness is considered reduced, this trumpet could be substituted by a new one. This operation can be done with the tubes already installed offshore without stopping the line work. So the expenses and income losses reducing is great and the wear at the tube outer sheath could be controlled and reduced.
  • topside part metallic made with bolts that has the function of holding the internal part of the split trumpet and also perform the closure of the split parts.
  • the metallic parts could be painted or protected with any kind of metallic corrosion treatment.
  • the Split Removable Trumpet for Bending Stiffeners can be installed/reinstalled onshore or offshore.

Landscapes

  • 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)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Joints Allowing Movement (AREA)
  • Supports For Pipes And Cables (AREA)
  • Earth Drilling (AREA)

Abstract

An assembly for protecting a flexible tube against wear by friction, the flexible tube (5) being in contact with a stiffener (3) in an I-tube (1), said stiffener (3) bearing a trumpet (4), the protecting assembly being arranged between the external surface of the flexible tube (5) and the internal wall of the I-tube (1), and comprises pieces (4, 6, 7, 8, 9, 10, 11) that are rotary and axially movable relative to the internal wall of the I-tube (1).

Description

Specification of the Patent of Invention for: "AN ASSEMBLY FOR PROTECTING A FLEXIBLE TUBE AGAINST WEAR BY FRICTION"
The present invention relates to an assembly for protecting a flexible tube against wear by friction, particularly for protecting risers, jumpers or umbilicals in contact with stiffeners arranged in l-tubes. Prior Art and Drawbacks of the Prior Art
As it is widely known, flexible tubes are connected to platforms (or tankers FPSOs - FSOs) and, short before reaching the platform, they pass inside a stiffener, which is fixed to a bell mouth of a steel tube, also called I-tube.
Due to the movement of the waves and of the tides, the flexible tube moves uninterruptedly and makes friction with the internal wall of the stiffener, which causes breakage of the external cover of the flexible tube. This fact may causes premature failure of the riser and, consequently, the operation has to be stopped for replacement of the tube, which entails very high expenses, as well as loss of profits with due to the stoppage of production. Objectives and Advantages of the Invention
The present invention has the objective of providing a protection for the flexible tube, which considerably increases its useful life, thus avoiding stoppages for maintenance and substantially reducing the expenditures and loss of profits, as well as possible environmental accidents.
This objective is achieved by means of a protector of a flexible tube against wear by friction, the flexible tube being in contact with a stiffener in an I-tube, said stiffener bearing a trumpet, the protecting assembly being located between the outer surface of the flexible tube and the inner wall of the I-tube and comprising rotary pieces that are axially movable relative to the inner wall of the I-tube.
Thus, one of the advantages of the invention consists in elimi- nating the relative movement between the riser or umbilical and the stiffening assembly/trumpet. The concepts indicated below are capable of eliminating this movement and, therefore, solving the abrasion problem. The protecting assembly according to the invention may comprise, for instance, an annular piece fixed to the flexible tube, wherein the stiffener is mounted to said annular piece and becomes integral with the flexible tube and may follow all the movements of the flexible tube, and wherein the annular piece rests against the internal wall of the I-tube and guides the displacements of the stiffener inside the I-tube. Alternatively, the stiffener may have a centralizer that rests against the internal wall of the I- tube and guides the displacements of the stiffener inside the I-tube.
The protecting assembly according to the invention may be char- acterized, for instance, in that the trumpet is mounted on the stiffener by means of pieces that permit rotary and axial movement of the trumpet with respect to the stiffener, wherein the stiffener is fixed to the I-tube and said trumpet is kept integral with the flexible tube by friction.
Said pieces comprise an antifriction layer arranged between the internal wall of the stiffener and the external wall of the trumpet; a friction layer arranged between the internal wall of the trumpet and the outer surface of the flexible tube; and at least two elastic elements arranged between the internal wall of the stiffener and the external wall of the trumpet, wherein one elastic element is located above an annular shoulder of the trumpet and the other elastic element below said shoulder.
The antifriction layer mentioned above may be arranged on the internal wall of the stiffener or on the external wall of the trumpet, while the friction layer may be of a synthetic material.
The above-cited flexible tube may be, for example, a riser, a jumper or an umbilical.
Thus, the assembly for protection against wear by friction according to the invention, as a great advantage, enables the flexible tube to have longer useful life than the flexible tubes arranged in l-tubes according to the prior art. The invention will now be described in greater detail, by way of example, with reference to the attached figures.
- Figure 1 is a section view of a first embodiment of the invention; and
- Figure 2 is a section view of a second embodiment of the invention; and
- Figures 3 to 6 show an alternative solution using a removable trumpet.
Figure 1 shows an I-tube 1 , at the end of which a bell mouth 2 may be fixed. An stiffener 3, with a trumpet 4 fixed to its upper end, is partially arranged inside the I-tube 1. A flexible tube 5 passes inside the stiffener 3 and an annular piece 6, which may be, for example, a collar or a retractile ring, is fixed to said flexible tube 5. The stiffener 3 is mounted on the annular piece 6 and, in this way, it remains integral with the flexible tube and may follow all the movements of the latter. The stiffener 3 further presents a cen- tralizer 7, which rests against the internal wall of the I-tube 1 and guides the displacements of the stiffener 3 inside the I-tube 1. The fixation of the stiffener/trumpet to the flexible tube 5 may be effected by means of a split friction collar 6, installed directly in the flexible tube, with or without the use of a centralizer, or may be made by using a retractile ring installed directly in the insert of the stiffener 3 either inside or outside it. Figure 2 shows a second embodiment of the invention, where one can see the I-tube 1 , which may have a bell mouth 2 at the end. This figure further shows the stiffener 3 with the trumpet 4 inside it and the flexible tube 5 passing inside the stiffener and the trumpet 4. The stiffener 3 is fixed to the I-tube 1 and the trumpet 4 has, on the internal wall, a friction layer 8 that keeps the trumpet integral with the flexible tube 5 by friction. At least two elastic elements 9 arranged between the internal wall of the stiffener 3 and the external wall of the trumpet 4 actuate on an annular shoulder 10 of the trumpet 4 and guarantee the axial movement and the respective return of the trumpet 4. One further observes, in this figure, the antifriction layer 11 , ar- ranged between the internal wall of the stiffener 3 and the external wall of the trumpet 4.
An alternative solution may be reached using a removable trum- pet. This trumpet 4 may be inserted inside of the stiffener 3. This removable trumpet can be steel covered (lining) with a low friction coefficient material 11 , as shown in figures 3 and 4 or be totally constituted with a low friction coefficient material 12 (except the metallic topside split fixing part), as shown in figures 5 and 6. So, as the split trumpet has at its internal part a low friction material, which will be in contact with the tube outer sheath, the wear will be reduced.
Among the materials of low friction coefficient we have as example the teflon and their variations, nylon, polyurethane, etc. Furthermore, the trumpet may be a split trumpet in two part. As the split trumpet is removable it can be removed from time to time and inspected in order to observe if the low friction material still have a thickness that wont allow the tube outer sheath wear. But if this thickness is considered reduced, this trumpet could be substituted by a new one. This operation can be done with the tubes already installed offshore without stopping the line work. So the expenses and income losses reducing is great and the wear at the tube outer sheath could be controlled and reduced.
There are a topside part metallic made with bolts that has the function of holding the internal part of the split trumpet and also perform the closure of the split parts. The metallic parts could be painted or protected with any kind of metallic corrosion treatment. The Split Removable Trumpet for Bending Stiffeners can be installed/reinstalled onshore or offshore.
In addition to the embodiments presented before, the same inventive concept may be applied to other alternatives or possibilities of use of the invention. Thus, it will be understood that the present invention should be interpreted in a broad way, its comprehension being determined by the terms of the accompanying claims.

Claims

1. An assembly for protecting a flexible tube against wear by friction, the flexible tube (5) being in contact with a stiffener (3) in an I-tube (1 ), the said stiffener (3) bearing a trumpet (4), characterized in that the protect- ing assembly is located between the external surface of the flexible tube (5) and the internal wall of the I-tube (1 ), and comprises pieces (4, 6, 7, 8, 9, 10, 11 ) that are rotary and axially movable relative to the internal wall of the I- tube (1 ).
2. A protecting assembly according to claim 1 , characterized by comprising an annular piece (6) fixed to the flexible tube (5), wherein the stiffener (3) is mounted to the annular piece (6) and becomes integral with the flexible tube (5), being able to follow all the movements of the flexible tube, and the annular piece (6) rests against the internal wall of the I-tube (1 ) and guides the displacements of the stiffener (3) inside the I-tube (1 ).
3. A protecting assembly according to claim 1 or 2, characterized by comprising an annular piece (6) fixed to the flexible tube (5), wherein the stiffener (3) is mounted to the annular piece (6) and becomes integral with the flexible tube (5), being capable of following all the movements of the flexible tube, the stiffener (3) presenting a centralizer (7) that rests against the internal wall of the I-tube (1 ) and guides the displacements of the stiffener (3) inside the I-tube (1).
4. A protecting assembly according to claim 1 , characterized in that the trumpet (4) is mounted on the stiffener (3) by means of pieces (8, 9, 10, 11) that permit rotary and axial movement of the trumpet (4) relative to the stiffener (3), wherein the stiffener (3) is fixed to the I-tube (1 ) and said trumpet (4) remains integral with the flexible tube (5) by friction.
5. A protecting assembly according to claim 1 or 4, characterized in that the pieces comprise an antifriction layer (11 ) arranged between the internal wall of the stiffener (3) and the external wall of the trumpet (4); a fric- tion layer (8) arranged between the internal wall of the trumpet (4) and the outer surface of the flexible tube (5); and at least two elastic elements (9) arranged between the internal wall of the stiffener (3) and the external wall of the trumpet (4), wherein one elastic element (9) is located above an annular shoulder (10) of the trumpet (4) and the other elastic element (9) being located below said shoulder (10).
6. A protecting assembly according to claim 1 , 4, or 5, character- ized in that the antifriction layer (11 ) is arranged on the internal wall of the stiffener (3).
7. A protecting assembly according to claim 1 , 4, or 5, characterized in that the antifriction layer (11) is arranged on the external wall of the trumpet (4).
8. A protecting assembly according to claim 1 , 4, or 5, characterized in that the friction layer (8) is of a synthetic material.
9. A protecting assembly according to one of the preceding claims, characterized in that the flexibly tube (5) is a riser or a jumper.
10. A protecting assembly according to one of the preceding claims, characterized in that the flexible tube (5) is an umbilical.
EP03779586A 2002-12-18 2003-12-18 An assembly for protecting a flexible tube against wear by friction Expired - Lifetime EP1576254B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BR0205417 2002-12-18
BR0205417A BR0205417B1 (en) 2002-12-18 2002-12-18 protective assembly of a flexible tube against frictional wear.
PCT/BR2003/000197 WO2004055319A1 (en) 2002-12-18 2003-12-18 An assembly for protecting a flexible tube against wear by friction

Publications (2)

Publication Number Publication Date
EP1576254A1 true EP1576254A1 (en) 2005-09-21
EP1576254B1 EP1576254B1 (en) 2013-02-20

Family

ID=32513922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03779586A Expired - Lifetime EP1576254B1 (en) 2002-12-18 2003-12-18 An assembly for protecting a flexible tube against wear by friction

Country Status (6)

Country Link
EP (1) EP1576254B1 (en)
AU (1) AU2003287790A1 (en)
BR (1) BR0205417B1 (en)
DK (1) DK1576254T3 (en)
NO (1) NO334893B1 (en)
WO (1) WO2004055319A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR0303446B1 (en) * 2003-09-03 2014-04-08 Technip France STRONGER FIXING ASSEMBLY FOR FLEXIBLE PIPE PROTECTIVE ASSEMBLY
GB0506406D0 (en) * 2005-03-30 2005-05-04 Crp Group Ltd Connector
BR112019007789B1 (en) 2016-10-17 2023-01-24 National Oilwell Varco Denmark I/S OFFSHORE INSTALLATION

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130995A (en) * 1977-11-03 1978-12-26 Standard Oil Company (Indiana) VMP riser horizontal bearing
GB9807968D0 (en) * 1998-04-16 1998-06-17 Coflexip Connector for marine risers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004055319A1 *

Also Published As

Publication number Publication date
WO2004055319A1 (en) 2004-07-01
AU2003287790A1 (en) 2004-07-09
NO20052973D0 (en) 2005-06-17
DK1576254T3 (en) 2013-05-27
EP1576254B1 (en) 2013-02-20
BR0205417B1 (en) 2011-01-25
NO334893B1 (en) 2014-06-30
NO20052973L (en) 2005-09-12
BR0205417A (en) 2004-07-20

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