EP2340349B1 - Methode pour alleger une colonne montante avec piece d'usure optimisee - Google Patents

Methode pour alleger une colonne montante avec piece d'usure optimisee Download PDF

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Publication number
EP2340349B1
EP2340349B1 EP09747874.7A EP09747874A EP2340349B1 EP 2340349 B1 EP2340349 B1 EP 2340349B1 EP 09747874 A EP09747874 A EP 09747874A EP 2340349 B1 EP2340349 B1 EP 2340349B1
Authority
EP
European Patent Office
Prior art keywords
riser
end part
elastic limit
steel
sections
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.)
Not-in-force
Application number
EP09747874.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2340349A1 (fr
Inventor
Jean Guesnon
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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Publication of EP2340349A1 publication Critical patent/EP2340349A1/fr
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Publication of EP2340349B1 publication Critical patent/EP2340349B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • E21B17/02—Couplings; joints
    • E21B17/08—Casing joints
    • E21B17/085—Riser connections
    • E21B17/0853—Connections between sections of riser provided with auxiliary lines, e.g. kill and choke lines
    • 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
    • E21B17/1035—Wear protectors; Centralising devices, e.g. stabilisers for plural rods, pipes or lines, e.g. for control lines

Definitions

  • the present invention relates to the field of drilling and exploitation of oil or gas deposits located at sea. It relates to a specific column riser architecture.
  • a riser commonly called “riser” consists of a set of tubular elements called “joints”, assembled by mechanical connectors.
  • the tubular elements generally consist of a main tube whose ends are welded connection pieces.
  • the main tube is provided with auxiliary lines commonly called “kill line”, “choke line”, “booster line” and “hydraulic line” which allow the circulation of fluids between the bottom and the surface.
  • Auxiliary lines are usually installed around the main tube, hence their common name for peripheral lines.
  • the tubular elements are assembled on the drilling site, from a floating support. The column descends into the water portion as the assembly of the tubular elements, until reaching the wellhead located on the seabed. Float elements are arranged along the column to reduce weight in the water.
  • the present invention proposes to modify the connecting piece, commonly called “replaceable stab", of the tubes forming the auxiliary lines, in order to reduce the sealing section of the connecting piece, in order to reduce the forces applied to the assembly of the riser and, therefore, reduce the size of the various elements constituting the riser, including reducing the thickness of the tubes and the diameter of the floats.
  • the invention describes a method for reducing the weight of a riser for drilling an offshore well according to claim 1.
  • the invention also describes a riser obtained by implementing the method according to the invention.
  • said material may be composed of a metal alloy comprising at least 80% by weight of titanium, for example Ti-6-4 or Ti-6-6-2.
  • said material may be composed of a steel and at least the inner surface of said end piece may be coated with a protective layer against corrosion.
  • each of said tubular sections may comprise a tubular metal body shrunk by windings of fibers coated with polymer matrix.
  • the figure 1 schematically a riser 1 installed at sea, intended to drill a well P to exploit the deposit G.
  • the riser 1 extends the well P and extends from the wellhead 3 to the floating support 2, for example a platform floating, a barge or a boat.
  • the wellhead 3 is provided with shutters commonly called “BOP” or "Blow Out Preventer”.
  • the riser 1 consists of the assembly of several tube sections 4, as shown in detail in FIG. figure 2 , assembled end to end by the connectors 5.
  • the connectors may be of the type bayonet connector for example described by the documents FR 2,432,672 and FR 2 866 942 or flange type connector, or any other type of connector.
  • auxiliary lines are arranged in parallel and at the periphery of the main tube formed by the assembly of the tubes 4.
  • the auxiliary lines called “kill line” and “choke line” are used to circulate fluids between the well and the surface, or conversely, when the BOPs are closed in order, in particular, to enable the control procedures to be carried out on the flow of fluids under pressure into the well.
  • the auxiliary line called “booster line” allows to inject mud at the foot of the riser.
  • the auxiliary line (s) called “hydraulic” line (s) “allows (tent) to transfer a fluid under pressure to control the" BOP "shutters of the wellhead.
  • the auxiliary lines consist of several tube sections 7 attached to the main tube elements and assembled at the connectors 5.
  • the tubes 7 can be mechanically reinforced.
  • elements of optimized resistance tubes are used by a hoop made of a composite material composed of fibers coated with a polymer matrix.
  • a tube hooping technique can be one that consists in winding under tension of the strips of composite material around a metal tubular body, described in the documents FR 2,828,121 , FR 2 828 262 , US 4,514,254 .
  • composite material ribbons are wound around the metal tubular body without inducing significant stresses in the metal tubular body. Then, a determined pressure is applied inside the metal body so that the metal body deforms plastically. After returning to the zero pressure, residual compressive stresses remain in the metal body and tensile stresses in the composite material ribbons.
  • the riser 1 is connected to the wellhead 3 via the "L.M.R.P.” or “Lower Marine Riser Package” 8.
  • the connection between the connecting means 8 and the riser may comprise a hinge, commonly called “joint lease” or “joint flex", which allows an angular deflection of several degrees.
  • the riser 1 is hooked to the floating support 2 by a tensioner system 9, for example consisting of a set of hydraulic cylinders, oleo-pneumatic accumulators, transfer cables and return pulleys.
  • a tensioner system 9 for example consisting of a set of hydraulic cylinders, oleo-pneumatic accumulators, transfer cables and return pulleys.
  • the hydraulic continuity of the riser 1 to the drilling floor is achieved through a sliding joint 10, commonly called “slip joint”, and a hinge 11 which allows an angular deflection of several degrees.
  • Floats 12 made in the form of syntactic foam modules or other materials of lower density than that of seawater are attached to the main tube 4.
  • the floats 12 allow to lighten the riser 1 when immersed and to reduce the voltage that it is necessary to apply at the top of the riser by means of the tensioners.
  • the figure 2 represents in detail a riser section.
  • the main tube 4 is provided at its ends with the elements of a connector 5 which are able to cooperate with each other.
  • the floats 12 are distributed along the tube 4.
  • the auxiliary pipe 7 is positioned at the periphery of the floats 12.
  • the riser 1 of the figure 1 consists of an assembly of several sections described with reference to the figure 2 .
  • the figure 3 represents in detail a connector 5 which makes it possible to assemble two tubes referenced 4, as well as two tubes referenced 7, on the figure 1 .
  • the two tubes 4 of the figure 1 are referenced 4a and 4b
  • the two tubes 7 of the figure 1 are referenced 7a and 7b.
  • the end of a tube 4a is provided with a male tubular piece 21 which cooperates with a female tubular piece 20 constituting the end of the adjacent tube 4b.
  • a locking ring 22 is mounted on the male part 21.
  • the female tubular part 20 comprises tenons (that is to say shoulders extending in the radial direction on a small angular portion) which cooperate with the pins of the locking ring 22 to lock the assembly of the part 20 with the part 21.
  • the parts 20 and 21 are welded to the ends of the tubes 4b and 4a.
  • the ends of the tubes 7a and 7b are respectively provided with female connector parts 24 and 23.
  • the parts 23 and 24 are generally welded to the ends of the tubes 7b and 7a.
  • a male end 25 of tubular shape cooperates with the parts 23 and 24 to ensure the hydraulic continuity of the auxiliary pipe.
  • the tip 25 is screwed inside the female connector 24.
  • the seals 26 mounted in grooves formed inside the female connector 24 seals the fixed connection between the nozzle 25 and the fitting 24.
  • the connector 23 has an inside diameter slightly greater than the outside diameter of the end of the nozzle 25 so as to allow it to fit into it and slide.
  • the tube 7b is held fixed relative to the tube 4b by means of the connection 28 which connects the connecting piece 23 to the connector 5.
  • the tube 7a is simply guided by the support plate 29 which allows the sliding of the male end 25 through an orifice made in said plate 29.
  • the male end 25 freely enters the female end 23 of the adjacent line and, rubbing on the seals 27 in opposite, automatically ensures the hydraulic sealing of the connection.
  • the sliding stroke is calculated so that in the worst situation of elongation of the main tube and shortening of the tube of the auxiliary pipe under the effect of forces, moments, pressures and temperatures, the hydraulic continuity of the link is maintained.
  • a safety nut 30 screwed onto the spigot 25 bears on the plate 29 to prevent disengagement.
  • the spigot 25 is a wear part, also called “replaceable stab", the replacement by simple screwing / unscrewing can be performed if necessary during the life of the "riser".
  • the effective tension must be positive in all sections with a margin depending on the operating conditions (water depth, density and fluid pressure, etc.) and on the environment (swell, currents,. ..) considered.
  • this effective voltage at the z-coordinate is to consider that it is equal to the sum of the voltages in the various components (solid and fluids) of the column. If the column were a simple tube, it would be the sum of the so-called “true” voltage in the wall (which generates stresses and deformations in the metal) and the (negative) voltage in the pressurized fluid located at the inside (due to the pressure of the mud), less the tension (also negative) exerted by the sea water (Archimedes thrust).
  • the effective tension in a line is simply expressed as a function of the seal section S seal and the pressure difference between the inside and the outside of the tube.
  • the present invention proposes to optimize the dimensioning of a riser by reducing as much as possible the sealing section S seal of the auxiliary ducts, in particular that of the safety lines ("kill line” and "choke line”) that support the strongest pressures. Due to the impact of the sealing section on the forces in the auxiliary lines 7 and the main tube 4, its reduction makes it possible to reduce globally and significantly the dimensions of the various elements of the riser.
  • the inside diameter of the cylindrical end piece 25 is referenced D int .
  • the inside diameter of the auxiliary pipe is generally imposed by the users of the "riser” so as to limit the losses of load in the line to acceptable values and compatible with the procedures of control of blowout.
  • the inside diameter D int of the spigot 25 is usually equal to the specified inside diameter of the auxiliary pipe.
  • the outer diameter D ext of the nozzle 25 can therefore be determined by calculating the stresses exerted on the nozzle under the effect of the fluid pressure internal and external and applying the criterion of the API which states that this constraint must not exceed 2/3 of the elastic limit Rp 0.2 of the material used to make the tip 25.
  • the elastic limit Rp 0.2 here is defined as the stress that causes a permanent residual strain of 0.2% in the material.
  • the various elements constituting the auxiliary lines are made of steel resistant to corrosion by H2S, for example to meet the ISO-15156-2 standard, international version of NACE MR0175-91.
  • H2S high corrosion resistance
  • steels with high corrosion resistance generally have relatively low mechanical performances and, conversely, high-strength steels corrode rapidly in the presence of fluids loaded with H2S and other acid gases often contained in the effluents from the wells. oil. Therefore, the various elements constituting an auxiliary pipe 7 are made of steel with good corrosion resistance, but whose elastic limit is in practice limited to 552 MPa.
  • the present invention proposes to make the male end 25 in a stronger material than the steel used to make the other elements of the column 1, in particular the tubes 7 and / or the connector 5 composed of the male tubular parts 21, female 20 and the ring 22.
  • a metal is chosen whose elastic limit is at least 25%, or even 49%, greater than the elastic limit of the steel of the tubes 7 and / or the connector 5.
  • An excellent value of the elastic limit of the metal of the endpiece 25 is at least 98% greater than the elastic limit of the steel of the tubes 7 and / or the connector 5.
  • a resistant material is chosen corrosion and which can be screwed into the fitting part 24.
  • the tip 25 is made of titanium alloy.
  • a titanium alloy Ti-6-4 alloy comprising, in percent by weight, at least 85% titanium, about 6% aluminum and 4% vanadium
  • Ti-6-6-2 comprising, in weight percent, about 6% aluminum, 6% vanadium and 2% tin and at least 80% titanium.
  • Ti-6-6-2 has a minimum elastic limit of 965 MPa in the annealed state and even 1100 MPa in the aged state.
  • the tip 25 may also be made of high tensile steel.
  • high tensile steel For example, it is possible to use X100 or X120 steels which respectively have an elastic limit of 690 MPa and 830 MPa.
  • the inner surface of the nozzle 25, that is to say the tubular surface in contact with the fluid is coated with a protective layer against corrosion.
  • the techniques that can be used are the deposition of a coating, commonly called "cladding", by bonding or explosion.
  • a coating may for example be made in a stainless steel.
  • the establishment of a coating can also be achieved for example by soldering or plasma powder spraying, and then reworking to the specified dimension.
  • each of the nozzles 25 forms a restriction of the internal passage in the auxiliary pipe 7. This restriction causes an additional pressure drop in the auxiliary pipe, which can be compensated for by a slight increase in the internal diameter of the tubes 7 in the current portion.
  • riser sizing examples presented below compare and illustrate the advantages of a riser provided with a titanium ferrule according to the invention with respect to a clastic riser.
  • Examples No. 2 and No. 3 propose a reduction in the outer sealing diameter D ext of the nozzle 25.
  • Example No. 2 the steel of the spigot 25 (and it only) was replaced by a titanium alloy with 6% aluminum and 4% vanadium (Ti-6-4) significantly more resistant.
  • the minimum elastic limit of Ti-6-4 is in fact 830 MPa.
  • this material is characterized by an excellent behavior in the marine environment and in the presence of fluid or gases charged with H 2 S and CO 2 .
  • Example No. 3 in addition to using the titanium alloy tip 25, a 1 ⁇ 2 "(12.7 mm) passage restriction is allowed inside the tip 25, c. i.e., the diameter D int is reduced to 88.9 mm (3.5 ").

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP09747874.7A 2008-10-29 2009-09-23 Methode pour alleger une colonne montante avec piece d'usure optimisee Not-in-force EP2340349B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0806016A FR2937676B1 (fr) 2008-10-29 2008-10-29 Methode pour alleger une colonne montante avec piece d'usure optimisee
PCT/FR2009/001137 WO2010049602A1 (fr) 2008-10-29 2009-09-23 Méthode pour alléger une colonne montante avec pièce d'usure optimisée

Publications (2)

Publication Number Publication Date
EP2340349A1 EP2340349A1 (fr) 2011-07-06
EP2340349B1 true EP2340349B1 (fr) 2017-11-15

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ID=40639614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09747874.7A Not-in-force EP2340349B1 (fr) 2008-10-29 2009-09-23 Methode pour alleger une colonne montante avec piece d'usure optimisee

Country Status (5)

Country Link
US (1) US8800666B2 (pt)
EP (1) EP2340349B1 (pt)
BR (1) BRPI0919950B1 (pt)
FR (1) FR2937676B1 (pt)
WO (1) WO2010049602A1 (pt)

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US10087687B2 (en) * 2012-04-02 2018-10-02 Cameron International Corporation Seal sub system
JP6198452B2 (ja) * 2013-05-08 2017-09-20 株式会社神戸製鋼所 中間媒体式気化器
US9453375B2 (en) * 2013-12-18 2016-09-27 Cameron International Corporation Riser with slim pin auxiliary line
FR3020655B1 (fr) * 2014-05-05 2016-05-06 Ifp Energies Now Troncon de colonne montante equipee d'une bague de verrouillage disposee entre le tube principal et le tube auxiliaire
FR3024748B1 (fr) * 2014-08-11 2016-09-02 Ifp Energies Now Connecteur de colonne montante equipee d'une bague de verrouillage externe
FR3045708B1 (fr) * 2015-12-17 2018-01-26 IFP Energies Nouvelles Connecteur pour assembler deux troncons de colonne montante avec bague de verrouillage interne et pions demontables
FR3045707B1 (fr) * 2015-12-17 2018-01-26 IFP Energies Nouvelles Connecteur pour assembler deux troncons de colonne montante avec bague de verrouillage externe et pions demontables
FR3070472B1 (fr) * 2017-08-24 2019-08-23 IFP Energies Nouvelles Element de conduite avec tube frette et embouts en acier a haute limite elastique, et procede pour faire evoluer une colonne montante avec un tel element de conduite
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US11536092B2 (en) * 2020-07-27 2022-12-27 Schlumberger Technology Corporation Breech lock connection for drilling riser auxiliary line
US11920422B2 (en) * 2021-08-27 2024-03-05 Schlumberger Technology Corporation Riser collet connector systems and methods

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Also Published As

Publication number Publication date
US20110209878A1 (en) 2011-09-01
US8800666B2 (en) 2014-08-12
FR2937676B1 (fr) 2010-11-19
FR2937676A1 (fr) 2010-04-30
WO2010049602A1 (fr) 2010-05-06
EP2340349A1 (fr) 2011-07-06
BRPI0919950A2 (pt) 2016-02-16
BRPI0919950B1 (pt) 2019-07-16

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