EP2143817A2 - Nahtloses stahlrohr für aufwältigungssteigrohr und herstellungsverfahren - Google Patents

Nahtloses stahlrohr für aufwältigungssteigrohr und herstellungsverfahren Download PDF

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Publication number
EP2143817A2
EP2143817A2 EP08753716A EP08753716A EP2143817A2 EP 2143817 A2 EP2143817 A2 EP 2143817A2 EP 08753716 A EP08753716 A EP 08753716A EP 08753716 A EP08753716 A EP 08753716A EP 2143817 A2 EP2143817 A2 EP 2143817A2
Authority
EP
European Patent Office
Prior art keywords
max
tube
work
seamless steel
mpa
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.)
Withdrawn
Application number
EP08753716A
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English (en)
French (fr)
Inventor
Alfonso Izquierdo Garcia
Héctor Manuel QUINTANILLA CARMONA
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.)
Tubos de Acero de Mexico SA
Original Assignee
Tubos de Acero de Mexico SA
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 Tubos de Acero de Mexico SA filed Critical Tubos de Acero de Mexico SA
Publication of EP2143817A2 publication Critical patent/EP2143817A2/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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

  • This invention relates to a seamless steel tube for risers used in work-over operations.
  • the requirements for operating a well in the seabed involve a plurality or systems and equipment including drilling, production and work-over risers.
  • a drilling riser is a pipe between a seabed blow-out preventer (BOP) and a floating drilling rig which is a drilling unit not permanently fixed to the seabed such as a drillship, a semi-submersible or jack-up unit.
  • BOP seabed blow-out preventer
  • a drilling rig is meant to be the derrick and its associated machinery.
  • a production riser is a pipeline carrying oil or gas that joins a seabed wellhead to a deck of a production platform or a tanker loading platform.
  • a work-over riser is a flowline which is used to carry on a well work-over, which is performed on an existing well and may involve re-evaluating the production formation, clearing sand from producing zones, jet lifting, replacing downhole equipment, deepening the well, acidizing or fracturing or improving the drive mechanism.
  • these pipes need to have a good welding performance just to be welded to weld-on-connectors to build the string.
  • a first object of the invention is to provide a seamless steel tube to be used as a riser in work-over operations with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter to reduce the weight of the riser string.
  • a second object is to provide a seamless steel tube for the application as a work-over riser with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter to reduce the bending loads in the wellhead and the platform interface.
  • a third object of the invention is to provide a method of manufacturing of a seamless steel tube for the application as a work-over riser with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter using upsetting techniques.
  • a fourth object of the invention is to provide a method of manufacturing of a seamless steel tube for the application as a work-over riser with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter using machining techniques.
  • a fifth object of the invention is to provide a method of manufacturing of a seamless steel tube for the application as a work-over riser with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter able to guarantee the mechanical characteristics to have high fatigue and corrosion resistance and a good welding performance.
  • the tubes used as work-over risers may be reused meaning an economical saving.
  • the present invention describes a seamless steel tube to be used as a riser in work-over operations with a specific chemistry design and microstructure consisting of a geometry in which ends of the tube have an increased wall thickness and outer diameter.
  • the alloy design is based on high strength requirements.
  • the main features of the chemical composition of the tube include 0.23-0.28 wt % C, 0.45 -0.65 wt % Mn, and other alloying elements such as Mo, and Cr to achieve the required percentage of martensitic transformation.
  • microalloying elements such as Ti and Nb are used as grain refiners.
  • the production route for manufacturing the upset seamless pipe for the application of as Work Over Riser includes the following steps: steel casting (Continuous Cast Bar), seamless pipe rolling (MPM process), pipe ends upsetting, heat treatment, destructive testing (including microcleanliness, austenitic grain size, calculate % of martensitic transformation, tensile, hardness, toughness, SSC testing), dimensional control of pipe body and upset ends (outside diameter, out of roundness, excentricity, straightness, internal diameter, length), machining of external and internal upset end, dimensional control (internal diameter, outside diameter and machined length), drift testing at the upset ends, non-destructive testing (NDT) of upset ends, weighing, measuring and marking, external surface visual inspection, UT inspection of pipe body and UT inspection of upset ends (cylindrical section only).
  • the production route for manufacturing the machining seamless pipe for the application of as Work Over Riser includes the following steps: steel casting (Continuous Cast Bar), seamless pipe rolling (MPM process), heat treatment, destructive testing (including microcleanliness, austenitic grain size, calculate % of martensitic transformation, tensile, hardness, toughness, SSC testing), dimensional control of pipe body (outside diameter, out of roundness, straightness, internal diameter, length), machining from external surface the complete length of the pipe by programming CNC lath machine in order to achieve final dimensions at the ends, dimensional control (internal diameter, outside diameter, out of roundness, straightness, and length) of pipe body and machined ends, drift testing at the ends, non-destructive testing (NDT) of ends, weighing, measuring and marking, external surface visual inspection, UT inspection of machined pipe body and UT inspection of ends (cylindrical section only).
  • the chemical composition of the seamless steel tube of the present invention comprises in weight per cent: carbon 0.23-0.29, manganese 0.45-0.65, silicon 0.15-0.35, chromium 0.90-1.20, molybdenum 0.70- 0.90, nickel 0.20 max, nitrogen 0.010 max, boron 0.0010-0.0030, aluminum 0.010-0.045, sulfur 0.005 max, phosphorus 0.015 max, titanium 0.005-0.030, niobium 0.020-0.035, copper 0.15 max, arsenic 0.020 max, calcium 0.0040 max, tin 0.020 max, hydrogen 2.4 ppm max, the rest are iron and inevitable impurities.
  • a more preferred composition comprises: carbon 0.25-0.28, manganese 0.48-0.58, silicon 0.20-0.30, chromium 1.05-1.15, molybdenum 0.80- 0.83, nickel 0.10 max, nitrogen 0.008 max, boron 0.0016-0.0026, aluminum 0.015-0.045, sulfur 0.0030 max, phosphorus 0.010 max, titanium 0.016-0.026, niobium 0.025-0.030, copper 0.10 max, arsenic 0.020 max, calcium 0.0040 max, tin 0.015 max, hydrogen 2.0 ppm max, the rest are iron and inevitable impurities.
  • the seamless steel tubes have a geometry, in which ends of tubes have an increased wall thickness and outer diameter, and following mechanical properties:
  • the geometry of seamless steel tube of the present invention and the mechanical characteristics are obtained by two methods of manufacturing: upsetting and machining.
  • the upsetting manufacturing method comprises the following steps:
  • the machining manufacturing method comprises the following steps:
  • Both methods are also performed providing a seamless steel pipe with the preferred composition, as disclosed above.
  • the seamless steel tube of the present invention may be divided into two zones. As shown in Figure 1 , there is an increased wall thickness and diameter end with internal and external length (upsetting or machined zone) and the tube body. Due to a combination of the manufacturing methods and the chemistry design, both the whole tube body and the ends have the same yield strength of at least 620 MPa (90 ksi) (YS) and at most 724 MPa (105 ksi), a Yield to Tensile Ratio not greater than 0.92, also, the same ultimate tensile strength (UTS) of at least 690 MPa (100 ksi), elongation of at least 18%, hardness Rockwell of at most 25.4 HRC (value as per API 5CT means average per row) and corrosion resistance (Compliance with NACE, acceptance criteria: Passing SSC Method A test as per NACE TM0177-2005, using test solution (a), testing at 85%SMYS, test period 720 hours). Prior Austenitic Grain Size is 5 or less. The product
  • the tubes may be utilized in sour and non-sour service.
  • the tubes' nominal diameter to be upsetted ends may be from 4 1 ⁇ 2" to 10 3 ⁇ 4".
  • the tubes' nominal diameter which ends will to be machined may be from 4 1 ⁇ 2" to 18" due to the manufacturing facilities.
  • the tubes' thickness ranges from 10 mm to 50 mm.
  • the upsetting manufacturing operation was performed following the steps of:
  • the austenitic grain size was measured on as-quenched material by the saturation method as per ASTM E-112. As shown in Figure 6 , the grain size reported on the samples were 9/10 in the pipe body which was above the required size since the minimum required was 5. The upset samples showed a grain size of 8/9 and 9/10 complying with the specifications as illustrated in Figure 6 .
  • the transversal face to the rolling axis was metallographically prepared and etched with Nital 2% to perform microstructural observations with an optical microscope.
  • Nital Solution of 2% of Nitric acid in Ethyl Alcohol.
  • microstructures observed in as-quenched material were mainly martensitic with over 95% of martensitic transformation through the entire thickness of the pipe on both pipe body and upset which indicates that the temperature at which the pipe entered the quenching stage and the quenching itself were homogeneous.
  • the microstructures observed in tempered material, tempered martensite was present through the thickness.
  • the pipe was rolled in a heavy wall condition.
  • the wall thickness was about 44 mm.
  • Example 2 As in Example 1, a mechanical characterization was performed, calculating the % of martensitic transformation from the as-quenched material. On the quenched and tempered material, tensile, hardness, and toughness tests were performed on both machined ends and pipe body sections. Specifications were met; good hardenability, yield strength values of over 94 ksi as-tempered HRC values below the maximum allowed (25.4 HRC) and absorbed energy higher than 100 Joules at the specified temperature of -20°C.
  • Homogeneity in tensile properties, hardness and toughness test results are a consequence of a very homogenous microstructure through the wall on both machined ends and pipe body in the as quenched and tempered condition.
  • Microstructural observations of as-quenched material at the pipe machined body and the ends zones reveal a prior austenitic grain size of 8/9 in both zones measured by the saturation method as per ASTM E-112.
  • the modified end on the analyzed sample showed a grain size of 8/9 complying with the specifications as shown in Figure 12 .
  • the transversal face to the rolling axis was metallographically prepared and etched with Nital 2% to perform microstructural observations with an optical microscope.
  • Nital Solution of 2% of Nitric acid in Ethyl Alcohol.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Extraction Processes (AREA)
  • Rod-Shaped Construction Members (AREA)
EP08753716A 2007-04-17 2008-04-17 Nahtloses stahlrohr für aufwältigungssteigrohr und herstellungsverfahren Withdrawn EP2143817A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MX2007004600A MX2007004600A (es) 2007-04-17 2007-04-17 Un tubo sin costura para la aplicación como secciones verticales de work-over.
PCT/MX2008/000054 WO2008127084A2 (es) 2007-04-17 2008-04-17 Un tubo de acero sin costura para la aplicación como columnas ascendientes de work-over y método para fabricar el mismo

Publications (1)

Publication Number Publication Date
EP2143817A2 true EP2143817A2 (de) 2010-01-13

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EP08753716A Withdrawn EP2143817A2 (de) 2007-04-17 2008-04-17 Nahtloses stahlrohr für aufwältigungssteigrohr und herstellungsverfahren

Country Status (8)

Country Link
US (1) US20100193085A1 (de)
EP (1) EP2143817A2 (de)
AR (1) AR066080A1 (de)
BR (1) BRPI0810005A2 (de)
CA (1) CA2682959A1 (de)
MX (1) MX2007004600A (de)
NO (1) NO20093069L (de)
WO (1) WO2008127084A2 (de)

Cited By (2)

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EP2181240B1 (de) * 2007-07-02 2018-08-29 Forum US, Inc. Zentrierstruktur für ein röhrenförmiges glied und herstellungsverfahren dafür
CN109161650A (zh) * 2018-10-30 2019-01-08 中车戚墅堰机车车辆工艺研究所有限公司 一种低合金铸钢、制造方法及其应用

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WO2008127084A2 (es) 2008-10-23
MX2007004600A (es) 2008-12-01
AR066080A1 (es) 2009-07-22
US20100193085A1 (en) 2010-08-05
WO2008127084A4 (es) 2009-03-19
CA2682959A1 (en) 2008-10-23
NO20093069L (no) 2009-12-30
WO2008127084A3 (es) 2008-12-31

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