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  • Drill Pip

    e

  • NKKTubes, a Tenaris company in which JFE Engineering Corp.

    has a 49% shareholding, has manufacturing facilities located in

    Kawasaki city, Japan, specialized in the production of high quality

    seamless tubes for oil and gas and industrial applications with an

    annual production capacity of 260,000 tons.

    Tenaris (TS: NYSE, Buenos Aires, Mexico and TEN: MTA Italy) is a

    leading global manufacturer and supplier of seamless steel pipe

    products and provider of pipe handling, stocking and distribution

    services to the oil and gas, energy and mechanical industries. It is

    also a leading regional supplier of welded steel pipes for gas

    pipelines in South America.

    TenarisNKKTubes has inherited the technology, know how and

    specialist expertise associated with the production, manufacture

    and development of drill pipe from NKK Corporation, which

    has produced high performance drill pipe and tool joints to

    outstanding quality standards since 1954.

  • Drill Pipe 3

    Upsetting of drill pipe Magnetic particle inspection(MPI)

    Heat treatment for the weldzone

    Drill pipes are manufacturedas part of an integratedprocess accomplished in fullyequipped state-of-the-artfacilities at TenarisNKKTubes.

    Drill pipes and tool joints are assembled by frictionwelding. After removal ofweld bead, each heat affectedzone is quench and temperedin a unique system to recovermechanical properties.Welded areas are inspected byUT and MPI.

    Quality and Manufacturing

    Investment in quality andtechnology is a permanentcommitment atTenarisNKKTubes, which holds ISO 9001, ISO14001, API Spec. 7 and API5D certifications.

    All employees are fullyinstructed in the importanceof quality and rigorousquality management systemsare applied in our operations.

    All products are manufacturedin accordance with customersspecifications and the mostdemanding internationalstandards.

    Long and smooth taper ofinternal upset

    Friction weld (Break-type)

  • 4 TenarisNKKTubes

    DRILL PIPE MECHANICAL PROPERTIES

    YIELD STRENGTH

    %

    ELONGATIONMIN

    HRC

    HARDNESSMAX

    ft-lbs (Joule)

    IMPACT VALUE*

    MAXMINSPEC. GRADE

    TENSILE STRENGTH

    MAXMIN

    API 5D

    NK

    series

    Group 1

    Group 3

    High

    Strength

    Sour

    Services

    E-75

    X-95

    G-105

    S-135

    S140

    V150

    C95S

    C105S

    75 (517)

    95 (655)

    105 (724)

    135 (931)

    140 (965)

    150 (1034)

    95 (655)

    105 (724)

    ksi (N/mm2) ksi (N/mm2) ksi (N/mm2) ksi (N/mm2)

    105 (724)

    125 (862)

    135 (931)

    165 (1138)

    165 (1138)

    165 (1138)

    110 (758)

    120 (827)

    100 (689)

    105 (724)

    115 (793)

    145 (1000)

    150 (1034)

    160 (1102)

    105 (724)

    115 (793)

    178 (1226)

    API formula

    API formula

    API formula

    API formula

    API formula

    API formula

    API formula

    API formula

    39

    40

    26

    29

    40 (54)

    40 (54)

    40 (54)

    40 (54)

    80 (108)

    80 (108)

    80 (108)

    80 (108)

    * Full size at room temperature

    DRILL PIPE AND TOOL JOINT CHEMICAL COMPOSITIONS

    C Mn P (Max) S (Max) Cr MoSPEC. GRADE Si (Max)

    API 5D

    (Pipe body)

    NK series

    (Pipe body)

    NK series

    (Tool joint)

    E, X, G, S

    S140

    V150

    C95S

    C105S

    TJ95

    TJ110

    Max.

    0.30

    0.25~0.30

    0.25~0.30

    0.25~0.40

    0.35

    0.35

    0.35

    0.35

    Max.

    1.00

    0.40~1.00

    0.40~1.00

    Max.

    1.20

    0.030

    0.020

    0.020

    0.020

    0.020

    0.030

    0.005

    0.005

    0.005

    0.010

    Max.

    1.20

    0.80~1.20

    0.80~1.20

    0.80~1.20

    0.40~0.80

    0.20~0.80

    0.40~0.80

    0.25~0.80

    DRILL PIPE SSCC RESISTANCE

    GRADE CRITERIA *

    C95S Pipe body

    C105S Pipe body

    80

    80

    * Method: NACE TM-01-77 Method A. Higher % SMYS can be supplied upon request.

    TOOL JOINT MECHANICAL PROPERTIES

    YIELD STRENGTH

    %

    % of SMYS

    ELONGATIONMIN

    HARDNESS

    ft-lbs (Joule)HB (HRC)

    IMPACT VALUE*

    MAXMINSPEC. GRADE

    TENSILE STRENGTH

    MIN

    API Spec. 7

    NK

    series

    High

    Strength

    Sour

    Services

    TJ130

    TJ95

    TJ110

    120 (827)

    130 (896)

    95 (655)

    110 (758)

    ksi (N/mm2) ksi (N/mm2) ksi (N/mm2)

    150 (1034)

    110 (758)

    125 (862)

    140 (965)

    150 (1034)

    105 (724)

    125 (862)

    13

    13

    13

    13

    Min 285

    Min 301

    (Max 26)

    (Max 30)

    40 (54)

    80 (108)

    80 (108)

    * Full size at room temperature

    Grades, specifications and availability

  • Drill Pipe 5

    WALLTHICKNESS

    C95SC105SS140V150

    API 5D NK SERIES * API NK DSTJTMSIZE NOMINAL

    WEIGHT UPSET

    DRILL PIPE TOOL JOINT

    2 3/8

    2 7/8

    3 1/2

    4***

    4 1/2

    5

    5 1/2

    6.65

    10.40

    9.50

    13.30

    15.50

    14.00

    13.75

    16.60

    20.00

    16.25

    19.50

    25.60

    21.90

    24.70

    0.280

    0.362

    0.254

    0.368

    0.449

    0.330

    0.271

    0.337

    0.430

    0.296

    0.362

    0.500

    0.361

    0.415

    inin lbs/ft

    Group 1E

    Group 3XGS

    EU

    IU

    EU

    IU

    EU

    IU

    EU

    IU

    EU

    IEU

    IU

    EU

    IU

    EU

    EU

    IEU

    EU

    IEU

    IU

    EU

    IEU

    EU

    IEU

    IEU

    IEU

    **

    **

    **

    **

    **

    **

    **

    **

    NC26

    NC31

    NC38

    NC38

    NC38

    NC40

    NC40

    NC46

    NC46

    NC50

    NC50

    NC46

    4 1/2 FH

    NC50

    NC46

    4 1/2 FH

    NC50

    5 1/2 FH

    NC50

    5 1/2 FH

    5 1/2 FH

    5 1/2 FH

    NK DSTJTM NC38

    NK DSTJTM NC38

    NK DSTJTM NC38

    NK DSTJTM NC40

    NK DSTJTM NC40

    NK DSTJTM NC46

    NK DSTJTM NC46

    NK DSTJTM NC50

    NK DSTJTM NC50

    NK DSTJTM NC46

    NK DSTJTM NC50

    NK DSTJTM NC46

    NK DSTJTM NC50

    NK DSTJTM 5 1/2 FH

    NK DSTJTM NC50

    NK DSTJTM 5 1/2 FH

    NK DSTJTM 5 1/2 FH

    NK DSTJTM 5 1/2 FH

    * Proprietary Drill Pipe of TenarisNKKTubes.** Available for tool joint specified by customer.

    *** 11.85 lbs/ft & 15.70 lbs/ft are available upon request.

    AVAILABLE SIZES AND GRADES

  • FEATURESInterchangeability with APItool joint.

    High torque resistance.

    Same running speed as API tool joint.

    Longer durability & lowerrepair ratio than API tooljoint.

    Bigger ID and/or smaller ODwhich translates intoimproved hydraulics and/orfish ability.

    Suitable for sour drilling(due to minimal hoop stressin box and lower tensilestress in pin).

    6 TenarisNKKTubes

    NK DSTJTM(DOUBLE SHOULDER TOOL JOINT)

    DESIGNDouble shoulderconnection (External & Internal).

    API Spec. 7 thread.

    Smooth bore. NK DSTJTM tooljoint pin ID is equal to thebox ID.

    InternalShoulder

    INTERCHANGEABILITY WITH API TOOL JOINT

    NK DSTJTM is interchangeablewith API tool joint. Any kind of accessories and drill pipewith API connections can bemade up with NK DSTJTM drillpipe.

    NK DSTJTM PIN

    API BOX

    API PIN

    NK DSTJTM BOX

    NK DSTJTM PIN

    API BOX

    API PIN

    NK DSTJTM BOX

  • Drill Pipe 7

    Pin: 6 5/8" OD x 2 3/4" IDBox: 31/2" IDCircumferential make-up: 40 Degrees 31,200 ft-lbs (42,300 N-m)

    HIGH TORQUE RESISTANCENK DSTJTM has excellenttorsional strengthcompared to API tool joint. NK DSTJTM is suitable fordeep well drilling, extended reach well or horizontal well drilling. Variousapplications, smaller OD and larger ID are available.

    Make-up TestDiagram on the right showstorque resistance testssupporting the performanceoffered by NK DSTJTM tooljoint. The results reflect ahigher performance of theNK DSTJTM NC50 over the API NC50. This figure shows

    the make-up torque curve of both tool joints (6 5/8 x 2 3/4). Difference, as seen,is remarkable. In the case NK DSTJTM NC50 would beattached to API S135 5 x19.5 ft-lbs drill pipe, pipebody would yield before the tool joint does.

    100

    80

    60

    40

    20

    0

    TOOL JOINT MAKE-UP TORQUE CURVE

    6 5/8 x 2 3/4 (PIN)NK DSTJTM

    6 5/8 x 2 3/4 (PIN)API NC50

    YIELD POINT 89.1

    YIELD POINT 52.9

    MAK

    E-U

    P TO

    RQU

    E (1

    000

    ft/lb

    s)

    * 63.4

    API Tool Joint Torsional Yield

    *74.1

    Pipe Body Torsional Yield

    *38.0

    API Tool Joint Recommended Make-up Torque

    (DEGREES)CIRCUMFERENTIAL MAKE-UP

    *API RP 7G (16th edition, 1998)

    40 20 60 80 100 120 140 160

    100 908070605040302010

    0-10-20-30-40-50-60-70-80-90

    -100

    Hoopstress

    VMEstress

    Axialstress

    STRESSkg/mm2

    Axialstress

    Hoopstress

    VMEstress

    Pin: 6 5/8" OD x 2 3/4" ID Box: 2 3/4" IDCircumferential make-up: 20 Degrees31,900 ft-lbs (43,300 N-m)

    API NC50 NK DSTJTM NC50

    FEM AnalysisIn the case of API NC50, very high VME stress andcompression stress are foundnear external shoulder area and it is supposed that shoulder deformation will start soon.

    NK DSTJTM NC50 clearlyindicates improvedperformance in comparisonto standard API tool joint.

  • Note Make-up torque is based on 70% of Torsional Yield Streng