Review API connection Vs Premium

By Hendra Wisanggeni

OCTG Connections new nomenclature

ISO 11960:2004/API Std. 5B Propritary connections connections

Tubing EU Tubing MTCNU IJIJ

MIJCasing STC Casing MTC

LC SLHPBC IFJXC

MIJ

Casing & Tubing connections classification

API spec 5BAPI spec 5B

PremiuPremiumm

Tenaris Tenaris FamilyFamily

Hunting IntlHunting Intl

• Round threadRound thread• Buttress threadButtress thread• Extreme line Extreme line

• Tenaris Blue Tenaris Blue familyfamily• Antares family Antares family • NKK familyNKK family• SECSEC• Atlas Bradford Atlas Bradford • BossBoss • HHSLASLA•Multiseal/two Multiseal/two stepstep

VAM Family

Round thread

Buttress thread

Extreme Line

External Upset End

API Connections

API 8Round Short Thread J values

OD ppf Short threadJ values

4 ½” 9.50 1.125”5” 11.50 0.750”7” 17.00 1.250”8 5/8” 24.00 0.875”10 ¾” 32.75 1.250”Other labels 0.500”

Short round threadJ value

Round thread API standard 5B

Tubing: EU (1.050” - 4 1/2”) NU (1.050” - 4 1/2”) IJ (1.315” - 2.063”)

Casing: STC (4 1/2” - 20”) LC (4 1/2” - 20”)

Triangle stamp for OD 16” to 20”

API Round thread

30°Fx

Fn

Ft

Small helical voids between thread crests and roots

API 8 Round jump-out failure mechanism

• Frequent during casing over-pull • Final pin ID lower than original ID• Pin crests deformation• Box crests deformation

API Round threadAdvantages/Kelebihan:

- Easy to manufacture (mudah diproduksi)- Easy running (mudah dipasang)- Acceptable sealability response at low pressure (mampu sekat/seal untuk tekanan rendah)- Well known (sudah dikenal)

Disadvantages/Kelemahan:- Poor tension resistance (ketahanan thd beban tarik lemah)- Poor sealability for medium and high pressure (mampuan sekat/seal untuk tekanan tinggi dan tingi lemah)

Premium Connections - Features

PINPINBOXBOX

Torque Shoulder

Metal to Metal Seal

Thread Form

Area kritis

FLUID FLOW

FLUID FLOW

API

Premium

• gangguan aliran yang menyebabkan turbulence

Turbulence

streamline

Typical Premium ConnectionT&C

• Premium thread form• Tension/Tarik• Compression/Tekan• Bending/Tekuk

• Improved seal performance• Metal-to-metal seals• Teflon seals• Multiple seals

• Torque shoulders• Torsional strength• Positive makeup position• Stored torque prevents back-off• Repeated make-up without performance

degradation– Possible to repair as many as possible, no need

total reprocess

Premium connections advantages

Premium connections advantages

• Relatively more expenses in term of unit price

• Need good support such as running assistance and work shop for repair