Seamless Production Tubing for Oil, Gas and Injection Wells

Description

Goldenman manufactures Seamless API 5CT Tubing for oil production, gas production, water injection, gas lift, artificial lift, workover, geothermal and thermal-recovery wells.

The complete tubing range covers:

• Nominal outside diameters from 1.050 to 4-1/2 in
• J55, K55, N80, L80, C90, T95, C110, P110 and Q125 grades
• Carbon-steel, low-alloy-steel and chromium-steel materials
• Non-Upset End tubing
• External-Upset End tubing
• Integral-joint tubing
• Premium gas-tight connections
• Range 1, Range 2 and Range 3 lengths
• Standard, sour-service and CO₂-resistant configurations
• Plain-end, threaded-and-coupled and pup-joint supply
• Full-length seamless construction
• Normalized and quenched-and-tempered heat treatment
• Hydrostatic testing and full-body nondestructive examination
• Drift, thread-gauge and dimensional inspection
• Material, heat and individual-joint traceability

Each tubing string is configured according to the well depth, production rate, tubing size, nominal weight, wall thickness, steel grade, connection, internal pressure, external pressure, axial load, temperature and fluid chemistry.

Product Short Description

Goldenman Seamless Production Tubing provides the pressure-containing flow path between the downhole completion and the surface production system.

The tubing is manufactured from seamless steel pipe, heat treated to the specified API 5CT grade and finished with NUE, EUE, integral or premium threaded connections.

Standard sizes cover 1.050–4-1/2 inches, with J55 through Q125 materials for conventional production, high-pressure injection, sour gas, CO₂-bearing fluids, deep wells and high-temperature service.

Complete supply packages include tubing joints, couplings, pup joints, blast joints, flow couplings, landing nipples and connection accessories.

Product Highlights

• Manufactured to API Spec 5CT requirements
• Threading and gauging to API Spec 5B
• Seamless hot-finished construction
• Tubing sizes from 1.050 to 4-1/2 in
• Standard commercial sizes from 1.900 to 4-1/2 in
• Wall thicknesses from 3.18 to 16.00 mm
• API grades from J55 to Q125
• N80 Type 1 and N80 Type Q
• L80 Type 1, 3Cr, 9Cr and 13Cr
• C90, T95 and C110 sour-service grades
• P110 and Q125 high-strength tubing
• NUE Non-Upset End connections
• EUE External-Upset End connections
• Integral-joint and premium connections
• Range 1, Range 2 and Range 3 lengths
• Full-length controlled heat treatment
• Upset-end heat-treatment validation
• Precision-machined pin and coupling threads
• Phosphated and lubricated connections
• API drift inspection
• Hydrostatic pressure testing
• Full-body electromagnetic or ultrasonic inspection
• End-area magnetic-particle inspection
• Mechanical-property and hardness testing
• Complete heat and joint traceability
• EN 10204 3.1 documentation
• Export bundles with thread protectors

General Technical Specifications

Parameter	Available Range
Product	Seamless Oil Well Tubing
Product standard	API Spec 5CT
Thread standard	API Spec 5B
Manufacturing method	Seamless hot finished
Nominal outside diameter	1.050–4-1/2 in
Standard commercial range	1.900–4-1/2 in
Wall thickness	3.18–16.00 mm
Nominal weight	Approximately 1.14–38.84 kg/m
API grades	H40, J55, K55, N80, L80, R95, C90, T95, C110, C125, P110 and Q125
Chromium grades	L80 3Cr, L80 9Cr and L80 13Cr
End finishes	Plain End, NUE, EUE, Integral Joint and Premium Connection
Coupling types	Regular, Special Clearance and Premium
Standard lengths	Range 1, Range 2 and Range 3
Heat treatment	Normalized or quenched and tempered
Service	Sweet, sour, CO₂, injection, thermal and geothermal
Surface condition	Bare, varnished, internally coated or externally coated
Testing	Hydrostatic, drift, dimensional, mechanical and NDE
Packaging	Bundled with coupling and pin thread protectors
Documentation	MTR, NDE, hydrostatic, thread and dimensional reports

Tubing Size Range

Nominal Tubing Size	Outside Diameter
1.050 in	26.67 mm
1.315 in	33.40 mm
1.660 in	42.16 mm
1.900 in	48.26 mm
2-3/8 in	60.32 mm
2-7/8 in	73.02 mm
3-1/2 in	88.90 mm
4 in	101.60 mm
4-1/2 in	114.30 mm

Small-diameter tubing from 1.050 to 1.900 inches serves capillary, velocity-string, slim-hole and specialized completion applications.

Sizes from 2-3/8 to 4-1/2 inches form the principal production, injection and workover tubing range.

Main Tubing Dimensions

Tubing OD	NUE Nominal Weight	EUE Nominal Weight	Wall-Thickness Range
2-3/8 in / 60.32 mm	4.00–7.35 lb/ft	4.70–7.45 lb/ft	0.167–0.336 in / 4.24–8.53 mm
2-7/8 in / 73.02 mm	6.40–11.50 lb/ft	6.50–9.45 lb/ft	0.217–0.440 in / 5.51–11.18 mm
3-1/2 in / 88.90 mm	7.70–17.00 lb/ft	9.30–12.95 lb/ft	0.216–0.530 in / 5.49–13.46 mm
4 in / 101.60 mm	9.50–22.20 lb/ft	11.00 lb/ft standard configuration	0.226–0.610 in / 5.74–15.49 mm
4-1/2 in / 114.30 mm	12.60–26.10 lb/ft	12.75 lb/ft standard configuration	0.271–0.630 in / 6.88–16.00 mm

The final internal diameter and drift diameter follow the ordered OD, nominal weight, wall thickness and connection configuration.

Standard Length Ranges

Length Designation	Length Range
Range 1	20–24 ft / 6.10–7.32 m
Range 2	28–32 ft / 8.53–9.75 m
Range 3	38–42 ft / 11.58–12.80 m

Range 2 is the principal commercial length for production tubing.

Range 3 reduces the number of connections in deep wells and long tubing strings.

Pup Joints provide final string-length adjustment in lengths from 2 to 12 ft and in project-specific metric lengths.

Seamless Tubing Construction

Seamless tubing is manufactured from a solid round steel billet.

The manufacturing process includes:

1. Steel-billet inspection
2. Billet heating
3. Rotary piercing
4. Mandrel rolling or elongation
5. Sizing or stretch reduction
6. Controlled cooling
7. Full-length heat treatment
8. Straightening
9. End cutting
10. Upsetting where required
11. End machining
12. Thread cutting
13. Coupling installation
14. Hydrostatic testing
15. Full-body NDE
16. Drift inspection
17. Marking and packaging

The seamless body has no longitudinal weld seam, providing uniform circumferential properties and stable pressure performance.

NUE Tubing

NUE means Non-Upset End.

The tubing end maintains the same basic outside diameter as the pipe body before the pin thread is machined.

A NUE connection consists of:

• Non-upset tubing pin
• Internally threaded NUE coupling
• API round thread
• Pin and coupling bearing surfaces
• Thread compound
• Connection protectors

NUE Tubing provides:

• Smaller coupling outside diameter
• Increased annular clearance
• Reduced connection weight
• Easier passage through restricted casing
• Compatibility with slim-hole completions
• Efficient standard production service

NUE configurations are used in:

• Conventional oil wells
• Low- and medium-pressure gas wells
• Water-injection wells
• Slim-clearance completions
• Workover strings
• Velocity strings
• Artificial-lift wells

EUE Tubing

EUE means External-Upset End.

The tubing end is forged to a larger outside diameter and increased wall section before threading.

The upset section provides:

• Increased connection cross-sectional area
• Larger pin shoulder
• Increased thread engagement
• Improved tensile efficiency
• Increased connection fatigue resistance
• Greater resistance to repeated handling
• Higher connection capacity

EUE Tubing is used in:

• Deep production wells
• High-tension tubing strings
• High-pressure injection wells
• Gas wells
• Artificial-lift completions
• Workover operations
• Tubing strings subjected to repeated pulling and running

NUE vs EUE Tubing

Selection Factor	NUE Tubing	EUE Tubing
Pipe end	Non-upset	External upset
Coupling OD	Smaller	Larger
Annular clearance	Greater	Lower
Connection area	Standard	Increased
Tensile efficiency	Standard	Higher
Connection length	Shorter	Longer
Weight	Lower	Higher
Typical use	Conventional and restricted-clearance wells	Deep and high-load wells
Interchangeability	NUE components only	EUE components only

NUE and EUE pins and couplings use different dimensions and are not interchangeable.

Integral-Joint Tubing

Integral-Joint Tubing uses a pin and box connection machined directly into the tubing ends without a separate external coupling.

It provides:

• Reduced external connection diameter
• Increased annular clearance
• Smooth external profile
• Reduced risk of coupling contact
• Compatibility with slim-hole completions
• Improved passage through restrictions

Integral tubing is used in:

• Slim wells
• Coiled-tubing support strings
• Completion strings with restricted clearance
• Velocity strings
• Liner and tail-pipe assemblies
• Artificial-lift systems

Premium-Connection Tubing

Premium connections provide enhanced sealing and structural performance beyond standard API round-thread connections.

Available configurations include:

• Metal-to-metal gas seal
• Torque shoulder
• High-tension connection
• Compression-resistant connection
• High-bending-capacity connection
• Flush or semi-flush OD
• High-torque PCP connection

Premium Tubing is used in:

• High-pressure gas wells
• HPHT wells
• Sour-gas completions
• Horizontal wells
• Highly deviated wells
• Thermal-recovery wells
• Gas-storage wells
• Carbon-injection wells
• Geothermal wells
• Wells requiring high connection leak resistance

Premium connections are manufactured from approved connection drawings, gauges and performance requirements.

API Tubing Grades

J55 Tubing

J55 is used for:

• Shallow and medium-depth oil wells
• Conventional production
• Moderate internal pressure
• Moderate axial load
• Non-corrosive fluids
• Cost-sensitive completion programs

J55 provides good weldability, formability and general mechanical performance.

K55 Tubing

K55 shares the J55 minimum yield-strength level while providing increased minimum tensile strength.

It is used for:

• Conventional oil and gas production
• Medium-depth wells
• Increased tensile requirements
• Production and injection strings
• General non-sour service

N80 Tubing

N80 is supplied as:

• N80 Type 1
• N80 Type Q

N80 Type Q uses quenched-and-tempered heat treatment for controlled strength and toughness.

N80 is used in:

• Medium- and deep-production wells
• Higher-pressure completions
• Water injection
• Gas lift
• High-load artificial-lift strings
• Workover service

L80 Type 1 Tubing

L80 Type 1 uses controlled strength and hardness.

It is used in:

• Sour-service wells
• Corrosion-controlled production
• H₂S-containing environments
• Injection wells
• Gas wells
• Workover strings

The material package includes controlled heat treatment, hardness testing and full traceability.

L80 3Cr Tubing

L80 3Cr provides increased resistance to CO₂ corrosion compared with conventional low-alloy tubing.

It is used in:

• Wet CO₂ production
• Produced-water service
• Gas wells
• Oil wells with controlled chloride exposure
• Injection systems

L80 9Cr Tubing

L80 9Cr provides increased chromium content for more aggressive CO₂ environments and elevated operating temperatures.

It is used in:

• High-CO₂ gas wells
• High-temperature production
• Geothermal systems
• Corrosive injection service

L80 13Cr Tubing

L80 13Cr provides strong resistance to sweet CO₂ corrosion.

It is used in:

• CO₂-bearing oil and gas wells
• Offshore production
• High-water-cut wells
• Geothermal production
• Corrosive completion fluids
• Wells requiring reduced corrosion-inhibitor consumption

13Cr material requires controlled handling, thread compound and completion-fluid chemistry.

C90 Tubing

C90 provides controlled strength and hardness for sour-service wells.

It is used in:

• H₂S-containing production
• Deep sour-gas wells
• High-tension tubing strings
• High-pressure sour injection
• Completion systems requiring controlled SSC resistance

T95 Tubing

T95 provides increased yield strength while maintaining controlled hardness for sour service.

It is used in:

• Deep sour wells
• High-pressure gas production
• High axial load
• Sour injection wells
• Demanding completion strings

C110 Tubing

C110 combines high strength with controlled sour-service properties.

It is used in:

• Deep high-pressure sour wells
• High suspended tubing loads
• HPHT sour completions
• Gas production
• High-pressure injection

P110 Tubing

P110 is a high-strength tubing grade for:

• Deep wells
• High internal pressure
• High suspended loads
• Hydraulic-fracturing completions
• High-pressure injection
• Long tubing strings
• High-production-rate wells

P110 uses quenched-and-tempered alloy steel with controlled mechanical properties.

Q125 Tubing

Q125 provides high yield strength for severe load and pressure conditions.

It is used in:

• Ultra-deep wells
• HPHT completions
• High-pressure injection
• Heavy tubing strings
• High axial-load conditions
• Specialized deep gas wells

Common Mechanical Properties

Grade	Minimum Yield Strength	Maximum Yield Strength	Minimum Tensile Strength
J55	379 MPa / 55 ksi	552 MPa / 80 ksi	517 MPa / 75 ksi
K55	379 MPa / 55 ksi	552 MPa / 80 ksi	655 MPa / 95 ksi
N80	552 MPa / 80 ksi	758 MPa / 110 ksi	689 MPa / 100 ksi
L80	552 MPa / 80 ksi	655 MPa / 95 ksi	655 MPa / 95 ksi
P110	758 MPa / 110 ksi	965 MPa / 140 ksi	862 MPa / 125 ksi
Q125	862 MPa / 125 ksi	1,034 MPa / 150 ksi	931 MPa / 135 ksi

The final grade specification includes chemical composition, heat treatment, hardness, impact performance, SSC requirements and supplementary testing.

Tubing Grade Selection

Well Condition	Tubing Grade
Shallow conventional oil well	J55
Moderate-depth production	J55 or K55
Medium- to high-load production	N80Q
Controlled sour service	L80 Type 1
CO₂ corrosion	L80 3Cr, 9Cr or 13Cr
High-strength non-sour service	P110
Sour service with increased load	C90 or T95
Deep high-strength sour service	C110
Ultra-high axial and pressure load	Q125

Grade selection includes:

• Well depth
• Tubing weight
• Internal pressure
• External pressure
• Axial tension
• Compression
• Bending
• Operating temperature
• H₂S concentration
• CO₂ concentration
• Chloride concentration
• Produced-water chemistry
• Corrosion-inhibitor program
• Connection type
• Expected service life

Production-Tubing Applications

Goldenman tubing is used in:

• Oil production
• Gas production
• Condensate production
• Artificial lift
• Rod-pump wells
• Electric-submersible-pump wells
• Progressive-cavity-pump wells
• Gas lift
• Plunger lift
• Water injection
• Gas injection
• CO₂ injection
• Steam injection
• Geothermal production
• Workover strings
• Well testing
• Temporary completion strings

Oil Production Tubing

Oil-production tubing carries crude oil, produced water and associated gas from the downhole completion to the wellhead.

The tubing string supports:

• Internal production pressure
• String tension
• Pump and completion loads
• Temperature cycles
• Rod and coupling wear
• Corrosion
• Scale and paraffin deposition

The configuration balances flow area, pressure capacity, connection strength and artificial-lift equipment clearance.

Gas Production Tubing

Gas wells require control of:

• Internal gas pressure
• Connection leak resistance
• Axial load
• Temperature
• H₂S
• CO₂
• Condensate and water
• Rapid decompression
• Erosion

Premium metal-to-metal connections are used where standard API round-thread connections do not provide the specified gas-sealing performance.

Injection Tubing

Injection tubing carries:

• Water
• Polymer
• Gas
• CO₂
• Steam
• Chemicals
• Disposal fluids

Injection strings require verified:

• Burst resistance
• Connection sealability
• Corrosion resistance
• Temperature resistance
• Axial capacity
• Internal coating compatibility

Artificial-Lift Tubing

Artificial-lift tubing supports:

• Sucker rods
• Rod couplings
• ESP power cables
• Gas-lift mandrels
• PCP rod strings
• Pump seating nipples
• Downhole anchors
• Tubing rotators

The tubing ID, drift and connection OD are matched to the artificial-lift equipment.

Sour-Service Tubing

Sour-service tubing is manufactured for H₂S-containing fluids.

The material package includes:

• Controlled chemical composition
• Controlled hardness
• Quenched-and-tempered heat treatment
• SSC-resistant grade selection
• Full-length NDE
• End-area inspection
• Hardness testing
• Heat and joint traceability
• Sour-service coupling material
• H₂S-compatible connection coating

Applicable grades include L80 Type 1, C90, T95 and C110.

CO₂-Resistant Tubing

CO₂-resistant tubing uses chromium-bearing materials to reduce sweet-corrosion rates.

The range includes:

• L80 3Cr
• L80 9Cr
• L80 13Cr
• Project-specific super-13Cr
• Corrosion-resistant alloy tubing

Material selection considers:

• CO₂ partial pressure
• Water cut
• Chloride content
• Temperature
• Flow velocity
• Organic acids
• H₂S content
• Scale-forming tendency

Internal Coatings

Tubing internal coatings provide protection against:

• CO₂ corrosion
• Produced-water corrosion
• Scale adhesion
• Paraffin accumulation
• Injection-fluid corrosion
• Friction pressure loss

Available systems include:

• Epoxy
• Modified epoxy
• Phenolic
• Novolac
• Polyamide
• Project-specific high-temperature coatings

The internal coating is applied after surface preparation and verified through thickness, adhesion, cure and holiday testing.

Tubing Accessories

Goldenman supplies:

• Tubing Couplings
• Tubing Pup Joints
• Blast Joints
• Flow Couplings
• Landing Nipples
• Seating Nipples
• Perforated Pup Joints
• Crossover Subs
• Tubing Swages
• Thread Protectors
• Premium-Connection Accessories
• Special-Clearance Couplings

Tubing Pup Joints

Pup Joints adjust the final tubing-string length.

Standard lengths include:

• 2 ft
• 3 ft
• 4 ft
• 6 ft
• 8 ft
• 10 ft
• 12 ft

Pup Joints use the same OD, wall thickness, grade and connection as the main tubing string.

Blast Joints

Blast Joints use increased wall thickness or wear-resistant material opposite producing perforations.

They protect the tubing string from:

• High-velocity fluid
• Sand erosion
• Perforation inflow
• Turbulence
• Localized wall loss

Flow Couplings

Flow Couplings provide increased wall thickness above and below completion components where turbulence and velocity create localized erosion.

They are installed near:

• Landing nipples
• Safety valves
• Chokes
• Sliding sleeves
• Gas-lift equipment
• Flow-control devices

Tubing Connection Manufacturing

The connection-manufacturing process includes:

1. End-length inspection
2. End upsetting for EUE tubing
3. Upset heat treatment
4. Upset dimensional inspection
5. Pin-thread machining
6. Coupling-thread machining
7. Thread-profile inspection
8. Taper and lead measurement
9. API plug and ring gauging
10. Bearing-face inspection
11. Phosphating
12. Thread-compound application
13. Coupling makeup
14. Thread-protector installation

Thread Inspection

Thread inspection covers:

• Thread form
• Taper
• Lead
• Pitch diameter
• Thread height
• Crest and root condition
• Thread length
• Vanish point
• Pin shoulder
• Coupling bearing face
• Connection concentricity
• Surface finish

Calibrated working gauges and reference standards verify the finished connection.

Hydrostatic Testing

Each pressure-service tubing joint undergoes hydrostatic testing.

The test controls:

• Test pressure
• Pressure-hold time
• Gauge calibration
• External leakage
• Permanent deformation
• Individual pipe identification
• Electronic test record

The hydrostatic pressure follows the tubing size, wall thickness, grade and ordered product requirements.

Nondestructive Examination

Available NDE includes:

• Ultrasonic testing
• Electromagnetic inspection
• Eddy-current inspection
• Magnetic-flux-leakage inspection
• Magnetic-particle inspection
• End-area inspection
• Wall-thickness inspection
• Surface-defect inspection

Full-body inspection detects longitudinal and transverse imperfections, laminations and wall-thickness variation.

Drift Testing

Drift testing verifies that the minimum required internal diameter remains clear through the full tubing length.

It confirms passage for:

• Downhole pumps
• Plugs
• Gauges
• Wireline tools
• Coiled-tubing equipment
• Artificial-lift components
• Completion tools

The drift size is selected from the tubing OD, wall thickness and connection configuration.

Quality Control

Goldenman quality control includes:

• Billet-material verification
• Heat-number traceability
• Chemical-composition testing
• Heat-treatment monitoring
• Yield-strength testing
• Tensile-strength testing
• Elongation testing
• Impact testing
• Hardness testing
• OD inspection
• Wall-thickness inspection
• Ovality inspection
• Straightness inspection
• Upset-dimension inspection
• Thread-gauge inspection
• Coupling inspection
• Full-body NDE
• End-area NDE
• Hydrostatic testing
• Drift testing
• Coating inspection
• Marking verification
• Final visual inspection

Common Tubing Failure Modes

Connection Leakage

Connection leakage results from:

• Incorrect connection selection
• Thread damage
• Insufficient makeup
• Excessive makeup
• Incorrect thread compound
• Galling
• Bending load
• Gas pressure cycling

Tubing Corrosion

Corrosion results from:

• H₂S
• CO₂
• Oxygen
• Chlorides
• Produced water
• Organic acids
• High temperature
• Insufficient corrosion inhibition

Burst Failure

Burst failure results from internal pressure exceeding the tubing-body or connection capacity.

Collapse Failure

Collapse results from external pressure exceeding internal pressure and tubing collapse resistance.

Tensile Failure

Tensile failure results from:

• Excessive suspended string weight
• Thermal load
• Pressure-induced axial force
• Stuck tubing
• Overpull during workover
• Reduced wall thickness

Erosion

Erosion results from:

• Sand production
• High flow velocity
• Turbulence
• Local restrictions
• Gas-liquid multiphase flow

Rod and Coupling Wear

Artificial-lift systems create tubing wear through contact with Sucker Rods and Rod Couplings, especially in deviated wells.

Rod Guides, tubing rotators and wear-resistant internal coatings reduce contact damage.

Installation and Makeup

Installation procedure:

1. Verify tubing size, weight, grade and connection.
2. Check the tubing tally and running sequence.
3. Inspect the pipe body and connections.
4. Remove both thread protectors.
5. Clean the pin and coupling threads.
6. Apply the approved thread compound.
7. Align the joint vertically.
8. Start the connection without cross-threading.
9. Use calibrated tubing power tongs.
10. Apply the specified makeup torque or position.
11. Record connection makeup.
12. Install tubing accessories according to the completion program.
13. Complete tubing drift and pressure testing.
14. Land the tubing string at the specified wellhead position.

Handling and Storage

Tubing is handled with equipment that prevents:

• Pipe-body dents
• Thread impact
• Coupling damage
• Coating damage
• Excessive bending
• Dragging
• Contact with corrosive materials

Storage requirements include:

• Level pipe racks
• Multiple support points
• Installed thread protectors
• Separation by size and grade
• Clear heat and joint identification
• Protection from standing water
• Controlled bundle lifting
• Indoor or covered storage for chromium tubing

Product Marking

Each joint is marked with:

• Goldenman identification
• Product standard
• Tubing size
• Nominal weight
• Steel grade
• Connection type
• Length range
• Heat number
• Joint number
• Manufacturing process
• Heat-treatment condition
• Hydrostatic-test identification
• Sour-service or chromium-grade designation
• Manufacturing date

Product Documentation

The documentation package includes:

• Certificate of Conformity
• Product datasheet
• Material Test Certificate
• EN 10204 3.1 certificate
• Chemical-composition report
• Heat-treatment record
• Mechanical-property report
• Impact-test report
• Hardness report
• Full-body NDE report
• End-area NDE report
• Hydrostatic-test report
• Drift inspection report
• Dimensional inspection report
• Thread-gauge inspection report
• Coupling inspection report
• Coating inspection report
• Heat and joint traceability list
• Tubing tally
• Packing list
• Third-party inspection report

Frequently Asked Questions

What is API 5CT Tubing?

API 5CT Tubing is steel pipe installed inside the casing string to transport oil, gas, water, steam or injection fluids between the formation and surface equipment.

What tubing sizes are available?

Goldenman supplies tubing from 1.050 to 4-1/2 inches.

The main commercial range includes:

• 1.900 in
• 2-3/8 in
• 2-7/8 in
• 3-1/2 in
• 4 in
• 4-1/2 in

Is this page for casing pipe?

No.

This page covers production, injection and workover tubing. Casing pipe is supplied under Goldenman’s separate API 5CT Casing page.

What is the difference between tubing and casing?

Tubing carries produced or injected fluid inside the well.

Casing supports the wellbore, isolates formations and protects the completion.

What is the difference between NUE and EUE?

NUE uses non-upset pipe ends and a smaller coupling OD.

EUE uses externally upset ends for increased connection area and tensile capacity.

Which connection has greater annular clearance?

NUE and integral-joint connections provide greater clearance than conventional EUE tubing.

Which grade is used for conventional production?

J55, K55 and N80 are used in conventional sweet-service production wells.

Which grade is used for sour service?

L80 Type 1, C90, T95 and C110 are used in H₂S-containing environments.

Which grade is used for CO₂ service?

L80 3Cr, 9Cr and 13Cr provide increased resistance to CO₂ corrosion.

Which grade is used for high-pressure wells?

P110 and Q125 provide increased yield strength for deep and high-pressure completions.

What is the most common tubing length?

Range 2, covering 28–32 ft, is the principal commercial production-tubing length.

Are Range 3 joints available?

Yes.

Range 3 joints cover 38–42 ft and reduce the number of connections in long tubing strings.

Are Pup Joints available?

Yes.

Goldenman supplies Tubing Pup Joints in standard 2–12 ft lengths and custom metric lengths.

Are premium connections available?

Yes.

Goldenman manufactures premium gas-tight, high-tension, compression-resistant and high-torque tubing connections.

Is internal coating available?

Yes.

Epoxy, phenolic and high-temperature internal coating systems are supplied for corrosion, scale and paraffin control.

How is the tubing tested?

Testing includes mechanical-property testing, hardness inspection, full-body NDE, end-area inspection, hydrostatic testing, drift testing, dimensional inspection and thread gauging.

Information Required for Quotation

Please provide:

• Tubing outside diameter
• Nominal weight
• Wall thickness
• Steel grade
• NUE, EUE, Integral Joint or Premium Connection
• Connection drawing for premium threads
• Range 1, Range 2 or Range 3
• Required joint quantity
• Pup Joint requirements
• Coupling type
• Regular or Special Clearance Coupling
• Production, injection or workover application
• Well depth
• Tubing setting depth
• Maximum internal pressure
• Maximum external pressure
• Maximum axial load
• Operating temperature
• H₂S concentration
• CO₂ concentration
• Chloride concentration
• Produced-water chemistry
• Corrosion-inhibitor program
• Internal coating
• Sour-service requirements
• Hydrostatic-test requirements
• NDE requirements
• Drift requirements
• Third-party inspection
• Documentation requirements
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies Seamless API 5CT Tubing for oil production, gas production, injection, gas lift, artificial lift, workover, geothermal and thermal-recovery wells.

The complete range covers:

• Tubing sizes from 1.050 to 4-1/2 in
• Wall thicknesses up to 16.00 mm
• J55 through Q125 steel grades
• L80 3Cr, 9Cr and 13Cr tubing
• NUE and EUE API connections
• Integral and premium gas-tight connections
• Range 1, Range 2 and Range 3 lengths
• Tubing Couplings, Pup Joints, Blast Joints and Flow Couplings
• Standard, sour-service and CO₂-resistant configurations

Complete orders are supplied with material traceability, mechanical-property reports, full-body NDE, hydrostatic testing, drift inspection, thread-gauge inspection and export packaging.

Email: info@goldenman.com