API-Certified Drill Pipe for Oil and Gas Drilling Rigs

Описание

Goldenman API 5DP Drill Pipe is designed for transmitting rotary torque, axial load and drilling fluid between the surface drilling equipment and bottom-hole assembly.

Available configurations cover nominal sizes from 2-3/8 to 6-5/8 inches, with E75, X95, G105 and S135 steel grades, EU or IEU upset options and multiple rotary-shouldered tool joint connections.

Connection options shown in the existing product range include NC26, NC31, NC38, NC40, NC46, NC50, 5-1/2 FH and 6-5/8 FH. Tool joint outside diameter, inside diameter and torsional strength are matched to the pipe size, nominal weight and steel grade.

Goldenman supplies drill pipe with API certification, material traceability, dimensional inspection and project-specific quality documentation.

Product Highlights

• Manufactured in accordance with API Spec 5DP
• Nominal sizes from 2-3/8 to 6-5/8 inches
• E75, X95, G105 and S135 steel grades
• EU and IEU upset configurations
• NC26 through NC50 connection options
• 5-1/2 FH and 6-5/8 FH connections available
• Grade-matched weld-on tool joints
• Tool joint OD and ID selected for torque and hydraulic requirements
• Material and heat-number traceability
• Dimensional and thread inspection
• Nondestructive examination according to the agreed inspection scope
• Optional hardbanding and internal coating
• Replacement drill pipe matching support
• API certificate and inspection documents available

What Is API 5DP Drill Pipe?

Drill pipe is a tubular drillstring component consisting of a steel pipe body and weld-on tool joints.

Connected lengths of drill pipe form the main section of the drillstring and perform three critical functions:

• Transmit rotary torque to the bottom-hole assembly
• Carry axial and tensile loads during drilling and tripping
• Provide an internal flow path for drilling fluid

API Spec 5DP covers drill pipe bodies, tool joints and complete drill pipe assemblies. The API Monogram licensing scope separately identifies these three product categories.

Drill pipe selection must consider more than nominal outside diameter. Steel grade, wall thickness, upset type, connection, tool joint geometry and torsion ratio must be evaluated together.

Main Applications

Goldenman API 5DP Drill Pipe can be configured for:

• Onshore oil and gas drilling
• Conventional vertical drilling
• Directional drilling
• Workover and well-servicing operations
• Geothermal drilling
• Water-well and deep-hole drilling
• Mineral exploration drilling
• Replacement of worn drillstring components
• New drilling-rig packages
• Drillstring upgrades requiring higher-strength grades

The final size, grade and connection should be selected according to well depth, hole trajectory, expected tension, drilling torque, hydraulic requirements and existing drillstring compatibility.

General Technical Specifications

Parameter	Available Specification
Product name	API Drill Pipe
Applicable standard	API Spec 5DP
Product construction	Drill pipe body with weld-on tool joints
Nominal OD range	2-3/8–6-5/8 in
Available grades	E75, X95, G105, S135
Upset types	EU and IEU, depending on configuration
Connection options	NC26, NC31, NC38, NC40, NC46, NC50, 5-1/2 FH, 6-5/8 FH
Pipe body OD range	60.32–168.30 mm
Wall thickness range shown	7.11–12.70 mm
Tool joint OD range shown	85.70–215.90 mm
Tool joint pin ID range shown	41.28–127.00 mm
Tool joint bevel diameter range	82.95–195.70 mm
Pin tong length range	177.80–203.20 mm
Box tong length range	203.20–279.40 mm
Upset neck OD range	65.09–176.21 mm
Listed torsion ratio range	0.79–1.53
Certification	API certificate
Optional configuration	Hardbanding, internal coating and custom marking

The listed ranges combine several pipe sizes, weights, grades and connection configurations. Final tool joint dimensions and torsion ratio must be confirmed against the selected drill pipe configuration.

Available Drill Pipe Sizes

Nominal Size	Nominal Weight	Pipe Body OD	Wall Thickness	Available Grades	Upset Type	Connection Options Shown
2-3/8 in	6.65 lb/ft	60.32 mm	7.11 mm	E75, X95, G105	EU	NC26
2-7/8 in	10.4 lb/ft	73.02 mm	9.19 mm	E75, X95, G105, S135	EU	NC31
3-1/2 in	13.3 lb/ft	88.90 mm	9.35 mm	E75, X95, G105, S135	EU	NC38
3-1/2 in	15.5 lb/ft	88.90 mm	11.40 mm	E75, X95, G105, S135	EU	NC38 / NC40
4 in	14 lb/ft	101.60 mm	8.38 mm	E75, X95, G105, S135	According to the configuration	NC40 / NC46
4-1/2 in	16.6 lb/ft	114.30 mm	8.56 mm	E75, X95, G105, S135	IEU / EU	NC46 / NC50
4-1/2 in	20 lb/ft	114.30 mm	10.92 mm	E75, X95, G105, S135	IEU / EU	NC46 / NC50
5 in	19.5 lb/ft	127.00 mm	9.19 mm	E75, X95, G105, S135	IEU	NC50 / 5-1/2 FH
5 in	25.6 lb/ft	127.00 mm	12.70 mm	E75, X95, G105, S135	IEU	NC50 / 5-1/2 FH
5-1/2 in	21.9 lb/ft	139.70 mm	9.17 mm	E75, X95, G105, S135	According to the configuration	5-1/2 FH
5-1/2 in	24.7 lb/ft	139.70 mm	10.54 mm	E75, X95, G105, S135	According to the configuration	5-1/2 FH
6-5/8 in	25.2 lb/ft	168.30 mm	8.38 mm	E75, X95, G105, S135	According to the configuration	6-5/8 FH
6-5/8 in	27.7 lb/ft	168.30 mm	9.19 mm	E75, X95, G105, S135	According to the configuration	6-5/8 FH

Tool joint OD, pin ID, bevel diameter and torsion ratio vary by steel grade and connection. The final dimensional table should be included in the approved order datasheet.

Drill Pipe Grade Selection

E75 Drill Pipe

E75 is generally selected for drilling programs with moderate tensile and torsional requirements.

It may be suitable where:

• Well depth is moderate
• Drillstring loads are comparatively lower
• High-strength grades are not required
• Lower equipment weight and cost are important
• The drilling program permits a wider strength margin at the connection

The final selection should still be verified through drillstring load analysis.

X95 Drill Pipe

X95 provides a higher-strength option than E75 and may be selected when additional tensile capacity is required without moving directly to G105 or S135.

Typical selection factors include:

• Increased drilling depth
• Higher suspended drillstring weight
• Directional-well loading
• Greater torque requirements
• Compatibility with existing X95 drillstring components

G105 Drill Pipe

G105 is commonly considered for deeper and more demanding drilling programs requiring higher tensile and torsional capacity.

The buyer should confirm:

• Maximum hook load
• Expected drilling torque
• Dogleg severity
• Fatigue exposure
• Tool joint torsional strength
• Remaining wall thickness criteria

S135 Drill Pipe

S135 is a high-strength drill pipe grade intended for applications requiring greater pipe-body strength.

However, selecting S135 does not automatically increase the capacity of the complete drillstring. The tool joint, connection and torsion ratio must also be checked.

A high-strength pipe body combined with an undersized tool joint can make the tool joint the limiting component.

How to Select the Correct Drill Pipe

1. Confirm Pipe Size and Nominal Weight

Nominal OD and wall thickness affect:

• Internal flow area
• Tensile capacity
• Torsional capacity
• Drillstring weight
• Annular clearance
• Fishing and handling requirements

A heavier nominal weight normally provides a thicker pipe wall but reduces internal flow area.

2. Select the Appropriate Steel Grade

Do not select the highest grade automatically.

The grade should be based on:

• Well depth
• Maximum tension
• Expected drilling torque
• Hole trajectory
• Dogleg severity
• Fatigue loading
• Existing drillstring grade
• Inspection and retirement criteria

Using mixed grades in one drillstring requires clear identification and an approved operating plan.

3. Confirm Upset Type

The upset configuration affects the transition between the pipe body and tool joint.

The page-listed configurations include EU and IEU options. The correct upset must match:

• Pipe body size and weight
• Tool joint configuration
• Weld-end geometry
• Required internal diameter
• Existing replacement dimensions

EU and IEU drill pipe should not be treated as interchangeable without dimensional verification.

4. Select the Tool Joint Connection

Connection selection should consider:

• Existing drillstring connection
• Required torsional capacity
• Tool joint OD
• Pin and box ID
• Bevel diameter
• Make-up torque
• Casing and wellbore clearance
• Hydraulic pressure loss
• Fishing-tool compatibility

Changing from one connection to another may affect the complete drillstring and handling-equipment setup.

5. Review the Torsion Ratio

The torsion ratio compares the torsional capacity of the tool joint with that of the drill pipe body.

When the ratio is below 1.0, the tool joint may reach its torsional limit before the pipe body. When the ratio is above 1.0, the pipe body may become the limiting component.

The ratio should be reviewed together with expected drilling torque, connection condition, make-up torque and remaining wall thickness.

Tool Joint and Connection Matching

The tool joint should not be selected only by connection name.

For example, two NC50 drill pipes may have different:

• Tool joint outside diameters
• Pin inside diameters
• Bevel diameters
• Tong-space lengths
• Upset neck dimensions
• Torsion ratios

These differences affect:

• Torque capacity
• Hydraulic performance
• External wear allowance
• Casing clearance
• Handling-tool compatibility
• Interchangeability with existing drill pipe

For replacement orders, Goldenman recommends confirming the complete pipe and tool joint dimensions rather than relying only on “NC50” or “S135” descriptions.

Optional Hardbanding and Internal Coating

Hardbanding may be applied to tool joint wear areas when required by the drilling program.

The buyer should specify:

• Required hardbanding type
• Casing-friendly requirement
• Application position
• Width and thickness
• New or refurbished tool joint
• End-user approval requirements

Internal coating may be specified to reduce internal corrosion or hydraulic friction under suitable operating conditions.

Coating selection should consider:

• Drilling-fluid chemistry
• Operating temperature
• Solids content
• Handling and inspection procedures
• Repair requirements
• Compatibility with the intended service

Both hardbanding and internal coating should be clearly identified in the purchase order.

Quality Control and API Documentation

Goldenman supplies drill pipe with API certification and traceable production documentation.

The agreed inspection scope may include:

• Raw-material certificate review
• Heat-number traceability
• Chemical composition verification
• Mechanical property testing
• Pipe body dimensional inspection
• Wall-thickness inspection
• Tool joint dimensional inspection
• Weld-zone inspection
• Hardness verification
• Nondestructive examination
• Internal drift inspection
• Rotary-shouldered thread gauging
• Shoulder and sealing-face inspection
• Straightness inspection
• Product marking verification
• Hardbanding inspection when applicable
• Internal coating inspection when applicable
• Final documentation review

The API certificate, inspection level, and third-party witness requirements should be confirmed before production.

Common Drill Pipe Procurement Mistakes

Selecting Only by OD and Grade

A description such as “5-inch S135 drill pipe” is incomplete. Nominal weight, upset, connection, tool joint OD, pin ID and length must also be confirmed.

Assuming All NC Connections Are Identical

Connection designation alone does not define the complete tool joint geometry.

Ignoring Torsion Ratio

A higher pipe grade may not improve usable drilling torque when the tool joint remains the limiting component.

Mixing Drill Pipe Without Dimensional Verification

Drill pipe from different suppliers or production batches should not be assumed interchangeable, only because the nominal size and connection are the same.

Confusing S135 with Sour Service

S135 identifies a high-strength drill pipe grade. It does not mean that the product is automatically suitable for H₂S service.

Frequently Asked Questions

How should buyers choose between E75, X95, G105 and S135 drill pipe?

The grade should be selected from the calculated tensile load, expected drilling torque, well depth, trajectory and fatigue exposure.

E75 may be adequate for moderate loads, while X95, G105 and S135 provide progressively higher pipe-body strength. However, the complete drill pipe assembly must be checked because the tool joint or connection may become the limiting component.

Does S135 mean the drill pipe is suitable for sour service?

No. S135 is a high-strength drill pipe grade and is not the same as a sour-service designation.

API licensing information identifies high-strength grades such as X, G and S separately from SS sour-service grades. For an H₂S well, the buyer must specify the actual sour-service requirements, H₂S exposure, temperature and applicable material restrictions.

Can two drill pipes with the same NC50 connection be used interchangeably?

Not automatically.

Both products may use NC50 threads but have different tool joint OD, pin ID, bevel diameter, tong-space length, upset geometry or torsion ratio. These dimensions should be compared before mixing the products in one drillstring.

Why can the torsion ratio be below 1.0?

A ratio below 1.0 indicates that the calculated tool joint torsional capacity is lower than the pipe-body torsional capacity for that configuration.

This does not automatically make the drill pipe unsuitable, but it means the connection and tool joint may determine the allowable operating torque.

How should NC46 and NC50 drill pipe be selected for 4-1/2-inch pipe?

The selection should consider the existing drillstring connection, required torque, tool joint OD, internal flow area and available annular clearance.

NC50 can provide a larger connection configuration, but its larger tool joint dimensions may affect casing clearance and hydraulic performance. The final choice should be based on the complete drillstring design.

What information is required to replace the existing drill pipe?

Provide:

• Nominal pipe OD
• Nominal weight
• Steel grade
• Upset type
• Connection
• Tool joint OD
• Pin and box ID
• Bevel diameter
• Pin and box tong lengths
• Overall length
• Hardbanding details
• Internal coating requirements
• Existing manufacturer and part markings

Clear photographs and an existing inspection report are also helpful.

Is a larger tool joint OD always better?

No.

A larger tool joint OD can increase wear allowance and may improve torsional capacity, but it can also reduce annular clearance, increase external contact and affect fishing-tool or casing compatibility.

The tool joint OD should be balanced against the wellbore and drillstring requirements.

What inspection documents should be supplied with API drill pipe?

The agreed documentation package may include:

• API certificate
• Certificate of Conformity
• Material test certificate
• Mechanical property report
• NDE report
• Weld-zone inspection record
• Dimensional inspection report
• Thread-gauging record
• Hardness report
• Drift inspection record
• Hardbanding report
• Internal coating report
• Packing list and traceability records

Can hardbanding be added to new drill pipe?

Yes, when required by the drilling program and approved by the end user.

The hardbanding material, position, width, casing-friendly requirement and inspection criteria should be stated before production.

Information Required for Quotation

For an accurate drill pipe quotation, please provide:

• Nominal outside diameter
• Nominal weight
• Steel grade
• Upset type
• Connection type
• Tool joint outside diameter
• Tool joint inside diameter
• Required length
• Required quantity
• Hardbanding requirement
• Internal coating requirement
• Sour-service requirement, if applicable
• API certificate requirement
• NDE and inspection requirements
• Third-party inspection requirements
• Product marking requirements
• Destination country
• Required delivery schedule

For replacement drill pipe, also provide existing pipe markings, dimensional data, inspection reports and product photographs.

Request a Technical Quotation

Goldenman supplies API 5DP drill pipe for oil and gas drilling, workover, geothermal and replacement drillstring projects.

Available configurations include E75, X95, G105 and S135 grades, multiple nominal weights and NC or FH tool joint connections.

Send your pipe size, weight, grade, connection, tool joint dimensions, hardbanding and inspection requirements to:

Email: info@goldenman.com

Goldenman will review the drillstring requirements and prepare a technical datasheet and commercial quotation for the appropriate drill pipe configuration.