Drilling Pipe Inspection

1. Drill Pipe Body Inspection

The drill pipe body is inspected to identify defects that may compromise tensile strength, pressure containment or fatigue resistance.

Inspection may include:

• Visual inspection of pipe body.
• Identification of dents, cuts, gouges and mechanical damage.
• Corrosion and pitting assessment.
• Wall thickness measurement.
• Straightness checks.
• Slip and tong mark assessment.
• Hardbanding condition check.
• Pipe body wear evaluation.
• Internal and external condition assessment.
• Identification of heat damage or arc strikes.

Drill pipe bodies operate under cyclic loading, torque, bending and tensile stress. Even small defects can become critical when exposed to repeated drilling loads.

2. Tool Joint and Connection Inspection

Tool joints and rotary shouldered connections are critical because they transmit torque and tensile loads through the drill string.

Inspection may include:

• Pin and box thread inspection.
• Shoulder condition inspection.
• Seal surface inspection.
• Connection wear assessment.
• Thread galling inspection.
• Thread profile verification.
• Tool joint outside diameter measurement.
• Tool joint inside diameter measurement.
• Bevel diameter check.
• Counterbore condition check.
• Evidence of over-torque or poor make-up.
• Connection damage classification.

Client value: proper connection inspection helps prevent washouts, connection failure, fatigue cracks, leakage and drill string separation.

3. Magnetic Particle Inspection

Magnetic Particle Inspection may be used to detect surface and near-surface cracks in ferromagnetic drill stem components.

It is commonly applied to:

• Tool joints.
• Thread roots.
• Stress concentration areas.
• Upset areas.
• Drill collars.
• Heavy weight drill pipe.
• Rotary shouldered connections.
• Critical welds or repaired areas.

This method is useful for detecting cracks that may not be visible during normal visual inspection.

4. Ultrasonic Thickness Measurement

Ultrasonic thickness measurement may be used to evaluate remaining wall thickness and identify metal loss caused by corrosion, erosion or wear.

It is commonly applied to:

• Drill pipe bodies.
• Heavy weight drill pipe.
• Drill collars.
• Casing.
• Tubing.
• Pressure-retaining components.
• Corroded or worn sections.

Client value: thickness measurement helps determine whether tubulars remain fit for service or require downgrading, repair or removal from use.

5. Dimensional Inspection

Dimensional inspection verifies whether critical dimensions remain within acceptable limits.

Inspection may include:

• Outside diameter.
• Inside diameter.
• Wall thickness.
• Tool joint dimensions.
• Connection dimensions.
• Thread profile.
• Shoulder width.
• Bevel diameter.
• Tong space.
• Pipe straightness.
• Length verification.
• Drift testing, where required.

Dimensional control is essential because excessive wear or deformation can affect connection integrity, hydraulic performance and compatibility with drilling tools.

6. Thread and Seal Surface Inspection

Threads and sealing shoulders are critical contact surfaces. Damage in these areas can cause poor make-up, leakage, connection fatigue or washout.

Inspection may identify:

• Galling.
• Cracked threads.
• Worn threads.
• Pulled threads.
• Damaged shoulders.
• Corrosion in threads.
• Seal surface damage.
• Cross-threading.
• Incomplete make-up signs.
• Handling damage.
• Contamination or poor preservation.

Client value: thread inspection helps prevent connection failure and improves reliability during rig operations.

7. Hardbanding and Wear Protection Inspection

Hardbanding is used to protect tool joints and reduce wear. However, damaged, cracked or excessive hardbanding can create problems during drilling.

Inspection may include:

• Hardbanding condition.
• Cracking.
• Spalling.
• Excessive wear.
• Compatibility concerns.
• Tool joint protection condition.
• Impact damage.
• Raised or uneven hardbanding.
• Need for repair or reapplication.