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Drill Pipes

The Drill pipes, HWDP, Drill Collars are manufactured conforming to API 5D,API SPEC 7. The material of drill pipe body is up to the 1 &3 group of API 5D.(Group 1—grade E75; Group 3—grade X95,G105,S135 ) The matching tool joints are according to your requirements which are up to API standards.

Advanced friction welding production line of drill pipe

1) Being applied inertial friction welding technique, to adjust friction welding parameters to the optimum to ensure welding quality.

2) Being applied high power collector coil to narrow heat-affected area, with coinstantaneous inner-outer heat treatment in a properly pipe’s rotation speed, so as to ensure high even stable mechanical performance of friction welding area.

3) Being equipped with automatic measuring machine for length and weight, as well as automatically marking machine to ensure the traceability.

Advanced upsetting and thermal treatment line

800T up setters to ensure the size of thickened pipe-end to meet API SPEC-5D requirements. Full length pipe heater, quenching unit and tempering stove to ensure the mechanical property of pipe body. Automatic co-alignment unit with 6 rollers and hydraulic co-alignment for pipe body to ensure straightness and coaxial

Drill Collars

Normal Drill Collars

Drill Collars are integral heavy wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties, then trepanned, drifted and threaded. Drill collars are furnished as slick or spiraled in 30 or 31 foot lengths.

Traceability

From receipt of mill’s certified raw material to the completion of all the processing, in each process of which complete traceability mechanism work craft. Serial numbers are die stamped on bar bodies.

Routine and strict inspection procedures

All our drill collars are inspected to comply with the API standards. These inspections include fluorescent magnetic-particle detection and inner ultrasonic flaw detection and hardness detection over the entire body of the drill collar as well as other mechanical performance detection.

Cold rolling process

The thread roots, and the elevator recess, shall be cold-rolled. Cold rolling creates such compressive upper radius stress that increases fatigue resistance by minimizing crack initiation.

Phosphate-coated or copper plating

All connections shall undergo phosphate-coated or copper plating process to ensure corrosion resistance, so as to avoid galled thread.

Slip groove, elevator groove and size

Our company offers optional slip and elevate and accepts reprocesses orders, improving the handling efficiency and guarantee safety. Unless special specification is required, slip and elevator are processed in compliance with API rp 7G guidelines.

Thread protectors

Steel, cast steel, and plastic steel thread protectors for the drill stem products are subject to your requirements.

SPIRAL DRILL COLLARS

Spiraled drill collars have grooves machined in the outside surface. The spiral grooves promote even flow of drilling fluid around the collar diameter, equalizing pressure and reducing the occurrence of differential sticking

Spiral grooves make mud circulate freely around the drill collar to equalize pressure for sake of drill pipe sticking. It reduces the probability of sticking occurrence due to different pressure through reduction of touching area. Spiral drill collar is widely used because of its special structure. The special grooves decrease the volume of the contact with the well wall. It leads to the decrease of the sticking and turning of the drill pipe string.

The weight of Spiral drill collar will be reduced approximately 4%-6% by spiral conversion. Inspections for spiral drill collars: According to API SPEC, each collar undergoes inspections, including thread fluorescent magnetic-particle detection and full-length ultrasonic flaw detection and to ensure the quality.

NON-MAGNETIC DRILL COLLAR

Adopts a kind of chrome manganese alloy steel as material, low carbon obtained by combining a proprietary chemical analysis and rotary hammer process. The material is resistant to corrosion crack, with low magnetic conductivity, with no tendency to galling and high wear proof performances.

Non-magnetic Properties
Relative Max: 1.010
Average: ≤ 1.005
Max. B≤ 0.05 Micro Tesla/100 mm

Using Drill Pipe Effectively on Site

In large-scale drilling operations, multiple drill pipes are connected to reach deeper underground formations. To ensure performance and safety, the strength and quality of the metal are critical. The pipe must withstand immense pressure, torque, and vibration without fracturing. Because drill pipes can be expensive, many are reused after proper inspection and maintenance. For deep well drilling, high-strength alloy or toughened steel is used due to its excellent resistance to stress and fatigue.

After a drilling operation, each pipe is transported to a new location for a comprehensive inspection. The goal is to determine whether it remains fit for future use before being reclassified or resold. Technicians use advanced tools such as ultrasonic testing equipment and precision spherometers to detect cracks or weaknesses in the metal. Based on the inspection results, pipes are categorized into different grades:

  • N Grade – New pipes

  • P Grade – Premium quality, reusable pipes

  • C1, C2, C3 Grades – Used pipes showing increasing levels of wear

Pipes rated below C3 are marked with a red band, indicating they are no longer suitable for drilling and are classified as scrap metal.

Alongside pipe inspection, the Bottom Hole Assembly (BHA) is also examined. This section, located just above the drill bit, is made from extra-heavy, high-strength metals to handle intense drilling forces and ensure stability at great depths.

How Drill Pipe Is Manufactured

Contrary to common belief, drill pipes aren’t made from rolled sheets of metal. Instead, they’re assembled from three main parts — the tube, the box tool joint, and the pin tool joint — which are welded together.

The process begins with steel or aluminum base tubes. The ends of each tube are “upset,” meaning they are thickened and roughened to form stronger joints. Upsetting can be done internally, externally, or in combination, depending on the required strength and specifications. Once assembled, the pipes undergo heat treatment to achieve the ideal balance between toughness and flexibility.

The connectors and joints also receive similar treatment and are carefully machined into male (pin) or female (box) threaded ends. Because these joint sections endure the most stress, they are often the most vulnerable to wear or cracking. Manufacturers therefore follow precise heat tempering and quality control standards to minimize brittleness and prevent failure in high-pressure environments.

Choosing the Right Drill Pipe Supplier

When selecting drill pipes for your operations, it’s crucial to work with a trusted supplier who follows strict manufacturing and inspection standards. A reliable source, such as Tubular King®, ensures:

  • Use of high-grade steel or alloy materials

  • Accurate threading and connection design

  • Thorough inspection and quality testing

  • Products that meet API specifications

By understanding the manufacturing process and quality classifications, you can choose durable, high-performance drill pipes that deliver reliability, safety, and longevity for all your drilling projects.

 
 

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