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Good Quality Drill pipe

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Dynoland International Trading Co., Ltd.
Dynoland International Trading Co., Ltd.
City: Beijing
Province/State: Beijing
Tel: 86-10-81532501
Contact Person:
Aaron Liu

Good Quality Drill pipe

Place of Origin : Shanghai
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Drill pipe


API 5DP drill pipe is a kind of steel pipe with screw thread in the pipe end. It is used for connecting ground rig equipment and drilling grinding equipment at the bottom of drilling wells. The main purpose of drill pipes is to transport drilling mud to the drill bit. It rises up, lowers and rotates together with the drill bit. Its strength must withstand the pressure, torque, vibration and other forces caused by the drill hole. In the oil and gas exploration and refining process, API 5DP drill pipe can be used for multiple times. We provide a number of drill pipes available in various sizes and weights to meet the drilling needs of companies in the oil and gas industry.


Functions API 5DP drill pipe is mainly applied in oil and gas exploration and development, such as in the construction of deep wells, horizontal wells and large-displacement wells. Its main functions are as follows:

• Drill pipes deliver torque and drive the drill bit to drill wells.

• Exert pressure that can break the rock at the bottom of well on the drill bit.

• API 5DP drill pipe transmits flushing fluid. Through the ground high-pressure slush pump or mud pump, drill mud enters into the inner hole of drill string, flows into the bottom of well to wash rock debris and to cool down the drill bit, passes through the annular space between the drill string outer surface and well wall (carrying rock debris), returns to the ground. Thus, we achieve the well drilling purpose.


Applicable Scope of API 5DP Drill Pipe

• It can be applicable for series of oil drill pipes with API E75 to S135 steel grades and the outer diameter of 2 3/8″ to 6 5/8″.

• It can be used as double circular bead joint drilling pipe with high torsional performance.

• It can be applied as BNK C95S drilling pipe of special steel grades for sulfur oil wells.

• API 5DP drill pipe is furnished in the following API length ranges: range 1 (18 ft to 22 ft), range 2 (27 ft to 30 ft) and range 3 (38 ft to 45 ft).

Advantages of our Drill Pipes

Quality Inspection

• Our API 5DP drill pipe has received API 5D standard certification. In order to ensure product quality, our company implements a comprehensive detection and control system, and develops a strict management system.

• 1) Specific products carry out the second party supervision, third-party supervision and third-party inspection. Currently there are more than 10 companies in long-term resident supervision. Almost all key drill pipes are under third-party or second party supervision.

• 2) We make use of advanced ERP information management system. From batch feeding to finished API 5DP drill pipe, we strictly implement tracking management to ensure product traceability.

• 3) We manufacture key products in strict accordance with quality plan. There are different quality plans for new product development, mass production of products, major products and all of the second or third-party supervised products. We also hold preparation meetings before production and issue the quality plans to the relevant quality executive departments. The executive departments should produce and inspect drill pipes in strict accordance with quality plans to ensure product quality.

Equipment Advantage

• 1) Our API 5DP drill pipe welding production line is configured with one CG1600 inertia friction welder, nine sets of Q1319-1A pipe threading machines, two sets of CNC pipe threading machines, seven welded bead heat treatment medium frequency induction heating furnaces, internal bore grinding machine, straightening machine, bending testing machine and three sets of inspection machines. This line for drill pipes can produce 20,000 tons of dill pipes every year.

• 2) Our API 5DP drill pipe adopts upset welding method. The upsetting production line is equipped with three induction heating furnaces, one upsetting machine and one set of ancillary equipment. The annual production of drill pipes is 10,000 tons. After upset welding, the drill pipe acquires good wear resistance, high joint strength, high machining precision, high welding strength, good overall performance, low price and high cost performance.

• 3) The surface nitriding treatment of screw thread can effectively prevent thread gluing, improve the wear resistance of thread, and thereby enhance the service life of the API 5DP drill pipe. Thickness of the nitration layer is generally from 0.2 mm to 0.3 mm. Too large thickness is easy to cause cracking flaws. Too small thickness will result in poor thread gluing resistance. Integrated drill pipes should do phosphate treatment with much smaller thickness, rather than nitriding treatment.

• 4) Joint thread should be processed by the thread turning tool on the CNC lathe. We make efforts to improve the thread surface quality, reduce the surface roughness (Ra ≤ 1.6μm), improve the degree of finish and reduce stress concentration. These measures can ensure the interchangeability of API 5DP drill pipes. The standoff of joint threads should be controlled in a reasonable range so as to ensure a good drill thread engagement.

Performance Advantage

• Our drill pipes' body has high tensile strength, good bending performance and good toughness. The body uses carbon alloy seamless steel pipe. Alloying elements should contain more Cr, Mo and other elements to improve the tensile strength and impact toughness, and contain Mn, Si and other elements to improve the elasticity of the material (i.e. bending performance). Mechanical properties of API 5DP drill pipes are as follows:


Drill Pipe


Mechanical Properties of API 5DP Drill Pipes


·Other Advantages

· 1) Our drill pipes are manufactured in accordance with API 5DP standards. It has low levels of P and S chemical compositions (containing P with the amount of less than or equal to 0.015 and with less than or equal to 0.003 S).

· 2) The body of Our API 5DP drill pipe has better thickness evenness, fewer rolling defects and higher finished product rate.



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