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Sunrise petro : Three main types of OCTG threading

2024-02-05 13:11 237 views

Oil Country Tubular Goods (OCTG) pipes play a crucial role in the oil and gas industry, where they are used for various drilling and production applications. The threaded connections of OCTG pipes simplify installation and coupling in the well, ensuring a secure connection that can withstand the demands of the harsh downhole environment.

There are three main types of OCTG threading: Short Round Thread Casing (STC), Long Round Thread Casing (LTC), and Buttress Thread Casing (BTC).

  1. Short Round Thread Casing (STC): This type of threading is a good choice for shorter-length casing applications that do not involve high axial loads or bending. The STC design features a short thread length, which reduces the stress on the connection, making it suitable for use in shorter casing sections where axial loads are not significant.
  2. Long Round Thread Casing (LTC): This threading type is well suited for situations where some axial load is encountered but overall well conditions do not include extremes of temperature or pressure. The LTC design offers a longer thread length, providing greater strength and fatigue resistance, making it suitable for longer casing sections or where mild axial loads are present.
  3. Buttress Thread Casing (BTC): This is a popular threading type due to its combination of strength and durability. The BTC design features a thicker thread root and flattened crests, which provide additional resistance to axial and bending loads. It is suitable for use in wells with high axial loads, bending moments, and temperature and pressure extremes.

Each type of OCTG threading has its specific applications and advantages based on the well conditions and requirements. Understanding the characteristics and limitations of each threading type is crucial for selecting the appropriate OCTG pipe and threading design for a particular drilling or production operation.


Sucker Rod Pump
Sanjack has decades of history in tubing thread processing with advanced production equipment, complete testing methods and high-qualified inspection team. To ensure the quality of tubing products, our company strictly follows the ISO9001 quality system requirements from the production process, process plan, testing methods and management system, and strictly implements Sinopec Q/SHCG 18010-2016 “Casing and Tubing Purchase Technical Specifications”, combine the strict management, advanced manufacturing equipment with scientific inspection methods organically, grasp the quality control of each process, there is a complete quality control system from raw material inspection to the factory Inspection.

Any question about OCTG ,
please email 
sales@sunrise-petroleum.com , you will get reply within 12 hours!

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