The Field Inspection and Research of Related Problems about a Kind of Non-API Thread Connections

Abstract:

Compared with API (American Petroleum Institute) OCTG (Oil Country Tubular Goods) thread, Non-API thread OCTG has excellent sealing performance and high joint strength for greater depth, higher pressure and temperature, other more rigorous working conditions as well. This paper describes the special structures of a kind of Non-API connection in specific, which is widely used in domestic oil field and gas storage, detailed examination of this connection and recommended practice to measure its thread. So as to provide some useful reference and help for field inspection, it also focuses on the connection’s unusual measure items and points some problems in the process of thread inspection.

• Periodical: Applied Mechanics and Materials (Volumes 300-301)
• Pages: 982-987
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.300-301.982
• Online since: February 2013
• Authors: Jian Wu, Zun Yi Wei, Xin Li Han
• Keywords: Connection, Measure, Method, Non-API

References

[1] J.Q. Zhang, The type and characteristics of the foreign OCTG, steel pipe, Vol. 34, No. 3, (2005) pp.56-60.

[2] API SPECIFICATION 5B, Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe Threads, 15th Edition, (2008).

[3] Q/SY-TGRC 12, Field inspection of premium connection for casing or tubing, (2009).

[4] VAT-RECOMMENDED PRACTICE, VAT / PR / FI-GEN, REV.: 2.

[5] Q/SY-TGRC 5, Qualification and Certification of inspectors for Petroleum Tubular Goods Threads, (2009).