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Specification and steel grade strength of drill pipe
release time：2023-08-25
source： Network
Specifications
According to the regulations of the American Petroleum Institute (American Petroleum Institute)(API), drill pipes are divided into three categories according to length (L): the first category: 5.486-6.706m(18-22ft); The second category (commonly used):8.230-9.144m(27-30ft); The third category: 11.582-13.716m(38-45ft). Drill pipe can also be classified by outside diameter size. The sizes (d) of commonly used drill pipes are 88.9,114.3 and 127mm (customarily expressed in English sizes: 3 1/2 "4" 5 ").
Steel Grade and Strength
The steel grade of the drill pipe refers to the grade of the drill pipe steel, which is determined by the yield strength of the drill pipe steel. The API (American Petroleum Institute) classifies drill pipe steel into five grades: D, E, 95(X), 105(G), and 135(S). The higher the steel grade of the drill pipe, the greater the yield strength of the pipe, and the greater the various strengths of the drill pipe. In the strength design of the drill string, it is recommended to increase the strength of the drill string by increasing the steel grade instead of increasing the thickness of the wall.
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