drill pipe introduction

Drill pipes are divided into three categories: square drill pipe, drill pipe and heavy-weight drill pipe. The connection order is square drill pipe (1 piece) + drill pipe (n pieces, determined by the well depth) + heavy-weight drill pipe (n pieces, determined by the drilling tool combination design).

Bare tubes and raw steel pipes are made into drill pipes in a number of processing steps. First, the outer surface of the bare tube is bent inwards and the tube wall is thickened through the thickening process. Next, the threading is done and copper is plated to increase strength. Then a non-destructive quality control inspection is carried out, followed by welding of the pipe body joints. The pipe body then undergoes a weld heat treatment and a weld final treatment to eliminate weld residual stresses. Other tests are carried out on the finished drill pipes before they are painted and packaged, including hardness testing, pressure testing and non-destructive testing.

The steel grade of drill pipe refers to the grade of drill pipe steel, which is determined by the yield strength of drill pipe steel. API (American Petroleum Institute) divides drill pipe steel grades into five grades: D, E, 95 (X), 105 (G), 135 (S). The higher the drill pipe steel grade, 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 wall thickness.

#oiltools #drillingtools #oilandgas #drillingservice #drillingcontractor #oilfieldequipment #energyservice #oilfieldservices #onshore #offshore

Email: [email protected]

WhatsApp: +86 19930727857