Heavy series Steel Drill Pipes are used for drilling wells with diamond bits with diameters 76 mm in soils V-IX categories in drillability.
The nominal drilling depth according to the assembly of drill pipes can be 1200, 2000 or 3000 m.
Technical characteristics of Heavy series Steel Drill Pipes
|Standard size||Pipe||Connector||Length L, m||Thread||Torque, Nm (±5%)|
|External diameter D, mm||Wall thickness t, mm||External diameter D1, mm||Internal diameter d, mm|
Mechanical properties of pipes (at least)
|Parameters||Pipe (steel strength K)||Pipe (steel 45)||Connector (special steel)|
|Tensile strength, MPa||686||539||882|
|Yield strength, MPa||490||323||686|
- Mechanical properties of the drill pipe as well as for the weld seam.
- Mechanical properties of connectors indicated after the volumetric heat treatment.
- Surface hardness after heat treatment: pipe – not less 40 HRC, heat treated connector – not less 55 HRC.