Drill Collar /pipe

Integral heavy weight drill pipe is manufactured from AISI 4142H-4145H modified drill collar material according to SY/T 5146-1997,thick-walled pipe called integral heavy weight drill pipe was developed to provided a gradual transition from the heavy drill collars to the relatively light weight drill pipe. This intermediate weight pipe has a wall thickness of approximately, and helps prevent stress concentration at the top of the drill collars. It also allows you to drill at higher rpms, reducing torque and differential pressure sticking. It is intended primarily for directional drilling. Because it bends easily, it simplifies directional control and minimizes connection fatigue problems common to high angle or horizontal drilling. The reduced number of pipe failures and increased drill stem service also make it appropriate for some straight-hole applications.

Technical parameter

 

Integral heavy weight drill pipe Size Outer diameter Inside diameter Joint outer diameter Joint inside diameter Connecting thread Slip max. diameter Upset middle diameter Min. drift diameter 3 1/2 3 1/2 2 1/4 4 3/4 2 1/4 NC38 3 7/8 4 2 2 1/16 (4 7/8, 5) 2 1/16 1 13/16 4 4 2 1/2 5 1/4 2 1/2 NC40 4 3/16 4 1/2 2 1/4 2 9/16 2 9/16 2 5/16 4 1/2 4 1/2 2 11/16 6 1/4 2 11/16 NC46 4 11/16 5 2 7/16 2 3/4 2 3/4 2 1/2 2 13/16 2 13/16 2 9/16 5 5 3 6 5/8 3 NC50 5 1/8 5 1/2 2 3/4 5 1/2 5 1/2 3 1/4 7 3 1/4 5 1/2 FH 5 11/16 6 3 3 3/8 (7 1/4, 7 1/2) 3 3/8 3 1/8 3 7/8 3 7/8 3 5/8 4 4 3 3/4 6 5/8 6 5/8 4 8 4 6 5/8 FH 6 15/16 7 1/8 3 3/4 4 1/2 (8 1/4, 8 1/2) 4 1/2 4 1/4 5 5 4 3/4 Spiral heavy weight drill pipe Specification mm Tube Joint ID mm Elevator upset mm elevator groove mm Screw in diameter mm Spiral groove depth mm Thread Type OD mm ID mm 88.9(3 1/2) 54 92.1 88.9 101.6 9.5 NC38 120.6 54 114.3(4 1/2) 69.8 117.5 114.3 127 12.7 NC46 158.8 69.8 127.0(5) 76.2 130.2 127 139.7 12.7 NC50 165.1 76.2 Yield strength Tensile Strength Elongation HB Charpy impact MPa Psi MPa Psi A% Akv J ≥758 ≥110000 ≥965 ≥140000 ≥13 285~341 ≥54