Drill collar

Description

Description: It?s made from rolled or forged AISI***5H chrome-molybdenum steel. The content of chemical composition and microelement is controlled efficiently throughout the whole process.
? According to its different figures and materials, it can be divided into three types:
Type A (columnar) : made from ordinary alloy steel, both inside and outside of the cross section of the pipe are cyclical.
Type B (spiral): made from ordinary ally steel, with a spiral chute on the outer surface of the pipe.
Type C (non-magnetic): made from stainless alloy-steel of low magnetic permeability, both inside and outside of the cross section of the pipe are rounded.
Main Functions: it?s one of the most important components of drill stem. It can provide the bit with bit weight and improve the rigidity of drill stem.
? It?s in accordance with the standard of SY/T********7 or API SPEC.**1.
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