非磁钻头领

Non-magnetic drill collarDrill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity.1. Material introductionMaterials of the Non-magnetic drill collar are from chrome manganese, low carbon obtainedby combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.2. Properties introduction When the magnetic intensity is 1*105/4πA/m, the relative permeability of the non-magnetic drill collar is μr<1.010. Magnetic induction intensity of the non-magnetic drill within any 100mm space between the internal holes of non-magnetic drill collar<0.05μT.