A non-magnetic drill collar mainly consists of the following parts:
1. Drill Collar Body: The drill collar body of a non-magnetic drill collar is typically made of high-hardness tungsten steel or high-speed steel, possessing strong wear resistance and toughness.
2. Inlay: To increase the hardness and wear resistance of the drill collar body material, a layer of hard alloy (or polycrystalline) is inlaid into the drill collar body.
3. Coolant System: Because magnetic drill collars generate high temperatures during drilling, causing premature wear of the drill collar body and drill bit, non-magnetic drill collars require the spraying of coolant during drilling to achieve cooling and lubrication.
4. Drill Bit: The drill bit of a non-magnetic drill collar typically consists of triangular or rhomboid teeth, with hard alloy shims added to the teeth to improve penetration.
