Drill collar use: one of the most important parts of the drill string, it has the function of providing drilling pressure to the drill bit and improving the rigidity of the drill string.
Product description: It is made of AISI4145H chromium molybdenum steel to effectively control the content of trace elements. According to the shape and material of the drill collar, it is divided into three forms:
1. Type A (cylindrical type): It is made of ordinary alloy steel, and the cross section of the tube body is round drill collars both inside and outside.
2. Type B (spiral type): It is made of ordinary alloy steel and has a drill collar with spiral grooves on the outer surface of the tube.
3. Type C (non-magnetic type): It is made of stainless alloy steel with very low magnetic permeability. The cross-section of the tube body is round drill collars both inside and outside.