HARDBANDING CONTAINERISED UNIT.
What is Hard banding”
Hard banding has long been acknowledged as an effective means of preventing tool joint wear. During the 1990s, tungsten carbide-based hard banding was in widespread use and was determined to be the primary cause of casing wear. However, the absence of hard banding, while slowing casing wear to a small degree, allowed the tool joints to wear at an accelerated rate, lessening the torsional capacity of the drill pipe and putting drilling operations at serious risk.
The challenge was to discover a balanced, simultaneously effective solution between both casing wear defense and tool joint protection, which is caused by the worsening conditions associated with highly deviated ERD wells. Previous casing friendly alloys reduced casing wear but produced unacceptable tool joint wear as a consequence. Crack-prone design flows ware also present, as widespread cracking of the alloy material often
Ensued. This coursed catastrophic tool joint failure and in some cases, even the failure of the hard banding itself, due to tool joint spalling