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DEPTH CAPACITY (metres)International naming.
Drill stringNWL66BTWWL56/46
Vertical downWL 46 mmAQWL 56 mmBQWL 66 mmNQWL 76 mmHQ
“N”-head120010001200800800600700Not suited
Vertical downWL 46 mmAQWL 56 mmBQWL 66 mmWL 76 mmNQHQ
“H”-headNot suitableNot suitable15001300130010001000600