Drill Collar Selection Calculator

Answer two questions about your drilling program to see which China Welong drill collar type — Slick, Spiral, or Non-Magnetic — fits your BHA design, based on the same selection framework used in our technical guide above.

Based on the Drill Collar Selection Framework in our technical guide, informed by published drillstring failure-analysis research and the ISCWSA Grindrod-Wolff non-magnetic collar length selection method. Final selection should be confirmed with your drilling engineer.