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Model of rig JC40DB JC50DB JC70DB Nominal drilling depth, m(ft) with Ф114mm(41/2”)DP 2500-4000(8200-13100) 3500-5000(11500-16400) 4500-7000(14800-23000) with Ф127mm(5”) DP 2000-3200(6600-10500) 2800...