... and RT protection) .7)with the online monitoring system for working s tatus of mechanical, electric, hydraulic and pneumatic implements, failure ... cluster well drilling.10)Satisfying the requirement for TDS installation......Rig ModelZJ20DBS ZJ30DBSZJ40DBSZJ50DBSZJ70DBSNominal drilling depth, 127mm(5)DP, m20003000400050007000Max. hook load ...