Oil Land Drilling Rigs 
ZJ40/2250DZNominal drilling depth(114mm drill pipe):     2500-4000mMax. hook load rating:                     2250kNMax. number of lines for travelling system        :    10Dia. of wire line:                          32 (1-1/4) mm(in)O.D. of sheave in traveling system              1120 (44)  mm(in)I.D. of swivel stem                         75 (3) mm(in)Rated power of drawworks                  735 (1000) kW(hp)Transmission of drawworks                   4 
ZJ50/3150DBNominal drilling depth(114mm drill pipe)       3500-5000mMax. hook load rating                     3150 kNMax. number of lines for travelling system             12Dia. of wire line                          35 (1-3/8) mm(in)O.D. of sheave in traveling system            1270 (50) mm(in)I.D. of swivel stem                        75 (3) mm(in)Rated power of drawworks                 1100 (1500) kW(hp)Transmission of drawworks     Stepless speed regulation 
Model ZJ30J/1700Nominal drilling depth    10,000ft (5" DP)Max. hook load rating     1700kNRated power of drawworks    900hpMast clearance      147ftSubstructure type Box on boxDrill floor height    16.5ftSubstructure clearance   12ft The petroleum drilling rigs are classified into 5 grades by the nominal drilling rig range limit and the maximum hook load: ZJ30/1700, ZJ40/2250, ZJ50/3150, ZJ70/4500, ZJ90/5850 By the drive type: Electric Drive Drilling Rigs, Electromechanical Drilling Rigs, and Mechanical Drive Drilling Rigs