... ZJ50LD, ZJ50JD, ZJ50D and etc. ZJ50L and ZJ50LD drilling rig have exported to oversea, and obtained reputation of high quality ... .Main Parameters of 5,000 Meters Serial Rig Description:Low position Drawworks; Friction clutch shift speed; ... and steady, high efficiency, and distribute load automatically.Drilling Rig ModelZJ50/3150JDZJ50/3150LZJ50/3150DNominal drilling depth, m5in, 5in DP3000 ...