... 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; ... start smooth and steady, high efficiency, and distribute load automatically.Drilling Rig ModelZJ50/3150JDZJ50/3150LZJ50/3150DNominal drilling depth, m5in, 5in ...