凿井工篆环 shaft sinking cycle ; sinking cycle

凿井工程 well drilling engineering

凿井施工测量 construction survey for shaft sinking

凿井包工公司 shaft sinking company

地热井开凿工程 Project of extracting geothermal well

注浆凿井法施工测量 construction survey for grouting sinking

人工凿井 hand sinking

普通凿井法施工测量 [测] construction survey for conventional shaft sinking method

特殊凿井法施工测量 construction survey for special method of shaft sinking