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由兰州石油化工机器厂等六个单位联合开发的ZJ45D丛式井钻机于1989年7月2日通过部级技术鉴定。 ZJ45D丛式井钻机属国家“七五”重点科技攻关项目,它的问世是我国电驱动丛式
ZJ45D cluster well drilling machine jointly developed by six units including Lanzhou Petrochemical Machinery Factory passed ministry-level technical appraisal on July 2, 1989. ZJ45D cluster well drilling rig is a national “Seventh Five-Year” key scientific and technological project, its advent is our country electric drive cluster