The first domestic 7-meter diameter reverse circulation drilling rig's ventilation shaft has been completed
According to the official WeChat account of POWERCHINA Ltd, recently, at the Zhejiang Jingning Pumped Storage Power Station, which was invested in, designed, and constructed by POWERCHINA Ltd, the domestic first 7-meter diameter reverse well drilling machine successfully completed the ventilation shaft, filling the technical gap of ultra-large diameter reverse well drilling machines in China
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