Wuhan ninestones X6 / X7 / X8 koob.

X6 / X7 Series yog High-ແ compreh່ງ ranniensive PDC nrog kev ntsuas hluavtaws ntawm 7.5-8.0gpa.
Cov hnav tsis kam (qhuav txiav granite) xeem yog 11.8km lossis ntau dua. Lawv muaj cov kev coj ua tsis kam tawm tsam thiab kev cuam tshuam nyuaj, tsim nyog rau kev siv hluav taws xob hauv ntau cov pob zeb nyuaj rau quartz sandstone, limestone, thiab interlayer-nplua nuj pob zeb. Tus x6 series yog tus cwj pwm los ntawm kev txiav kom cov ntug kev ceev thiab qhov siab drilling ceev.
X8 Series yog Super High-Track dav dav PDC nrog cov khoom siv hluavtaws ntawm 8.0-8.5gpa
Cov hnav tsis kam (qhuav txiav granite) xeem yog 13.1km lossis ntau dua. Raws li kev cuam tshuam siab tiv taus, nws muaj qhov tsim nyog rau kev khiav tawm hauv ntau cov kev ua yeeb yam, tshwj xeeb tshaj yog nyob rau hauv cov kev nyuaj ua ke nrog kev sib cuam tshuam nrog interlayers.