Yepakati uye yakaderera mhepo DTH mabhiti
Zvakanakira zveHFDdive drilling
Iyo drill bit inogadzirwa nealloy material, iyo ine hupenyu hurefu hwebasa uye yakakwirira kudarika zvigadzirwa zvakafanana, uye chibooreso chinopwanya dombo nekukanganisa uye kugera. HFD drill bits ine yakasimba kusakara uye inokodzera kucheresa zvakapfava uye zvakaoma(9-grade drillability of rock,hard rock drilling) , zvichienzaniswa ne- normal bit, kunyanya pakuboora 6-8 grade rock mhedzisiro yacho inonyanya kukosha.
