Petroleum Drill Bit He hana koʻikoʻi ka bit drill petroleum i ka wili ʻaila, hoʻololi nui i ka maikaʻi o ka wili, pono, a me nā kumukūʻai. ʻO nā ʻano o nā ʻāpana hoʻoheheʻe ʻaila e komo i nā ʻāpana scraper, nā ʻāpana cone roller, nā ʻāpana daimana, a me nā ʻāpana PDC (polycrystalline diamond compact bits). ʻO kēia ʻatikala ...
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