Ka tukuna e ngā mata keri keri IADC635/IADC735 9 7/8 inihi te mahi kaha mō ngā hanganga whakakoi waenga-pakeke ki te pakeke pērā i te kōhatu, te onepū, me te dolomite. Mā ngā whakaurunga tungsten carbide kounga teitei ka whakarite kia tere te uru me te ātete ki te kakahu tino pai. Mā ngā peera roera hiri me te tiaki ine pakari ka roa ake te ora ratonga me te whakanui ake i te pumau. Mā ngā hononga paerewa API ka whakarite kia pono te hototahi. Mā te hanganga tapahi me te tohanga kua arotauhia ka whakapai ake i te pai o te keri, ka whakaiti i te wā kore mahi, ka whakaiti i ngā utu whakahaere, ka pai mō te keri keri uaua me te keri poka pahū.
Wā tuku: Maehe-04-2026