Imodeli ye-GGQH ye-casing scraper isetyenziselwa ukuphelisa i-samente eseleyo kunye ne-clod kudonga lwangaphakathi lwe-casing, i-burr kunye nesikali esenziwe ngexesha lokuqengqeleka, i-bullet inset kwi-casing wall xa uqhuba ukutyhoboza kwesanti, kunye nentsimbi yentsimbi, isikali samanzi kunye neparafini enzima kwimveliso yecasing. , kunye nokunye...
Funda ngokugqithisileyo