IADC Code Piav Qhia Thawj tus lej qhia txog qhov nyuaj ntawm lub pob zeb tsim los ntawm lub pob laum me ntsis. Txhua lub laum me ntsis yog tsim rau ib qho kev tsim pob zeb, categorized los ntawm nws cov hardness. Cov cuab yeej tau txais tus lej los ntawm 1 txog 8, xav txog hom pob zeb qhov cuab yeej drilling cov hniav lossis cov nyees khawm yog tsim los rau:
1, 2, 3: Qhia cov hniav hlau. 1 yog tailored rau soft formations, 2 rau nruab nrab formations, thiab 3 rau hard formations.
4, 5, 6, 7, thiab 8: Sawv cev tungsten carbide inserts (TCI). Nyob rau hauv no ntau yam, 4 yog faib rau softer formations, thiab 8 rau lub hardest formations.
Tus lej thib ob muab kev nkag siab ntxiv rau kev tsim pob zeb. Txawm hais tias cov hniav zoo li cas, tus lej no suav nrog txhua yam ntawm cov laum me ntsis thiab ua rau cov pob zeb tsim tau zoo tshaj plaws rau kev khawb ntawm qhov ntsuas ntawm 1 txog 4. Mos formations yog denoted los ntawm 1, escalating mus rau 4 rau qhov nyuaj formations.
Tus lej thib peb qhia txog hom kabmob uas siv rau hauv lub laum me ntsis. Piv txwv li, tri-cone laum ntsis siv cov bearings sib txawv raws li cov khoom siv tho.
1, 2, thiab 3: Qhia cov menyuam bearings. 1 sawv cev rau tus qauv rau cov menyuam bearings, 2 qhia txog huab cua-txias bearings, thiab 3 qhia tias qhib bearings nrog kev ntsuas siab tiv thaiv. 4 thiab 5: Qhia kaw cov menyuam bearings. 4 txhais tau hais tias tus qauv kaw cov menyuam bearings, thaum 5 qhia txog kev kaw cov menyuam bearings nrog ntsuas kev tiv thaiv. 6 thiab 7: Muab cov ntaub ntawv kaw tseg. 6 sawv cev rau cov txheej txheem kaw cov ntawv xov xwm, thaum 7 qhia txog cov ntaub ntawv kaw lus nrog cov cuab yeej tiv thaiv. Tus lej thib plaub yog ib tsab ntawv qhia txog kev xyaum ua haujlwm tshwj xeeb.
