Nyob rau hauv Suav teb thaum ub, zaj dab neeg ntawm Tus Txiv Neej Laus Foolish Tsiv Toj Siab qhia txog lub siab tsis muaj zog ntawm kev ua siab ntev los ntawm kev ua haujlwm qeeb thiab khov kho.

Thaum tib neeg nkag mus rau hauv lub xyoo pua 18th, Thawj Kev Lag Luam Kev Lag Luam tau coj tsis yog kev hloov pauv thev naus laus zis nkaus xwb tab sis kuj tseem muaj kev hloov pauv hauv zej zog, ua rau muaj kev hloov pauv hauv lub sijhawm uas cov tshuab pib hloov pauv kev siv zog. Txij thaum ntawd los, lub pob zeb drilling thiab excavation kev lag luam tau nce mus rau qhov nrawm dua, ruaj khov dua, thiab siv tau zoo. Thaum lub sijhawm txheej txheem no, ntau cov ntaub ntawv xov rau kev sib txuas ntawm cov pas nrig, suav nrog API tus qauv xov thiab yoj-puab trapezoidal threads, tau tsim.

Cov qauv kev ua haujlwm ntawm cov xov no txawv, ua rau muaj kev xav tau sib txawv. Ib tug kws tshaj lij hauv kev lag luam drilling tau tshaj tawm txog cov xov ntawm cov menyuam-cone laum rods thiab sab saum toj rauj laum rods. Cov kev nkag siab uas muab tau yog qhov tseem ceeb heev uas lawv tau hais tias muaj nqis tshaj li kaum xyoo ntawm kev kawm.

Petroleum roller-cone khoom ua haujlwm los ntawm kev sib hloov thiab sib tsoo pob zeb, nrog rau cov pas nrig siv API tus qauv xov. Cov xov no tsuas yog dais axial thrust, torsional rog, thiab qee qhov cuam tshuam quab yuam, yam tsis muaj kev cuam tshuam lub zog rau lub cev pas nrig. API tus qauv threads yog tsim los rau kev sib txuas, fastening, thiab sealing, uas ua rau muaj kev siv hluav taws xob tsawg thiab tsis muaj teeb meem overheating.

Nyob rau hauv sib piv, sab saum toj rauj laum rods feem ntau siv R-puab los yog T-shaped threads. Lub zog los ntawm hydraulic pob zeb laum yog kis los ntawm tus pas nrig mus rau lub laum me ntsis, ua rau lub zog loj poob thaum tshav kub ntawm cov xov sib txuas, nrog rau qhov kub thiab txias muaj peev xwm tshaj 400 ° C. Yog tias API tus qauv xov tau siv rau saum rauj rods, tsis tsuas yog lawv yuav tsis muaj txiaj ntsig ntawm kev xa xov hluav taws xob, tab sis lawv kuj tuaj yeem raug kev puas tsuaj los ntawm kev yaig, ua rau cov laum rods nyuaj rau disassemble thiab cuam tshuam rau kev tsim kho thiab nce nqi.

Nyob rau xyoo 1970 thiab 80s, kev tshawb fawb dav dav tau ua los ntawm cov kws tshaj lij txawv teb chaws ntawm cov xov siv rau saum rauj laum rods, xav txog yoj-puab, sib xyaw, thim rov qab serrated, FL, thiab trapezoidal threads. Nws tau xaus lus tias yoj-puab threads yog haum rau rods nrog diameters nyob rau hauv 38 hli, thaum trapezoidal threads yog tsim nyog rau rods nrog diameters ntawm 38 hli thiab 51 hli.

Nyob rau hauv lub xyoo pua 21st, nrog rau txoj kab uas hla ntawm sab saum toj rauj khoom thiab kev txiav txim siab ntawm xov hauv paus lub zog, ntau lub tuam txhab drilling cuab yeej tau qhia cov xov tshiab xws li SR, ST, thiab GT los ntawm kev tshawb fawb thiab kev loj hlob.

Nyob rau hauv cov ntsiab lus, thaum lub sij hawm lub pob zeb drilling txheej txheem, cov xov kev sib txuas nyob rau sab saum toj rauj laum rods yog ib qho ntawm cov thawj qhov chaw ntawm lub zog noj thiab yog ib qho tseem ceeb nyob rau hauv thaum ntxov laum pas nrig.

Raws li Buddhism qhia, "dependent origination is empty, and one should not cling to any single method." Nrog rau kev nce qib tsis tu ncua hauv kev tshawb fawb thiab thev naus laus zis, nws tsim nyog xav txog seb cov ntaub ntawv siv xov tam sim no yog qhov zoo tshaj plaws thiab kev daws teeb meem kawg rau kev sib txuas hauv kev lag luam hydraulic drilling.