Concentric drilling thiab eccentric drilling yog ob txoj hauv kev sib txawv rau kev drilling uas koom nrog kev tso kawm ntawm cov khoom siv los yog cov casings txheeb ze rau ib leeg:
Concentric Drilling:
Nyob rau hauv concentric drilling, lub laum me ntsis thiab casing yog ua raws li tib lub hauv paus axis.
Lub laum me ntsis yog positioned nyob rau hauv lub casing los yog xyaum txoj hlua nyob rau hauv xws li ib txoj kev uas nws rotates concentrically (nyob ib ncig ntawm tib qhov chaw) nrog lub casing.
Qhov kev sib dhos no tso cai rau drilling ncaj qha los ntawm qhov nruab nrab ntawm lub casing, ua rau lub borehole nrog ib txoj kab uas hla.
Concentric drilling yog feem ntau siv nyob rau hauv ntau daim ntawv thov drilling, nrog rau cov dej zoo drilling, geotechnical drilling, thiab ntxhia tshawb nrhiav.
Eccentric Drilling:
Nyob rau hauv eccentric drilling, lub laum me ntsis yog offset los yog positioned eccentrically (nyob deb ntawm qhov chaw) nyob rau hauv lub casing los yog xyaum hlua.
Qhov kev tso kawm eccentric ntawm lub laum me ntsis tso cai rau kev tsim cov borehole txoj kab uas hla loj dua piv rau cov casing loj.
Eccentric drilling feem ntau yog siv nyob rau hauv daim ntawv thov qhov twg casing kev nce qib los yog borehole o yog xav tau, xws li nyob rau hauv overburden drilling los yog tej yam kev tsim kho zoo.
Eccentric drilling tuaj yeem xa mus rau kev siv eccentric laum khoom nrog cov qauv txiav tawm, uas tuaj yeem ua haujlwm hauv cov ntawv tshwj xeeb drilling kom ua tiav cov hom phiaj tshwj xeeb.
Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm concentric thiab eccentric drilling yog nyob rau hauv kev sib dhos ntawm lub laum me ntsis thiab casing txheeb ze rau ib leeg. Concentric drilling suav nrog kev ua kom lawv nyob rau tib lub hauv paus axis, thaum eccentric drilling cuam tshuam nrog kev ua haujlwm lossis tso cov laum me ntsis deb ntawm qhov nruab nrab ntawm lub casing lossis laum hlua.
