Forward Circulation (tseem hu ua Conventional Circulation) thiab Reverse Circulation yog ob txoj hauv kev ntawm drilling siv nyob rau hauv ntau yam lag luam, txhua tus muaj cov txheej txheem sib txawv thiab kev siv. Nov yog qhov sib piv ntawm ob:
Forward Circulation:
Txoj kev Drilling:Nyob rau hauv pem hauv ntej ncig drilling, cov kua drilling (feem ntau av nkos los yog dej) yog pumped los ntawm lub laum yeeb nkab thiab tawm los ntawm nozzles los yog qhib nyob rau hauv lub laum ntsis. Cov kua dej tom qab ntawd rov qab mus rau qhov chaw annular ntawm cov yeeb nkab laum thiab cov phab ntsa borehole, nqa cov txiav nrog nws.
Kev tshem tawm Cuttings:Cuttings yog nqa mus rau saum npoo los ntawm qhov chaw annular ntawm lub laum yeeb nkab thiab phab ntsa borehole. Lub drilling kua viscosity pab txhawb nqa cov txiav mus rau saum npoo, qhov chaw uas lawv tau sib cais los ntawm cov av nkos, thiab cov av nkos rov qab.
Daim ntawv thov:Forward circulation drilling yog feem ntau siv nyob rau hauv ntau yam kev siv drilling, suav nrog roj thiab roj drilling, dej zoo drilling, thiab kev tshawb nrhiav geotechnical. Nws yog ntau yam thiab yuav siv tau nyob rau hauv ntau yam ntawm geological formations.
Rov qab Circulation:
Txoj kev Drilling:Nyob rau hauv rov qab ncig drilling, cov dej drilling yog pumped los ntawm cov yeeb nkab laum thiab tawm los ntawm qhov qhib hauv qhov laum me ntsis. Cov kua dej tom qab ntawd rov qab mus rau qhov chaw ntawm lub laum yeeb nkab, nqa cov txiav nrog nws. Ntawm qhov chaw, cov kua dej drilling thiab cov txiav tau muab sau rau hauv cov qauv chav ua ntej cov kua lim thiab rov ua dua.
Kev tshem tawm Cuttings:Cuttings yog nqa los ntawm qhov chaw ntawm lub laum yeeb nkab, muab ib tug ntau npaum thiab txhim khu kev qha txoj kev ntawm kev sau cov qauv zoo. Rov qab ncig yog feem ntau nyiam nyob rau hauv kev tshawb nrhiav ntxhia thiab qib tswj kev drilling vim nws txo qis cov qauv paug.
Daim ntawv thov:Rov qab ncig drilling yog dav siv hauv kev tshawb nrhiav pob zeb, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas cov qauv zoo yog qhov tseem ceeb. Nws muaj txiaj ntsig zoo hauv softer formations thiab paub txog kev muab cov qauv raug rau kev tsom xam geological.
Qhov txawv tseem ceeb:
Cuttings Txoj Kev:Nyob rau hauv pem hauv ntej ncig, cuttings mus txog qhov chaw annular ntawm lub laum yeeb nkab thiab lub borehole phab ntsa. Nyob rau hauv rov qab ncig, cuttings yog sau los ntawm qhov chaw ntawm lub laum yeeb nkab, kom ntseeg tau siab dua cov qauv zoo thiab tsis muaj paug.
Qauv Zoo:Rov qab ncig drilling muab cov qauv zoo dua piv rau kev xa mus tom ntej. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv kev tshawb nrhiav ntxhia qhov twg cov qauv ntawm cov qauv yog qhov tseem ceeb rau kev tshuaj xyuas.
Versatility:Kev xa mus rau pem hauv ntej yog ntau yam thiab tuaj yeem siv rau hauv ntau hom kev tsim geological. Rov qab ncig yog tshwj xeeb tshaj yog zoo nyob rau hauv softer formations thiab yog tshwj xeeb rau cov kev siv uas cov qauv zoo yog qhov tseem ceeb.
