Casingyog qhov loj - txoj kab uas hla steel yeeb nkab siv rau hauv qhov drilling thiab ua tiav cov roj thiab cov qhov dej. Nws yog txo qis rau hauv qhov borehole los ntawm lub qhov drilling rig thiab ruaj ntseg rau cov phab ntsa tsim nrog cov cement los ua ib qho khoom siv ruaj khov ntawm lub qhov dej.
Hauv kev lag luam roj thiab roj, "casing" tuaj yeem muab faib ua peb txoj hauv kev tseem ceeb: los ntawm nwsmuaj nuj nqi (txoj hlua hom), by nwsqib khoom siv, thiab los ntawm nwskev sib txuas (xov hom).
Drilling hauv ib puag ncig qaub?Tiv tauj peb rau API 5CT L80 / C90 / T95 casing kev daws teeb meem uas ua raws li NACE MR0175.
Hom los ntawm Kev Ua Haujlwm (Lub Casing Strings)
Raws li lub qhov dej drilled, sib txawv "txoj hlua" ntawm casing yog ntsia rau ntawm qhov sib txawv qhov tob los ua lub luag haujlwm tshwj xeeb:
Conductor Casing:Thawj txoj hlua loj tshaj plaws. Nws tiv thaiv sab saum toj ntawm lub qhov dej los ntawm caving hauv (ntxuav) thiab coj cov dej ntws rov qab mus rau saum npoo.
Nto Casing:Tiv thaiv tshiab - dej aquifers los ntawm cov pa paug los ntawm cov roj los yog roj thiab muab lub hauv paus ruaj khov rau Blowout Preventer (BOP).
Intermediate Casing:Siv nyob rau hauv qhov tob tob kom cais "qhov teeb meem" (xws li siab - thaj chaw siab lossis pob zeb tsis ruaj khov) kom qhov drilling tuaj yeem txuas ntxiv mus rau qhov tob ntawm lub hom phiaj.
Production Casing:Txoj hlua kawg. Nws muab ib tug tshwj xeeb conduit rau cov roj thiab roj mus los ntawm lub reservoir mus rau saum npoo.
Liner:Ib hom casing uas tsis ncav cuag qhov chaw. Nws yog dai rau hauv qab ntawm ib txoj hlua casing yav dhau los kom txuag tau cov nqi thiab txo qhov hnyav ntawm txoj hlua.
Hom los ntawm Khoom Qib (API 5CT)
Casing tau muab faib ua "qib" raws li nws lub zog thiab kev tiv thaiv corrosion:
Qib General (J55, K55, N80):Siv hauv qhov dej ntiav lossis nruab nrab- qhov tob qhov twg cov xwm txheej tsis muaj corrosive heev.
Sour Service Qib (L80, C90, T95, C110):Tshwj xeeb tshaj yog cua sov- kho kom muaj kev tswj xyuas qhov nyuaj (Max 23 HRC rau L80). Cov no yog qhov tseem ceeb rau cov qhov dej uas muajHydrogen sulfide (H2S ).
Siab - Qib Siab (P110, Q125):Tsim los rau qhov tob heev thiab siab - qhov dej siab. Lawv tuaj yeem txhawb nqa qhov hnyav hnyav tab sis feem ntau tsis tiv taus H2S (kev pabcuam qaub).
Corrosion Resistant (L80-13Cr):Muaj Chromium siab los tiv thaivCov pa roj carbon dioxide (CO2)corrosion.
Hom los ntawm kev sib txuas (Tshooj Hom)
Cov kav dej yuav tsum tau screwed ua ke. Hom xov txiav txim siab qhov sib koom ua ke lub zog thiab foob:
STC (Short Threaded & Coupled):Qhov zoo tshaj plaws rau qhov ntiav, qis - cov ntawv thov nruj.
LTC (Long Threaded & Coupled):Feem ntau rau cov qauv nruab nrab- qhov tob ntsug qhov dej; muaj zog tensile zoo dua STC.
BTC (Butter Threaded & Coupled):Siab -strength trapezoidal threads tsim rau cov qhov dej tob thiab cov khoom hnyav.
Kev sib txuas hwm hwm:Cov xov uas muaj tswv (piv txwv li, VAM®, TenarisHydril) uas muab ahlau-rau- hlau foob. Cov no yog qhov yuav tsum tau ua rau siab -cov roj qhov dej siab kom ntseeg tau 100% roj- nruj nruj.
Table rau Kev Muag Khoom
| Qeb | Hom loj | Txoj Cai Xaiv |
| Muaj nuj nqi | Nto, nruab nrab, ntau lawm | Qhov tob tob & Kev tiv thaiv dej hauv av |
| Qib | J55, L80, P110 | Siab, Qhov tob & H2S Qib |
| Xov | STC, LTC, BTC, hwm | Tension Load & Gas-Tightness |
GNEE API Casing Pipe txheej txheem kab
GNEE API Oil Well Casing Pipe Test Equipments
GNEE API OCTG Casing daim ntawv pov thawj
FAQ
Range 3 casing yog dab tsi?
Ntau yam 3hais txog qhov tshwj xeebntevntawm ib qho kev sib koom ua ke ntawm casing raws li tau hais los ntawm tusAPI 5 CTtxheem.
Ntev:A Range 3 casing sib koom ua ke feem ntau ntsuas nruab nrab ntawm38 e45ft(kwv yees li 11.58 txog 13.72 meters).
Kev sib piv:Nws yog tus qauv ntev tshaj plaws (Range 1 yog qhov luv tshaj ntawm 16-25 ft; Range 2 yog qhov feem ntau ntawm 25-34 ft).
Qhov zoo:Siv Range 3 casing txo cov naj npawb ntawm kev sib txuas (screwing kav ua ke) xav tau kom ncav cuag lub hom phiaj qhov tob, uas txuag lub sijhawm thaum lub sijhawm teeb tsa thiab txo cov ntsiab lus xau.
Qhov tsis zoo:Lawv nyuaj rau kev thauj mus los thiab yuav tsum tau siab dua drilling rigs los tswj qhov siab ntxiv.
Dab tsi yog qhov txawv ntawm casing?
Casing qhov luaj li cas yog ntsuas los ntawm lawvSab nraud txoj kab uas hla (OD). Raws li API 5CT, ntau qhov ntau thiab tsawg los ntawm4-1/2 nti rau 20 nti. Nov yog qhov lawv feem ntau siv:
Me me (4-1/2 "mus rau 7"):Feem ntau siv raws liProduction Casinglos yogLinersrau ntu kawg ntawm qhov dej uas muaj roj thiab roj ntws.
Nruab nrab (7-5/8 "mus rau 10-3/4"):Feem ntau siv raws liIntermediate Casingcais tawm cov teeb meem teeb meem lossis siab - thaj chaw siab.
Loj (13-3 / 8 "mus rau 20"):Feem ntau siv raws liNto Casinglos yogConductor Casinglos tiv thaiv cov khaubncaws sab nraud povtseg thiab txhawb nqa lub qhov dej saum toj kawg nkaus.
