Ingcindezi ku-API 5CTisikhwama samafuthaemthonjeni wamafutha: ukuqinisekisa ukuthi i-casing egijima emthonjeni iyaqhubeka, ayiqhekeki noma ikhubazekile, i-casing iyadingeka ukuze ibe namandla athile, okwanele ukumelana namandla angaphandle ayitholayo. Ngakho-ke, kuyadingeka ukuhlaziya ukucindezeleka emgodini wangaphakathi womthombo.

1) Amandla okudonsa
2) Amandla okukhipha
3) Ingcindezi yangaphakathi
4) Amandla okugoba

Sengiphetha, igobolondo elisemthonjeni liphethe amandla amathathu okuqala. Izimo zokucindezeleka zezingxenye ezihlukahlukene zihlukile, ingxenye engaphezulu ithola amandla okudonsa, ingxenye engezansi inamandla okucindezela angaphandle, kanti ingxenye ephakathi ithola amandla amancane angaphandle. Lapho uklama intambo ye-casing, ibanga lensimbi nokuqina kodonga lwe-casing kukhethwa ngokusekelwe ekucatshangelweni okungenhla kwesici sokuphepha. Ebhokisini elijwayelekile le-API, isici esijwayelekile sokuphepha se-tensile ngu-1.6-2.0, isici sokuphepha sokumelana nomthelela ngu-1.00-1.50, ngokuvamile u-1.125, isici sokuphepha sokucindezela kwangaphakathi ngu-1.0-1.33, futhi isici sokuphepha sokumelana nokucindezela endaweni yomjovo usimende Inani elifiselekayo lingu-0.85. Kufanele kugcizelelwe ukuthi isici sokuphepha ekwakhiweni kwamandla ezintambo ze-casing sikhethwe ngokucophelela ngokusho kwesifunda, i-stratum kanye nokukhishwa kwamafutha kamuva kanye nenqubo yokukhiqiza igesi. Ungumuntu obonakalayo. Ngenxa yamandla angaphandle ahlukene asetshenziswa ezingxenyeni ezingenhla, ezimaphakathi nezingaphansi zentambo ye-casing, intambo ye-casing eklanyelwe ivame ukuba amamaki ensimbi aminyene noma ngaphezulu ezindongeni ezingenhla neziphansi, futhi ngokuphambene phakathi, ngakho-ke kuyadingeka ukubala isikhwama. Kuleli qula. Ezimweni eziningi, i-casing isebenza kumidiya ebolayo. Ngakho-ke, ngaphezu kokudinga izinga elithile lamandla ahlangene, i-casing iyadingeka ukuze ibe nokusebenza kahle kokuvala futhi imelane nokugqwala.