Uxinzelelo kwi-API 5CTisitya se-oyilekwiqula leoli: ukuqinisekisa ukuba i-casing egijima emthonjeni iyaqhubeka, ayiqhekekanga okanye iphazamisekile, i-casing iyadingeka ukuba ibe namandla athile, okwaneleyo ukumelana namandla angaphandle ayifumanayo. Ngoko ke, kuyimfuneko ukuhlalutya uxinzelelo kwi-internal well casing.

1) Ukutsala amandla
2) Amandla okukhutshwa
3) Uxinzelelo lwangaphakathi
4) Ukugoba amandla

Ukuqukumbela, i-casing equleni ithwala amandla amathathu okuqala. Iimeko zoxinzelelo lwamalungu ahlukeneyo zihlukile, indawo ephezulu ifumana amandla okutsala, indawo engezantsi inamandla ocinezelo angaphandle, kwaye indawo ephakathi ifumana amandla angaphantsi angaphandle. Xa uqulunqa umtya we-casing, ibakala lensimbi kunye nobukhulu bodonga lwe-casing lukhethwa ngokusekelwe kwingqwalasela engentla yokhuseleko. Kwi-API esemgangathweni ye-casing, i-general security factor for tensile yi-1.6-2.0, into ekhuselekileyo yokumelana nempembelelo yi-1.00-1.50, ngokubanzi i-1.125, i-factor yokhuseleko yoxinzelelo lwangaphakathi yi-1.0-1.33, kunye nokhuseleko lokumelana noxinzelelo. kwindawo yokutofa kwesamente yi Ixabiso elinqwenelekayo yi-0.85. Kufuneka kugxininiswe ukuba inkalo yokhuseleko kuyilo lwamandla entambo ye-casing ikhethwe ngononophelo ngokwengingqi, i-stratum kunye ne-oyile kamva kunye nenkqubo yokuvelisa igesi. Ungumntu onamava. Ngenxa yamandla angaphandle ahlukeneyo asetyenziswa kwiindawo eziphezulu, eziphakathi nasezantsi zomtya we-casing, i-casing string eyilelwe idla ngokutyeba okanye ngaphezulu kweentsimbi zentsimbi kwiindonga ezingaphezulu nezisezantsi, kwaye zichasene phakathi, ngoko kuyimfuneko ukuba inani ingxowa. Ungene kweli qula. Kwiimeko ezininzi, i-casing isebenza kwimithombo yeendaba ezonakalisayo. Ngoko ke, ngaphezu kokufuna iqondo elithile lamandla adibeneyo, i-casing iyadingeka ukuba ibe nokusebenza kakuhle kokutywinwa kunye nokumelana nokubola.