Emva kweminyaka engama-20 yemizamo, iTshayinaisitya se-oyileimveliso ukusuka ekuqaleni, ukusuka kwixabiso eliphantsi ukuya kwixabiso eliphezulu, ukusuka kwibakala eliphantsi lentsimbi ukuya kwiimveliso ze-API, kwaye emva koko kwiimveliso ezingezizo ze-API ezineemfuno ezikhethekileyo, ukusuka kubuninzi ukuya kumgangatho, zisondele kwinqanaba leoli yangaphandle kunye neemveliso ze-casing.Isabelo semalike yasekhaya yetyhubhu yequla le-oyile yaseTshayina igqithile kuma-80%, kwaye iye yaba yimveliso ethunyelwa ngaphandle iminyaka emininzi.

Ngokokusasazwa kwengingqi e-China, imfuno yeoli kunye ne-casing ayisagxininiswe kwingingqi esempuma.Ukusuka kumbono wophuhliso lwemimandla yeoli kunye negesi yasekhaya, uphuhliso lweDaqing, iLiaohe, iShengli kunye nezinye iindawo zeoyile zaseMpuma zijike kuphuhliso lweendawo zeoyile zaseNtshona ezifana neSichuan kunye neXinjiang, kuthathelwa ingqalelo indlela yemimandla yeoli engaselunxwemeni.Ukongeza, iya kukhula ukusuka emhlabeni ukuya elunxwemeni kwaye ukusuka kulwandle olungekho nzulu ukuya kulwandle olunzulu.Ukongezelela, ubunzulu bokugaya buba bunzulu kwaye bunzulu, kwaye umsebenzi wokugaya uya uba nzima ngakumbi, kwaye iimfuno zeoli kunye ne-casing kufuneka zibe phezulu kwaye ziphezulu.

Iindidi ezahlukeneyo ze-casing ezisetyenziselwa inkqubo yokuvelisa i-oyile: i-oyile ye-oyile engaphezulu - ukukhusela iqula ekungcolisweni ngamanzi angenasiphelo kunye ne-gas layers - ukuxhasa izixhobo ze-wellhead kunye nokugcina ubunzima bezinye iileyile ze-casing.I-oyile ye-oyile ye-Technical casing - yahlula uxinzelelo lwamacandelo ahlukeneyo, ukwenzela ukuba kuqinisekiswe ukujikeleza okuqhelekileyo kwe-quota ye-drilling fluid kunye nokukhusela i-casing yemveliso.-Ukuze ufake isixhobo anti ukugqabhuka, isixhobo ubungqina ukuvuza kunye liner equleni.I-oil casing - ioli kunye negesi zithuthwa ukusuka kwindawo yokugcina amanzi ngaphantsi komhlaba.-Isetyenziselwa ukukhusela iqula kunye nokwahlula udaka lokwemba.Kwimveliso ye-oyile ye-oyile, ububanzi bangaphandle ngokuqhelekileyo bu-114.3 mm ukuya kwi-508 mm.

Intloko yomthombo ikhuselwe ubunzima be-casing kumanzi angekho nzulu.

I-oyile ye-oyile ye-Technical casing - yahlula uxinzelelo lwamacandelo ahlukeneyo, ukwenzela ukuba kuqinisekiswe ukujikeleza okuqhelekileyo kwe-quota ye-drilling fluid kunye nokukhusela i-casing yemveliso.-Ukuze ufake isixhobo anti ukugqabhuka, isixhobo ubungqina ukuvuza kunye liner equleni.

I-oil casing - ioli kunye negesi zithuthwa ukusuka kwindawo yokugcina amanzi ngaphantsi komhlaba.-Isetyenziselwa ukukhusela iqula kunye nokwahlula udaka lokwemba.Kwimveliso ye-oyile ye-oyile, ububanzi bangaphandle ngokuqhelekileyo bu-114.3 mm ukuya kwi-508 mm.

Ngokutsho kwe-SY / t6194-96 "i-petroleum casing", i-oyile ye-oyile inokwahlulwa ibe yi-casing emifutshane kunye nokudibanisa kwayo kunye nentambo ende kunye nokudibanisa.