Casingndizofunikira pazida zobowolera mafuta, ndipo zida zake zazikulu zimaphatikizapo kubowola, chitoliro chapakati ndi posungira, makola obowola ndikubowola chitoliro chaching'ono chachitsulo ndi zina zotero.

Chosungiracho chimagwiritsidwa ntchito pothandizira khoma la mafuta ndi gasi la chitoliro, kuonetsetsa kuti kubowola ndi kutsiriza ntchito yachizolowezi cha zitsime.Malinga ndi pobowola aliyense chitsime kuya ndi geological zinthu, ntchito angapo zigawo casing.Casing cementing kupita pansi pambuyo ntchito ndi chubu, kubowola chitoliro ndi osiyana, sangathe kugwiritsidwanso ntchito, nthawi imodzi consumable zipangizo.Chifukwa chake, kugwiritsidwa ntchito konse kwa casing ndi 70% ya chitoliro chamafuta.Casing ikhoza kugawidwa molingana ndi ntchito: catheter, pamwamba casing, casing ndi kupanga casing.Casing ndi chitoliro cham'mimba mwake waukulu, sewerani zitsime zamafuta ndi gasi, kapena chitsime cha khoma.Chosungiracho chimayikidwa mu dzenje la chitsime, chokhazikika ndi simenti kuti zisapangike komanso kuti dzenje lotalikirana liwonongeke komanso kuonetsetsa kuti matope obowola amayenda mozungulira pobowola.

Casing imagwiritsidwa ntchito kwambiri pobowola zitsime zamafuta pobowola komanso mukamaliza khoma lothandizira kuti zitsimikizire kuti pobowola ndikumaliza zitsime pambuyo pa ntchito yokhazikika yamafuta.OCTG makamaka amagwiritsidwa ntchito pobowola mafuta ndi gasi komanso kuyendetsa mafuta ndi gasi.Zimaphatikizapo chitoliro chobowola mafuta, chotengera chamafuta, machubu a pampu.Mapaipi obowola mafuta amagwiritsidwa ntchito makamaka kulumikiza kolala yobowola ndi kubowola ndikudutsa mphamvu yobowola.Casing imagwiritsidwa ntchito makamaka pobowola ndikumaliza khoma loyenera la chithandizo, kuonetsetsa kuti machitidwe ndi kumaliza ntchito yobowola pambuyo pa ntchito yabwino ya zitsime.Kupopa zitsime pansi pa chubu makamaka mafuta, gasi kutumizidwa pansi.Casing ndi kusunga zitsime zikuyenda bwino.Monga zinthu zosiyanasiyana geological, mobisa zovuta maganizo boma, kukoka, kukanikiza, kupinda, torsional maganizo kuchita pa ophatikizana zotsatira za chubu, amene casing palokha, khalidwe la zofunika apamwamba.Chosungiracho chikawonongeka pazifukwa zina, chingayambitse zitsime zonse zopangira, kapena kuchotsedwa.