Chitoliro chamafuta apadera chimagwiritsidwa ntchito kwambiri pobowola chitsime chamafuta ndi gasi komanso kufalitsa mafuta ndi gasi. Zimaphatikizapo chitoliro chobowola mafuta, chotengera chamafuta ndi chitoliro chopopera mafuta. Chitoliro chobowola mafuta chimagwiritsidwa ntchito kulumikiza kolala yobowola ndi pobowola ndikusamutsa mphamvu yobowola. Chophimba chamafuta chimagwiritsidwa ntchito kuthandizira khoma la chitsime pobowola komanso mukamaliza, kuti awonetsetse momwe kubowola ndikugwirira ntchito kwachitsime chonse mukamaliza. Chitoliro chopopera makamaka chimasamutsa mafuta ndi gasi kuchokera pansi pa chitsime kupita pamwamba.

Chophimba cha mafutandiye njira yopulumutsira chitsime cha mafuta. Chifukwa cha mikhalidwe yosiyanasiyana ya geological, kupsinjika kwapansi panthaka kumakhala kovuta, kolimba, kopindika, kupindika ndi kupsinjika kwapaipi, zomwe zimayika patsogolo zofunikira pamtundu wa casing wokha. Ngati chosungiracho chokha chawonongeka pazifukwa zina, chitsime chonsecho chikhoza kuchepetsedwa kupanga kapena kusiyidwa.

Malinga ndi mphamvu ya zitsulo palokha, casing akhoza kugawidwa m'magulu osiyanasiyana zitsulo, kutanthauzaj55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Osiyana bwino zinthu, bwino kuya, ntchito kalasi zitsulo ndi osiyana. Choyikacho chokhacho chimafunikanso kuti chisawonongeke ndi dzimbiri m'malo owononga. M'malo ovuta a geological mikhalidwe, casing imafunikanso kuti ikhale ndi mphamvu yokana kugwa.