Pambuyo pazaka pafupifupi 20 zoyesayesa, Chinathumba la mafutakupanga kuyambira pachimake, kuchokera pamtengo wotsika mpaka pamtengo wapamwamba, kuchokera ku chitsulo chotsika kupita kuzinthu zotsatizana za API, kenako kupita kuzinthu zopanda API zokhala ndi zofunikira zapadera, kuchokera kuchulukidwe mpaka kumtundu, zili pafupi ndi kuchuluka kwamafuta akunja ndi zinthu za casing.Gawo la msika wapakhomo la chubu lachitsime chamafuta ku China lapitilira 80%, ndipo lakhala chinthu chogulitsa kunja kwazaka zambiri.

Malinga ndi kugawa kwachigawo ku China, kufunikira kwa mafuta ndi casing sikulinso kudera lakum'mawa.Kuchokera pamalingaliro akukula kwa minda yamafuta ndi gasi, chitukuko cha Daqing, Liaohe, Shengli ndi madera ena akum'mawa atembenukira kukukula kwa madera akumadzulo monga Sichuan ndi Xinjiang, kulabadira momwe minda yamafuta akunyanja.Kuphatikiza apo, idzakula kuchokera kumtunda kupita ku gombe komanso kuchokera kunyanja yozama kupita kunyanja yakuya.Kuonjezera apo, kuya kwa kubowola kukukulirakulira, ndipo ntchito yobowola ikukhala yovuta kwambiri, ndipo zofunikira za mafuta ndi casing ziyenera kukhala zowonjezereka.

Mitundu yosiyanasiyana ya casing yomwe imagwiritsidwa ntchito popanga mafuta: mafuta opangira mafuta pamwamba - kuteteza chitsime kuti chisaipitsidwe ndi madzi osaya ndi magawo a gasi - kuthandizira zida zamutu ndi kusunga kulemera kwa zigawo zina za casing.Makina opangira mafuta aukadaulo - alekanitse kukakamizidwa kwa zigawo zosiyanasiyana, kuti mutsimikizire kufalikira kwamadzi obowola ndikuteteza chosungiracho.-Kuti muyike chipangizo choletsa kuphulika, chipangizo chotsimikizira kutayikira ndi liner pachitsime.Chophimba chamafuta - mafuta ndi gasi amatengedwa kuchokera pansi pamadzi.-Amagwiritsidwa ntchito poteteza chitsime komanso kulekanitsa matope obowola.Popanga posungira mafuta, m'mimba mwake nthawi zambiri amakhala 114.3 mm mpaka 508 mm.

Mutu wa chitsime umatetezedwa ndi kulemera kwa casing m'madzi osaya.

Makina opangira mafuta aukadaulo - alekanitse kukakamizidwa kwa zigawo zosiyanasiyana, kuti mutsimikizire kufalikira kwamadzi obowola ndikuteteza chosungiracho.-Kuti muyike chipangizo choletsa kuphulika, chipangizo chotsimikizira kutayikira ndi liner pachitsime.

Chophimba chamafuta - mafuta ndi gasi amatengedwa kuchokera pansi pamadzi.-Amagwiritsidwa ntchito poteteza chitsime komanso kulekanitsa matope obowola.Popanga posungira mafuta, m'mimba mwake nthawi zambiri amakhala 114.3 mm mpaka 508 mm.

Malinga ndi SY / t6194-96 "petroleum casing", chotengera chamafuta chimatha kugawidwa m'chikwama chachifupi cha ulusi ndi kulumikizana kwake ndi ulusi wautali ndi kulumikizana.