Kupsinjika kwa API 5CTthumba la mafutam'chitsime cha mafuta: kuonetsetsa kuti choyikapo chimalowa m'chitsimecho chikupitirirabe, osati chosweka kapena chopunduka, chosungiracho chiyenera kukhala ndi mphamvu inayake, yokwanira kukana mphamvu yakunja yomwe imalandira. Choncho, m'pofunika kusanthula kupsinjika kwa mkati mwa chitsime chamkati.

1) Mphamvu yokoka
2) Extrusion mphamvu
3) Kupanikizika kwamkati
4) Mphamvu yopindika

Pomaliza, chotengera chomwe chili m'chitsime chimakhala ndi mphamvu zitatu zoyambirira. Kupanikizika kwa zigawo zosiyanasiyana kumakhala kosiyana, kumtunda kumalandira mphamvu yokoka, kumunsi kumakhala ndi mphamvu yakunja, ndipo gawo lapakati limalandira mphamvu zochepa zakunja. Popanga chingwe cha casing, kalasi yachitsulo ndi makulidwe a khoma la casing amasankhidwa malinga ndi zomwe zili pamwambazi za chitetezo. Kwa API standard casing, general security factor for tensile ndi 1.6-2.0, chitetezo champhamvu ndi 1.00-1.50, nthawi zambiri 1.125, chitetezo champhamvu chamkati ndi 1.0-1.33, ndipo chitetezo cha kukana kukanikiza pamalo opangira simenti ndi Mtengo wofunikira ndi 0.85. Tiyenera kutsindika kuti chitetezo pakupanga mphamvu ya chingwe cha casing chimasankhidwa mosamala malinga ndi dera, stratum ndi mafuta omwe amadza pambuyo pake ndi kupanga gasi. Iye ndi munthu wamatsenga. Chifukwa cha mphamvu zosiyanasiyana zakunja zomwe zimagwiritsidwa ntchito kumtunda, pakati ndi kumunsi kwa chingwe cha casing, chingwe cha casing chomwe chimapangidwira nthawi zambiri chimakhala chokulirapo kapena chochuluka chachitsulo pamakoma apamwamba ndi apansi, ndi zosiyana pakati, kotero ndikofunikira kuti muwerenge. bwalo. Mu chitsime ichi. Nthawi zambiri, chosungiracho chimagwira ntchito m'ma media owononga. Choncho, kuwonjezera pa kufunikira kwa mphamvu inayake yamagulu, chosungiracho chimafunika kuti chisindikize bwino komanso kuti chisawonongeke ndi dzimbiri.