Casing tube max mpụta dayameta 115-350mm ODEX ịkụ ala ibe n'ibe eccentric karịrị ibu casing usoro maka miri mmiri olulu mmiri.

Nzọụkwụ na-arụ ọrụ: 1.Sistemụ ogbunigwe karịrị akarị bụ hama DTH, eccentric haziri reaming na pilot bit, ngwaọrụ nduzi na casing.The eccentric bit reaming na-atụgharị n'èzí iji gwuo oghere ka ukwuu iji mee ka mkpuchi ígwè banye n'olulu ahụ n'otu oge.A na-esi n'oghere ahụ wụpụ uzuzu nkume site na ọkpọkọ.2.Mgbe e gwuchara ya na omimi nke a kapịrị ọnụ, a ga-atụgharị reamer site n'ịtụgharị ntụzịaka ntụgharị ma ọ bụ site na ịdọrọ ngwá ọrụ ahụ, na ọ bụ oge a ga-ewepụ ngwá ọrụ egwu.3.Na-ebuli ihe mkpuchi ahụ ma ka ọ dị ugbu a na-ejuputa ihe ma ọ bụ ihe ndị ọzọ n'okpuru oghere.4.Iji obere mkpọpu ihe nkịtị nwere ike ịga n'ihu na-egwupụta oghere ahụ, ebe DTH bit nwere ike igwu omimi nke achọrọ.