hat
Diminye Sub ki itilize pou li konekte li forage kòd konpozan ki gen diferan diamètres ke manda a en chanjman nesesè pou akomode koneksyon ant diferan. Sub sa a gen pou itilize pou Liaison gwo OD forage zouti oubyen yon fil chenn conique sèvi ak machin.
eng
Reduced Sub is used to connect drilling string components that have different diameters that warrant the cross-sectional change necessary to accommodate different connections. This sub would be used to crossover large OD drilling tools or a tapered drill collar string.