دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

round trip time for a circulated fluid.

n: the cost per drilling footage whose expression is Ct=﹛Cb+Cr(Tr+Tc+Tb)﹜/H Cb-the bit cost,Cr- operating cost,Tr- round trip time,Tc-pipe connection time ,Tb-actual bit on bottom time,H-footage drilled,Ct-drilling cost

n: a index to react the drilling efficiency which can be expressed by the formula :drilling speed per run = (drill footage)/〔net drilling time+ round trip time〕

n: which have something to do with the time ,including actual bit on bottom time,round trip time,backreaming
and reaming time.,change bit time,change joint time.

n: The full time from trip out to trip in for changing bit or logging .