دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A kind of double core barrel drill. The top of inner barrel is hung by ball bearing. It is good for improvement of core recovery if inner barrel does not roll with outer barrel.

n: The ratio between the actual length of core and cored footage.

n: The method that sustaining piece of core to prevent core stuck and decrease erosion with local reversal circulation in order to improve core recovery when core drilling in hard and brittle formation.

n: the index including drilling speed,unit yardage cost,well devitation, core recovery,qualification rate of well cementation,production efficiency and so on ,used to idicate the drilling reslut-characters of a well,a rig or a facility qualitatively and qua

n: the degree of superior and inferior of the drilled wellbore ,mainly including the wellbore quality ,core recovery, cement job quality and complete quality

n: the take out cores length is equal to core run,that is a hundred percent yield.

n: refer tocore recovery