دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: See cavings.

n pi: particles that fall off (are sloughed from) the wall of the wellbore. Compare cuttings.

n: The block dropping into the wellbore due to fluctuation of borehole face.

loose formation materials that falls into the wellbore.

rock fragments that spall or break off the wellbore walls. Usually found as fill in the hole.

v: 1. to remove with the bit the residual cement that normally remains in the lower section of casing and the wellbore after the casing has been cemented.2. to remove the settlings and cavings that are plugged inside a hollow fish (such as drill pipe) during a fishing operation.

drilling through the cement after a primary cement job as the hole is deepened.

n: a device used to remove settlings and cavings that are plugged inside a hollow fish (such as drill pipe) during a fishing operation. It consists of a body inside of which is a hexagonal kelly tipped with a junk mill. It is run on drill pipe to the top of the fish.