دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a crescent-shaped sand dune with a convex face upwind and a concave face downwind.

n: A kind of device. When downhole instrument is lifted through wellbore, the wall is scaned by impulsive sonar with dense spiral. The picture of wall can be produced by converting echo of TV screen. The picture can disclose split and cavern.

a sonic caliper, developed in the late 1960’s, which generated a sonar picture of the wellbore.

n: a condition in which the weight on a bit tooth has been so great that the tooth has dulled until its softer inner portion caves over the harder case area.

n: The tipping becomes blunt due to the teeth of cone bit suffers oversized load.

n: A kind of clay containing concave-convex rabdolith.

n: A form of borehole collapse.

n: the collapse of the walls of the wellbore.

n: A severe form of sloughing (See also Sloughing).