دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Usually refers to the operation that ogging device measures deviation angle and azimuth. There are two types: single-shot survey and multimetering.

n: a hole under a road, railroad, stream, or other obstacle under which a pipeline must cross. It is created by using an auger or other type of drill.

n: an effect that occurs when certain shale zones are penetrated by the wellbore and the pressure exerted by the drilling mud exceeds the pressure exerted by the shale. The pressure differential causes the borehole to flex, or balloon, and the borehole no longer behaves as a fixed, rigid cylinder.

a log that measures the interval transit time for a compression wave to move a unit of distance, usually one foot.

n: The diameter of the drilled wellbore. The borehole diameter can change greatly even the same bit due to the change of formation lithology and formation collapse.

n: false influence on well logging measurement caused by the borehole environment, e.g., diameter, shape, rugosity, type of fluid, or mud cake.

n: The distortion of borehole log due to the change of diameter and shape of wellbore or drilling fludi invasion.

n: The record curve of formation parameter which changes with hole depth. It is measured by logging device.

n: the total pressure exerted in the wellbore by a column of fluid and any back-pressure imposed at the surface.

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.