دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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 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.

n: any logging device whose operation depends on a portion of the logging tool touching the wellbore.

n: The bottom of the wellbore.

n: A cementing tool used to clean the drilling fluid in the wellface and prevent drilling fluid invading cement slurry. Installed in the cement casing head and threw into the wellbore before cementing.

n: The phenomenon that the cuttings accumulate in the wellbore because flushing cannt clean the wellbore timely in the drilling programe. It is one of the most important affecting factor of bit penetration.

n: the lowest or deepest part of a well. adj: pertaining to the bottom of the wellbore.

n: 1. the pressure at the bottom of a borehole. It is caused by the hydrostatic pressure of the wellbore fluid and, sometimes, by any back-pressure held at the surface, as when the well is shut in with blowout preventers. When mud is being circulated, bottomhole pressure is the hydrostatic pressure plus the remaining circulating pressure required to move the mud up the annulus. 2. the pressure in a well at a point opposite the producing formation, as recorded by a bottomhole pressure bomb.

n: The pressure at the bottom of the borehole, or at a point opposite the production formation.

n: a complete trip from the bottom of the wellbore to the top.

n: The process that the drilling fluid returns to the well head from the bottom hole.

circulating the bottom hole fluid to the top of the well.