دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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 logging method that records drift angle, or deflection from the vertical, and direction of the drift. A singleshot directional-survey instrument makes a single photograph of a compass reading of the drift direction and the number of degrees the hole is off vertical. A multi shot survey instrument obtains numerous readings in the hole as the device is pulled out of the well. See directional drilling.

n: A method of measuring the inclination and direction of the wellbore by using a downhole instrument. The well must be surveyed at regular intervals to plot its course accurately.

a measurement of the well path that records the inclination and azimuth of the wellbore using a compass or other device.

n: the devices used to measure and record the downhole layer ,fluid property,state of the wellbore and some parameters relational with drilling