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: in pipeline construction, the means by which a river crossing stays on course. Frequently computerised, guidance systems may be based on information gathered by pendulums, which determine inclination;gyroprobes, which are sensitive to drift and bearing;and sonar. Lasers are also used to guide crossing.

n: an apparatus that detects the presence of an underwater object by sending out sonic or supersonic waves that are reflected back. to it by the object.