دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (A C) current in which the charge-flow periodically reverses and whose average value is zero. Compare direct current.

n: The current whose intensity and direction alter periodically with time.

the reciprocal of resistance in direct current logging measurements. Measured in siemens (formerly mhos).

n: a device for changing alternating current to direct current or vice versa;usually, if the device changes AC to DC, it is called a rectifier.

abbr: I. direct current. 2. drill collar;used in drilling reports.

depth correction.

n: The drill rig whose drawworks, rotary table and drilling pump are driven by direct current motor. The direct current motor is driven by diesel engine or gas turbine.

n: (DC) electric current that flows in only one direction. Compare alternating current.

n: the direct current motor used to drive the reel ,harp ,swivel and drilling pump

n: the value of an AC current or voltage that produces the same heating effect as a direct current of the same amount;equal to 0.707 times the maximum value. Electrical measuring devices read effective values unless otherwise indicated. Also called RMS value.

n: the conversion to direct current of both the negative and the positive pulsations of alternating current.

n: a method that testes drilling pipe. Using high energy pulse direct current dielectric flux magnetic drilling pipe, then test pipe surface magnetic flux chaos beause of endurance crack, scar and other physical or constructional changing .