دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

to separate the stands into single joints.

n: in crane operations, the amount of load that causes a wire rope or a sling to fail. Also called actual strength. Compare minimum acceptance strength. nominal strength.

n: The minimum stress when the material fractures in tensile, compressional or cutting condition.

n: a heavy plate that fits in the rotary table and holds the drill bit while it is being unscrewed from the drill collar. See bit breaker.

n: See bit breaker.

n: a device attached to the catshaft of the drawworks that is used as a power source for unscrewing drill pipe;usually located opposite the drillers side of the drawworks. See cathead.

n: The self-releasing cathead installed in the cat shaft of drawworks.

n pi: tongs that are used to start unscrewing one section of pipe from another section, especially drill pipe coming out of the hole. Compare makeup tongs. See also tongs.

n: See tong.

n: The explosive made by powder chamber, detector and adherent wire. Usually matched with free joint indicator.

n: the change in the chemistry of a mud from one type to another. Also called conversion.

a flood front breaking through into a producing well.

v: to move with a slight, irregular rhythm. Breathing occurs in tanks of vessels when vapours are expelled and air is taken in. For example, a tank of crude oil expands because of the rise in temperature during the day and contracts as it cools at night, expelling vapours as it expands and taking in air as it contracts. Tubing breathes when it moves up and down in sequence with a sucker rod pump.