دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see air-cooled exchanger. aerial river crossing n: a river crossing technique in which a pipeline is either suspended by cables over a waterway or attached to the girders of a bridge designed to carry vehicular traffic.

ring compound materials in the oil composed of carbon, hydrogen, sulfur, nickel and other trace materials. Asphaltenes are mostly very small platelets (35 A) suspended by micelles of maltenes and resins and carried through the oil. They precipitate by agg

n pi: a device, operated by air or hydraulic fluid, that fits into the opening in the rotary table when the drill stem must be suspended in the wellbore (as when a connection or trip is being made). Automatic slips, also called power slips, eliminate the need for roughnecks to set and take out slips manually. See slips.

n: A tool operated by pneumatics or hydraulic pressure.Used for chafing the drill stem when pipe connection or tripping.

n pl: the tongs latched on the drill pipe joint hanging in the totary by the slips, used to keep the pipe from turning as the makeup or breakout tongs (the lead tongs) apply torque to make up or break out the tightened tool joint connection. Compare lead tongs.

n: A tong suspended in the derrick, normally on the drillers right, used to hold box end of the tool joint while the pin end is loosened and unscrewed. Also called a make-up tong, as it is moved to pin end to tighten the joint to the recommended torque after

n: the gravel and coarse sand that are rolled and bounced along the bottom of a flowing stream. Compare dissolved load, suspended load.

the sediment that moves slowly along the bottom of a river channel.

n: The mechanism which is used to brake cylinder controlled by the load of RIH. It achieves the goal of bit load controlling, drill tool feeding, running speed controlling and drill tool suspending. Consisted by brake and assist brake.

irregular motion of colloidal sized particles when suspended in a fluid. The effect in simplest terms is caused by thermal driven motions.

n: the random movement exhibited by microscopic particles when suspended in liquids or gases. It is caused by the impact of molecules of fluid surrounding the particle.

n: The uninterrupted and aberrant movement of the particle suspending in the liquid or gas. Found by English Brown in 1827. The higher the temperature, the acuter the movement.

n: a form of electric submersible pumping for artificial lift, in which the pump can be run or pulled on the power cable. This type of pump installation is made possible by power cables designed for tensile loads in excess of 100,000 pounds (45,360 kilo- grams).

n: a sucker rod pumping unit. not commonly used. that employs cable wound around a spool. one end going into the hole. the other with a suspended counterweight. This type of unit can achieve 40- to SO-foot ( 12- to 24- metre) stroke lengths. reducing dynamic loads, rod reversals. gas locking. and power usage and can be applied to deep pump applications