دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: drill pipe that is like conventional drill pipe except that it is manufactured with a thicker wall, which increases its weight and tensile strength. For example. five-inch lEU grade E75 standardweight drill pipe weighs 19.5 pounds per foot (29 kilograms per metre). while five- inch lEU grade E75 heavyweight drill pipe weighs 25.ro pounds per foot (38.4 kilograms per metre). Heavyweight drill pipe is placed in the top of the string to support a very long string of pipe. Heavyweight drill pipe may be used in the drill stem when high-tensile strength drill pipe is required hit high-grade steel cannot be used because of the highgrade steels susceptibility to hydrogen embrittlernent, which is a form of corrosion caused by hydrogen sulphide. Compare heavy- walled drill pipe.

n: thick -walled drill pipe used in directional drilling and placed between the drill collar and drill pipe.

n: the inclination of a ship or a floating offshore drilling rig to one side, caused by wind, waves, or shifting weights on board. Also called list.

the area of pay closest to the casing in a highly deviated well.

n: the CMC product with high degree of polymerization ,high molecular weight and viscosity ,mainly used as adhesion promoter

n: a large, hook-shaped device from which the swivel is suspended. It is designed to carry maximum loads ranging from 100 to 650 tons (90 to 590 tonnes) and turns on bearings HOOK in its supporting housing. A strong spring within the assembly cushions the weight of a stand (90 feet, about 27 metres) of driI1 pipe, thus permit- ting the pipe to be made up and broken out with less damage to the tool joint threads. Smaller hooks without the spring are used for handling tubing and sucker rods. See also .stand, swivel.

n: tha large component attached to the travelling block from which the drill stem is suspended via the swivel

n: an assembly of hook and pulley, which used to get up the weights.

n: the weight of the drill stem that is suspended from the hook.

n: The total force pulling down on the hook. This total force includes the weight of the drillstring in air, the drill collars and any ancillary equipment, reduced by any force that tends to reduce that weight. Some forces that might reduce the weight includ

the actual weight of a pipe string measured at the surface;affected by buoyancy, friction and other factors in the wellbore.

n: a packer equipped with friction blocks or drag springs and slips and designed so that rotation of the pipe unlatches the slips. The friction springs prevent the slips from turning with the pipe and assist in advancing the slips up a tapered sleeve to engage the wall of the outside pipe as weight is put on die packer. Also called a wall-hook packer. See packer.

abbr: heavy wall drill pipe. Hydrafrac n: the copyrighted name of a method of hydraulic fracturing for increasing productivity.

heavy weight drill pipe.

n pi: organic compounds of hydrogen and carbon whose densities, boiling points, and freezing points increase as their molecular weights increase. Although composed of only two elements, hydrocarbons exist in a variety of compounds, because of the strong affinity of die carbon atom for other atoms and for itself. The smallest molecules of hydrocarbons are gaseous;the largest are solids. Petroleum is a mixture of many different hydrocarbons.

n: the pressure that the fluid columniation weight produce.