دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a erosion resistant covering or main pipe that is used when tubing is set deeper than the perforations or on the long string across from the upper perforations in a side-by-side completion.

n: the circulation head joined between the bottom of the short string and the bottom of the long string

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: 1. the last string of casing set in a well. 2. the string of casing that is set at the top of or through the producing zone, often called the oil string or production casing.

in a side-by-side dual completion, the tubing string that connects the deeper zone to the surface.

n: the final string of casing set in a well after the productive capacity of the formation has been determined to be sufficient. Also called the long string or production casing.

n: a casing elevator containing segmented slips with gripping teeth inside. Slip elevators are recommended for long strings of casing, because the teeth grip the casing and help prevent casing damage from the weight of long, heavy strings hanging from the elevators. Slip elevators may also be used as slips.

n: The slip that can retain homogeneously the pipe.