دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the portion of the drilling assembly below the drill pipe. It can be very simple - composed of only the bit and drill collars - or it can be very complex and made up of several drilling tools.

n: in pipeline construction, the lead component in a directional drilling assembly. A circular steel band ringed with conical cutting teeth, the cutterhead does the actual boring of the hole for the pipeline under the waterway being crossed. Also called fly cutter.

n: The entire drilling assembly from the swivel to the collars, stabilisers, shock absorbers and reamers. Used to rotate the bit and to carry the mud or circulating fluid to the bit.

n: the tool assebly affecting the rock breaking,composed with the bit,drilling pipe,movable circle,

n: refer to drilling assembly inspection

n: the trade name for a directional drilling tool that deflects the drilling assembly off vertical without having to be pulled from the hole. The device that causes the tool to be deflected can be caught and retrieved with a wireline.

n: the smaller of the side fittings on a bell nipple, used to fill the hole when drill pipe is being removed from the well.

n: The line through which fluid is added to the annulus to maintain the fluid level in the well bore during the extraction of the drilling assembly.

n: The line through which fluid is added to the annulus to maintain the fluid level in the well bore during the extraction of the drilling assembly.

n: a walled round hole or well in the hull of a drill ship, ship-shape barge, or semisubmersible drilling rig (usually in the centre) through which the drilling assembly and other assemblies pass while a well is being drilled, completed, or abandoned.

an open shaft in a deep-sea drilling vessel, usually located in the center of the hull, through which the drilling takes place.

n: see packed-hole assembly.

n: 见packed-hole assembly