دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a partial restriction, generally a plate, placed to change the direction, guide the flow, or promote mixing within a tank or vessel. 2. a device that is seated on the bit pin, in a tool joint, or in a drill pipe float, to centralize the lower end of a go-devil while permitting the bypass of drilling fluid.

n: A replaceable metal ring inserted in the BHA (q.v.) to act as a landing collar for a survey tool.

n: a check valve installed in the drill stem that allows mud to be pumped down the drill stem but prevents flow back up the drill stem. Also called a float.

n: a non-return valve joined in the pipe , it can only let the fluid into the bottom of the well from the drill pipe but cant let the fluid return into the dill pipe from the bottom

n: a check valve in the drill string that will allow fluid to be pumped into the well but will prevent flow from entering the string.

n: refer todrill pipe float

n: 1. an element of a level-control assembly designed to operate while partially or completely submerged in a liquid the level of which is controlled by the assembly. The buoyancy of the liquid activates the float and the control valve to which it is linked and modifies the rate of the inflow or the outflow of the vessel to maintain a preset level. 2. a drill pipe float. 3. a long flat-bed semi-trailer. A float collar also prevents backflow of cement during a cementing operation.

n: see drill pipe float.

n: refer to”drill pipe flot“

the primary, bottom hole valve in the float collar or shoe that allow the casing to self fill while running and allows the cement to pass into the annulus but helps prevent cementing U-tubing after the job. Drillable and subject to erosion wear.

n: clack valve that valve orifice without hindrance after valve is opened.