دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the pressure maintained on equipment or systems through which a fluid flows 2. in reference to engines, a term used to describe the resistance to the flowof exhaust gas through the exhaust pipe. 3. the operating pressure level measured downstream from a measuring device4.

n: 1. a valve used to regulate back-pressure on equipment or systems through which a fluid flows. 2. a valve used to regulate automatically a uniform pressure on the inlet side of the valve.

n: the total pressure exerted in the wellbore by a column of fluid and any back-pressure imposed at the surface.

n: 1. the pressure at the bottom of a borehole. It is caused by the hydrostatic pressure of the wellbore fluid and, sometimes, by any back-pressure held at the surface, as when the well is shut in with blowout preventers. When mud is being circulated, bottomhole pressure is the hydrostatic pressure plus the remaining circulating pressure required to move the mud up the annulus. 2. the pressure in a well at a point opposite the producing formation, as recorded by a bottomhole pressure bomb.

n: The pressure at the bottom of the borehole, or at a point opposite the production formation.

n: a procedure whereby the formation immediately below the casing shoe is subjected to a pressure equal to the pressure expected to be exerted later by the drilling fluid or by the drilling fluid and the back-pressure created by a kick. See leakoff test.

a LOT or an FIT test (check specifics for details),a pressurized test after primary cementing to make sure the bottom most seal with the formation will handle pressures needed for drilling the rest of the well.

n: a panel or board on the rig floor, usually near the drillers position, that allows a person to remotely adjust the size of the opening of a choke installed in the choke manifold. By adjusting the chokes opening, the operator can increase or decrease the amount of back-pressure being held on the well by the choke. Usually, the panel also has pressure gauges and other instruments to help the operator control the well.

n: a cast-iron or magnesium drillable tool consisting of a packing assembly and a back-pressure valve. It is used to close off the annular space between tubing or drill pipe and casing to allow the placement of cement or fluid through the tubing or drill pipe at any predetermined point behind the casing or liner, around the shoe, or into the open hole around the shoe.

n: A kind of iron casting tool with drillability.