دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

. See keyseat. key valve n: see shutoff valve.

annular access valve.

a pore pressure higher than a column of sea water for that true vertical depth.

n: a system consisting of a beacon positioned on the seafloor to transmit an acoustic signal, a set of three or four hydrophones mounted on the hull of a floating offshore drilling vessel to receive the signal, and a position display unit to track the relative positions of the rig and the drill site. Monitoring of the display unit aids in accurate positioning of the rig over the site.

n: a choke in which the position of a conical needle, sleeve, or plate may be changed with respect to their seat to vary the rate of flow;may be manual or automatic. See choke.

n: A choke in which a conical needle and seat vary the rate of flow.

a pressure step-reduction choke that can be changed while actively flowing the well.

n: a fog caused by the movement of warm, moist air over a surface with a temperature less than the dew point of the air. Also called sea fog.

a high temperature seal elastomer.

anchor handling vessel.

n: the distance from the normal level of the sea surface to the bottom of the hull or base of an offshore drilling platform or rig.

n: The distance from normal sea level to drill platform when marine drilling.

the clearance between the highest water surface that occurs during the extreme environmental conditions and the underside of the deck.

n: a body of air that remains for an extended period of time over a large land or sea area with uniform heating and cooling properties. The air mass will acquire characteristics (such as temperature and moisture content) of the underlying region.