دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a plug that fits in the bore of a subsea tree to serve as the secondary barrier against reservoir pressure.

n: a valve installed above the kelly that can be closed manually to protect the rotary hose from high pressure that may exist in the drill stem.

n: The two position and two way valve located between the sub of swivel and the upper of kelly,which can seal the pressure of drill pipe when well blowout.

a valve at the top of the kelly that can be closed in the event of a inside tubing kick or high pressures.

n: The point is the highest position that the hoisting block can ascend,which prevent the hoisting block touching the crown block.

n: in tank sampling, a spot sample taken at the mid-point of the upper third of the tank contents, that is, at onesixth of the depth of liquid below the top surface.

n: any part of the drill stem, tubing string, or casing string that lies in the upper part of the borehole.

n: a category of oil production for purposes of price control. Upper tier refers to oil that comes from reservoirs that began producing subsequent to 1972. It also refers to oil produced from wells having a production rate of 10 barrels (1,590 litres) per day or less for a continuous period of 12 months. Also called stripper oil.