دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

allowable annular surface pressure.

n: pressure expected to be measured at the surface after a well is drilled and completed.

a conditional surface pressure barrier often consisting of a set of hydraulically operated rams containing equipment designed to grip pipe, seal around pipe, shear off pipe or seal an open hole during drilling or a workover. It may also contain an annular

n: The surface pressure after well off. It is the static pressure bwtween casing and drill pipe or casing and reservoir. Reservoir pressure can be computed by casing head pressure.

n: the ratio between the pressure in the hole and the operating-piston pressure needed to close the rams of a blowout preventer.

n: The ratio between subsurface pressure and working hydraulic pressure which closing BOP rams requires.

the ratio between the pressure in the hole and the operating-piston pressure needed to close the rams on a given BOP design against a particular well head pressure.

n: the most important function of drilling fluids inrotary drilling is to bring cuttings from bottom of the hole to the surface. Some other important functions are :control subsurface pressures, cool and lubricate the bit and drilling string, deposition of a

maximum allowable annular surface pressure.

abbr: maximum allowable surface pressure.

maximum allowable surface pressure.

n: the maximum permitted annular pressure during the well controll.

n: (MASP) the maximum amount of pressure that is allowed to appear on the casing pressure gauge during a well-killing operation. This pressure is often determined by a leak-off test and if exceeded can lead to formation fracture at the casing shoe and a subsequent underground blowout or broaching.