دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The weight of derrick that has not been fixed and repacked.

n: The total weight of derrick mask that has been fixed and refited.

n: the isotope of the element hydrogen that has one neutron and one proton in the nucleus;atomic weight is 2.0144.

n: The weight of natural diamond in diamond bit. Computed by carat.

n: a device installed near the bottom of the casing. It has a valve that keeps mud out of the casing so that the casing can be floated into the hole to lessen the weight on the rigs equipment This valve will, however, automatically open to let mud into the casing when the pressure of the mud outside the casing becomes high enough to collapse the joints of casing near the bottom of the string. Thus, this special collar, with its pressure-sensitive valve, not only allows casing to float, but also keeps it from collapsing.

n: a condition in which the drill stem becomes stuck against the wall of the wellbore because part of the drill stem (usually the drill collars) has become embedded in the filter cake. Necessary conditions for differential-pressure sticking, or wall sticking, are a permeable formation and a pressure differential across a nearly impermeable filter cake and drill stem. Also called wall sticking. See differential pressure, filter cake.

n: One of the mechanisms causing stuck pipe by having excessive mud weight.

a common method of pipe sticking where the overbalance pressure in the wellbore pushes the tubing against the side of the wellbore in a permeable formation.

n: a European term for the point on the bottom of a container that the dip weight touches during gauging and from which the measurement of the oil and water depths are taken. The dip point usually corresponds with the datum point, but any difference in levels must be designated in the calibration table.

n: a European term for a plumb bob that is attached to a metal dip tape and that is of sufficient weight to keep the tape taut and of such shape as to facilitate the penetration of any sludge that might be present on the datum plate of a tank. Also called outage bob.

n: 1. the weight of a fluid (such as water) displaced by a freely floating or submerged body (such as an offshore drilling rig). If the body floats, the displacement equals the weight of the body. 2. replacement of one fluid by another in the pore space of a reservoir. For example, oil may be displaced by water.

n: the mass of fluid displaced by substance floating or sinking in the fluid

n: a type of drill collar with big and heavy circular weighting block to increase the drilling pressure