دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a method for killing well pressure in which circulation is commenced immediately and mud weight is brought up in steps, or increments, usually a point at a time. Also called circulate- andweight method.

n: See circulate-and-weight method.

a well pressure control operation in which circulation is started immediately and mud density is brought up in steps until the well has been completely circulated to the kill weight fluid.

n: One of optimization method of drilling. Find the optimal drilling arrangement by changing bit load and keep rotate speed.

n: the pressure at a given temperature for a hydrocarbon system of fixed composition at which the vapourliquid equilibrium values of the various components in the system become or tend to become unified. The convergence pressure is used to adjust vapour-liquid equilibrium values to the particular system under consideration. conversion n: the change in the chemistry of a mud from one type to another. Reasons for making a conversion may be (1) to maintain a stable well bore, (2) to provide a mud that will tolerate higher weight, or density, (3) to drill soluble formations, or (4) to protect producing zones. Also called a breakover.

n: the effect of counterweights on a beam pumping unit. The approximate ideal counterbalance effect is equal to half the weight of the fluid plus the buoyant weight of the rods.

n: a weight applied to compensate for existing weight or force. On pumping units in oil production, counterweights are used to offset the weight of the column of sucker rods and fluid on the upstroke of the pump, and the weight of the rods on the downstroke.

the rotating weights on a beam lift pump jack that offset the weight of the rod string.

n: the placing of a weight on a mechanism to restore it to equilibrium, or balance.

n: see counterbalance weight.

n: a beam pumping unit that has the counterbalance weight on the crank arm.