دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: on a diesel engine, the rackand- pinion gear that allows the engine operator to regulate the amount of fuel the injector forces into the combustion chamber of the engine. See rack-and-pinion gear. control valve n: a valve designed to regulate the flow or pressure of a fluid.

n: A set of adjustable and controllable variables for building mathematical model of drilling in optimized drilling technology.

n: a method for completing a well in which tubing is set inside 4.5-inch (1.4-centimetre) or larger casing. Compare miniaturised completion. conventional coupling n: piping configuration that uses ten diameters of straight full pipe upstream of a meter and straightening vanes;the downstream contains five or more full pipe diameters.

n: A kind of well completion that oil tube is tripped in above the casing whose diameter is 4 1/2.

n: a tank of a shape commonly used in the petroleum industry. It is not constructed to withstand any appreciable pressure or vacuum in the vapour space;it may, therefore, be gauged directly through an open hatch.

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: a device for changing alternating current to direct current or vice versa;usually, if the device changes AC to DC, it is called a rectifier.

n: a tropical cyclone in Mexico. core n: 1. a cylindrical sample taken from a formation for geological analysis. 2. the metallic, partly solid, and partly molten interior of the earth, about 4,400 miles (7,084 kilometres) in diameter. 3. the central, axial member of a wire rope around which the strands are laid. v: to obtain a solid, cylindrical formation sample for analysis. See radiator core.

n pi: see captive customers. core cutter head n: the cutting element of the core barrel assembly. In design it corresponds to one of the three main types of bits: drag bits with blades for cutting soft formations;roller bits with rotating cutters for cutting medium-hard formations;and diamond bits for cutting very hard formations.

n: the process of cutting a vertical, cylindrical sample of the formations encountered as an oilwell is drilled. The purpose of coring is to obtain rock samples, or cores, in such a manner that the rock retains the same properties that it had before it was removed from the formation.

n: The act of producing a sample of the formation being drilled for geological information purposes. Conventional coring is done by means of a core barrel put on the bottom of the drill pipe where the bit normally operates. As the cutter head of the core bar