دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a measure of heat energy equivalent to the amount of heat needed to raise 1 pound of water 1ﾰF at or near its point of maximum density (39.1ﾰF). Equivalent to 0.252 kilogram- calorie or 1,055 joules.

British Thermal Unit.

n: a bucket of water into which air from the drill stem is blown through a hose during the first low period of a drill stem test. In drill stem testing, the flow into the bubble bucket is an easy way to judge flow and shut-in periods.

n: a metal cap, mounted on a tray, that has openings allowing vapour bubbles in a gas-processing tower to contact cool liquids, causing some of the vapour to condense to liquid.

n: a special well-control tool made up in the drill pipe usually just above bubble, of gas enter the annulus, the bubble chopper allows mud in the drill string to be diverted into the gas bubble by means of an opening, or port, in the tool. The mud from the drill string mixes with and spreads out the large gas bubble so that the gas cannot expand to a great extent as it nears the surface. Reducing the amount of bubble expansion reduces pressure on the casing near the surface and thus minimises the chances of formation fracture and an underground blowout.

n: A kind of brassboard method for controlling gas overflowing. When gas overflowing leading to underground blowout happens, an actuator will be threw into the drill column to open side opening of diverter valve.

n: 1. the temperature and pressure at which part of a liquid begins to convert to gas. For example, if a certain volume of liquid is held at constant pressure, but its temperature is increased, a point is reached when bubbles of gas be- gin to form in the liquid. That is the bubble point. Similarly, if a certain volume of liquid is held at a constant temperature but the pressure is reduced, the point at which gas begins to form is the bubble point. Compare dew point. 2. the temperature and pressure at which gas, held in solution in crude oil, breaks out of solution as free gas.

the pressure at which gas begins to break out of an under saturated oil and form a free gas phase in the matrix or a gas cap.

n: a vertical cylindrical vessel in which bubble caps and bubble-cap trays are arranged.

n: see bubble-cap tray.