دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a short-time backpressure test for low-permeability reservoirs that otherwise require excessively long times for pressure stabilisation when wells are shut in.

a multi-rate drawdown and build-up test with different drawdowns of the same duration but buildups reaching stabilization.

n: in petroleum refining, the process of altering the arrangement of the atoms in the molecule without adding or removing anything from the original material. Straight-chain hydrocarbons are converted to branched-chain hydrocarbons with a substantially higher octane rating in the presence of a catalyst at moderate temperatures and pressures. The process is basic to the conversion of normal butene into isobutane.

n: the net surface tension of salt solutions first decreases with an increase of concentration, passes through a minimum, and then increases as the concentration is raised.

the intersection of the lateral and the mother-bore when two or more laterals are drilled in a multilateral well, or when a single kick-off lateral is drilled from a vertical well. The junction may be unsealed or sealed and may or may not hold pressure.

n: the mill that built up welding hard metal or special harden meterial,its cutting face is coarse and to mill the debris of metal or other meterial.

abbr: kilovolt.

n: CaO, a kinds of drilling fluid coagulant or depressant of inorganic salt .

potassium chloride salt.

n: 1. a hook-shaped wrench that fits the square shoulder of a sucker rod and is used when rods are pulled or run into a pumping oilwell. Usually used in pairs;one key backs up and the other breaks out or makes up the rod. Also called a rod wrench. 2. a slender strip of metal that is used to fasten a wheel or a gear onto a shaft. The key fits into slots in the shaft and in the wheel or gear. v: to use a cotter key to prevent a nut from coming loose from a bolt or a stud.

n: 1. an undergauge channel or groove cut in the side of the bore- hole and parallel to the axis of the hole. A key seat results from the rotation of pipe on a sharp bend in the hole. 2. a groove cut parallel to the axis in a shaft or a pulley bore.

a out of round bore hole worn to the side, often with the side of the drill pipe in a crooked hole, that looks like a key hole. Keyseats create problems with passage of tool joints and larger pipe that does not bend as easily as smaller diameter pipe.