دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: drilling in which the size of the hole is smaller than the conventional hole diameter for a given depth. This decrease in hole size enables the operator to run smaller casing, thereby lessening the cost of completion. See miniaturized completion.

n: by current industry definition, is one where the well is TDd in 4 1/2 or smaller hole size. Slim hole drilling brings significant cost and enviromental benefits but makes well control more diffcult due to the high ECDs and small annular capacities.

n: a hygrometer, or psychrometer, attached to a handle and chain cord, which is whirled rapidly through the air. It also has two thermometers. The bulb of one is kept wet so that the cooling that results from evaporation as the thermometers are whirled makes it register a lower temperature than the dry one. The difference between the dry and wet readings is a measure of the relative humidity of the atmosphere. See psychrometer.

n: a procedure to ensure that the drilling line wears evenly throughout its life. After a specified number of ton-miles (mega joules) of use, the line is slipped-i.e., the traveling block is suspended in the derrick or propped on the rig floor so that it cannot move, the dead- line anchor bolts are loosened, and the drilling line is spooled onto the drawworks drum. Enough line is slipped to change the major points of wear on the line, such as where it passes through the sheaves. To pre- vent excess line from accumulating on the drawworks drum, the worn line is cut off and discarded.

v: the partial or complete collapse of the walls of a hole resulting from incompetent, unconsolidated formations, high angle or repose and wetting along internal bedding planes. See also heaving and cave-in.

(pronounced sluffing") n: see caving.

n: the partial or complete collapse of the walls of a hole resulting from incompetent, unconsolidated formations, high angle or repose and wetting along internal bedding planes. See also heaving and cave-in.

n: 1. a tarlike substance that is formed when oil oxidizes. 2. a highly viscous mixture of oil, water, sediment, and residue.

n: The silt and warp deposited in the tank bottom.




a very viscous, usually solids stabilized emulsion. Often triggered by ferric iron and an asphaltenic oil after an acid job.

n: a quantity of fluid injected into a reservoir to accomplish a specific purpose, such as chemical displacement of oil.

n: a heave,viscous quantity of mud that is pump into the drill string prior to pulling out.the slug will cause the level of fluid in the pipe to fall,thus eliminating the loss of mud on the rig floor when connections are broken.

a volume of gas or liquids that moves through the well and the production facility. A well that flows alternating volumes of water and gas is slugging.

n: A multiphase-fluid flow regime characterized by a series of liquid plugs (slugs) separated by a relatively large gas pockets. In vertical flow, the bubble is an axially symmetrical bullet shape that occupies almost the entire cross-sectional area of the t

flow of distinct volumes of gas and liquid, often signaling unstable behavior.

n: a prover with a volume between detectors that does not permit a minimum accumulation of 1,000 direct (unaltered) pulses from the meter. Small-volume provers require meter pulse discrimination by pulse interpolation counter or other techniques to increase the resolution.