دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a conglomerate rock composed largely of angular fragments greater than 0.08 inch (2 millimetres) in diameter.

fragmented (not wear rounded) grains. Rock along moving faults may have this texture.

n: I. a term used for particles smaller than \1156 millimetre (4 microns) in size, regardless of mineral composition. 2. a group of hydrous aluminum silicate minerals (clay minerals). 3. a sediment of fine clastics.

n: (1) A soft, variously colored earth, commonly hydrous silicates of alumina, formed by the decomposition of feldspar and other aluminum silicates. Clay minerals are essentially insoluble in water but disperse under hydration, grinding, or velocity effects.

a fine grain (<0.00015” or about 4 microns) – finely crystalline silica sheet minerals. Usually of silicate composition. In oil field terms, the most common clays are Smectite (montmorillinite),illite, kaolinite and chlorite. The characteristic for autho

n: in tank sampling, a spot sample taken 4 inches (100 millimetres) below the level of the tank outlet.

n: a sedimentary rock composed of pebbles of various sizes held together by a cementing material such as clay. Conglomerates are similar to sandstone but are composed mostly of grains more than 2 millimetres (0.08 inch) in diameter. Most conglomerates are found in discontinuous, thin, isolated layers;they are not very abundant. In common usage, the term conglomerate" is restricted to coarse sedimentary rock with rounded grains;conglomerates made up of sharp, angular fragments are called breccia.

poorly sorted collection of sediments, generally formed in a very high energy environment. Similar to sandstones but have much larger grains (pebbles grade 4 to 64 mm). The space between the grains may be partly or completely filled with sand grains.

n pI: slips for drill pipe that fit into the tapered insert bowl of a four-pin master bushing and whose taper length is 12� inches (324 millimetres) long. Compare long rotary slips. See also master bushing, slips.

n: 1. compacted solid or semisolid material remaining on a filter after pressure filtration of mud with a standard filter press. Thickness of the cake is reported in thirty seconds of an inch or in millimetres. 2. the layer of concentrated solids from the drilling mud or cement slurry that forms on the walls of the borehole opposite premeable formations;also called wall cake or mud cake.

n: (1) The soild residue deposited by a drilling fluid against a porous medium, usually filter paper, according to the standard API filtration test. (2) The soild residue deposited on the wall of a borehole during the drilling of permeable formations.


the layer of solids stranded on the face of permeable formations by liquids driven into the rock by pressure differential towards the formation. When sized correctly the filter cake may completely stop losses.

n: a scale for measuring small increases or decreases in pressure. usually in conjunction with a manometer, a U-tube containing mercury. Pressure on one side of the U-tube causes the mercury to move upward on the other side. The movement is measured in inches or millimetres. See manometer.

n: a scale for measuring small increases or decreases in pressure, usually in conjunction with a manometer, a U-tube containing water. Pressure on one side of the U-tube causes the water to move upward on the other side. The movement is measured in inches or milli- metres. See manometer.

n: (L) a unit of metric measure of capacity equal to the volume occupied by 1 kilogram of water at 4.C and at the standard atmospheric pressure of 760 millimetres.

n pi: slips designed to fit a square-drive master bushing, and whose taper length is 8/

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