دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (Ac) a white or gray midlevel cloud that appears as closely arranged rolls. This type of cloud is composed of either ice crystals or water droplets.

n: a bluish or gravish layer of uniform mid-level clouds that cover large portions of the sky. This type of cloud is composed of either ice crystals or water droplets.

n: (NH4)2HPO4, white crystalline material. Usually used as mud thinner of drilling fluid and shale inhibiter.

without crystal form.

n: finely crystalline, generally lightcoloured extrusive igneous rock com- posed largely of plagioclase feldspar with smaller amounts of dark-coloured minerals. Compare diorite.

n: the common name for anhydrous calcium sulphate. caSﾰ4.

n: The main component is calcium sulphate which has no crystal water. The formation which contains this gypse is very usual in drilling and it can contaminate the fresh water drilling fluid. This formation swells when the drilling fluid go through it and som

CaSO4 formation. Usually formed as an evaporite from a drying lake of trapped sea water.

chemicals which prevent hydrate crystals from sticking together and forming a larger mass.

n: The commercial artificial diamond. It is a ball composed by more or least radiated slender crystal of diamond. There is no obvious cleavage face. It has high abrasion resistance and mainly is used for manufacturing diamond tool.

n: the cutting or boring element used in drilling oil and gas wells. The bit consists of a cutting element and a circulating element. The cutting element is steel teeth, tungsten carbide buttons, industrial diamonds, or polycrystalline diamonds (PDCs). The circulating element permits the passage of drilling fluid and utilises the hydraulic force of the fluid stream to improve drilling rates. In rotary drilling, several drill collars are joined to the bottom end of the drill pipe column, and the bit is attached to the end of the drill collars.

a drill bit, commonly either a roller cone, button bit, PDC, diamond or drag bit, used with a rotary string or a mud motor to drill through rock.

n: The distance between some layer of crystal and next layer of crystal in clay mineral.