دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the part of a groove on the drawworks drum that changes direction. Grooves run parallel to each other, except in the angle-control section, where each groove is machined at a slight angle. This angled part of the groove causes the wire rope being spooled onto the drum to change direction so that the next wrap of rope on the drum lies in between the wraps of rope already on the drum. Also called a crossover section.

n: R-SO3-M (R is alkyl, M is cation),a kind of anionic surface active agent, mainly used as foaming agent of foam drilling fluid, for example alkane sulfonate.

abbr: a trademark name for an annular pressure-responsive valve for a DST string.

annular pressure relief valve. Used in reverse circulating to prevent pipe collapse.

n: an asphalt-base enamel applied as a coating to pipe that is to be buried. The asphalt is combined with finely ground mica, clay, soapstone, or talc and applied while hot. Combined with a subsequent wrapping, this coating protects the buried pipe from corrosion.

system 11: a type of tap sampling system found on liquid storage tanks. The permanently installed taps on the out- side of the tank are attached to pipes and a floating boom inside the tank that rises and falls with the liquid level.

n: The diameter of the drilled wellbore. The borehole diameter can change greatly even the same bit due to the change of formation lithology and formation collapse.

a low to moderate strength centralizer formed by arched spring-like straps of metal.