دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a characteristic sedimentary deposit of the continental rise, formed by a turbidity current and composed of clay, silt, and gravel with the clay on top. See turbidity current.

n: a dense mass of sediment-laden water that flows down the continental slope, typically through a submarine canyon. It carries clay, silt, and gravel quickly and turbulently downslope in a narrow tongue. When it reaches the more gradual slope of the continental rise, its energy is dissipated rapidly by friction, and the sediments settle out, largest particles first, to form a thick graded bed called a turbidite.

n: a downhole motor that rotates a bit by the action of the drilling mud on turbine blades built into the tool. When a turbodrill is used, rotary motion is imparted only at the bit;therefore, it is unnecessary to rotate the drill stem. Although straight holes can be drilled with the tool, it is used most often in directional drilling.

n: The dynamic drill that driving the turbine turn by drill fluid.

n: We usually fix a filter in the first drill pipe under the kelly bar when use turbodrill,which prevent the raffle in the drill fluid blinding the channel.

n: the erratic, nonlinear flow of a fluid, caused by high velocity. Characterized by random eddying flow patterns superimposed on the general flow progressing in a given direction.

n: A type of fluid flow characterized by swirling or chaotic motion as the fluid moves along the flow path. This is a preferred flow regime for mud removal during primary cementing because it is perceived to result in better removal of mud, especially of mud

non laminar flow, usually above a Reynolds number of about 3000. The Blasius equation estimates the friction factor for NRe values less than 100,000 as fB = 0.0791 / NRe0.25.

n: Two same diesels work simultaneously to propel hoist of rig.

n: a complete break in pipe caused by metal fatigue. v: to break something in two or to break apart, such as the head of a bolt or the drill stem.

v: Of drill pipe or drill collars,to part or split primarily because of metal fatigue.

n: Its achieved by fixing a fractional collar at the designed position of casing,which usually be used in deep well cementing .

n: A kind of U-shape bolt,which have thread at two end ,usually be used to chuck the wire rope.

ultrasonic borehole imager.